Reznor UDAP Guide

Form I-UDA, P/N 195673 Rev 13, Page 1
Applies to: Model UDAP
and Model UDAS
�
Series Fan-Type
Unit Heaters
FORM I-UDA (Version A)
Obsoletes Form I-UDA
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Installation/Operation
FOR YOUR SAFETY
What to do if you smell gas:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions.
• Ifyoucannotreachyourgassupplier,callyourredepartment.
FOR YOUR SAFETY
Donotstoreorusegasolineorotherammablevaporsandliquidsinthevicinity
of this or any other appliance.
WARNING:
Improper installation, adjustment, alteration, service, or maintenance can cause
property damage, injury, or death. Read the installation, operation, and maintenance
instructionsthoroughlybeforeinstallingorservicingthisequipment.

Form I-UDA, P/N 195673 Rev 13, Page 2
HAZARD INTENSITY LEVELS
1. DANGER: Failure to comply will result in severe personal injury or death
and/or property damage.
2. WARNING: Failure to comply could result in severe personal injury or
death and/or property damage.
3. CAUTION: Failure to comply could result in minor personal injury and/or
property damage.
WARNING: Gas-red appliances are not designed for use
in hazardous atmospheres containing ammable vapors or
combustible dust, in atmospheres containing chlorinated or
halogenated hydrocarbons, or in applications with airborne
silicone substances. See Hazard Levels, above.
WARNING: Should overheating occur, or the gas supply fail
to shut off, shut off the manual gas valve to the appliance
before shutting off the electrical supply.
1. General 1.1 Hazard Labels and Notices
There are warning labels on the unit and throughout this manual. For your safety, read
the denitions below and comply with all boxes labeled CAUTION, WARNING, and
DANGER during installation, operation, maintenance, and service of this heater.
DenitionsofHazardIntensityLevelsinthisManual
Contents
1. General ....................................................... 2-4
1.1 Hazard Labels and Notices ............................ 2
1.2 General Installation Information.................... 3
1.3 Warranty .......................................................... 4
1.4 Installation Codes........................................... 4
2. Unit Heater Location.................................. 4-6
2.1 Heater Throw .................................................. 4
2.2 Location Recommendations.......................... 5
3. Uncrating and Preparation........................ 6-7
3.1 Uncrating and Inspecting............................... 6
3.2 Preparing for Installation ............................... 6
4. Clearances and Dimensions .................... 7-9
4.1 Clearances....................................................... 7
4.2 Dimensions ..................................................... 8
5. Hanging the Heater................................ 10-11
5.1 Weights.......................................................... 10
5.2 Lifting and Suspending................................ 10
6. Mechanical ............................................. 11-16
6.1 Gas Piping and Pressures ............................11
6.2 Combustion Air - UDAP and UDAP-CV....... 16
7. Electrical Supply and Wiring ................ 16-22
7.1 General .......................................................... 16
7.2 Supply Wiring................................................ 17
7.3 24V Control Wiring Connections................. 17
7.4 Wiring Diagrams ........................................... 18
7.5 Electrical Operating Components............... 21
8. Controls and Operation......................... 22-26
8.1 Thermostat .................................................... 22
8.2 DDC Controls, Options D10 and D14 .......... 23
8.3 Ignition System ............................................. 24
9. Commissioning and Startup................. 27-29
9.1 Check the installation prior to startup:....... 27
9.2 Heater Startup:.............................................. 27
9.3 Check installation after startup:.................. 28
10. Maintenance and Service.................... 29-37
10.1 Maintenance Schedule ............................... 29
10.2 Maintenance Procedures ........................... 30
10.3. Troubleshooting ........................................ 35
APPENDIX ....................................................... 38
INDEX............................................................... 39

Form I-UDA, P/N 195673 Rev 13, Page 3
1.2.1 Certication
Model UDAP 30, 45, 60, 75, 100, and 125 and Model UDAS 30, 45, 60, 75, 100, and
125 are design certied by the Canadian Standards Association for use in residential,
industrial, and commercial installations. Unit heaters certied for “residential use” are
intended to be used as supplementary heating devices in residential areas such as
workshops and garages. They are not intended to be the primary source of heat in
residential applications or to be used in sleeping quarters. Residential standards are
CSA CR-96-0005 and International Requirement 10.96.
Models UDAP 150, 175, 200, 225, 250, 300, 350, and 400 and UDAS 150, 175, 200,
225, 250, 300, 350, and 400 are design certied by the Canadian Standards Associa-
tion for use in industrial and commercial installations only.
All models and sizes are available for use with either natural or propane gas. The type
of gas, the gas input rate, and the electrical supply requirement are shown on the
heater rating plate. Check the rating plate to verify that the heater is appropriate for the
installation site.
1.2.2 Venting Manual
Installation requires both this manual AND the venting manual.
Venting Manual by Model
BOTH this manual
and the correct
venting manual
are REQUIRED for
installation of this
heater.
1.2 General
Installation
Information
WARNING: Do not use this appliance if any part has been
underwater.Immediatelycallaqualiedservicetechnician
to inspect the appliance and replace any gas control that has
been under water.
Model Venting Instruction Manual by
Form No.
Look for Matching Label on
Venting Manual and Heater
UDAP Form I-UD-V-PV,
Standard Power Vent Installation
(Each heater has its own dedi-
cated vent.)
Label with RED SQUARE
UDAP-CV Form I-UD-V-CV,
Optional Common Vent Installa-
tion (Model UDAP heater must be
equipped with Option AV6.)
Label with BLUE TRIANGLE
Note: Model UDAP-CV is available in Sizes 30, 45, 60, 75, 100 only
UDAS Form I-UD-V-SC,
Separated Combustion (Model
UDAS requires eld installation of
either Option CC2, CC6, or CC14
Vent/Combustion Air Kit)
Label with GREEN CIRCLE
Both this installation manual and the appropriate venting manual are shipped with the
heater. Verify that the literature is correct for the heater being installed. If either manual
is missing or incorrect, contact your distributor before beginning installation.
The instructions in this manual apply only to the models listed.
Installation should be done by a qualied agency in accordance with these instructions.
The qualied service agency installing this heater is responsible for the installation.

Form I-UDA, P/N 195673 Rev 13, Page 4
Special Installations
(Aircraft Hangars/
Repair Garages/Parking
Garages)
1.3 Warranty
Refer to the limited warranty information on the Warranty Card in the “Literature Bag”.
Warranty is void if ...
a. Wiring is not in accordance with the diagram furnished with the heater.
b. The unit is installed without proper clearance to combustible materials.
c. A fan model is connected to a duct system or if the air delivery system is
modied.
California Warning
Label
Massachusetts
Requirement
1. General (cont’d)
1.4 Installation
Codes
These units must be installed in accordance with local building codes. In the absence
of local codes, in the United States, the unit must be installed in accordance with
the National Fuel Gas Code, ANSI Z223.1. A Canadian installation must be in accor-
dance with the CSA B149 Installation Codes. These codes are available from CSA
Information Services, 1-800-463-6727. Local authorities having jurisdiction should be
consulted before installation is made to verify local codes and installation procedure
requirements.
Installations in aircraft hangars should be in accordance with ANSI/NFPA No. 409 (lat-
est edition), Standard for Aircraft Hangars; in public garages in accordance with ANSI/
NFPA No. 88A (latest edition), Standard for Parking Structures; and for repair garages
in accordance with ANSI/NFPA No. 88B (latest edition), Standard for Repair Garages.
In Canada, installations in aircraft hangars should be in accordance with the require-
ments of the enforcing authorities, and in public garages in accordance with CSA B149
codes.
If the heater is being installed in the state of California, the installer MUST attach
a warning label on the outside of the access door. The California Warning label is
shipped in the literature bag along with this manual, the warranty form, and any other
paperwork that applies.
If installation is in California, select a location on the heater access panel. Be sure the
surface is clean and dry and adhere the label.
If the heater is being installed in the Commonwealth of Massachusetts, these units
must be installed by a licensed plumber or licensed gas tter.
FIGURE 1 - Throw for
Fan Models UDAP and
UDAS
2. Unit Heater
Location
2.1 Heater Throw
Use the sound data in Technical Data table in the APPENDIX (page 38), clearances
in Paragraph 4.1; the combustion air requirements in Paragraph 6.2; the throw tables,
mounting height requirements, and location recommendations in Paragraphs 2.1 and
2.2; the weights in Paragraph 5.1; and the venting requirements in the Venting Manual
to determine where to suspend the heater.
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NOTE: Throws listed are with standard adjustable horizontal louvers at the angles
listed (angle is relative to the top of the heater). Throw pattern changes with the addi-
tion of optional vertical louvers and/or downturn nozzles.

Form I-UDA, P/N 195673 Rev 13, Page 5
Locate the heater so that it is a minimum of ve feet (1.5M) above the oor and in
compliance with the clearances in Paragraph 4.1.
WARNING: If touched, the vent pipe and internal heater surfaces
that are accessible from outside the heater will cause burns. Sus-
pendtheheateraminimumof5feet(1.5M)abovetheoor.
For best results, the heater should be placed with certain rules in mind. In general, a
unit should be located from 8 to 12 feet (2.4-3.7M) above the oor. Units should always
be arranged to blow toward or along exposed wall surfaces, if possible. Where two or
more units are installed in the same room, a general scheme of air circulation should
be maintained for best results.
Suspended heaters are most effective when located as close to the working zone as
possible, and this fact should be kept in mind when determining the mounting heights
to be used. However, care should be exercised to avoid directing the discharged air
directly on the room occupants.
Partitions, columns, counters, or other obstructions should be taken into consideration
when locating the unit heater so that a minimum quantity of airow will be deected by
such obstacles.
When units are located in the center of the space to be heated, the air should be dis-
charged toward the exposed walls. In large areas, units should be located to discharge
2.2 Location Recommendations
Dimensions X, Y, and Z (feet) Model UDAP and Model UDAS with Standard Horizontal Louvers at Mounting Heights of 5 - 18 ft
H
30 45 60 75 100 125
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
5 ft 6 14 30 -21° 7 16 40 -20° 8 18 45 -16° 920 57 -14° 920 59 -18° 10 22 65 -14°
8 ft 7 13 26 -39° 9 16 37 -34° 10 18 42 -29° 12 22 54 -25° 11 21 56 -28° 12 23 63 -24°
10 ft 6 11 22 -52° 915 33 -43° 10 17 39 -37° 12 22 52 -32° 12 20 52 -36° 13 24 60 -30°
12 ft - - - - 812 27 -55° 10 16 34 -46° 12 21 48 -39° 11 19 47 -44° 14 23 57 -36°
14 ft - - - - - - - - 914 29 -56° 12 19 44 -46° 11 17 42 -51° 14 22 53 -43°
16 ft - - - - - - - - - - - - 11 17 38 -54° 10 14 34 -58° 13 20 47 -50°
18 ft - - - - - - - - - - - - - - - - - - - - 11 17 40 -57°
H
150 175 200 225 250 300 350 400
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
8 ft 13 24 73 -26° 15 28 90 -22° 16 30 93 -20° 14 27 86 -24° 16 29 93 -21° 15 28 94 -24° 17 31 105 -20° 18 34 113 -17°
10 ft 14 24 69 -32° 17 29 87 -27° 17 31 91 -25° 15 27 82 -30° 17 30 90 -26° 16 28 89 -29° 18 32 103 -25° 20 35 110 -21°
12 ft 14 24 64 -39° 18 29 84 -32° 18 31 88 -30° 16 27 78 -35° 18 30 87 -31° 17 28 85 -34° 19 32 98 -30° 21 36 108 -25°
14 ft 14 22 59 -45° 18 28 79 -37° 19 30 84 -34° 16 26 73 -41° 18 30 83 -36° 17 27 80 -40° 20 32 95 -34° 23 35 105 -29°
16 ft 13 20 53 -51° 18 27 74 -42° 19 29 79 -39° 16 24 67 -47° 19 28 78 -41° 17 25 74 -45° 21 31 90 -38° 23 35 101 -33°
18 ft 11 17 44 -58° 17 26 68 -48° 19 28 74 -44° 14 22 60 -53° 18 27 72 -46° 16 24 66 -51° 20 30 85 -43° 23 35 97 -37°
Dimensions X, Y, and Z (meters) Model UDAP and Model UDAS with Standard Horizontal Louvers at Mounting Heights of 1.5 - 5.5M
H
30 45 60 75 100 125
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
1.5 M 1.8 4.3 9.1 -21° 2.1 4.9 12.2 -20° 2.4 5.5 13.8 -16° 2.7 6.1 17.4 -14° 2.7 6.1 18.0 -18° 3.0 6.7 19.9 -14°
2.4 M 2.1 4.0 7.9 -39° 2.7 4.9 11.3 -34° 3.0 5.5 12.8 -29° 3.7 6.7 16.5 -25° 3.4 6.4 17.1 -28° 3.7 7.0 19.2 -24°
3.0 M 1.8 3.4 6.7 -52° 2.7 4.6 10.0 -43° 3.0 5.2 11.9 -37° 3.7 6.7 15.8 -32° 3.7 6.1 15.8 -36° 4.0 7.3 18.3 -30°
3.7 M - - - - 2.4 3.7 8.2 -55° 3.0 4.9 10.4 -46° 3.7 6.4 14.6 -39° 3.4 5.8 14.3 -44° 4.3 7.0 17.4 -36°
4.3 M - - - - - - - - 2.7 4.3 8.8 -56° 3.7 5.8 13.4 -46° 3.4 5.2 12.8 -51° 4.3 6.7 16.1 -43°
4.9 M - - - - - - - - - - - - 3.4 5.2 11.6 -54° 3.0 4.3 10.4 -58° 4.0 6.1 14.3 -50°
5.5 M - - - - - - - - - - - - - - - - - - - - 3.4 5.2 12.2 -57°
H
150 175 200 225 250 300 350 400
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
X Y Z
Louver
Angle*
2.4 M 4.0 7.3 22.3 -26° 4.6 8.5 27.4 -22° 4.9 9.1 28.0 -20° 4.3 8.2 26.2 -24° 4.9 8.8 28.3 -21° 4.6 8.5 28.7 -24° 5.2 9.4 32.0 -20° 5.5 11.3 34.4 -17°
3.0 M 4.3 7.3 21.0 -32° 5.2 8.8 26.6 -27° 5.2 9.4 27.7 -25° 4.6 8.2 25.0 -30° 5.2 9.1 27.4 -26° 4.9 8.5 27.1 -29° 5.5 9.8 31.4 -25° 6.1 10.7 33.5 -21°
3.7 M 4.3 7.3 19.5 -39° 5.5 8.8 25.6 -32° 5.5 9.4 26.8 -30° 4.9 8.2 23.8 -35° 5.5 9.1 26.5 -31° 5.2 8.5 25.9 -34° 5.8 9.8 29.9 -30° 6.4 11.0 32.9 -25°
4.3 M 4.3 6.7 18.0 -45° 5.5 8.5 24.1 -37° 5.8 9.1 25.6 -34° 4.9 7.9 22.3 -41° 5.5 9.1 25.3 -36° 5.2 8.2 24.4 -40° 6.1 9.8 29.0 -34° 7.0 10.7 32.0 -29°
4.9 M 4.0 6.1 16.2 -51° 5.5 8.2 22.6 -42° 5.8 8.8 24.1 -39° 4.9 7.3 20.4 -47° 5.8 8.5 23.8 -41° 5.2 7.6 22.6 -45° 6.4 9.4 27.4 -38° 7.0 10.7 30.8 -33°
5.5 M 3.4 5.2 13.4 -58° 5.2 7.9 20.7 -48° 5.8 8.5 22.6 -44° 4.3 6.7 18.3 -53° 5.5 8.2 21.9 -46° 4.9 7.3 20.1 -51° 6.1 9.1 25.9 -43° 7.0 10.7 26.9 -37°
NOTE: Venting
requirementsmay
affect location.
Consult the Venting
Manual for this heater
beforemakingnal
determination.

Form I-UDA, P/N 195673 Rev 13, Page 6
Hazards of Chlorine
- applies to location
of Model UDAS
heater with regard to
combustion air inlet
air along exposed walls with extra units provided to discharge air in toward the center
of the area.
At those points where inltration of cold air is excessive, such as at entrance doors and
shipping doors, it is desirable to locate the unit so that it will discharge directly toward
the source of cold air from a distance of 15 to 20 feet (4.6-6.1M).
CAUTION: Do not locate the heater where it may be exposed to
water spray, rain, or dripping water.
For a location where dirt, dust, or other airborne contaminants are present in the indoor
environment, it is recommended to install a separated-combustion unit, Model UDAS,
that uses outside air for combustion. Using a separated-combustion unit will reduce the
build-up of contaminants on the burner. Any buildup on the burner will adversely affect
the combustion process.
The presence of chlorine vapors in the combustion air of gas-red heating equipment
presents a potential corrosion hazard. Chlorine found usually in the form of freon or
degreaser vapors, when exposed to ame will precipitate from the compound, and go
into solution with any condensation that is present in the heat exchanger or associated
parts. The result is hydrochloric acid which readily attacks all metals including 300
grade stainless steel. Care should be taken to separate these vapors from the combus-
tion process. This may be done by wise location of the unit vent and combustion air
terminals with regard to exhausters or prevailing wind directions. Chlorine is heavier
than air. Keep these facts in mind when determining installation location of the heater
in relation to building exhaust systems.
2. Unit Heater
Location
(cont’d)
2.2 Location Recommendations (cont’d)
3. Uncrating and
Preparation
3.1 Uncrating and Inspecting
This unit was test operated and inspected at the factory prior to crating and was in
operating condition. If the heater has incurred any damage in shipment, document the
damage with the transporting agency and contact an authorized Reznor Distributor.
If you are an authorized Distributor, follow the FOB freight policy procedures as pub-
lished by Thomas & Betts for Reznor products.
Check the rating plate for the gas specications and electrical characteristics of the
heater to be sure that they are compatible with the gas and electric supplies at the
installation site.
3.2 Preparing for Installation
Read this booklet and become familiar with the installation requirements of your par-
ticular heater. If you do not have knowledge of local requirements, check with the local
gas company or any other local agencies who might have requirements concerning
this installation. Before beginning, make preparations for necessary supplies, tools,
and manpower.
IMPORTANT: Shipping brackets are attached with cabinet screws. When remov-
ing shipping brackets, re-insert ALL screws into the cabinet.
3.2.1 Field-Installed Parts
If the installation includes optional vertical louvers, downturn nozzle, ceiling mounting
bracket, hanger kit, high altitude kit, multiple heater control, sensor for DDC control,
and/or stepdown transformer, install these options before the heater is suspended.
Complete instructions are in this form or in the option package; option packages are
shipped separately.
Other shipped separate items could include a vent cap (Option CC1 for UDAP); a vent/
combustion air kit (Option CC2 or CC6 for UDAS); a manual gas valve; a thermostat
bracket kit; a thermostat; and/or a thermostat guard. Be sure all options ordered are at
the installation site.
High Altitude Kit, Option DJ20 or DJ21
If the heater is being installed at an elevation above 2000 ft (610M), the input rate will
have to be derated. This is done by adjusting the valve outlet pressure.

Form I-UDA, P/N 195673 Rev 13, Page 7
4. Clearances and
Dimensions
Clearances
Size Top Flue Connector Access Panel Non-Access Side Bottom* Rear
inches mm inches mm inches mm inches mm inches mm inches mm
30 - 125 1 25 6 152 18 457 1 25 1 25 18 457
150 - 400 4 102 6 152 18 457 2 51 1 25 18 457
*Suspend the heater so that the bottom is a minimum of 5 feet (1.5M) above the oor.
4.1 Clearances
Units must be installed so that the clearances in the table are provided for combustion
air space, inspection and service, and for proper spacing from combustible construc-
tion. Clearance to combustibles is dened as the minimum distance from the heater
to a surface or object that is necessary to ensure that a surface temperature of 90°F
above the surrounding ambient temperature is not exceeded.
FIGURE 2 -
Installing High
Altitude Pressure
Switchrequired
above 6000 ft
(1830M) elevation
Gas valve adjustment
for high altitude can
only be done after
heater is operating;
see Paragraph 6.1.
Instructions for Changing Pressure Switch
1. In the control compartment, locate the pressure switch.
2. Mark and disconnect the two wires attached to the pressure switch.
3. Disconnect the sensing tubes from the pressure switch.
4. Locate the two screws holding the switch mounting bracket. Remove the screws and the pressure switch. Save
the screws.
5. Using the same screws, install the high altitude pressure switch. Attach the sensing tubes and wires.
Pressure Switch
Model UDAP
Size 30 45 60 75 100 125 150 175 200 225 250 300 350 400
High Altitude Switch P/N 197031 197032 197031 201160
Negative Pressure OFF Setpoint "w.c. 0.4 0.5 0.4 1.1
Label color Purple Pink Purple Brown
Model UDAP-CV with Option AV6 for Common Venting
Size 30 45 60 75 100
High Altitude Switch P/N 197029 197032 196362 196388
Negative Pressure OFF Setpoint "w.c. 0.6 0.5 0.6 0.5
Label color Lt Blue Pink White Orange
Model UDAS
Size 30 45 60 75 100 125 150 175 200 225 250 300 350 400
High Altitude Switch P/N 197029 196388 197030 197031 201160
Differential Pressure OFF Setpoint "w.c. 0.6 0.5 0.4 0.4 1.1
Label color Lt. Blue Orange Green Purple Brown
Adjusting the valve outlet pressure is done after the heater is in operation; follow the
instructions in Paragraph 6.1. Capacities and inputs for derated units are also listed in
Paragraph 6.1.
If the pressure switch needs to be changed, do that before the heater is operated; fol-
low the instructions in FIGURE 2.
Downturn Nozzle Kits,
Option CD 2, 3, or 4
Follow the instructions with the kit to install. Additional length beyond the front of the
unit is shown in FIGURE 3.
 












FIGURE 3 -
With Optional
Downturn Nozzle
Dimension “U”
-- Applies to both UDAP
and UDAS
Size Options CD2 and CD4 Option CD3
inches mm inches mm
30, 45 7-1/8 181 12-3/8 314
60, 75 8-5/8 219 15 381
100, 125 12-5/8 321 21-7/8 556
150, 175, 200 11-1/2 292 19-7/8 505
225, 250 14-1/2 368 25-1/8 638
300, 350, 400 18-1/2 470 32 813
In addition, if the heater is being installed at an altitude above 6000 ft (1830M), the
pressure switch will have to be changed. If ordered with the unit as Option DJ20 or
DJ21, the pressure switch is shipped separately for eld installation.

Form I-UDA, P/N 195673 Rev 13, Page 8

























































FIGURE 4 - Model UDAP, Power Vented Fan Model
Model UDAP Dimensions (inches ± 1/16)
Size A B C D E F G H J K M N P Q R
30, 45 12-1/8 26-5/8 10 13-13/16 26 21-9/16 5-3/16 6-1/2 2-11/16 3-7/8 17-3/8 11/16 4-5/16 13 9-9/16
60 15-1/8 26-5/8 13 13-13/16 27 21-9/16 7-7/8 6-1/2 5-1/2 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2
75 15-1/8 26-5/8 13 13-13/16 27-5/8 21-9/16 7-7/8 6-1/2 5-1/2 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2
100 23-1/8 26-5/8 21 13-13/16 28-5/8 21-9/16 14-1/2 6-1/2 8-3/4 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2
125 23-1/8 26-5/8 21 13-13/16 29-3/8 21-9/16 14-1/2 6-1/2 8-3/4 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2
150, 175, 200 20-1/8 38-3/16 16 23 42 35-3/8 8-1/2 8-1/4 5-7/16 6-1/2 25-11/16 1-3/8 8-3/16 22-3/16 16-3/8
225, 250 26-1/8 38-3/16 22 23 42 35-3/8 13-1/16 8-13/16 9 6-1/2 25-11/16 1-3/8 8-3/16 22-3/16 15-5/8
300, 350, 400 34-1/8 41 30 23 42 35-3/8 17-1/16 911-13/16 7-5/16 27-11/16 1-3/8 8-3/16 22-3/16 16-3/16
Model UDAP Dimensions (mm ± 2)
Size A B C D E F G H J K M N P Q R
30, 45 308 676 254 351 660 548 132 165 68 98 441 17 110 330 243
60 384 676 330 351 686 548 200 165 140 98 441 17 110 330 267
75 384 676 330 351 702 548 200 165 140 98 441 17 110 330 267
100 587 676 533 351 727 548 368 165 222 98 441 17 110 330 267
125 587 676 533 351 746 548 368 165 222 98 441 17 110 330 267
150, 175, 200 511 970 406 584 1067 899 216 210 138 165 652 35 208 564 416
225, 250 664 970 559 584 1067 899 332 224 229 165 652 35 208 564 397
300, 350, 400 867 1041 762 584 1067 899 433 229 300 186 703 35 208 564 411
4. Clearances and Dimensions (cont’d)
4.2 Dimensions

Form I-UDA, P/N 195673 Rev 13, Page 9
FIGURE 5 - Model UDAS, Separated Combustion Fan Model
Model UDAS Dimensions (inches ± 1/16)
Size A B C D E F G H J K M N P Q R S T
30, 45 12-1/8 26-5/8 10 13-13/16 26 21-9/16 5-3/16 6-1/2 2-11/16 3-7/8 17-3/8 11/16 4-5/16 13 9-9/16 2-15/16 2-15/16
60 15-1/8 26-5/8 13 13-13/16 27 21-9/16 7-7/8 6-1/2 5-1/2 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2 3-1/4 2-15/16
75 15-1/8 26-5/8 13 13-13/16 27-5/8 21-9/16 7-7/8 6-1/2 5-1/2 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2 3-1/4 2-15/16
100 23-1/8 26-5/8 21 13-13/16 28-5/8 21-9/16 14-1/2 6-1/2 8-3/4 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2 4-5/8 2-15/16
125 23-1/8 26-5/8 21 13-13/16 29-3/8 21-9/16 14-1/2 6-1/2 8-3/4 3-7/8 17-3/8 11/16 4-5/16 13 10-1/2 4-5/8 2-15/16
150, 175, 200 20-1/8 38-3/16 16 23 42 35-3/8 8-1/2 8-1/4 5-7/16 6-1/2 25-11/16 1-3/8 8-3/16 22-3/16 16-3/8 4-1/8 8-5/16
225, 250 26-1/8 38-3/16 22 23 42 35-3/8 13-1/16 8-13/16 9 6-1/2 25-11/16 1-3/8 8-3/16 22-3/16 15-5/8 5-9/16 8-5/16
300, 350, 400 34-1/8 41 30 23 42 35-3/8 17-1/16 911-13/16 7-5/16 27-11/16 1-3/8 8-3/16 22-3/16 16-3/16 9-1/16 8-9/16
Model UDAS Dimensions (mm ± 2)
Size A B C D E F G H J K M N P Q R S T
30, 45 308 676 254 351 660 548 132 165 68 98 441 17 110 330 243 75 75
60 384 676 330 351 686 548 200 165 140 98 441 17 110 330 267 89 75
75 384 676 330 351 702 548 200 165 140 98 441 17 110 330 267 89 75
100 587 676 533 351 727 548 368 165 222 98 441 17 110 330 267 117 75
125 587 676 533 351 746 548 368 165 222 98 441 17 110 330 267 117 75
150, 175, 200 511 970 406 584 1067 899 216 210 138 165 652 35 208 564 416 105 211
225, 250 664 970 559 584 1067 899 332 224 229 165 652 35 208 564 397 141 211
300, 350, 400 867 1041 762 584 1067 899 433 229 300 186 703 35 208 564 411 230 217






























































Form I-UDA, P/N 195673 Rev 13, Page 10
WARNINGS: Check the supporting structure to be used to
verify that it has sufcient load carrying capacity to sup-
port the weight of the unit. Suspend the heater only from the
threaded nut retainers or with a manufacturer provided kit.
Do NOT suspend from the heater cabinet.
5. Hanging the
Heater
5.2 Lifting and Suspending
When the heater is lifted for suspension, support the bottom of the heater with plywood
or other appropriately placed material. If the bottom is not supported, damage could
occur. Before hanging, verify that any screws used for holding shipping brackets were
re-installed in the cabinet.
Model UDAS - Whether using the suspension points or a hanger kit, when installing
a Model UDAS, any unused suspension points on the control side of the heater
MUST be plugged. Plug these holes with the 1/2” long cap screws and at washers
shipped in the bag with the heater. (See FIGURE 6.)
5.1 Weights
Before suspending the heater, check the supporting structure to be used to verify that
it has sufcient load-carrying capacity to support the weight of the unit.
Model UDAP
Size 30 45 60 75 100 125 150 175, 200 225 250 300 350 400
lbs 54 59 67 72 96 101 172 187 203 215 269 294 306
kg 24 27 30 33 44 46 78 85 92 98 122 133 139
Model UDAS
Size 30 45 60 75 100 125 150 175, 200 225 250 300 350 400
lbs 55 60 68 73 97 102 173 188 204 216 270 295 307
kg 25 27 31 33 44 46 78 85 93 98 122 134 138



�


FIGURE 6 - Model
UDAS - Plug the
unused suspension
points on the control
side of the heater with
the 1/2” long screws
andatwashers.
Find the screws
and washers in the
literature bag shipped
inside the heater.
WARNING: Unit must be level for proper operation. Do not
place or add additional weight to the suspended heater. Haz-
ard Levels, page 2.
5.2.1 Two-Point or Four-Point Suspension
The heater is equipped for either two-point or four-point suspension. A 3/8”-16 threaded
nut retainer is located at each suspension point. NOTE: Four-point suspension is
requiredwhen installing an optional downturn nozzle. See Dimensions in Paragraph
4.2 and the illustration in FIGURE 7A.