REZNOR UDAP Stepdown Transformer Kit Instruction Manual

: June 9, 2024
: Reznor

Table of Contents

REZNOR UDAP Stepdown Transformer Kit
KITS AND KIT COMPONENTS
INSTALLATION
References
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REZNOR UDAP Stepdown Transformer Kit

REZNOR-UDAP-Stepdown-Transformer-Kit-product-img

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

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

DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE

Table 2. Stepdown Transformer Kit Components—Continued

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

Conduit connector

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.
Table 3. Stepdown Transformers

0.50

| ****

CG1

| UDAP, UDAS| 045, 060, 075, 100, 150, 175| ****

260928

UDX, UDZ| 045, 060, 075, 100
UDBP, UDBS, UBX, UBZ| 030, 045

CG2, CG4

| UDAP, UDAS| 045, 060, 075, 100, 150, 175| ****

11100

UDX, 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

| ****

201240

UDX, UDZ| 045, 060, 075, 100
UDBP, UDBS, UBX, UBZ| 060, 075

65

| UDAP, UDAS| 150, 175, 200| ****

123150

| ****

123152

| ****

201468

UDX, 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 4. Stepdown Transformer Wiring and Conduit—Continued

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

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).

Determine where to install the transformer bracket (refer to installation manual provided with unit):
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 the four-point suspension is used, locate the center hole.
For models UDBP, UDBS, UBX, and UBZ, the bracket is installed on the hanger bar at the suspension point and MUST be done as part of the suspension process.
On back of the transformer bracket flange that will be against the heater cabinet, position the transformer bracket gasket at bottom of the bracket and carefully peel off the backing and adhere the gasket.
Install transformer bracket at a location determined in step 1:
For models UDAP, UDAS, UDX, and UDZ secure the bracket using a capscrew, flat washer, and lock washer (see Figure 1, DETAIL A).
For models UDBP, UDBS, UBX, and UBZ, secure the bracket at the suspension point using a field-supplied hanger rod or optional swivel and field-supplied 3/8-inch hex nuts and lock washers (see Figure 1, DETAIL B) $REZNOR-UDAP-Stepdown-Transformer-Kit-fig- $2$$
CAUTION
The transformer has primary and secondary voltages—note the wire colors and use care when making transformer wiring connections.
Connect transformer wiring:
Run black, white, and green wires through 3/8-inch conduit.
Install anti-short bushing on each end of conduit.
Install straight conduit connector on the transformer—either at the knockout hole in left side or in the bottom. Run black, white, and green wires through connector, connect wires to the transformer using wire connectors in accordance with the wiring diagram on the transformer and connect straight conduit connector to conduit.
NOTE : Depending on the transformer, it is secured either to the installed mounting bracket or to a secondary bracket included with the transformer.
Install transformer on transformer bracket and secure using sheet metal screws. If transformer has integral mounting foot, install as shown in Figure 2, DETAIL A. If transformer has slot in back and secondary bracket, slide transformer slot over top of secondary bracket and install as shown in Figure 2, DETAIL B. $REZNOR-UDAP-Stepdown-Transformer-Kit-fig- $3$$
Connect supply wiring to transformer:
Install 90-degree conduit connector at line voltage inlet on rear of heater so that entrance is facing fan or blower.
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.
Locate cabinet screw in path of conduit. Remove screw and use it to secure conduit to cabinet using conduit clamp.
Remove heater access panel and connect supply wiring to taps inside the transformer in accordance with wiring diagram on transformer label.
Complete heater installation in accordance with installation and venting manuals provided with unit.

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