Revision: OPT-CL31-CL32 (11-21) 102247-A
RELAY KIT INSTALLATION FOR MULTIPLE HEATER CONTROL
Supersedes: I-OPT-MH (02-16) PN102247R8
OPTIONS CL31 AND CL32 FOR MODELS APD, F, B, LDAP, UBX, UBZ, UDAP, UDAS,
UDBP, UDBS, UDX, UDZ, UEAS, UEZ, AND VR
GENERAL INFORMATION
These relay kits are designed to permit the control of up to six heaters (one control unit and up to five 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.
Important Safety Information
• 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.
⚠ 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.
Applicability
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/Option/Voltage Applicability
Model Voltage/Phase
Option for
Control Unit
Option for
Non-Control Unit(s)
No. of Non-Control
Units Permitted
APD, UBX, UBZ, UDAP, UDAS,
UDBP, UDBS, UDX, UDZ
115/1, 208/1, 230/1, 208/3, 230/3,
460/3, 575/3
CL31 CL32 4
F. B, VR
115/1 CL31 CL32
4208/1, 230/1, 208/3, 230/3, 460/3 CL32 CL32
575/3 CL31 CL32
LDAP 208/1, 230/1 CL31 CL32
4*
UEAS, UEZ 115/1 CL31 CL32 4
*Except as follows: unit size 400 can have five (5) additional non-control units, unit size 800 can have three (3) additional non-control units,
and unit size 1200 can have two (2) additional non-control units.
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