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
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