Price acutherm TF Series User manual

v001 –Issue Date: 09/22/22
© 2022 Acutherm. All rights reserved.
MANUAL – INSTALLATION, BALANCING + MAINTENANCE
THERMA-FUSER
TF Series

acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
THERMA-FUSER - Manual | acutherm.com
TABLE OF CONTENTS
Installation Instructions.................................................. 1
Balancing ..................................................................... 3
Adjusting Temperature .................................................. 5
Blow Patterns (TF-C, TF-CW, and TF-HC) .................... 6
Maintenance................................................................. 7
Controlling the System.................................................. 6
Trouble Shooting (TF-C, TF-CW, and TF-HC) ................ 8
Ten Year Warranty....................................................... 10

1
acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
INSTALLATION INSTRUCTIONS
Damaged Freight Claim Procedure
When the diffusers are received, inspect for damage which
may have occured during shipment. If damage is evident, it
should be noted on the carrier's freight bill. A written request
for inspection by the carrier's agent should be made at once.
Storage
Cartons should always be stacked on end with the arrows
on the cartons pointing up. Do not stack cartons flat on the
sides. Excessive weight may cause damage to the diffusers.
Do not store for prolonged times at temperatures exceeding
130°F/56°C.
Identification
Diffusers are factory shipped one per carton. The model
designation is on the diffuser and on the carton.
FIG. 1 DIMENSIONS TF-C, TF-CW, TF-HC, TF-D AND TF-RA
Installation Precautions
When installing diffusers, make sure construction debris does not enter the diffuser or duct system.
Because the models TF-C, TF-CW and TF-HC control room temperature by sensing the room air induced up the center of the
room, care should be taken not to disturb room air induction and entrainment. For example, location next to walls or dropped
lights results in the reflection of primary air back at the Therma- Fuser diffuser and should be avoided. A three-way blow Therma-
Fuser diffuser should be used in this instance if either the light or the Therma-Fuser diffuser cannot be relocated.
Installation Instructions
1. Inspect the carton for damage before opening. Notify carrier if external damage exists. Submit all claims for shipping damage
to the carrier.
2. Move diffusers (in cartons) to installation area. Note unit identification.
3. Remove cardboard box and cardboard insert. Discard packing material.
4. If other than 4 way blow pattern is factory installed, note the "AIRFLOW" markings on the top of the diffuser and locate those
sides in the proper direction.
5. Install in ceiling grid. Install T-bar support wire close to each corner of diffuser. Make sure that only wire suspended T-bars are
used to support diffuser weight. (Adaptor frames are available for other than lay in ceilings.)
6. Connect and secure the supply duct to the collar. Flexible duct should NOT be formed in a centerline radius of less than 1½
times the duct diameter. Improper installation may result in different performance from published ratings.
7. Do NOT reset the temperature set point on the TF-C, TF-CW and TF-HC models until the space is occupied. It is factory
preset for average conditions (74°F/23°C).
8. Balance the system. See Balancing.
9. After the air conditioning system is started and after the space is occupied, where necessary adjust the temperature set
point on TF-C, TF-CW and TF-HC models to suit the occupant. See Adjusting Temperature.
Operating Instructions
Operating instructions for models TF-C, TF-CW and TF-HC are located on the back of the appearance panel.
Inlet
Designation
OD
Inches
±1/16
mm
±3
6 515/16 150
8 715/16 200
10 915/16 250
12 1115/16 300
THERMA-FUSER
™
THERMALLY POWERED VAV DIFFUSER
IINNSSTTAALLLLAATTIIOONN,,BBAALLAANNCCIINNGG&&MMAAIINNTTEENNAANNCCEE
FORM 12.2 REV 1704
MODULAR VAV SYSTEMS
Models:  TF-C  VAV cooling only.
TF-CW  VAV cooling and warm up heating.
TF-HC VAV cooling and VAV heating.
TF-D Manually adjustable blades.
TF-RA Return air.
 (See Fig. 1 for dimensions.)
DAMAGED FREIGHT CLAIM PROCEDURE
When the diffusers are received, inspect for damage which may
have occured during shipment. If damage is evident, it should be
noted on the carrier's freight bill. A written request for inspection
by the carrier's agent should be made at once.
STORAGE
Cartons should always be stacked on end with the arrows on the
cartons pointing up. Do not stack cartons flat on the sides.
Excessive weight may cause damage to the diffusers.
Do not store for prolonged times at temperatures exceeding
130°F/56°C.
IDENTIFICATION
Diffusers are factory shipped one per carton. The model designa-
tion is on the diffuser and on the carton.
INSTALLATION PRECAUTIONS
When installing diffusers, make sure construction debris does not
enter the diffuser or duct system.
Because the models TF-C, TF-CW and TF-HC control room tem-
perature by sensing the room air induced up the center of the
room, care should be taken not to disturb room air induction and
entrainment. For example, location next to walls or dropped
lights results in the reflection of primary air back at the Therma-
Fuser diffuser and should be avoided. A three-way blow Therma-
Fuser diffuser should be used in this instance if either the light or
the Therma-Fuser diffuser cannot be relocated.
INSTALLATION INSTRUCTIONS
1. Inspect the carton for damage before opening. Notify carrier if
external damage exists. Submit all claims for shipping damage
to the carrier.
2. Move diffusers (in cartons) to installation area. Note unit iden-
tification.
3. Remove cardboard box and cardboard insert. Discard packing
material.
4. If other than 4 way blow pattern is factory installed, note the
"AIRFLOW" markings on the top of the diffuser and locate
those sides in the proper direction.
5. Install in ceiling grid. Install T-bar support wire close to each
corner of diffuser. Make sure that only wire suspended T-bars
are used to support diffuser weight. (Adaptor frames are avail-
able for other than lay in ceilings.)
6. Connect and secure the supply duct to the collar. Flexible duct
should NOT be formed in a centerline radius of less than 1½
times the duct diameter. Improper installation may result in
different performance from published ratings.
7. Do NOT reset the temperature set point on the TF-C, TF-CW
and TF-HC models until the space is occupied. It is factory
preset for average conditions (74°F/23°C).
8. Balance the system. See Balancing.
9. After the air conditioning system is started and after the space
is occupied, where necessary adjust the temperature set point
on TF-C, TF-CW and TF-HC models to suit the occupant. See
Adjusting Temperature.
OPERATING INSTRUCTIONS
Operating instructions for models TF-C, TF-CW and TF-HC are
located on the back of the appearance panel.
OPENING THE APPEARANCE PANEL
(TF-C, TF-CW, TF-HC, TF-D)
The appearance panel is attached with a latch clip on one side
and hinges on the opposite side.
To open the appearance panel (on a Therma-Fuser diffuser
installed in the ceiling):
1. Locate the side of the Therma-Fuser diffuser with the thermo-
stat(s). Using two hands, one on each side of the latch clip
bracket, place your fingers above the appearance panel and
firmly pull down to disengage the clip. The appearance panel
will rotate and hang down vertically on the hinges.
To close the appearance panel:
1. Rotate the panel upward.
2. Latch the panel by pushing the clip into the small square hole
in the bracket.
NECK SECTION
*595±2mm Square with 16±2mm lip available—specify 595mm square.
Fig 1. Dimensions TF-C, TF-CW, TF-HC, TF-D and TF-RA
Inlet
Desig-
nation
6
8
10
12
OD
Inches
±
1
/ 16
5
15
/ 16
7
15
/ 16
9
15
/ 16
11
15
/ 16
mm
±3
150
200
250
300
TABLE OF CONTENTS
Installation Instructions . . . . . . . . . . . . . . . . . . 1
Balancing (TF-C, TF-CW and TF-HC) . . . . . . .  2
Balancing (TF-D). . . . . . . . . . . . . . . . . . . . . . . . .  2
Adjusting Temperature . . . . . . . . . . . . . . . . . . .  2
Blow Patterns (TF-C, TF-CW, and TF-HC) . . .  3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
Trouble Shooting (TF-C, TF-CW, and TF-HC). 4
Ten Year Warranty. . . . . . . . . . . . . . . . . . . . . . .  4
Continued on next page
*595±2MM SQUARE WITH 16±2MM LIP AVAILABLE—SPECIFY 595MM SQUARE.

2acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
INSTALLATION INSTRUCTIONS
THERMA-FUSER - Manual | acutherm.com
Opening the Appearance Panel (TF-C, TF-CW, TF-HC, TF-D)
The appearance panel is attached with a latch clip on one side and hinges on the opposite side.
To open the appearance panel (on a Therma-Fuser diffuser installed in the ceiling):
1. Locate the side of the Therma-Fuser diffuser with the thermostat(s). Using two hands, one on each side of the latch clip
bracket, place your fingers above the appearance panel and firmly pull down to disengage the clip. The appearance panel will
rotate and hang down vertically on the hinges.
To close the appearance panel:
1. Rotate the panel upward.
2. Latch the panel by pushing the clip into the small square hole in the bracket.
To remove the appearance panel:
1. Open appearance panel as described above.
2. Rotate the appearance panel away from the latch clip bracket to force the hinge hooks open on the panel.
3. Slightly lift the panel to remove from the hinges.
To reattach the appearance panel:
1 Hang the appearance panel on the hinges.
2. Press the hinge hooks against the panel to close around the hinge brackets.
3. Close panel as describe above.

3
acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
BALANCING (TF-C, TF-CW AND TF-HC)
VAV systems are balanced for design air volume at maximum
air flow and systems using Therma-Fuser VAV diffusers are
no exception.When all the Therma-Fuser diffusers are set for
maximum air flow by fully opening them, the system is really
a constant air volume system and is balanced as a constant
volume system. Balancing dampers are best located at the
takeoff before the runout to the Therma-Fuser diffuser.
1. Prepare system for balancing. (Make necessary checks
for diversity, fan capacities, fan rotation, miminum outside
air requirements, duct leaks and static pressure controller
design setting. Set outside air control damper for minimum
air and return air control damper for maximum air.)
2. Open Therma-Fuser diffusers.
a. Open appearance panel.
b. Unhook tension spring from bracket adjacent to
cooling thermostat. See Fig. 2.
c. If perimeter blades do not immediately drop to open
position, turn the control plate slightly until they open.
d. Close appearance panel.
NOTE: If the Therma-Fuser diffuser is equipped with a R-Ring
(Ceiling plenum relief ring) do not disconnect the spring. Use
temporary balancing stops made of wood supplied with
the diffuser to hold the blades open the proper distance for
balancing. Thickness of the stop will depend on the size of the
R-Ring used.
3. Start fans, adjust system for 100% air flow and make
system checks. (Measure static pressure across filters and
coils and at sensor for static pressure controller. Measure
supply, return and branch duct air flow.)
4. Place a direct reading diffuser balancing hood over the
face of each Therma-Fuser diffuser and adjust damper at
duct takeoff to obtain maximum design air volume.
5. Return Therma-Fuser diffusers to operating condition.
a. Open appearance panel.
b. Attach tension spring to bracket (removed in step 2b).
c. Close appearance panel.
6. Return the remainder of the system to operating condition.
BALANCING
FIG. 2 REMOVE SPRING TO DROP BLADES OPEN FOR BALANCING
Fig. 3 Measuring blade opening
Recommended
Action
Adjust cooling for higher room temperature set point.
(Screw cooling thermostat out.)
Therma-Fuser diffuser is correct. Check if cooling is
still required, and if not, turn cooling unit off.
Therma-Fuser diffuser is correct. Check for lack of
air or for too warm air temperature.
Adjust cooling thermostat for lower room tempera-
ture set point. (Screw cooling thermostat in.)
Therma-Fuser diffuser is correct. Check for lack of
air or too low air temperature.
Adjust heating thermostat for higher room tempera-
ture set point. (Screw heating thermostat out.)
Adjust heating thermostat for lower room tempera-
ture set point. (Screw heating thermostat in.)
Therma-Fuser diffuser is correct. Check if heating is
still required, and if not, turn it off.
Reduce static pressure. Recommended static pres-
sure is .05 to .25 wg / 10 to 60 Pa at the inlet of the
diffuser. If lower noise level does not result from
lower static pressure, check for and correct noise
generating restrictions in the duct up stream such as
large pressure drops over dampers, heaters, etc.
Blade
Position
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Any
Room
Temp.
Too
Cold

Too
Warm

Too
Cold

Too
Warm

Any
Cooling
Mode

TF-C
TF-CW
TF-HC

Heating
Mode

TF-HC

Too
Noisy
TF-C
TF-CW
TF-HC
TF-D
RECOMMENDED ADJUSTMENTS FOR
VARIOUS CONDITIONS
Fig. 4 Room temperature set point adjustment
To remove the appearance panel:
1. Open appearance panel as described above.
2. Rotate the appearance panel away from the latch clip bracket
to force the hinge hooks open on the panel.
3. Slightly lift the panel to remove from the hinges.
To reattach the appearance panel:
1. Hang the appearance panel on the hinges.
2. Press the hinge hooks against the panel to close around the
hinge brackets.
3. Close panel as describe above.
BALANCING (TF-C, TF-CW AND TF-HC)
VAV systems are balanced for design air volume at maximum air
flow and systems using Therma-Fuser VAV diffusers are no
exception.When all the Therma-Fuser diffusers are set for maxi-
mum air flow by fully opening them, the system is really a con-
stant air volume system and is balanced as a constant volume
system. Balancing dampers are best located at the takeoff before
the runout to the Therma-Fuser diffuser.
1. Prepare system for balancing. (Make necessary checks for
diversity, fan capacities, fan rotation, miminum outside air
requirements, duct leaks and static pressure controller design
setting. Set outside air control damper for minimum air and
return air control damper for maximum air.)
2. Open Therma-Fuser diffusers.
a. Open appearance panel.
b. Unhook tension spring from bracket adjacent to cooling
thermostat. See Fig. 2.
c. If perimeter blades do not immediately drop to open posi-
tion, turn the control plate slightly until they open.
d. Close appearance panel.
Note: If the Therma-Fuser diffuser is equipped with a R-Ring
(Ceiling plenum relief ring) do not disconnect the spring.
Use temporary balancing stops made of wood supplied with
the diffuser to hold the blades open the proper distance for
balancing. Thickness of the stop will depend on the size of
the R-Ring used.
3. Start fans, adjust system for 100% air flow and make system
checks. (Measure static pressure across filters and coils and at
sensor for static pressure controller. Measure supply, return
and branch duct air flow.)
4. Place a direct reading diffuser balancing hood over the face of
each Therma-Fuser diffuser and adjust damper at duct takeoff
to obtain maximum design air volume.
5. Return Therma-Fuser diffusers to operating condition.
a. Open appearance panel.
b. Attach tension spring to bracket (removed in step 2b).
c. Close appearance panel.
BALANCING (TF-D)
1. Measure the blade openings (See Fig. 3) and readjust where
necessary by turning the adjusting screw in the center of each
blade. Recommended initial blade openings are:
Inlet Description  Blade Opening
 6  3/8" – 10mm
 8  1/2" – 13mm
 10  3/4" – 19mm
 12  1-1/8" – 29mm
2. Adjust for proper air volume with the balancing damper at the
duct takeoff. Each blade on the diffuser can also be separately
adjusted. Recommended discharge velocity is 1200 fpm –
6m/sec.
ADJUSTING TEMPERATURE
Room temperature set points are adjusted by screwing the ther-
mostats in or out – in for cooler or out for warmer. Determine the
set point by aligning the white indicator with the °F or °C num-
bers on the temperature scale. (See Fig. 4)
Temperature
set point
indicator
(white)
21
0
C 70
0
F
24
0
C 74
0
F
26
0
C 78
0
F
Control Plate
Screw
Cooling
Thermostat
Shaft
Actuator
Arm
View Port
Fig. 2 Remove spring to drop
blades open for balancing
Remove spring to drop blades open
Foam
Housing
Blade
Small Steel Rule
Page 2
Continued on next page

4acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
THERMA-FUSER - Manual | acutherm.com
BALANCING
FIG. 3 OPEN FOR BALANCING BALANCING (TF-D)
1. Measure the blade openings (See Fig. 3) and readjust
where necessary by turning the adjusting screw in
the center of each blade. Recommended initial blade
openings are:
2. Adjust for proper air volume with the balancing damper at
the duct takeoff. Each blade on the diffuser can also be
separately adjusted. Recommended discharge velocity is
1200 fpm – 6m/sec.
Inlet Description
6
8
10
12
Blade Opening
3
/ 8"– 10mm
½"– 13mm
¾"– 19mm
1-1 / 8"– 29mm
Fig. 3 Measuring blade opening
Recommended
Action
Adjust cooling for higher room temperature set point.
(Screw cooling thermostat out.)
Therma-Fuser diffuser is correct. Check if cooling is
still required, and if not, turn cooling unit off.
Therma-Fuser diffuser is correct. Check for lack of
air or for too warm air temperature.
Adjust cooling thermostat for lower room tempera-
ture set point. (Screw cooling thermostat in.)
Therma-Fuser diffuser is correct. Check for lack of
air or too low air temperature.
Adjust heating thermostat for higher room tempera-
ture set point. (Screw heating thermostat out.)
Adjust heating thermostat for lower room tempera-
ture set point. (Screw heating thermostat in.)
Therma-Fuser diffuser is correct. Check if heating is
still required, and if not, turn it off.
Reduce static pressure. Recommended static pres-
sure is .05 to .25 wg / 10 to 60 Pa at the inlet of the
diffuser. If lower noise level does not result from
lower static pressure, check for and correct noise
generating restrictions in the duct up stream such as
large pressure drops over dampers, heaters, etc.
Blade
Position
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Any
Room
Temp.
Too
Cold

Too
Warm

Too
Cold

Too
Warm

Any
Cooling
Mode

TF-C
TF-CW
TF-HC

Heating
Mode

TF-HC

Too
Noisy
TF-C
TF-CW
TF-HC
TF-D
RECOMMENDED ADJUSTMENTS FOR
VARIOUS CONDITIONS
Fig. 4 Room temperature set point adjustment
To remove the appearance panel:
1. Open appearance panel as described above.
2. Rotate the appearance panel away from the latch clip bracket
to force the hinge hooks open on the panel.
3. Slightly lift the panel to remove from the hinges.
To reattach the appearance panel:
1. Hang the appearance panel on the hinges.
2. Press the hinge hooks against the panel to close around the
hinge brackets.
3. Close panel as describe above.
BALANCING (TF-C, TF-CW AND TF-HC)
VAV systems are balanced for design air volume at maximum air
flow and systems using Therma-Fuser VAV diffusers are no
exception.When all the Therma-Fuser diffusers are set for maxi-
mum air flow by fully opening them, the system is really a con-
stant air volume system and is balanced as a constant volume
system. Balancing dampers are best located at the takeoff before
the runout to the Therma-Fuser diffuser.
1. Prepare system for balancing. (Make necessary checks for
diversity, fan capacities, fan rotation, miminum outside air
requirements, duct leaks and static pressure controller design
setting. Set outside air control damper for minimum air and
return air control damper for maximum air.)
2. Open Therma-Fuser diffusers.
a. Open appearance panel.
b. Unhook tension spring from bracket adjacent to cooling
thermostat. See Fig. 2.
c. If perimeter blades do not immediately drop to open posi-
tion, turn the control plate slightly until they open.
d. Close appearance panel.
Note: If the Therma-Fuser diffuser is equipped with a R-Ring
(Ceiling plenum relief ring) do not disconnect the spring.
Use temporary balancing stops made of wood supplied with
the diffuser to hold the blades open the proper distance for
balancing. Thickness of the stop will depend on the size of
the R-Ring used.
3. Start fans, adjust system for 100% air flow and make system
checks. (Measure static pressure across filters and coils and at
sensor for static pressure controller. Measure supply, return
and branch duct air flow.)
4. Place a direct reading diffuser balancing hood over the face of
each Therma-Fuser diffuser and adjust damper at duct takeoff
to obtain maximum design air volume.
5. Return Therma-Fuser diffusers to operating condition.
a. Open appearance panel.
b. Attach tension spring to bracket (removed in step 2b).
c. Close appearance panel.
BALANCING (TF-D)
1. Measure the blade openings (See Fig. 3) and readjust where
necessary by turning the adjusting screw in the center of each
blade. Recommended initial blade openings are:
Inlet Description  Blade Opening
 6  3/8" – 10mm
 8  1/2" – 13mm
 10  3/4" – 19mm
 12  1-1/8" – 29mm
2. Adjust for proper air volume with the balancing damper at the
duct takeoff. Each blade on the diffuser can also be separately
adjusted. Recommended discharge velocity is 1200 fpm –
6m/sec.
ADJUSTING TEMPERATURE
Room temperature set points are adjusted by screwing the ther-
mostats in or out – in for cooler or out for warmer. Determine the
set point by aligning the white indicator with the °F or °C num-
bers on the temperature scale. (See Fig. 4)
Temperature
set point
indicator
(white)
21
0
C 70
0
F
24
0
C 74
0
F
26
0
C 78
0
F
Control Plate
Screw
Cooling
Thermostat
Shaft
Actuator
Arm
View Port
Fig. 2 Remove spring to drop
blades open for balancing
Remove spring to drop blades open
Foam
Housing
Blade
Small Steel Rule
Page 2
Continued on next page

5
acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
Room temperature set points are adjusted by screwing
the thermostats in or out – in for cooler or out for warmer.
Determine the set point by aligning the white indicator with the
°F or °C numbers on the temperature scale. (See Fig. 4)
FIG. 4 ROOM TEMPERATURE SET POINT ADJUSTMENT
ADJUSTING TEMPERATURE
Recommended Adjustments for Various Conditions
ACH SF CFM
Cooling
Mode
STR-C
STR-HC
Too Cold
open Adjust cooling for higher room temperature set point.
(Turn cooling thumbwheel out.)
closed Therma-Fuser diffuser is correct.
Check if cooling is still required, and if not, turn cooling unit off.
Too Warm
open Therma-Fuser diffuser is correct.
Check for lack of air or for too warm air temperature.
closed Adjust cooling for lower room temperature set point.
(Turn cooling thumbwheel in.)
Heating
Mode
ST-HC
Too Cold
open Therma-Fuser diffuser is correct.
Check for lack of air or too low air temperature.
closed Adjust heating for higher room temperature set point.
(Turn heating thumbwheel out.)
Too Warm
open Adjust heating for lower room temperature set point.
(Turn heating thumbwheel in.)
closed Therma-Fuser diffuser is correct.
Check if heating is still required, and if not, turn it off.
Too
Noisy
ST-C
ST-HC
Any Any
Reduce static pressure. Recommended static pressure is .05 to .25
wg / 10 to 62 Pa at the inlet of the diffuser. If lower noise level does
not result from lower static pressure, check for and correct noise
generating restrictions in the duct up stream such as large pressure
drops over dampers, heaters, etc.
The thermostats may be slightly harder to screw in or out when warm because the shaft is extended putting more pressure on the
thermostat. If you are unable to turn the thermostat in this situation, cool the thermostat by holding an ice cube to the large end.
The shaft will then contract and the thermostat will turn easily for adjustment.
For proper operation make sure that the extension shaft on the cooling thermostat is in the actuator arm dimple. Check by sighting
through the control plate viewport. (See Fig. 4) If the shaft is not in the dimple, cool the thermostat by holding ice to the large end
until the shafts retracts and move the shaft into the dimple.
Fig. 3 Measuring blade opening
Recommended
Action
Adjust cooling for higher room temperature set point.
(Screw cooling thermostat out.)
Therma-Fuser diffuser is correct. Check if cooling is
still required, and if not, turn cooling unit off.
Therma-Fuser diffuser is correct. Check for lack of
air or for too warm air temperature.
Adjust cooling thermostat for lower room tempera-
ture set point. (Screw cooling thermostat in.)
Therma-Fuser diffuser is correct. Check for lack of
air or too low air temperature.
Adjust heating thermostat for higher room tempera-
ture set point. (Screw heating thermostat out.)
Adjust heating thermostat for lower room tempera-
ture set point. (Screw heating thermostat in.)
Therma-Fuser diffuser is correct. Check if heating is
still required, and if not, turn it off.
Reduce static pressure. Recommended static pres-
sure is .05 to .25 wg / 10 to 60 Pa at the inlet of the
diffuser. If lower noise level does not result from
lower static pressure, check for and correct noise
generating restrictions in the duct up stream such as
large pressure drops over dampers, heaters, etc.
Blade
Position
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Any
Room
Temp.
Too
Cold

Too
Warm

Too
Cold

Too
Warm

Any
Cooling
Mode

TF-C
TF-CW
TF-HC

Heating
Mode

TF-HC

Too
Noisy
TF-C
TF-CW
TF-HC
TF-D
RECOMMENDED ADJUSTMENTS FOR
VARIOUS CONDITIONS
Fig. 4 Room temperature set point adjustment
To remove the appearance panel:
1. Open appearance panel as described above.
2. Rotate the appearance panel away from the latch clip bracket
to force the hinge hooks open on the panel.
3. Slightly lift the panel to remove from the hinges.
To reattach the appearance panel:
1. Hang the appearance panel on the hinges.
2. Press the hinge hooks against the panel to close around the
hinge brackets.
3. Close panel as describe above.
BALANCING (TF-C, TF-CW AND TF-HC)
VAV systems are balanced for design air volume at maximum air
flow and systems using Therma-Fuser VAV diffusers are no
exception.When all the Therma-Fuser diffusers are set for maxi-
mum air flow by fully opening them, the system is really a con-
stant air volume system and is balanced as a constant volume
system. Balancing dampers are best located at the takeoff before
the runout to the Therma-Fuser diffuser.
1. Prepare system for balancing. (Make necessary checks for
diversity, fan capacities, fan rotation, miminum outside air
requirements, duct leaks and static pressure controller design
setting. Set outside air control damper for minimum air and
return air control damper for maximum air.)
2. Open Therma-Fuser diffusers.
a. Open appearance panel.
b. Unhook tension spring from bracket adjacent to cooling
thermostat. See Fig. 2.
c. If perimeter blades do not immediately drop to open posi-
tion, turn the control plate slightly until they open.
d. Close appearance panel.
Note: If the Therma-Fuser diffuser is equipped with a R-Ring
(Ceiling plenum relief ring) do not disconnect the spring.
Use temporary balancing stops made of wood supplied with
the diffuser to hold the blades open the proper distance for
balancing. Thickness of the stop will depend on the size of
the R-Ring used.
3. Start fans, adjust system for 100% air flow and make system
checks. (Measure static pressure across filters and coils and at
sensor for static pressure controller. Measure supply, return
and branch duct air flow.)
4. Place a direct reading diffuser balancing hood over the face of
each Therma-Fuser diffuser and adjust damper at duct takeoff
to obtain maximum design air volume.
5. Return Therma-Fuser diffusers to operating condition.
a. Open appearance panel.
b. Attach tension spring to bracket (removed in step 2b).
c. Close appearance panel.
BALANCING (TF-D)
1. Measure the blade openings (See Fig. 3) and readjust where
necessary by turning the adjusting screw in the center of each
blade. Recommended initial blade openings are:
Inlet Description  Blade Opening
 6  3/8" – 10mm
 8  1/2" – 13mm
 10  3/4" – 19mm
 12  1-1/8" – 29mm
2. Adjust for proper air volume with the balancing damper at the
duct takeoff. Each blade on the diffuser can also be separately
adjusted. Recommended discharge velocity is 1200 fpm –
6m/sec.
ADJUSTING TEMPERATURE
Room temperature set points are adjusted by screwing the ther-
mostats in or out – in for cooler or out for warmer. Determine the
set point by aligning the white indicator with the °F or °C num-
bers on the temperature scale. (See Fig. 4)
Temperature
set point
indicator
(white)
21
0
C 70
0
F
24
0
C 74
0
F
26
0
C 78
0
F
Control Plate
Screw
Cooling
Thermostat
Shaft
Actuator
Arm
View Port
Fig. 2 Remove spring to drop
blades open for balancing
Remove spring to drop blades open
Foam
Housing
Blade
Small Steel Rule
Page 2
Continued on next page

6acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
THERMA-FUSER - Manual | acutherm.com
BLOW PATTERNS (TF-C, TF-CW, AND TF-HC)
A major selling feature of the TF-C, TF-CW and TF-HC diffusers is the ability to easily
add or remove blow patterns in the field. This is done by blocking the air off behind
the blades on the appropriate sides.
DO NOT:
• Disconnect the spokes.
• Tape, screw or otherwise lock the blade closed. This unbalances the loads on
the center bearings.
• Block the four venturi nozzles.
DO block air flow behind the blades or between the standoffs. (Standoffs are the
supports between the housing and the diffusion plate.) Ways to do this are:
1. Factory installed directional baffles. These are strips of metal wrapped around
the standoffs to block one, two or three sides. These can be removed in the field
after first removing the diffusion plate assembly.
2. Field installed directional baffles. These are trapezoid pieces of metal that are laid
horizontally on top of the corner supports. Dimensions are as shown in Fig. 5.
Directional baffles can be made locally or purchased from Acutherm.
3. 1-5/8" diameter x 10" long (Armaflex) for split system refrigeration lines. Insert
between the housing and the diffusion plate/blade assembly and wedge between
the standoffs (See Fig. 6). Not supplied by Acutherm but easily available in
the field.
The rule for blocking the appropriate side is: Always block the thermostat side. (See
Fig. 7 for examples.)
NOTE: Some earlier TF-C and TF-CW models have one induction slot by the
thermostat instead of four venturi nozzles. The rule for blocking the appropriate side
for this version is: Never block the thermostat side.
When blocking for direction, the air volume for a given static pressure is reduced from
max. air volume listed in the performance guide by:
FIG. 5 FIELD INSTALLED BAFFLE
FIG. 6 FOAM DIRECTIONAL BAFFLE
Blow Patterns
3 way
2 way
1 way
Blade Opening
0.78
0.56
0.34
3-WAY D3 2-WAY D2 OPPOSITE 2-WAY D2C CORNER 1-WAY D1
FIG. 7 BLOW PATTERNS
The thermostats may be slightly harder to screw in or out when
warm because the shaft is extended putting more pressure on the
thermostat. If you are unable to turn the thermostat in this situa-
tion, cool the thermostat by holding an ice cube to the large end.
The shaft will then contract and the thermostat will turn easily for
adjustment.
For proper operation make sure that the extension shaft on the
cooling thermostat is in the actuator arm dimple. Check by sight-
ing through the control plate viewport. (See Fig. 4) If the shaft is
not in the dimple, cool the thermostat by holding ice to the large
end until the shafts retracts and move the shaft into the dimple.
BLOW PATTERNS (TF-C, TF-CW, AND
TF-HC)
A major selling feature of the TF-C, TF-CW and TF-HC diffusers
is the ability to easily add or remove blow patterns in the field.
This is done by blocking the air off behind the blades on the
appropriate sides.
DO NOT:
— Disconnect the spokes.
— Tape, screw or otherwise lock the blade closed. This unbalan-
ces the loads on the center bearings.
— Block the four venturi nozzles.
DO block air flow behind the blades or between the standoffs.
(Standoffs are the supports between the housing and the diffu-
sion plate.) Ways to do this are:
1. Factory installed directional baffles. These are strips of metal
wrapped around the standoffs to block one, two or three sides.
These can be removed in the field after first removing the dif-
fusion plate assembly.
2. Field installed directional baffles. These are trapezoid pieces of
metal that are laid horizontally on top of the corner supports.
Dimensions are as shown in Fig. 5. Directional baffles can be
made locally or purchased from Acutherm.
3. 1-5/8" diameter x 10" long (Armaflex) for split system refrig-
eration lines. Insert between the housing and the diffusion
plate/blade assembly and wedge between the standoffs (See
Fig. 6). Not supplied by Acutherm but easily available in the
field.
The rule for blocking the appropriate side is: Always block the ther-
mostat side. (See Fig. 7 for examples.)
Note: Some earlier TF-C and TF-CW models have one induction
slot by the thermostat instead of four venturi nozzles. The
rule for blocking the appropriate side for this version is:
Never block the thermostat side.
When blocking for direction, the air volume for a given static
pressure is reduced from max. air volume listed in the perform-
ance guide by:
Blow Patterns Reduction
 3 way .78
 2 way .56
 1 way .34
MAINTENANCE
The moving parts of the TF Therma-Fuser diffuser have no main-
tenance or lubrication requirements. We are often asked to rec-
ommend periodic maintenance procedures and a spare parts
stock. Recommended maintenance is to clean the outer surfaces
of the Therma-Fuser diffuser—nothing else. We do not recom-
mend stocking any spare parts. Our customers also confirm that
stocking is unnecessary.
DAMPER BLADE ADJUSTMENT (TF-C,
TF-CW, AND TF-HC)
If one of the blades does not track uniformly with the others,
make a simple field adjustment to the spoke wire which connects
the blade to the control plate. A pair of needle nose pliers or sim-
ilar tool is all that is required. If the blade does not open as rap-
idly as the other blades, insert the pliers inside of the closed
loope in the spoke wire and slightly expand the loop. If the blade
opens more rapidly than the others, place the pliers outside of
the closed loop and slightly compress the loop. No other adjust-
ment is required.
Continued on next page
Fig. 5 Field installed baffle
Fig. 6 Foam directional baffle
87/16" – 214mm
1511/16" – 398mm
3/4"–19mm Dia.
19/16" – 40mm
45° TYP.
Corners Clipped – No Sharp Points
33/4" – 95mm
3/32"
2mm TYP.
3/16" – 1mm TYP.
THERMA-FUSER
DIFFUSER
THERMA-FUSER
DIFFUSER
Directional Baffle
Fig. 7 Blow Patterns
3-Way D3 2-Way D2 Opposite
2-Way D2C Corner 1-Way D1
Page 3
The thermostats may be slightly harder to screw in or out when
warm because the shaft is extended putting more pressure on the
thermostat. If you are unable to turn the thermostat in this situa-
tion, cool the thermostat by holding an ice cube to the large end.
The shaft will then contract and the thermostat will turn easily for
adjustment.
For proper operation make sure that the extension shaft on the
cooling thermostat is in the actuator arm dimple. Check by sight-
ing through the control plate viewport. (See Fig. 4) If the shaft is
not in the dimple, cool the thermostat by holding ice to the large
end until the shafts retracts and move the shaft into the dimple.
BLOW PATTERNS (TF-C, TF-CW, AND
TF-HC)
A major selling feature of the TF-C, TF-CW and TF-HC diffusers
is the ability to easily add or remove blow patterns in the field.
This is done by blocking the air off behind the blades on the
appropriate sides.
DO NOT:
— Disconnect the spokes.
— Tape, screw or otherwise lock the blade closed. This unbalan-
ces the loads on the center bearings.
— Block the four venturi nozzles.
DO block air flow behind the blades or between the standoffs.
(Standoffs are the supports between the housing and the diffu-
sion plate.) Ways to do this are:
1. Factory installed directional baffles. These are strips of metal
wrapped around the standoffs to block one, two or three sides.
These can be removed in the field after first removing the dif-
fusion plate assembly.
2. Field installed directional baffles. These are trapezoid pieces of
metal that are laid horizontally on top of the corner supports.
Dimensions are as shown in Fig. 5. Directional baffles can be
made locally or purchased from Acutherm.
3. 1-5/8" diameter x 10" long (Armaflex) for split system refrig-
eration lines. Insert between the housing and the diffusion
plate/blade assembly and wedge between the standoffs (See
Fig. 6). Not supplied by Acutherm but easily available in the
field.
The rule for blocking the appropriate side is: Always block the ther-
mostat side. (See Fig. 7 for examples.)
Note: Some earlier TF-C and TF-CW models have one induction
slot by the thermostat instead of four venturi nozzles. The
rule for blocking the appropriate side for this version is:
Never block the thermostat side.
When blocking for direction, the air volume for a given static
pressure is reduced from max. air volume listed in the perform-
ance guide by:
Blow Patterns Reduction
 3 way .78
 2 way .56
 1 way .34
MAINTENANCE
The moving parts of the TF Therma-Fuser diffuser have no main-
tenance or lubrication requirements. We are often asked to rec-
ommend periodic maintenance procedures and a spare parts
stock. Recommended maintenance is to clean the outer surfaces
of the Therma-Fuser diffuser—nothing else. We do not recom-
mend stocking any spare parts. Our customers also confirm that
stocking is unnecessary.
DAMPER BLADE ADJUSTMENT (TF-C,
TF-CW, AND TF-HC)
If one of the blades does not track uniformly with the others,
make a simple field adjustment to the spoke wire which connects
the blade to the control plate. A pair of needle nose pliers or sim-
ilar tool is all that is required. If the blade does not open as rap-
idly as the other blades, insert the pliers inside of the closed
loope in the spoke wire and slightly expand the loop. If the blade
opens more rapidly than the others, place the pliers outside of
the closed loop and slightly compress the loop. No other adjust-
ment is required.
Continued on next page
Fig. 5 Field installed baffle
Fig. 6 Foam directional baffle
87/16" – 214mm
1511/16" – 398mm
3/4"–19mm Dia.
19/16" – 40mm
45° TYP.
Corners Clipped – No Sharp Points
33/4" – 95mm
3/32"
2mm TYP.
3/16" – 1mm TYP.
THERMA-FUSER
DIFFUSER
THERMA-FUSER
DIFFUSER
Directional Baffle
Fig. 7 Blow Patterns
3-Way D3 2-Way D2 Opposite
2-Way D2C Corner 1-Way D1
Page 3
The thermostats may be slightly harder to screw in or out when
warm because the shaft is extended putting more pressure on the
thermostat. If you are unable to turn the thermostat in this situa-
tion, cool the thermostat by holding an ice cube to the large end.
The shaft will then contract and the thermostat will turn easily for
adjustment.
For proper operation make sure that the extension shaft on the
cooling thermostat is in the actuator arm dimple. Check by sight-
ing through the control plate viewport. (See Fig. 4) If the shaft is
not in the dimple, cool the thermostat by holding ice to the large
end until the shafts retracts and move the shaft into the dimple.
BLOW PATTERNS (TF-C, TF-CW, AND
TF-HC)
A major selling feature of the TF-C, TF-CW and TF-HC diffusers
is the ability to easily add or remove blow patterns in the field.
This is done by blocking the air off behind the blades on the
appropriate sides.
DO NOT:
— Disconnect the spokes.
— Tape, screw or otherwise lock the blade closed. This unbalan-
ces the loads on the center bearings.
— Block the four venturi nozzles.
DO block air flow behind the blades or between the standoffs.
(Standoffs are the supports between the housing and the diffu-
sion plate.) Ways to do this are:
1. Factory installed directional baffles. These are strips of metal
wrapped around the standoffs to block one, two or three sides.
These can be removed in the field after first removing the dif-
fusion plate assembly.
2. Field installed directional baffles. These are trapezoid pieces of
metal that are laid horizontally on top of the corner supports.
Dimensions are as shown in Fig. 5. Directional baffles can be
made locally or purchased from Acutherm.
3. 1-5/8" diameter x 10" long (Armaflex) for split system refrig-
eration lines. Insert between the housing and the diffusion
plate/blade assembly and wedge between the standoffs (See
Fig. 6). Not supplied by Acutherm but easily available in the
field.
The rule for blocking the appropriate side is: Always block the ther-
mostat side. (See Fig. 7 for examples.)
Note: Some earlier TF-C and TF-CW models have one induction
slot by the thermostat instead of four venturi nozzles. The
rule for blocking the appropriate side for this version is:
Never block the thermostat side.
When blocking for direction, the air volume for a given static
pressure is reduced from max. air volume listed in the perform-
ance guide by:
Blow Patterns Reduction
 3 way .78
 2 way .56
 1 way .34
MAINTENANCE
The moving parts of the TF Therma-Fuser diffuser have no main-
tenance or lubrication requirements. We are often asked to rec-
ommend periodic maintenance procedures and a spare parts
stock. Recommended maintenance is to clean the outer surfaces
of the Therma-Fuser diffuser—nothing else. We do not recom-
mend stocking any spare parts. Our customers also confirm that
stocking is unnecessary.
DAMPER BLADE ADJUSTMENT (TF-C,
TF-CW, AND TF-HC)
If one of the blades does not track uniformly with the others,
make a simple field adjustment to the spoke wire which connects
the blade to the control plate. A pair of needle nose pliers or sim-
ilar tool is all that is required. If the blade does not open as rap-
idly as the other blades, insert the pliers inside of the closed
loope in the spoke wire and slightly expand the loop. If the blade
opens more rapidly than the others, place the pliers outside of
the closed loop and slightly compress the loop. No other adjust-
ment is required.
Continued on next page
Fig. 5 Field installed baffle
Fig. 6 Foam directional baffle
87/16" – 214mm
1511/16" – 398mm
3/4"–19mm Dia.
19/16" – 40mm
45° TYP.
Corners Clipped – No Sharp Points
33/4" – 95mm
3/32"
2mm TYP.
3/16" – 1mm TYP.
THERMA-FUSER
DIFFUSER
THERMA-FUSER
DIFFUSER
Directional Baffle
Fig. 7 Blow Patterns
3-Way D3 2-Way D2 Opposite
2-Way D2C Corner 1-Way D1
Page 3
The thermostats may be slightly harder to screw in or out when
warm because the shaft is extended putting more pressure on the
thermostat. If you are unable to turn the thermostat in this situa-
tion, cool the thermostat by holding an ice cube to the large end.
The shaft will then contract and the thermostat will turn easily for
adjustment.
For proper operation make sure that the extension shaft on the
cooling thermostat is in the actuator arm dimple. Check by sight-
ing through the control plate viewport. (See Fig. 4) If the shaft is
not in the dimple, cool the thermostat by holding ice to the large
end until the shafts retracts and move the shaft into the dimple.
BLOW PATTERNS (TF-C, TF-CW, AND
TF-HC)
A major selling feature of the TF-C, TF-CW and TF-HC diffusers
is the ability to easily add or remove blow patterns in the field.
This is done by blocking the air off behind the blades on the
appropriate sides.
DO NOT:
— Disconnect the spokes.
— Tape, screw or otherwise lock the blade closed. This unbalan-
ces the loads on the center bearings.
— Block the four venturi nozzles.
DO block air flow behind the blades or between the standoffs.
(Standoffs are the supports between the housing and the diffu-
sion plate.) Ways to do this are:
1. Factory installed directional baffles. These are strips of metal
wrapped around the standoffs to block one, two or three sides.
These can be removed in the field after first removing the dif-
fusion plate assembly.
2. Field installed directional baffles. These are trapezoid pieces of
metal that are laid horizontally on top of the corner supports.
Dimensions are as shown in Fig. 5. Directional baffles can be
made locally or purchased from Acutherm.
3. 1-5/8" diameter x 10" long (Armaflex) for split system refrig-
eration lines. Insert between the housing and the diffusion
plate/blade assembly and wedge between the standoffs (See
Fig. 6). Not supplied by Acutherm but easily available in the
field.
The rule for blocking the appropriate side is: Always block the ther-
mostat side. (See Fig. 7 for examples.)
Note: Some earlier TF-C and TF-CW models have one induction
slot by the thermostat instead of four venturi nozzles. The
rule for blocking the appropriate side for this version is:
Never block the thermostat side.
When blocking for direction, the air volume for a given static
pressure is reduced from max. air volume listed in the perform-
ance guide by:
Blow Patterns Reduction
 3 way .78
 2 way .56
 1 way .34
MAINTENANCE
The moving parts of the TF Therma-Fuser diffuser have no main-
tenance or lubrication requirements. We are often asked to rec-
ommend periodic maintenance procedures and a spare parts
stock. Recommended maintenance is to clean the outer surfaces
of the Therma-Fuser diffuser—nothing else. We do not recom-
mend stocking any spare parts. Our customers also confirm that
stocking is unnecessary.
DAMPER BLADE ADJUSTMENT (TF-C,
TF-CW, AND TF-HC)
If one of the blades does not track uniformly with the others,
make a simple field adjustment to the spoke wire which connects
the blade to the control plate. A pair of needle nose pliers or sim-
ilar tool is all that is required. If the blade does not open as rap-
idly as the other blades, insert the pliers inside of the closed
loope in the spoke wire and slightly expand the loop. If the blade
opens more rapidly than the others, place the pliers outside of
the closed loop and slightly compress the loop. No other adjust-
ment is required.
Continued on next page
Fig. 5 Field installed baffle
Fig. 6 Foam directional baffle
87/16" – 214mm
1511/16" – 398mm
3/4"–19mm Dia.
19/16" – 40mm
45° TYP.
Corners Clipped – No Sharp Points
33/4" – 95mm
3/32"
2mm TYP.
3/16" – 1mm TYP.
THERMA-FUSER
DIFFUSER
THERMA-FUSER
DIFFUSER
Directional Baffle
Fig. 7 Blow Patterns
3-Way D3 2-Way D2 Opposite
2-Way D2C Corner 1-Way D1
Page 3
The thermostats may be slightly harder to screw in or out when
warm because the shaft is extended putting more pressure on the
thermostat. If you are unable to turn the thermostat in this situa-
tion, cool the thermostat by holding an ice cube to the large end.
The shaft will then contract and the thermostat will turn easily for
adjustment.
For proper operation make sure that the extension shaft on the
cooling thermostat is in the actuator arm dimple. Check by sight-
ing through the control plate viewport. (See Fig. 4) If the shaft is
not in the dimple, cool the thermostat by holding ice to the large
end until the shafts retracts and move the shaft into the dimple.
BLOW PATTERNS (TF-C, TF-CW, AND
TF-HC)
A major selling feature of the TF-C, TF-CW and TF-HC diffusers
is the ability to easily add or remove blow patterns in the field.
This is done by blocking the air off behind the blades on the
appropriate sides.
DO NOT:
— Disconnect the spokes.
— Tape, screw or otherwise lock the blade closed. This unbalan-
ces the loads on the center bearings.
— Block the four venturi nozzles.
DO block air flow behind the blades or between the standoffs.
(Standoffs are the supports between the housing and the diffu-
sion plate.) Ways to do this are:
1. Factory installed directional baffles. These are strips of metal
wrapped around the standoffs to block one, two or three sides.
These can be removed in the field after first removing the dif-
fusion plate assembly.
2. Field installed directional baffles. These are trapezoid pieces of
metal that are laid horizontally on top of the corner supports.
Dimensions are as shown in Fig. 5. Directional baffles can be
made locally or purchased from Acutherm.
3. 1-5/8" diameter x 10" long (Armaflex) for split system refrig-
eration lines. Insert between the housing and the diffusion
plate/blade assembly and wedge between the standoffs (See
Fig. 6). Not supplied by Acutherm but easily available in the
field.
The rule for blocking the appropriate side is: Always block the ther-
mostat side. (See Fig. 7 for examples.)
Note: Some earlier TF-C and TF-CW models have one induction
slot by the thermostat instead of four venturi nozzles. The
rule for blocking the appropriate side for this version is:
Never block the thermostat side.
When blocking for direction, the air volume for a given static
pressure is reduced from max. air volume listed in the perform-
ance guide by:
Blow Patterns Reduction
 3 way .78
 2 way .56
 1 way .34
MAINTENANCE
The moving parts of the TF Therma-Fuser diffuser have no main-
tenance or lubrication requirements. We are often asked to rec-
ommend periodic maintenance procedures and a spare parts
stock. Recommended maintenance is to clean the outer surfaces
of the Therma-Fuser diffuser—nothing else. We do not recom-
mend stocking any spare parts. Our customers also confirm that
stocking is unnecessary.
DAMPER BLADE ADJUSTMENT (TF-C,
TF-CW, AND TF-HC)
If one of the blades does not track uniformly with the others,
make a simple field adjustment to the spoke wire which connects
the blade to the control plate. A pair of needle nose pliers or sim-
ilar tool is all that is required. If the blade does not open as rap-
idly as the other blades, insert the pliers inside of the closed
loope in the spoke wire and slightly expand the loop. If the blade
opens more rapidly than the others, place the pliers outside of
the closed loop and slightly compress the loop. No other adjust-
ment is required.
Continued on next page
Fig. 5 Field installed baffle
Fig. 6 Foam directional baffle
87/16" – 214mm
1511/16" – 398mm
3/4"–19mm Dia.
19/16" – 40mm
45° TYP.
Corners Clipped – No Sharp Points
33/4" – 95mm
3/32"
2mm TYP.
3/16" – 1mm TYP.
THERMA-FUSER
DIFFUSER
THERMA-FUSER
DIFFUSER
Directional Baffle
Fig. 7 Blow Patterns
3-Way D3 2-Way D2 Opposite
2-Way D2C Corner 1-Way D1
Page 3
The thermostats may be slightly harder to screw in or out when
warm because the shaft is extended putting more pressure on the
thermostat. If you are unable to turn the thermostat in this situa-
tion, cool the thermostat by holding an ice cube to the large end.
The shaft will then contract and the thermostat will turn easily for
adjustment.
For proper operation make sure that the extension shaft on the
cooling thermostat is in the actuator arm dimple. Check by sight-
ing through the control plate viewport. (See Fig. 4) If the shaft is
not in the dimple, cool the thermostat by holding ice to the large
end until the shafts retracts and move the shaft into the dimple.
BLOW PATTERNS (TF-C, TF-CW, AND
TF-HC)
A major selling feature of the TF-C, TF-CW and TF-HC diffusers
is the ability to easily add or remove blow patterns in the field.
This is done by blocking the air off behind the blades on the
appropriate sides.
DO NOT:
— Disconnect the spokes.
— Tape, screw or otherwise lock the blade closed. This unbalan-
ces the loads on the center bearings.
— Block the four venturi nozzles.
DO block air flow behind the blades or between the standoffs.
(Standoffs are the supports between the housing and the diffu-
sion plate.) Ways to do this are:
1. Factory installed directional baffles. These are strips of metal
wrapped around the standoffs to block one, two or three sides.
These can be removed in the field after first removing the dif-
fusion plate assembly.
2. Field installed directional baffles. These are trapezoid pieces of
metal that are laid horizontally on top of the corner supports.
Dimensions are as shown in Fig. 5. Directional baffles can be
made locally or purchased from Acutherm.
3. 1-5/8" diameter x 10" long (Armaflex) for split system refrig-
eration lines. Insert between the housing and the diffusion
plate/blade assembly and wedge between the standoffs (See
Fig. 6). Not supplied by Acutherm but easily available in the
field.
The rule for blocking the appropriate side is: Always block the ther-
mostat side. (See Fig. 7 for examples.)
Note: Some earlier TF-C and TF-CW models have one induction
slot by the thermostat instead of four venturi nozzles. The
rule for blocking the appropriate side for this version is:
Never block the thermostat side.
When blocking for direction, the air volume for a given static
pressure is reduced from max. air volume listed in the perform-
ance guide by:
Blow Patterns Reduction
 3 way .78
 2 way .56
 1 way .34
MAINTENANCE
The moving parts of the TF Therma-Fuser diffuser have no main-
tenance or lubrication requirements. We are often asked to rec-
ommend periodic maintenance procedures and a spare parts
stock. Recommended maintenance is to clean the outer surfaces
of the Therma-Fuser diffuser—nothing else. We do not recom-
mend stocking any spare parts. Our customers also confirm that
stocking is unnecessary.
DAMPER BLADE ADJUSTMENT (TF-C,
TF-CW, AND TF-HC)
If one of the blades does not track uniformly with the others,
make a simple field adjustment to the spoke wire which connects
the blade to the control plate. A pair of needle nose pliers or sim-
ilar tool is all that is required. If the blade does not open as rap-
idly as the other blades, insert the pliers inside of the closed
loope in the spoke wire and slightly expand the loop. If the blade
opens more rapidly than the others, place the pliers outside of
the closed loop and slightly compress the loop. No other adjust-
ment is required.
Continued on next page
Fig. 5 Field installed baffle
Fig. 6 Foam directional baffle
87/16" – 214mm
1511/16" – 398mm
3/4"–19mm Dia.
19/16" – 40mm
45° TYP.
Corners Clipped – No Sharp Points
33/4" – 95mm
3/32"
2mm TYP.
3/16" – 1mm TYP.
THERMA-FUSER
DIFFUSER
THERMA-FUSER
DIFFUSER
Directional Baffle
Fig. 7 Blow Patterns
3-Way D3 2-Way D2 Opposite
2-Way D2C Corner 1-Way D1
Page 3

7
acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
The moving parts of the TF Therma-Fuser diffuser have no maintenance or lubrication requirements. We are often asked to
recommend periodic maintenance procedures and a spare parts stock. Recommended maintenance is to clean the outer surfaces
of the Therma-Fuser diffuser—nothing else. We do not recommend stocking any spare parts. Our customers also confirm that
stocking is unnecessary.
Damper Blade Adjustment (TF-C, TF-CW, AND TF-HC)
If one of the blades does not track uniformly with the others, make a simple field adjustment to the spoke wire which connects
the blade to the control plate. A pair of needle nose pliers or similar tool is all that is required. If the blade does not open as rapidly
as the other blades, insert the pliers inside of the closed loope in the spoke wire and slightly expand the loop. If the blade opens
more rapidly than the others, place the pliers outside of the closed loop and slightly compress the loop. No other adjustment is
required.
MAINTENANCE

8acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
THERMA-FUSER - Manual | acutherm.com
TROUBLE SHOOTING (TF-C, TF-CW AND TF-HC)
Trouble shooting Therma-Fuser diffusers requires looking at the systems as a whole. Before examining the Therma-Fuser diffuser
for failure it is worth the time to be sure the system is functioning properly and that something has not been overlooked. Before
calling Acutherm, please complete the data log for all Therma-Fuser diffusers to be evaluated.
System Check
The system should be:
1. Delivering 50°- 68°F/10° - 20°C supply air when in the
cooling mode.
2. Delivering 80°-120°F/26.5° – 49°C supply air when in the
heating mode (TF-CW and TF-HC).
3. Maintaining static pressure at the inlet to each Therma-
Fuser diffuser between .05 and .25"wg/12 Pa and 62 Pa.
4. Maintaining continuous fan operation during occupied
hours.
Therma-Fuser Diffuser Check
Once the above checks have been completed examine and record the following (Conditions may vary over time; several
measurements at different times may be required):
5. Room temperature 4ft/1.2m above the floor directly under
the Therma-Fuser diffuser.
6. Supply air temperature at the Therma-Fuser diffuser.
7. Static pressure at the inlet of the Therma-Fuser diffuser.
8. Blade opening from the edge of the blade, measured
perpendicular to the housing.
9. Control plate position (clockwise or counter clockwise
from center).
10. Cooling and heating setpoints.
11. Thermostat extension.
12. Is the Therma-Fuser diffuser located within 2ft/600mm of a
vertical protrusion such as a wall or dropped beam which
could disturb induction air flow? COOLING MODE − CLOCKWISE
FROM CENTER POSITION
HEATING MODE − COUNTER
CLOCKWISE FROM CENTER POSITION
TROUBLE SHOOTING (TF-C, TF-CW
AND TF-HC)
Trouble shooting Therma-Fuser diffusers requires looking at the
systems as a whole. Before examining the Therma-Fuser diffuser
for failure it is worth the time to be sure the system is functioning
properly and that something has not been overlooked. Before
calling Acutherm, please complete the data log for all Therma-
Fuser diffusers to be evaluated.
SYSTEM CHECK
The system should be:
1. Delivering 50°- 68°F/10° - 20°C supply air when in the  
 cooling mode.
2. Delivering 80°-120°F/26.5° – 49°C supply air when in the  
 heating mode (TF-CW and TF-HC).
3. Maintaining static pressure at the inlet to each Therma- 
 Fuser diffuser between .05 and .25"wg/12 Pa and 62 Pa.
4. Maintaining continuous fan operation during occupied hours.
THERMA-FUSER DIFFUSER CHECK
Once the above checks have been completed examine and
record the following (Conditions may vary over time; several
measurements at different times may be required):
5. Room temperature 4ft/1.2m above the floor directly under 
 the Therma-Fuser diffuser.
6. Supply air temperature at the Therma-Fuser diffuser.
7.  Static pressure at the inlet of the Therma-Fuser diffuser.
8. Blade opening from the edge of the blade, measured  
 perpendicular to the housing.
9. Control plate position (clockwise or counter clockwise from 
 center).
10. Cooling and heating
 setpoints.
11. Thermostat extension.
12. Is the Therma-Fuser  
 diffuser located within 
 2ft/600mm of a verti- 
 cal protrusion such as 
 a wall or dropped  
 beam which could dis-
 turb induction air flow?
Protected by U.S. Patents RE 30,953 and 4,523,713.
Canada: Patent 1987 – Brevete 1987.
Patents pending in other countries
Subject to change without notice.
Form 12.2 REV 1704
Printed in USA on Recycled Paper with Soybean Based Ink
6379 Clark Ave Suite 280
Dublin CA 94568, USA
Tel: [phone]
http://www.acutherm.com
e-mail: [email protected]
Cooling thermostat
Heating thermostat
Heating Mode—counter clock-
wise from center position
Cooling Mode—clockwise from
center position
TEN YEAR WARRANTY
Acutherm warrants that its Model TF Therma-Fuser diffusers, exclusive of
any options and accessories (whether factory or field installed) shall be
free from defects in material or workmanship for a period of ten (10)
years from the date of shipment and agrees to repair or replace, at its
option, any parts that fail during said ten (10) year period due to any such
defects which would not have occured had reasonable care been taken,
provided that such parts have been inspected by Acutherm and found
defective and provided the diffusers have been given normal and proper
usage and all parts and controls remain unaltered. Acutherm makes NO
WARRANTY OF MERCHANTABILITY OF PRODUCTS OR OF THEIR FIT-
NESS FOR ANY PURPOSE OR ANY OTHER EXPRESS OR IMPLIED
WARRANTY WHICH EXTENDES BEYOND THE LIMITED WARRANTY
ABOVE. ACUTHERM'S LIABILITY FOR ANY AND ALL LOSSES AND
DAMAGES RESULTING FROM DEFECTS SHALL IN NO EVENT
EXCEED THE COST OF REPAIR OR REPLACEMENT OF PARTS FOUND
DEFECTIVE UPON EXAMINATION BY ACUTHERM. IN NO EVENT
SHALL ACUTHERM BE LIABLE FOR INCIDENTAL, INDIRECT OR CON-
SEQUENTIAL DAMAGES OR DAMAGES FOR INJURY TO PERSONS OR
PROPERTY. Acutherm shall not be responsible for freight to or from its
plant in connection with the inspection, repair or replacement of parts
under the terms of this limited warranty nor for cost of removal or installa-
tion.
DATA LOG
Control
Disc
Position
Blade
Opening
Duct
S.P.
S.A.
Temp
Room
Temp
TimeDateLocation Set Points Extension
Heating Cooling Heating Cooling
Read Setpoint
Here
Measure Extension
Here
Foam
Housing
Blade
Small Steel Rule
Page 4
TROUBLE SHOOTING (TF-C, TF-CW
AND TF-HC)
Trouble shooting Therma-Fuser diffusers requires looking at the
systems as a whole. Before examining the Therma-Fuser diffuser
for failure it is worth the time to be sure the system is functioning
properly and that something has not been overlooked. Before
calling Acutherm, please complete the data log for all Therma-
Fuser diffusers to be evaluated.
SYSTEM CHECK
The system should be:
1. Delivering 50°- 68°F/10° - 20°C supply air when in the  
 cooling mode.
2. Delivering 80°-120°F/26.5° – 49°C supply air when in the  
 heating mode (TF-CW and TF-HC).
3. Maintaining static pressure at the inlet to each Therma- 
 Fuser diffuser between .05 and .25"wg/12 Pa and 62 Pa.
4. Maintaining continuous fan operation during occupied hours.
THERMA-FUSER DIFFUSER CHECK
Once the above checks have been completed examine and
record the following (Conditions may vary over time; several
measurements at different times may be required):
5. Room temperature 4ft/1.2m above the floor directly under 
 the Therma-Fuser diffuser.
6. Supply air temperature at the Therma-Fuser diffuser.
7.  Static pressure at the inlet of the Therma-Fuser diffuser.
8. Blade opening from the edge of the blade, measured  
 perpendicular to the housing.
9. Control plate position (clockwise or counter clockwise from 
 center).
10. Cooling and heating
 setpoints.
11. Thermostat extension.
12. Is the Therma-Fuser  
 diffuser located within 
 2ft/600mm of a verti- 
 cal protrusion such as 
 a wall or dropped  
 beam which could dis-
 turb induction air flow?
Protected by U.S. Patents RE 30,953 and 4,523,713.
Canada: Patent 1987 – Brevete 1987.
Patents pending in other countries
Subject to change without notice.
Form 12.2 REV 1704
Printed in USA on Recycled Paper with Soybean Based Ink
6379 Clark Ave Suite 280
Dublin CA 94568, USA
Tel: [phone]
http://www.acutherm.com
e-mail: [email protected]
Cooling thermostat
Heating thermostat
Heating Mode—counter clock-
wise from center position
Cooling Mode—clockwise from
center position
TEN YEAR WARRANTY
Acutherm warrants that its Model TF Therma-Fuser diffusers, exclusive of
any options and accessories (whether factory or field installed) shall be
free from defects in material or workmanship for a period of ten (10)
years from the date of shipment and agrees to repair or replace, at its
option, any parts that fail during said ten (10) year period due to any such
defects which would not have occured had reasonable care been taken,
provided that such parts have been inspected by Acutherm and found
defective and provided the diffusers have been given normal and proper
usage and all parts and controls remain unaltered. Acutherm makes NO
WARRANTY OF MERCHANTABILITY OF PRODUCTS OR OF THEIR FIT-
NESS FOR ANY PURPOSE OR ANY OTHER EXPRESS OR IMPLIED
WARRANTY WHICH EXTENDES BEYOND THE LIMITED WARRANTY
ABOVE. ACUTHERM'S LIABILITY FOR ANY AND ALL LOSSES AND
DAMAGES RESULTING FROM DEFECTS SHALL IN NO EVENT
EXCEED THE COST OF REPAIR OR REPLACEMENT OF PARTS FOUND
DEFECTIVE UPON EXAMINATION BY ACUTHERM. IN NO EVENT
SHALL ACUTHERM BE LIABLE FOR INCIDENTAL, INDIRECT OR CON-
SEQUENTIAL DAMAGES OR DAMAGES FOR INJURY TO PERSONS OR
PROPERTY. Acutherm shall not be responsible for freight to or from its
plant in connection with the inspection, repair or replacement of parts
under the terms of this limited warranty nor for cost of removal or installa-
tion.
DATA LOG
Control
Disc
Position
Blade
Opening
Duct
S.P.
S.A.
Temp
Room
Temp
TimeDateLocation Set Points Extension
Heating Cooling Heating Cooling
Read Setpoint
Here
Measure Extension
Here
Foam
Housing
Blade
Small Steel Rule
Page 4
TROUBLE SHOOTING (TF-C, TF-CW
AND TF-HC)
Trouble shooting Therma-Fuser diffusers requires looking at the
systems as a whole. Before examining the Therma-Fuser diffuser
for failure it is worth the time to be sure the system is functioning
properly and that something has not been overlooked. Before
calling Acutherm, please complete the data log for all Therma-
Fuser diffusers to be evaluated.
SYSTEM CHECK
The system should be:
1. Delivering 50°- 68°F/10° - 20°C supply air when in the  
 cooling mode.
2. Delivering 80°-120°F/26.5° – 49°C supply air when in the  
 heating mode (TF-CW and TF-HC).
3. Maintaining static pressure at the inlet to each Therma- 
 Fuser diffuser between .05 and .25"wg/12 Pa and 62 Pa.
4. Maintaining continuous fan operation during occupied hours.
THERMA-FUSER DIFFUSER CHECK
Once the above checks have been completed examine and
record the following (Conditions may vary over time; several
measurements at different times may be required):
5. Room temperature 4ft/1.2m above the floor directly under 
 the Therma-Fuser diffuser.
6. Supply air temperature at the Therma-Fuser diffuser.
7.  Static pressure at the inlet of the Therma-Fuser diffuser.
8. Blade opening from the edge of the blade, measured  
 perpendicular to the housing.
9. Control plate position (clockwise or counter clockwise from 
 center).
10. Cooling and heating
 setpoints.
11. Thermostat extension.
12. Is the Therma-Fuser  
 diffuser located within 
 2ft/600mm of a verti- 
 cal protrusion such as 
 a wall or dropped  
 beam which could dis-
 turb induction air flow?
Protected by U.S. Patents RE 30,953 and 4,523,713.
Canada: Patent 1987 – Brevete 1987.
Patents pending in other countries
Subject to change without notice.
Form 12.2 REV 1704
Printed in USA on Recycled Paper with Soybean Based Ink
6379 Clark Ave Suite 280
Dublin CA 94568, USA
Tel: [phone]
http://www.acutherm.com
e-mail: [email protected]
Cooling thermostat
Heating thermostat
Heating Mode—counter clock-
wise from center position
Cooling Mode—clockwise from
center position
TEN YEAR WARRANTY
Acutherm warrants that its Model TF Therma-Fuser diffusers, exclusive of
any options and accessories (whether factory or field installed) shall be
free from defects in material or workmanship for a period of ten (10)
years from the date of shipment and agrees to repair or replace, at its
option, any parts that fail during said ten (10) year period due to any such
defects which would not have occured had reasonable care been taken,
provided that such parts have been inspected by Acutherm and found
defective and provided the diffusers have been given normal and proper
usage and all parts and controls remain unaltered. Acutherm makes NO
WARRANTY OF MERCHANTABILITY OF PRODUCTS OR OF THEIR FIT-
NESS FOR ANY PURPOSE OR ANY OTHER EXPRESS OR IMPLIED
WARRANTY WHICH EXTENDES BEYOND THE LIMITED WARRANTY
ABOVE. ACUTHERM'S LIABILITY FOR ANY AND ALL LOSSES AND
DAMAGES RESULTING FROM DEFECTS SHALL IN NO EVENT
EXCEED THE COST OF REPAIR OR REPLACEMENT OF PARTS FOUND
DEFECTIVE UPON EXAMINATION BY ACUTHERM. IN NO EVENT
SHALL ACUTHERM BE LIABLE FOR INCIDENTAL, INDIRECT OR CON-
SEQUENTIAL DAMAGES OR DAMAGES FOR INJURY TO PERSONS OR
PROPERTY. Acutherm shall not be responsible for freight to or from its
plant in connection with the inspection, repair or replacement of parts
under the terms of this limited warranty nor for cost of removal or installa-
tion.
DATA LOG
Control
Disc
Position
Blade
Opening
Duct
S.P.
S.A.
Temp
Room
Temp
TimeDateLocation Set Points Extension
Heating Cooling Heating Cooling
Read Setpoint
Here
Measure Extension
Here
Foam
Housing
Blade
Small Steel Rule
Page 4
TROUBLE SHOOTING (TF-C, TF-CW
AND TF-HC)
Trouble shooting Therma-Fuser diffusers requires looking at the
systems as a whole. Before examining the Therma-Fuser diffuser
for failure it is worth the time to be sure the system is functioning
properly and that something has not been overlooked. Before
calling Acutherm, please complete the data log for all Therma-
Fuser diffusers to be evaluated.
SYSTEM CHECK
The system should be:
1. Delivering 50°- 68°F/10° - 20°C supply air when in the  
 cooling mode.
2. Delivering 80°-120°F/26.5° – 49°C supply air when in the  
 heating mode (TF-CW and TF-HC).
3. Maintaining static pressure at the inlet to each Therma- 
 Fuser diffuser between .05 and .25"wg/12 Pa and 62 Pa.
4. Maintaining continuous fan operation during occupied hours.
THERMA-FUSER DIFFUSER CHECK
Once the above checks have been completed examine and
record the following (Conditions may vary over time; several
measurements at different times may be required):
5. Room temperature 4ft/1.2m above the floor directly under 
 the Therma-Fuser diffuser.
6. Supply air temperature at the Therma-Fuser diffuser.
7.  Static pressure at the inlet of the Therma-Fuser diffuser.
8. Blade opening from the edge of the blade, measured  
 perpendicular to the housing.
9. Control plate position (clockwise or counter clockwise from 
 center).
10. Cooling and heating
 setpoints.
11. Thermostat extension.
12. Is the Therma-Fuser  
 diffuser located within 
 2ft/600mm of a verti- 
 cal protrusion such as 
 a wall or dropped  
 beam which could dis-
 turb induction air flow?
Protected by U.S. Patents RE 30,953 and 4,523,713.
Canada: Patent 1987 – Brevete 1987.
Patents pending in other countries
Subject to change without notice.
Form 12.2 REV 1704
Printed in USA on Recycled Paper with Soybean Based Ink
6379 Clark Ave Suite 280
Dublin CA 94568, USA
Tel: [phone]
http://www.acutherm.com
e-mail: [email protected]
Cooling thermostat
Heating thermostat
Heating Mode—counter clock-
wise from center position
Cooling Mode—clockwise from
center position
TEN YEAR WARRANTY
Acutherm warrants that its Model TF Therma-Fuser diffusers, exclusive of
any options and accessories (whether factory or field installed) shall be
free from defects in material or workmanship for a period of ten (10)
years from the date of shipment and agrees to repair or replace, at its
option, any parts that fail during said ten (10) year period due to any such
defects which would not have occured had reasonable care been taken,
provided that such parts have been inspected by Acutherm and found
defective and provided the diffusers have been given normal and proper
usage and all parts and controls remain unaltered. Acutherm makes NO
WARRANTY OF MERCHANTABILITY OF PRODUCTS OR OF THEIR FIT-
NESS FOR ANY PURPOSE OR ANY OTHER EXPRESS OR IMPLIED
WARRANTY WHICH EXTENDES BEYOND THE LIMITED WARRANTY
ABOVE. ACUTHERM'S LIABILITY FOR ANY AND ALL LOSSES AND
DAMAGES RESULTING FROM DEFECTS SHALL IN NO EVENT
EXCEED THE COST OF REPAIR OR REPLACEMENT OF PARTS FOUND
DEFECTIVE UPON EXAMINATION BY ACUTHERM. IN NO EVENT
SHALL ACUTHERM BE LIABLE FOR INCIDENTAL, INDIRECT OR CON-
SEQUENTIAL DAMAGES OR DAMAGES FOR INJURY TO PERSONS OR
PROPERTY. Acutherm shall not be responsible for freight to or from its
plant in connection with the inspection, repair or replacement of parts
under the terms of this limited warranty nor for cost of removal or installa-
tion.
DATA LOG
Control
Disc
Position
Blade
Opening
Duct
S.P.
S.A.
Temp
Room
Temp
TimeDateLocation Set Points Extension
Heating Cooling Heating Cooling
Read Setpoint
Here
Measure Extension
Here
Foam
Housing
Blade
Small Steel Rule
Page 4
TROUBLE SHOOTING (TF-C, TF-CW
AND TF-HC)
Trouble shooting Therma-Fuser diffusers requires looking at the
systems as a whole. Before examining the Therma-Fuser diffuser
for failure it is worth the time to be sure the system is functioning
properly and that something has not been overlooked. Before
calling Acutherm, please complete the data log for all Therma-
Fuser diffusers to be evaluated.
SYSTEM CHECK
The system should be:
1. Delivering 50°- 68°F/10° - 20°C supply air when in the  
 cooling mode.
2. Delivering 80°-120°F/26.5° – 49°C supply air when in the  
 heating mode (TF-CW and TF-HC).
3. Maintaining static pressure at the inlet to each Therma- 
 Fuser diffuser between .05 and .25"wg/12 Pa and 62 Pa.
4. Maintaining continuous fan operation during occupied hours.
THERMA-FUSER DIFFUSER CHECK
Once the above checks have been completed examine and
record the following (Conditions may vary over time; several
measurements at different times may be required):
5. Room temperature 4ft/1.2m above the floor directly under 
 the Therma-Fuser diffuser.
6. Supply air temperature at the Therma-Fuser diffuser.
7.  Static pressure at the inlet of the Therma-Fuser diffuser.
8. Blade opening from the edge of the blade, measured  
 perpendicular to the housing.
9. Control plate position (clockwise or counter clockwise from 
 center).
10. Cooling and heating
 setpoints.
11. Thermostat extension.
12. Is the Therma-Fuser  
 diffuser located within 
 2ft/600mm of a verti- 
 cal protrusion such as 
 a wall or dropped  
 beam which could dis-
 turb induction air flow?
Protected by U.S. Patents RE 30,953 and 4,523,713.
Canada: Patent 1987 – Brevete 1987.
Patents pending in other countries
Subject to change without notice.
Form 12.2 REV 1704
Printed in USA on Recycled Paper with Soybean Based Ink
6379 Clark Ave Suite 280
Dublin CA 94568, USA
Tel: [phone]
http://www.acutherm.com
e-mail: [email protected]
Cooling thermostat
Heating thermostat
Heating Mode—counter clock-
wise from center position
Cooling Mode—clockwise from
center position
TEN YEAR WARRANTY
Acutherm warrants that its Model TF Therma-Fuser diffusers, exclusive of
any options and accessories (whether factory or field installed) shall be
free from defects in material or workmanship for a period of ten (10)
years from the date of shipment and agrees to repair or replace, at its
option, any parts that fail during said ten (10) year period due to any such
defects which would not have occured had reasonable care been taken,
provided that such parts have been inspected by Acutherm and found
defective and provided the diffusers have been given normal and proper
usage and all parts and controls remain unaltered. Acutherm makes NO
WARRANTY OF MERCHANTABILITY OF PRODUCTS OR OF THEIR FIT-
NESS FOR ANY PURPOSE OR ANY OTHER EXPRESS OR IMPLIED
WARRANTY WHICH EXTENDES BEYOND THE LIMITED WARRANTY
ABOVE. ACUTHERM'S LIABILITY FOR ANY AND ALL LOSSES AND
DAMAGES RESULTING FROM DEFECTS SHALL IN NO EVENT
EXCEED THE COST OF REPAIR OR REPLACEMENT OF PARTS FOUND
DEFECTIVE UPON EXAMINATION BY ACUTHERM. IN NO EVENT
SHALL ACUTHERM BE LIABLE FOR INCIDENTAL, INDIRECT OR CON-
SEQUENTIAL DAMAGES OR DAMAGES FOR INJURY TO PERSONS OR
PROPERTY. Acutherm shall not be responsible for freight to or from its
plant in connection with the inspection, repair or replacement of parts
under the terms of this limited warranty nor for cost of removal or installa-
tion.
DATA LOG
Control
Disc
Position
Blade
Opening
Duct
S.P.
S.A.
Temp
Room
Temp
TimeDateLocation Set Points Extension
Heating Cooling Heating Cooling
Read Setpoint
Here
Measure Extension
Here
Foam
Housing
Blade
Small Steel Rule
Page 4

9
acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
TROUBLE SHOOTING (TF-C, TF-CW AND TF-HC)
Data Log
Location Date Time Room
/Temp
S.A.
Temp
Duct
S.P.
Blade
Opening
Control
Disk
Position
Set Points Set Points
Cooling Heating Cooling Heating

acutherm.com | THERMA-FUSER - Manual
10 acutherm.com | THERMA-FUSER - Manual
THERMA-FUSER
THERMA-FUSER - Manual | acutherm.com
Acutherm warrants that its Model TF Therma-Fuser diffusers, exclusive of any options and accessories (whether factory or field
installed) shall be free from defects in material or workmanship for a period of ten (10) years from the date of shipment and agrees
to repair or replace, at its option, any parts that fail during said ten (10) year period due to any such defects which would not have
occured had reasonable care been taken, provided that such parts have been inspected by Acutherm and found defective and
provided the diffusers have been given normal and proper usage and all parts and controls remain unaltered. Acutherm makes
NO WARRANTY OF MERCHANTABILITY OF PRODUCTS OR OF THEIR FITNESS FOR ANY PURPOSE OR ANY OTHER
EXPRESS OR IMPLIED WARRANTY WHICH EXTENDES BEYOND THE LIMITED WARRANTY ABOVE. ACUTHERM'S
LIABILITY FOR ANY AND ALL LOSSES AND DAMAGES RESULTING FROM DEFECTS SHALL IN NO EVENT EXCEED
THE COST OF REPAIR OR REPLACEMENT OF PARTS FOUND DEFECTIVE UPON EXAMINATION BY ACUTHERM.
IN NO EVENT SHALL ACUTHERM BE LIABLE FOR INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
DAMAGES FOR INJURY TO PERSONS OR PROPERTY. Acutherm shall not be responsible for freight to or from its plant in
connection with the inspection, repair or replacement of parts under the terms of this limited warranty nor for cost of removal
or installation.
TEN YEAR WARRANTY

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