REZNOR UBX Unit Heater Instruction Manual

REZNOR UBX Unit Heater

Revision: UBX-UBZ-UDX-UDZ-UEZ-CL31,32 (05-22) 1041279-0
Supersedes: — (Original Version)

RELAY KIT INSTALLATION FOR MULTIPLE HEATER CONTROL

OPTIONS CL31 AND CL32 FOR MODELS UBX, UBZ, UDX, UDZ, AND UEZ

CAUTION

• DO NOT use these multiple heater control options with a two-stage gas valve or a two-stage thermostat.
• These instructions are designed to assist a qualified electrician in installing this multiple heater control kit.
• All electrical wiring and connections, including electrical grounding, MUST be in accordance with the National Electric Code ANSI/NFPA No. 70 (latest edition) or, in Canada, with the Canadian Electrical Code, Part 1, CSA Standard C22.1. In addition, the installation must comply with local ordinances and applicable gas company requirements.
• These relay kits are designed to permit the control of up to five heaters (one control unit and up to four additional non-control units) with one single-stage thermostat or with a time clock and single or multiple single-stage thermostats. For maximum safety, the multiple control is installed in the low voltage circuit. Interruption of the supply voltage is not recommended.
• Refer to the installation manual provided with the heater for important safety information.
• Pay attention to all dangers, warnings, cautions, and notes highlighted in this manual. Safety markings should not be ignored and are used frequently throughout to designate a degree or level of seriousness.
• Model/option/voltage applicability is listed in Table 1 and kit components are listed in Table 2. Ensure that all components listed in Table 2 are available before beginning installation.

Table 1.  Model/Voltage/Option Applicability

Model| Voltage/Phase| Option for Control Unit| Option for Non-Control Unit(s)| No. of Non-Control Units Permitted
UBX, UBZ, UDX, UDZ| 115/1, 208/1, 230/1, 208/3, 230/3, 460/3, 575/3| CL31| CL32| 4
UEZ| 115/1
Table 2.  Relay Kit Components

Item No. *| Component| Description| Model
UBX, UBZ| UDX, UDZ, UEZ
Option**
CL31| CL32| CL31| CL32
Kit PN
1041281| 1041287| 1041288| 1041287
Component PN (Quantity)
1| Relay assembly| Includes relay and specially-designed bracket| 197157 (2)| 197157 (1)| 197157 (2)| 197157 (1)
1A| Relay| Wired and mounted on bracket| 18549 (2)| 18549 (1)| 18549 (2)| 18549 (1)
2| Screw| Self-drilling, for securing relay bracket| 195249 (2)| 195249 (1)| 195249 (2)| 195249 (1)
3| Cable clamp| 3/16| 16228 (2)| 16228 (1)| 16228 (2)| 16228 (1)
4| Label| Wiring diagram| 197164 (2)| 197164 (1)| 197164 (2)| 197164 (1)
5| Transformer| 40VA| —| 194808 (1)| —
6| Wiring harness assembly| Brown wires| 197160 (1)
* See Figure 1and Figure 2.
** Option CL31 includes components for one control unit and one additional unit. Option CL32 includes components for each additional non- control unit.

INSTALLATION

Install the relay kit as follows. Item numbers in parentheses refer to Table 2.

1. Turn OFF gas and electric power.
2. Replace transformer on control unit (models UDX, UDZ, and UEZ):
3. Remove or open panel(s) as necessary and locate existing transformer (see Figure 1) mounted at top of control compartment for unit size 055–110 UEZ models or on control board at bottom of control compartment for unit size 130–310 UEZ and all UDX and UDZ models.
4. Mark and disconnect transformer wires
5. Remove screws that secure existing transformer and remove transformer.
6. Install replacement transformer (5) and secure using existing screws.
7. Reconnect transformer wires.
8. Install or close panel(s) as necessary.}
   Figure 1. Transformer Location (Refer to Table

3. Install relay assembly on control unit and on all non-control units (see Figure 2):

4. At rear of heater, remove screws from edge of cabinet bottom.

5. For model UBX, UBZ, UDX, and UDZ unit sizes 150–400 and all UEZ models, align relay assembly (1) bracket as shown and use bracket as template to drill hole in edge of cabinet bottom as shown.

6. Secure relay assembly (1 and 1A) and cable clamp (3) as shown using existing screws for model UBX, UBZ, UDX, and UDZ unit sizes 030–125 or one existing screw and one screw (2) from kit for model UBX, UBZ, UDX, and UDZ unit sizes 150–400 and all UEZ models.
   CAUTION
   Be careful not to short thermostat leads to a metal surface. Doing so will cause the transformer to fail and require replacement.

7. Connect relay (1A) to TEW-type control wiring in accordance with model-specific wiring diagram label (4) from kit. Do not exceed length and distance listed in Table 3.
   Table 3.  Control Wiring Specifications

   Gauge| Maximum Length (Feet (Meters)) | Maximum Distance (Feet (Meters))
   12| 2100 (640)| 1050 (320)
   14| 1300 (457)| 650 (198)
   18| 500 (152)| 250 (76)
   For complete circuit.

8. Install wiring diagram label:

9. For future reference, check appropriate box for heater function—PRIMARY HEATER for control unit or SECONDARY HEATER for non-control unit—on wiring diagram label (4).

10. Locate required wiring diagram label position on bottom rear corner of access panel.

11. Wipe surface with clean, dry cloth.

12. Remove label backing and adhere label to unit.

13. Restore system to service:

14. Turn ON gas and electric power.

15. Light heater in accordance with lighting instructions.

16. Check for proper operation.

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.
UBX-UBZ-UDX-UDZ-UEZ-CL31,32 (05-22) 1041279-A

References

• Reznor HVAC

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