Reznor UDAP gas-fired unit heaters provide efficient and reliable heating solutions for various industrial and commercial spaces. Equipped with advanced features, these heaters offer precise temperature control, improved energy efficiency, and enhanced safety measures. With a range of sizes and configurations, UDAP heaters cater to a variety of heating needs, ensuring optimal comfort and productivity in your workspace.
Reznor UDAP gas-fired unit heaters provide efficient and reliable heating solutions for various industrial and commercial spaces. Equipped with advanced features, these heaters offer precise temperature control, improved energy efficiency, and enhanced safety measures. With a range of sizes and configurations, UDAP heaters cater to a variety of heating needs, ensuring optimal comfort and productivity in your workspace.
Revision: OPT-CG1-CG2-CG4 (12-22) 201244-A
STEPDOWN TRANSFORMER KIT INSTALLATION
FOR GAS-FIRED UNIT HEATERS
Supersedes: I-UD-X (02-16) PN201244R8
OPTIONS CG1, CG2, AND CG4 FOR MODELS UDAP, UDAS, UDX, AND UDZ
AND UNIT SIZES 030–125 OF MODELS UDBP, UDBS, UBX, AND UBZ
⚠ DANGER ⚠
• 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.
• Installation should be done by a qualified agency in accordance with these instructions and in
compliance with all codes and requirements of authorities having jurisdiction.
•The stepdown transformer steps down the supply power from 208V, 230V, or 460V to 115V for models UDAP,
UDAS, UDBP, UDBS, UBX, UBZ, UDX, and UDZ.
•Refer to the installation manual provided with the unit for important safety information.
KITS AND KIT COMPONENTS
NOTE: The transformer is shipped in its original carton. Other parts are shipped in a separate carton.
Ensure that all of the applicable following components are available before beginning installation.
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
Table 1. Stepdown Transformer Kits
Option
(Voltage) Model
Unit Size
030 045 060, 075 100 125 150, 175 200 225, 250 300, 350,
400
PN
CG1
(208/115)
UDAP, UDAS 260919 262851 262850 262851 262850 260922 260923
UDX, UDZ 260920 260921
UDBP, UDBS, UBX, UBZ 260924 260925 260926 —
CG2
(230/115)
UDAP, UDAS 197150 197151 262852 262853 262852 197153 197154
UDX, UDZ 197152
UDBP, UDBS, UBX, UBZ 202976 202977 202978 —
CG4
(460/115)
UDAP, UDAS 197150 197151 262852 262853 262852 197153 197154
UDX, UDZ 197152
UDBP, UDBS, UBX, UBZ 202976 202977 202978 —
Table 2. Stepdown Transformer Kit Components
Component Description Model
Unit Size
030, 045, 060,
075, 100, 125 150, 175, 200 225, 250, 300,
350, 400
PN (Quantity)*
Stepdown transformer Refer to Table 3
Bracket Transformer
UDAP, UDAS, UDBP, UDBS 197080
UDX, UDZ 197079 197080
UBX, UBZ 197079 —
Gasket Transformer bracket UDAP, UDAS, UDBP, UDBS 195663
UDX, UDZ, UBX, UBZ 236155
*Quantity is one (1) unless otherwise indicated.
2OPT-CG1-CG2-CG4 (12-22) 201244-A
KITS AND KIT COMPONENTS—CONTINUED
Table 3. Stepdown Transformers
kVA Option Model Unit Size Transformer PN
0.25 CG1 UDAP, UDAS, UDX, UDZ 030 260927
CG2, CG4 11279
0.50
CG1
UDAP, UDAS 045, 060, 075, 100, 150, 175
260928UDX, UDZ 045, 060, 075, 100
UDBP, UDBS, UBX, UBZ 030, 045
CG2, CG4
UDAP, UDAS 045, 060, 075, 100, 150, 175
11100UDX, UDZ 045, 060, 075, 100
UDBP, UDBS, UBX, UBZ 030, 045
0.75
CG1 UDAP, UDAS 125, 200 260929
UDX, UDZ 125, 150, 175, 200
CG2, CG4 UDAP, UDAS 125, 200 11217
UDX, UDZ 125, 150, 175, 200
1.00
CG1 UDAP, UDAS, UDX, UDZ 225, 250 223462
UDBP, UDBS, UBX, UBZ 060, 075
CG2, CG4 UDAP, UDAS, UDX, UDZ 225, 250 16065
UDBP, UDBS, UBX, UBZ 060, 075
1.50 CG1 UDAP, UDAS, UDX, UDZ 300, 350, 400 260930
CG2, CG4 197085
2.00 CG1 UDBP, UDBS, UBX, UBZ 100, 125 260931
CG2, CG4 202979
Table 4. Stepdown Transformer Wiring and Conduit
Component Length
(Inches) Model Unit Size
Color
Black White Green
PN
Wire, #14AWG,
rated for 105°C
54 UDAP, UDAS, UDX, UDZ 030 32520 201243 201241
UDBP, UDBS, UBX, UBZ 030, 045
62
UDAP, UDAS 045, 060, 075, 100, 125
7208 201242 201240UDX, UDZ 045, 060, 075, 100
UDBP, UDBS, UBX, UBZ 060, 075
65
UDAP, UDAS 150, 175, 200
123150 123152 201468UDX, UDZ 125, 150, 175, 200
UDBP, UDBS, UBX, UBZ 100, 125
72 UDAP, UDAS, UDX, UDZ 225, 250 48862 48861 201462
86 300, 350, 400 201466 201467 201469
Table 2. Stepdown Transformer Kit Components
Component Description Model
Unit Size
030, 045, 060,
075, 100, 125 150, 175, 200 225, 250, 300,
350, 400
PN (Quantity)*
Wiring and conduit Refer to Table 4
Bushing Anti-short
All
16358 (2)
Wire connector 73B (Ideal #3-0253) 16354 (10)
Conduit clamp 1/2 (Heyco #3328) 16227
Conduit connector
Straight (T&B #253) UDAP, UDAS, UDX, UDZ 16199
Straight (T&B #302) UDBP, UDBS, UBX, UBZ 16202 —
90-degree (T&B #XC-290) All 1417
Capscrew Hex head, 3/8 × 1
UDAP, UDAS, UDX, UDZ
32253
Washer Flat, 3/8 6593 (2)
Lockwasher 3/8 5197
Screw Sheet metal, #10 × 1/2 All 11813 (3)
*Quantity is one (1) unless otherwise indicated.
—Continued
3
OPT-CG1-CG2-CG4 (12-22) 201244-A
INSTALLATION
NOTE: Install the stepdown transformer before or while suspending the heater. The transformer
mounts on the side of the heater opposite the access door (left side when facing the front of the
heater).
1. Determine where to install transformer bracket (refer to installation manual provided with unit):
a. For models UDAP, UDAS, UDX, and UDZ, bracket is installed in unused 3/8-inch suspension hole on top
of heater. If two-point suspension is used, locate hole near back of heater. If four-point suspension is used,
locate center hole.
b. For models UDBP, UDBS, UBX, and UBZ, bracket is installed on hanger bar at suspension point and MUST
be done as part of suspension process.
2. On back of transformer bracket flange that will be against heater cabinet, position transformer bracket gasket at
bottom of bracket and carefully peel off backing and adhere gasket.
3. Install transformer bracket at location determined in step 1:
a. For models UDAP, UDAS, UDX, and UDZ, secure bracket using capscrew, flat washer, and lockwasher (see
Figure 1, DETAIL A).
b. For models UDBP, UDBS, UBX, and UBZ, secure bracket at suspension point using field-supplied hanger rod
or optional swivel and field-supplied 3/8-inch hex nuts and lockwashers (see Figure 1, DETAIL B).
Figure 1. Transformer Bracket Installation
DETAIL A (UDAP, UDAS, UDX, UDZ) DETAIL B (UDBP, UDBS, UBX, UBZ)
CAPSCREW
FLAT WASHER
LOCKWASHER
BRACKET
WITH GASKET
HANGER ROD
OR SWIVEL
LOCKWASHER
AND HEX NUT
BRACKET
WITH GASKET
Table 4. Stepdown Transformer Wiring and Conduit
Component Length
(Inches) Model Unit Size
Color
Black White Green
PN
Conduit, 3/8-inch
38 UDAP, UDAS, UDX, UDZ 030 45097
UDBP, UDBS, UBX, UBZ 030, 045
46
UDAP, UDAS 045, 060, 075, 100, 125
174394
UDX, UDZ 045, 060, 075, 100
UDBP, UDBS, UBX, UBZ 060, 075
49
UDAP, UDAS 150, 175, 200
63292
UDX, UDZ 125, 150, 175, 200
UDBP, UDBS, UBX, UBZ 100, 125
56 UDAP, UDAS, UDX, UDZ 225, 250 10460
70 300, 350, 400 201465
—Continued
Specifications and illustrations subject to change without notice or incurring obligations.
Latest version of this manual is available at www.reznorhvac.com.
©2022 Nortek Global HVAC LLC, O’Fallon, MO. All rights reserved.
OPT-CG1-CG2-CG4 (12-22) 201244-A
INSTALLATION—CONTINUED
⚠ CAUTION ⚠
The transformer has primary and secondary voltages—note the wire colors and use care when
making transformer wiring connections.
4. Connect transformer wiring:
a. Run black, white, and green wires through 3/8-inch conduit.
b. Install anti-short bushing on each end of conduit.
c. Install straight conduit connector on transformer—either at knockout hole in left side or in bottom. Run black,
white, and green wires through connector, connect wires to transformer using wire connectors in accordance
with wiring diagram on transformer, and connect straight conduit connector to conduit.
NOTE: Depending on the transformer, it is secured either to the installed mounting bracket or to
a secondary bracket included with the transformer.
5. Install transformer on transformer bracket and secure using sheet metal screws. If transformer has integral
mounting foot, install as shown in Figure 2, DETAIL A. If transformer has slot in back and secondary bracket,
slide transformer slot over top of secondary bracket and install as shown in Figure 2, DETAIL B.
DETAIL A DETAIL B
SCREWS
SCREWS
TRANSFORMER
TRANSFORMER
SECONDARY BRACKET
Figure 2. Transformer Installation
6. Connect supply wiring to transformer:
a. Install 90-degree conduit connector at line voltage inlet on rear of heater so that entrance is facing fan or blower.
b. Run 3/8-inch conduit from transformer to bottom rear of heater and across to 90-degree conduit connector.
Run black, white, and green wires through connector and connect conduit to connector.
c. Locate cabinet screw in path of conduit. Remove screw and use it to secure conduit to cabinet using conduit
clamp.
d. Remove heater access panel and connect supply wiring to taps inside transformer in accordance with wiring
diagram on transformer label.
7. Complete heater installation in accordance with installation and venting manuals provided with unit.
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4
Reznor UDAP gas-fired unit heaters provide efficient and reliable heating solutions for various industrial and commercial spaces. Equipped with advanced features, these heaters offer precise temperature control, improved energy efficiency, and enhanced safety measures. With a range of sizes and configurations, UDAP heaters cater to a variety of heating needs, ensuring optimal comfort and productivity in your workspace.
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