Adp UHRS-030A User manual

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Siin and Pain ist ..............................................
UHRS3 Comat Unit imensions.....................3
Comat Unit Parts Arranement ...................................4
UHCM Standard Unit imensions ....................
UHCM4 Standard Unit imensions ....................
Standard Unit Parts Arranement...................................
Otional Aessor .........................................................
Reuirements in USA .....................................................
Reuirements in Canada ................................................
Additional Reuirements ................................................
Unit Heater nstallation ...................................................
Comustion and entilation Air.....................................
Rotation o Comustion Air nduer  .............. 
entin.......................................................................... 
letrial Connetions ..................................................
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Gas Connetion ............................................................
ea Ce ...................................................................
Unit StartU .................................................................
To Turn Off Gas to Unit ................................................3
Heatin Seuene o Oerations .................................3
Gas Flow........................................................................3
Gas Pressure Adjustments............................................3
nition Control .......................................................4
Hi Altitude Adjustments.................................................4
imit Control Swit .......................................................
ouer ane Adjustment ...............................................
Comustion Air Pressure Swit ..................................
Flame Rollout Swit ...................................................
Serie...........................................................................
StartU and Perormane Celist ............................

Page 2
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UHRS8QLWV
Package 1 of 1 contains:
1-Unit Heater
2-Hanging brackets
Bag assembly containing:
1-Warranty card
1-Brand logo badge
8-10-16 X 5/8” SDST screws
1-3/8” Snap bushing
3-Wire ties
The heater is shipped completely assembled. Check the unit
forshipping damage. The receiving party should contact the
last carrier immediately if any shipping damage is found.
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UNIT
HEATER
BAG
ASSEMBLY
REMOVE BRACETS SECURING
UNIT TO SHIPPING CRATE
BEFORE INSTALLATION
FLUE
TRANSITION
BURNER
BOX HOOD
UHCM 8QLWV
Package 1 of 1 contains:
1-Unit Heater
1-Burner box hood
1-5” Diameter Flue transition (6” diameter on 350-400)
Bag assembly containing:
1-Warranty card
1-Brand logo badge
8-10-16 X 5/8” SDST screws
2-Wire ties
The heater is shipped completely assembled. Check the unit
forshipping damage. The receiving party should contact the
last carrier immediately if any shipping damage is found.

Page 3
2-3/4
(70)
8-3/4
(222) 10-1/2
(267)
4-1/4
(108)
1/2
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1
(25)
21
(533)
1
(25)
$
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FLUE
OUTLET
GAS
INLET
DIRECT
DRIVE FAN
ELECTRICAL
INLET
BRACETS (2)
HANGING
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MOUNTING SLOTS (Typical)
5/16 x 3 Inches (8 x 76 mm)
HANGING
BRACETS (2)
SERVICE
ACCESS
PANEL
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ADJUSTABLE
LOUVERS
1
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Model
No.
ABCD
in. mm in. mm in. mm in. mm
UHRS-030A
UHRS-045A 12-3/8 314 6-1/2 165 4 102 6 152
UHRS-060A
UHRS-075A 17-1/2 445 6-1/4 159 6-1/8 156 3-5/8 92
UHRS-090A
UHRS-105A 23 584 7-7/8 200 9-1/8 232 3-5/8 92

Page 4

Page 5
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ADJUSTABLE
LOUVERS
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COMBUSTION AIR
INDUCER
DIRECT DRIVE FAN
GAS VALVE
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HEAT
EXCHANGER
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ELECTRICAL INLETS
FLUE OUTLET
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(4) 3/8-16 MOUNTING NUTS
FOR UNIT SUSPENSION
16 (406)
1/2 (13)
5-3/8
(137)
%
1/2 (13)
31-7/8 (810) 10-5/8
(270)
35-1/4
(895)
10-1/2
(267)
2-1/2 (64)
3-1/8 (79)
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Model
No.
ABCD
in. mm in. mm in. mm in. mm
UHCM-125
UHCM-150 19-1/2 495 18-1/2 470 12-1/4 311 4-3/4 121
UHCM-175
UHCM-200 25 635 23-3/4 603 9-1/2 241 3 76

Page 6
$
&
%
ADJUSTABLE
LOUVERS
7239,(:
ELECTRICAL INLETS
FLUE OUTLET
(4) 3/8-16 MOUNTING NUTS
FOR UNIT SUSPENSION
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AIR
FLOW
6,'(9,(:
COMBUSTION AIR
INDUCER
DIRECT DRIVE FAN
GAS VALVE
HEAT
EXCHANGER
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1/2 (13)
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(270)
5-3/8
(137)
10-1/2
(267)
1/2 (13)
35-1/4
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3
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2-5/8 (67)
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Model
No.
ABC
in. mm in. mm in. mm
UHCM-250
UHCM-300 37-5/8 956 36-1/2 927 15-7/8 403
UHCM-350
UHCM-400 47 1194 45-3/4 1162 20-1/2 521

Page 7

Page 8
Units require a changeover kit when the unit is to be used
with Natural gas. The kit is ordered separately. See
Engineering Handbook.
Installation of gas unit heaters must conform with local
building codes or, in the absence of local codes, with the
current edition of ANSI Z223.1, National Fuel Gas Code.
Installation in aircraft hangers must be in accordance with
the current edition of ANSI/NFPA No. 409, Standard for
Aircraft Hangers.
Installation in parking structures must be in accordance
with the current edition of ANSI/NFPA No. 88A, Standard
for Parking Structures.
Installation in repair garages must be in accordance with
the current edition of ANSI/NFPA No. 88B, Standard for
Repair Garages.
These units are approved for residential garage or non-
confined living space applications. For installation in a
residential garage or non-confined living space, unit must
be installed so that burners and ignition source are
located no less than 18” (457mm) above floor. Heater
must be located or protected to avoid physical damage
by vehicles. Refer to the current edition of ANSI Z223.1,
National Fuel Gas Code.
Authorities having jurisdiction should be consulted before
installation. Air for combustion and ventilation must con-
form to the methods outlined in the current edition of ANSI
Z223.1, Section 5.3, Air for Combustion and Ventilation, or
applicable provisions of local building codes.
The National Fuel Gas Code (ANSI Z223.1) is available
from:
American National Standard Institute Inc.
11 West 42nd Street
New York, NY 10036
These unit heaters are CSA International design-certified.
These unit heaters are certified for installation to combus-
tible material as listed in Table 1 and on unit rating plate.
Accessibility and service clearances must be observed in
addition to fire protection clearances.
All electrical wiring and grounding for unit must be in ac-
cordance with the regulations of the current edition of
ANSI/NFPA No. 70, National Electric Code.
The National Electric Code is available from:
National Fire Protection Association
1 Batterymarch Park
PO Box 9101
uincy, MA 02269-9101
These instructions are intended only as a general guide
and do not supersede local codes in any way. Authorities
having jurisdiction should be consulted before installation.
The installation must conform with local building codes or,
in the absence of local codes, with the current edition of
CSA-B149 installation compliance codes. All electrical wir-
ing and grounding for the unit must also comply with the
current edition of CSA C22.1, Canadian Electrical Code.
These unit heaters are CSA-certified for the installation
clearances listed on the rating plate and in table 1.
Adequate clearance must be provided around the appli-
ance and around air openings into the combustion cham-
ber. Provision shall be made for service accessibility.
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1 - In a storage area, clearance from heaters to
combustible materials must be such that the
combustible material must not attain a temperature
above 160°F (71°C) by continuous operation of the
unit.
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Combustible materials that are affected by exposure to
temperatures LESS than 160°F or 71°C (plastics,
plastic wrap, styrofoam, cardboard, etc.) must be
stored well away from this heater. Discharge air
temperatures for these units can approach 250°F or
121°C.
2 - Maintain an 8-foot (2m) minimum clearance from the
floor to the bottom of the heater. Refer to the current
edition of CSA-B149 for installation compliance
codes.
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1 - In an area where aircraft are housed or serviced, a
10-foot (3m) minimum clearance from the highest
surface of the aircraft to bottom of the heater must
be maintained.
2 - In other areas, an 8-foot (2m) minimum clearance
from the floor to bottom of heater must be maintained.
3 - Heaters should be located so that they are protected
from damage from aircraft or other appliances needed
for servicing of aircraft. Refer to requirements of the
enforcing authorities.
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These units are approved for residential garage or non-
confined living space applications. For installation in a
residential garage or non-confined living space, unit must
be installed so that burners and ignition source are
located no less than 18” (457mm) above floor. Heater
must be located or protected to avoid physical damage by
vehicles. Refer to the current edition of CSA-B149 for in-
stallation compliance codes. In a confined area, the heat-
er must be installed in accordance with the current edition
of CSA-B149 installation compliance codes. Be sure to
check with local codes and ordinances for additional re-
quirements.
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Page 9
*6” is for single wall. Double wall B-vent clearance will be in accordance
with the manufacturer’s listing.
**Access panel or control box side of unit should have 24” (610mm)
clearance.
Additional Requirements
The Commonwealth of Massachusetts stipulates the fol-
lowing additional requirements:
1 - Gas furnaces shall be installed by a licensed
plumber or gas fitter only.
2 - The gas cock must be “T handle” type.
Unit Heater Installation
The appliance shall not be installed downstream from
evaporator coils or cooling units.
Install the unit in the desired location as governed by
clearances, vent connection, air direction, gas supply,
electrical supply and service accessibility.
Unit is shipped ready for installation.
TABLE 1
UNIT CLEARANCES TO COMBUSTIBLE MATERIALS
Unit Top Side** Bottom Back Flue
in mm in mm in mm in mm in mm
030/105 1 25 1 25 1 25 18 457 6* 152
125/400 6 152 18 457 1 25 18 457 6 152
CAUTION
Do not install unit heaters in close proximity to fire
sprinklers. Unit heater normal operating temperatures
could result in fire sprinkler activation.
UHCM-125/400 UNITS
Four mounting nuts are furnished. Refer to dimension
illustration. Mounting nuts will accommodate 3/8” x 16
threaded rods.
1 - Push each louver to the left to depress spring and
release locking tab on the other end (locking tab
keeps the louver in place for shipping).
2 - Rotate louvers to direct airflow as desired.
3- Cut threaded rods to desired length and slide a 3/8”
nut onto the rod.
4 - Slide a flat washer onto the threaded rod AFTER the
nut (7/16” inside diameter X 1” outside diameter X
1/16” thick washer).
5 - Screw the rods (four) into the mounting nuts on the
unit.
6 - Tighten nuts to secure unit to rods.
7 - Install the 3D brand badge provided with the unit.
8 - Install the burner box hood. See figure 1.
FIGURE 1

Page 10
Combustion and Ventilation Air
Adequate facilities for supplying air for combustion and
ventilation must be provided in accordance with the cur-
rent edition of ANSI Z223.1, section 5.3 and CSA-B149
installation compliance codes, or applicable provisions of
local building codes.
All gas-fired appliances require air to be used for com-
bustion. In many buildings today, there is a negative in-
door air pressure caused by exhaust fans, etc. If sufficient
quantities of combustion air are not available, the heater
or another appliance will operate in an inefficient manner,
resulting in incomplete combustion which can result in the
production of excessive carbon monoxide.
UHRS-30/105
Unit may be installed as shown in figure 2 or rotated
180°.
1 - Push each louver to the right to depress spring and
release locking tab on the other end (locking tab
keeps the louver in place for shipping).
2 - If installing unit in a rotated position - release locking
tabs in the same manner as previous step. Rotate
each louver 180° and reinstall. Remove and retain
screws securing access panel. Rotate access panel
180° and re-secure using retained screws.
3 - Rotate louvers to direct airflow as desired.
4 - Choose location for mounting brackets.
5 - Align mounting brackets with pilot holes on the top or
bottom (when rotating) edge of the unit. Secure with
screws provided in bag assembly.
6 - To support unit, secure mounting bracket to ceiling
joist or truss. Unit may also be supported using
support rods as shown in figure 2.
7 - Install the 3D brand badge provided with the unit.
INSTALL UNIT HEATER
SUPPORT
RODS
MOUNTING
BRACKETS
(2)
ACCESS PANEL
(030 / 105 SHOWN)
FIGURE 2
TABLE 2
MAXIMUM MOUNTING HEIGHTS
Unit Feet (Meters)
UHRS-030/075 10 (3.0)
UHRS-090/105 12 (3.7)
UHCM-125/150 16 (4.9)
UHCM-175/200 20 (6.1)
UHCM-250/400 30 (9.1)

Page 11
WARNING
Insufficient combustion air can cause headaches,
nausea, dizziness or asphyxiation. It will also cause
excess water in the heat exchanger resulting in rusting
and premature heat exchanger failure. Excessive
exposure to contaminated combustion air will result
in safety and performance related problems. Avoid
exposure to the following substances in the combustion
air supply:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine base swimming pool chemicals
Water softening chemicals
De-icing salts or chemicals
Carbon tetrachloride
Halogen type refrigerants
Cleaning solvents (such as perchloroethylene)
Printing inks, paint removers, varnishes, etc.
Hydrochloric acid
Cements and glues
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
If indoor air is to be used for combustion, it must be free of
the following substances or the life of the heat exchanger
will be adversely affected: chlorine, carbon tetrachloride,
cleaning solvent, halogen refrigerants, acids, cements and
glues, printing inks, fluorides, paint removers, varnishes,
or any other corrosives.
Rotation of Combustion Air Inducer (UHCM-125 & 150 Only)
The combustion air inducer on UHCM-125 & 150 may
be rotated 90° either to the left or right of the original
vertical position in order to better suit the application.
NOTE - It is not permissible to rotate the combustion
air inducer on UHRS-030/105 and -175/400.
Rotate the combustion air inducer assembly as follows:
1 - Remove the heater from the carton. Decide the best
unit heater orientation. The vent can be installed in
one of three discharge positions: up, left, or right.
2 - If the inducer is to be rotated, follow the instructions
in this section; otherwise, refer to instructions under
“Venting” section.
3 - Before making an electrical or gas connections, use
a socket to remove the four screws which secure the
combustion air inducer to the flue box. See figure 3.
4 - Rotate the inducer 90° to the desired position.
Reinsert and tighten the inducer securing screws.
5 - The unit heater is now ready for installation as
described in the Venting section.
FLUE BOX AND COMBUSTION AIR
INDUCER ASSEMBLY
125/150
FLUE BOX
FLUE BOX
GASKET
ORIFICE
PLATE
VEST PANEL
ORIFICE
PLATE GASKET
COMBUSTION
AIR INDUCER
FIGURE 3
NOTE - Local codes may supersede any of these provisions.
GENERAL RECOMMENDATIONS AND
REQUIREMENTS
Unit heaters must be vented in compliance with the lat-
est edition of the National Fuel Gas Code (NFPA 54 /
ANSI Z223.1) in the USA and with CSA-B149.1 codes in
Canada, as well as applicable provisions of local building
codes, and the following instructions.
Vent piping must be in compliance with UL 1738 for
installations in the United States, and ULC S636 for
installations in Canada. Refer to venting sections for
vent termination clearance requirements.
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030-150 Units - The transition is a part of the combus-
tion air blower.
175-400 Units - A sheet metal transition is supplied
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tered and must be installed on the outlet of the com-
bustion air inducer assembly prior to the installation
of the vent connector. Failure to comply with this re-
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approval agencies.
A single-wall vent connector may be used between the
furnace and the vertical vent pipe in all applications; how-
ever, single-wall vent material cannot be used for
vertical vent piping in residential applications. UL-ap-
proved Category III venting materials must be used
in all residential applications which vent horizontally.
Venting
NOTE - The vent is a passageway, vertical or nearly so,
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connector, to the outside atmosphere. The vent connector
is the pipe or duct that connects a fuel-gas-burning appli-
ance to a vent or chimney.

Page 12
A single-wall vent pipe used as a vent connector in resi-
dential or commercial applications, or as a vertical vent in
commercial applications, must have all seams and joints
sealed with pressure-sensitive aluminum tape or silicone
rubber sealant. The aluminum tape must have a
temperature rating of 400°F (204°C) i.e., 3M 433 or
equivalent. Silicone rubber sealant must have a
temperature rating of 482°F (250°C), i.e., Dow Corning
RTV-736 or equivalent. All joints must be secured with at
least two corrosion-resistant screws. All joints must be
checked for gas tightness after installation. Single-wall
vent pipe used as vertical vent in commercial
applications must not pass through any attic, interior wall,
concealed space, or floor.
9(57,&$/ 9(176 86,1* 0(7$/ 9(17 3,3( 
&200(5&,$/$1'5(6,'(17,$/,167$//$7,216
These compact unit heaters are listed as Category 1
appliances for vertical vent installations.
1 - These unit heaters are to be used with NFPA- or
ANSI-approved chimneys or U.L.-listed type B-1
gas vents, or listed chimney lining systems for gas
venting where applicable, as well as the modifications
and limitations listed in figure 3. Seal single-wall vent
material according to *HQHUDO 5HFRPPHQGDWLRQV
DQG5HTXLUHPHQWVsection.
2 - The vent connector shall be 4” (102mm) diameter
on 30, 45, 60, 75, 090, 105, 125, and 150
Btuh
units; 5” (127mm) diameter on 175, 200, 250,
& 300 Btuh units; 6” (152mm) on 360 & 400 Btuh
units. On 175-400 units, a flue transition piece
(supplied) is required to fit over the outlet of the
induced draft assembly on the appliance.
127(  If needed, loosen the upper right two or three
screws securing the combustion air blower. Slide the tran-
sition into place and secure loosened screws.
3 - eep the vent connector runs as short as possible
with a minimum number of elbows. Refer to the
current edition of ANSI Z223.1 or CSA-B149
installation compliance codes for maximum vent and
vent connector lengths.
4 - The entire length of a single-wall metal vent connector
shall be readily accessible for inspection, cleaning
and replacement.
5 - Single-wall vent pipe used as vertical vent in
commercial applications must not pass through any
attic, interior wall, concealed space, or floor.
7$%/(
0$;,080+25,=217$/9(17&211(&725$1'
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No. of
Elbows
30, 45, 60, 75, 90, 105, 125,
150, 175, 200, 350, 400 250 & 300
ft m ft m
1 25 7.6 35 10.7
2 20 6.1 30 9.1
3 15 4.6 25 7.6
4 10 3.0 20 6.1
5 5 1.5 15 4.6
6 - - 10 3.0
7 - - 5 1.5

Page 13
6 - The unit may be vented vertically as a single appliance
or in a common vent with other gas-fired appliances.
In common venting situations, vent connectors for
other appliances must maintain a 4” (102mm) vertical
separation between the vent connectors. Refer to
common venting tables in the current editions of
ANSI Z223.1 or CSA-B149 installation compliance
codes for proper vent size.
7 - Clearance to combustible material is 6” (152mm)
for single-wall vent material except where a listed
clearance thimble is used. Clearance to combustible
material for type B-1 vent or factory-built chimney is
per manufacturer’s instructions.
8 - The vent connector shall be supported without any
dips or sags. Vertical vents shall be supported in
accordance with their listing and manufacturers’
instructions. All horizontal vent connector runs shall
have a slope up to the vertical vent of at least 1/4”
per foot (1mm per 50mm).
9 - All vertical type B-1 vents, single-wall vertical vents
(commercial applications), or listed chimney lining
systems must be terminated with a UL-listed (or other
equivalent agency) vent cap or listed roof assembly.
10- The vent must extend at least 3 feet (1m) above
the highest point where it passes through a roof
of a building. The vent must also extend at least 2
feet (1m) higher than any part of a building within a
horizontal distance of 10 feet (3m) unless otherwise
specified by ANSI Z223.1 or CSA-B149 installation
compliance codes. The vent must extend at least 5
feet (2m) above the highest connected equipment
flue collar
+25,=217$/9(17,1*
127(&RPPRQYHQWLQJLVQRWDOORZHGZKHQKRUL]RQWDOO\
YHQWLQJWKHXQLWKHDWHU
127(  3UHFDXWLRQV PXVW EH WDNHQ WR SUHYHQW
GHJUDGDWLRQRIEXLOGLQJPDWHULDOVE\IOXHSURGXFWV
If the UH(RS,CM) unit heater is to be horizontally vented,
a positive pressure may be created in the vent. The unit
heater, when installed with horizontal venting, will perform
as a category III appliance.
1 - In residential applications which vent horizontally,
use only special vent materials approved for use
with Category III appliances.
2 - The vent pipe diameter for horizontal installations
shall be 4” (102mm) diameter on 30, 45, 60,
75, 090, 105, 125, and 150 Btuh units; 5”
(127mm) diameter on 175, 200, 250, & 300
Btuh units; 6” (152mm) on 350 & 400 Btuh units.
On 175-400 units, a flue transition piece (supplied)
is required to fit over the outlet of the induced draft
assembly on the appliance.
3 - The minimum horizontal vent length is 5 feet (2m).
4 - Refer to table 3 for maximum horizontal vent lengths.
5 - If possible, do not terminate the horizontal vent
through a wall that is exposed to prevailing wind.
Exposure to excessive winds can affect unit
performance. If such a termination is necessary, use
a wind block to protect the vent termination from
direct winds.
6 - Horizontal vent termination must be free from
obstructions and at least 12” (305mm) above grade
level and maximum snow height.
7 - Do not install a horizontal vent termination directly
below roof eaves or above a public walkway, or
any other area where condensate dripping may be
troublesome and may cause some staining. Avoid
windows where steam may cause fogging or ice
buildup.
8 - Minimum clearance for horizontal vent termination
from any door, window, non-mechanical air supply
inlet is 4 feet below or to the side of opening; 1 foot
above opening horizontally for United States
installations. In Canada, minimum clearance for
horizontal vent termination from any door, window,
non-mechanical air supply inlet or the combustion
air inlet to any other appliance is 12 inches for
appliances 10,000 to 100,000 Btuh, and 36 inches
for appliance 100,000 Btuh.
Refer to latest editions of the ANSI Z223.1 or CSA-B149
for installation compliance codes and with local author-
ities with jurisdiction.
9 - Vent terminal clearance to each side of a centerline
extended above a meter/regulator assembly and
service regulator vent outlet must be in accordance
with local installation codes and the requirements of
the gas supplier for installations in the United
States. In Canada the clearance to each side of a
centerline extended above meter/regulator
assembly and service regulator vent outlet must be
3 feet(1m) within a height 15 feet above the
meter/regulator assembly and 3 feet to a service
regulator vent.
10 - Vent termination clearance to an unvented soffit
or within 2 feet horizontally of a ventilated soffit
must be in accordance with local installation codes
and the requirements of the gas supplier.
11 - When a vent termination is inside a corner formed
by two exterior walls the clearance must be in
accordance with local installation codes and the
requirements of the gas supplier.
12 - Vent termination must be a minimum of 3
feet(1m) above any forced air inlet (includes fresh
air inlet for other appliance, such as a dryer) if
within 10 feet horizontally for United States
installations. In Canada, vent termination must have
6 feet (2m) minimum clearance to a mechanical air-
supply inlet of any building.- All horizontal vents
which use special vent pipe for use with Category III
appliances must terminate with an approved
Category III tee. Opening end must face downward.
13 - When termination is routed through combustible
wall, vent termination must be supported using a
firestop to maintain clearances specified on unit
rating plate. Inside edge of vent termination must be
at least 16” (406mm) from outside wall.
14 - All horizontal vents which use special vent pipe
for use with Category III appliances must terminate
with an approved Category III tee. Opening end
must face downward.
15 For horizontal venting, the vent pipe shall be
supported with hangers no more than 3 feet. (1m)

Page 14
apart to prevent movement after installation.
16 - Select a wall termination point that will maintain
1/4” (6mm) rise per foot (305mm) slope of horizontal
run of vent pipe.
17 - For upward sloped vent, a condensate tee and
drain must be installed within the first 5 feet (2m) from
the unit heater to protect the appliance. If a flexible
condensate drain line is used, the drain line must
include a loop filled with water to prevent combustion
products from entering the structure. If the unit is shut
down for an extended period of time and will be
exposed to sub-freezing temperatures, the
condensate may freeze.
18 - Select a wall termination point that will maintain
1/4” rise per foot slope of horizontal run of vent pipe.
In areas where authorities having jurisdiction permit, a
downward slope of maximum 1/4” per foot is also
acceptable. Condensate drainage can be collected in
a tee pipe section (figure 4) with drain loop similar to
one used for upward slope vent, or allowed to drip
through the vent termination, if permitted by
authorities (figure 6).

Page 15

Page 16
8. - If B-1 vent or an insulated flexible vent pipe cannot be
used as liners, the chimney must be rebuilt to
accommodate one of these methods or some alternate
approved method must be found to vent the appliance.
When inspection reveals that an existing chimney is not
safe for the intended purpose, it shall be rebuilt to conform
to nationally recognized standards, lined or relined with
suitable materials or replaced with a gas vent or chimney
suitable for venting unit heaters. The chimney passageway
must be checked periodically to ensure that it is clear and
free of obstructions.
2 REMOVAL OF UNIT FROM COMMON
VENT
In the event that an existing unit heater is removed from a
venting system commonly run with separate gas applianc-
es, the venting system is likely to be too large to properly
vent the remaining attached appliances. The following test
should be conducted while each appliance is in operation
and the other appliances are not in operation, yet remain
connected to the common venting system. If the venting
system has been installed improperly, the system must be
corrected.
1 - Seal any unused openings in the common venting
system.
2 - Visually inspect the venting system for proper size and
horizontal pitch. Determine there is no blockage or
restriction, leakage, corrosion, or other deficiencies
which could cause an unsafe condition.
3 - In so far as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the common
venting system are located and other spaces of the
building. Turn on clothes dryers and any appliances
not connected to the common venting system. Turn
on any exhaust fans, such as range hoods and
bathroom exhausts, so they will operate at maximum
speed. Do not operate a summer exhaust fan. Close
fireplace dampers.
4 - Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
appliance will operate continuously.
5 - Test for spillage at the draft hood relief opening after
five minutes of main burner operation. Use the flame
of a match or candle, or smoke from a cigarette,
cigar, or pipe.
6 - After it has been determined that each appliance
remaining connected to the common venting system
properly vents when tested as outlined above, return
doors, windows, exhaust fans, fireplace dampers
and any other gas-burning appliance to their previous
condition of use.
7 - If improper venting is observed during any of the above
tests, the common venting system must be corrected.
The common venting system should be resized to ap-
proach the minimum size as determined by using the
appropriate tables in Appendix G in the current editions
of the ANSI Z223-1, or the appropriate Category I Nat-
ural Gas and Propane appliances venting sizing tables
in the current standards of the CSA-B149 for installa-
tion compliance codes.
NOTE - Local codes may supersede any of the provisions
outlined in this instruction.
These unit heaters use a direct spark ignition system.
There is no pilot necessary as the spark lights the main
burner when the gas valve is turned on. The direct spark
ignition control board (A3) emits radio noise as the
sparking process is under way. The level of energy may
be sufficient to disturb a logic circuit in a microprocessor
controlled thermostat. It is recommended that an isolation
relay be used when connecting the unit heaters to a
microprocessor controlled thermostat.
250-400 Units Only: Units are shipped from the factory in
two-stage heating mode. When using a single-stage
thermostat or control, jumper W1 & W2 terminals on
P367 5-pin thermostat plug.
Install the thermostat according to instructions provided.
Route thermostat wiring through knockout on the power
entry box located on the side of the unit heater. Refer to
dimensions in the front of this instruction for location. Use
18 gauge wire or larger for thermostat connections.
Connect thermostat wires to 5-pin P367 thermostat plug
located on the A3 ignition control board. See figure 7. For
ease of installation, disconnect P367 plug from J367,
make wire connections, and replace P367. Refer to
diagram on unit and appropriate diagram in this
instruction.
An additional thermostat wire must be run to terminal “G”
on heater when continuous blower is desired.
(OHFWULFDO&RQQHFWLRQV

Page 17
/,1(92/7$*(:,5,1*
1 - Install a separate fused disconnect switch
with the fuse sized according to the blower
motor size.
NOTE - Electrically ground unit in accordance
with local codes or, in the absence of local
codes, in accordance with the current editions of
the ANSI/NFPA No. 70, National Electrical Code
or CSA C22.1, Canadian Electrical Code, Part 1.
NOTE - Uninsulated ground wires must be
wrapped in electrical tape to avoid damage to
the electrical system.
2 - Make line voltage connections as shown in
figure 8. On 030-105 units, use pigtails provided
in power entry box. On 125-400 units, connect
wires to 2-pin P366 plug located on the A3
ignition control board. For ease of installation,
disconnect P366 plug from J366, make wire
connections, and replace P366. Refer to wiring
diagram on unit and the appropriate typical
diagram in this manual.

Page 18
Rev: 0.0
Heat Input - 030k-105k BTUH
Supersedes: 537992-01 Form No:
Model: 6)34Unit Heater; 6)4$Separated Combustion Unit Heater
Voltage: 120/60/1
02
03
04
05
06
07
08
01
AA BB CC
DD EE
FF
6
GV- M
SPARK
COM
M
GRY WH T WH T WH T WH T WH T BLU BLU PNK BRN
S10
4
S18
8
S47
7
S195
9
S10
5
S18
11
GV- C
12
GV- H
2
S47
1
S195
3
NO COM
2
FAN1- N
5
F AN1 - GND
8
FAN1- L1
2
FAN2- N
5
F AN2 - GND
8
FAN2- L1
GR N- YE L
WH T BLK
FLAME SENS
GRY
GND
GND- Groundi ng Poi nt
W2
L1
G
W1
5XFMR- COM
6XFMR- 24VAC
3XFMR- N
1XFMR- L1
2
1
R
C
N
WH T - R E D
4
CAI - N
1
CAI - L 1
WH T BLK
BLK
WH T
BLU
YEL
COMP- 001
GND- Groundi ng Poi nt
4GND- BOARD
GR N- YE L
BLK
WH T
GR N- YE L
WH T BLK
P19 J 19
RED
3311
COM NO
WH T
WH T
WH T
537992-02
0.0
537992-02
HI GH VOLTAGE POWER CONNECTI ONS IGN CTRL
A3
1
FACTORY I NSTALLED POWER
WI R I N G
LOW VOLTAGE THERMOSTAT CONNECTI ONS
HE AT ( W1 )
39
24VAC- I N
P368
1
J368 7548111262
P364 P365
P363
L1
P367 J367
1
3
5
6
R
2 4 V C O MMO N ( C )
24V POWER ( R)
BLOWER ( G) G
C
P366
W2
W1
N
GND
J 366
-OUT
24VAC- I N
-OUT -OUT
24VAC- I N
FAC RUN TEST
P373
L1
N
J 363
41
GND WI R E
AT T ACHE D T O
X F MR MO U N T I N G
SCREW
J 374
P374
4
FI ELD PROVI DED
CL AS S I I 2 4 VAC
THERMOSTAT WI RI NG
FI ELD PROVI DED
POWER WIRING.
MAKE FI ELD POWER
CONNE CT I ONS I N
POWER ENTRY BOX.
!
P365 AND P364
AR E E NE RGI Z E D
SI MULTANEOUSLY
2

Page 19
Rev: 1.0
Heat Input - 125k-200k BTUH
Supersedes: 538025-01 Form No:
Model: 6)$.Unit Heater; 6)4$Separated Combustion Unit Heater
Voltage: 120/60/1
02
03
04
05
06
07
08
01
AA BB CC
DD EE
FF
6
GV- M
SPARK
COM
M
BLU BLU PNK BRN
S10
4
S18
8
S47
7
S195
9
S10
5
S18
11
GV- C
12
GV- H
2
S47
1
S195
3
NO COM
2
FAN1- N
5
F AN1 - GND
8
FAN1- L1
2
FAN2- N
5
F AN2 - GND
8
FAN2- L1
GR N- Y E L
WH T BLK
FLAME SENS
GRY
GND
GND- Groundi ng P oi nt
W2
L1
G
W1
5XFMR- COM
6XFMR- 24VAC
3XFMR- N
1XFMR- L1
WH T
2
1
R
C
N
WH T - R E D
4
CAI - N
1
CAI - L 1
WH T BLK
BLK
WH T
BLU
YEL
COMP- 001
GND- Groundi ng P oi nt
4GND- BOARD
GR N- YE L
BLK
WH T
GR N- YE L
WH T WH T GRY WH T
538025-02
1.0
538025-02
HI GH VOL T AGE POWE R CONNE CT I ONS IGN CTRL
A3
1
L OW VOL T AGE T HE RMOS T AT CONNE CT I ONS
HE AT ( W1 )
39
24VAC- I N
P368
1
J 368 7548111262
P364 P365
P363
L1
P367 J367
1
3
5
6
R
2 4 V C O MMO N ( C )
24V POWER ( R)
BLOWER ( G) G
C
P366
W2
W1
N
GND
J 366
-OUT
24VAC- I N
-OUT -OUT
24VAC- I N
FAC RUN TEST
P373
L1
N
J 363
41
GND WI R E
AT T ACHE D T O
X F MR MO U N T I N G
SCREW
J374
P374
4
FI ELD PROVI DED
CL AS S I I 2 4 VAC
THERMOSTAT WI RI NG
FIELDPROVIDEDPOWER WIRING.
C ONNE C T T O P 3 6 6 AND GR E E N GR OUND
SCREW LOCATED I NSI DE UNI T.
!
P365 AND P364
AR E E NE RGI Z E D
SI MULTANEOUSLY

Page 20
Rev: 1.0
Heat Input - 250k-400k BTUH
Supersedes: 538024-01 Form No:
Model: 6)$.Unit Heater; 6)4$Separated Combustion Unit Heater
Voltage: 120/60/1
02
03
04
05
06
07
08
01
AA BB CC
DD EE
FF
6
GV- M
SPARK
COM
M
BLU
BLU
BLU PNK BRN
S10
4
S18
8
S47
7
S195
9
S10
5
S18
11
GV- C
12
GV- H
2
S47
1
S195
3
NO COM
2
FAN1- N
5
F AN1 - GND
8
FAN1- L1
2
FAN2- N
5
F AN2 - GND
8
FAN2- L1
GR N- Y E L
WH T BLK WH T
GR N- Y E L
BLK
FLAME SENS
GRY
GND
GND- Groundi ng Poi nt
W2
L1
G
W1
5XFMR- COM
6XFMR- 24VAC
3XFMR- N
1XFMR- L1
HI
2
1
R
C
N
WH T - R E D
4
CAI - N
1
CAI - L 1
WH T BLK
BLK
WH T
BLU
YEL
COMP- 001
GND- Groundi ng P oi nt
4GND- BOARD
GR N- YE L
BLK
WH T
GR N- YE L
WH T
WH T WH T
GRY WH T
BRN
538024-02
1.0
538024-02 IGN CTRL
A3
1
FIELDPROVIDEDPOWER WIRING.
C ONNE C T T O P 3 6 6 A ND GR E E N GR OUND
SCREW LOCATED I NSI DE UNI T.
LOW VOLTAGE THERMOSTAT CONNECTI ONS
HE AT ( W2 )
HE AT ( W1 )
39
24VAC- I N
P368
1
J368 7548111262
P364 P365
P363
L1
P367 J367
1
3
5
6
R
2 4 V C O MMO N ( C )
24V POWER ( R)
BLOWER ( G) G
C
P366
W2
W1
N
GND
FI ELD PROVI DED
CL AS S I I 2 4 VAC
THERMOSTAT WI RI NG
J 366
-OUT
24VAC- I N
-OUT -OUT
24VAC- I N
FAC RUN TEST
P373
L1
N
J363
41
GND WI R E
AT T ACHE D T O
X F MR MO U N T I N G
SCREW
J374
P374
4
HI GH VOLTAGE POWER CONNECTI ONS