RELAY KIT INSTALLATION FOR MULTIPLE HEATER CONTROL
OPTIONS CL31 AND CL32 FOR MODELS APD, F, B, UDAP, UDAS, UDBP, UDBS, UEAS, AND VR
• 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
Model
APD, UDAP, UDAS, UDBP, UDBS
F. B, VR
UEAS
*
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.
Ensure that all components listed in
*
Component
Item No.
—
Option package PN
1
Relay assembly
1A
Relay
2
Screw
3
Cable clamp
4
Label
5
Transformer
6
Wiring harness assembly
*
See
Figure 1
and
Figure
2.
**
Option CL31 includes components for one control unit and one additional unit. Option CL32 includes components for each additional non-
control unit with the following exception: for 208V, 230V, and 460V F, B, and VR models, option CL32 is used for the control unit and each
additional non-control unit (refer to
⚠ CAUTION ⚠
Table 1.
Table 1. Model/Voltage/Option Applicability
Voltage/Phase
115/1, 208/1, 230/1, 208/3, 230/3,
460/3, 575/3
115/1
208/1, 230/1, 208/3, 230/3, 460/3
575/3
115/1
COMPONENTS
Table 2
are available before beginning installation.
Table 2. Relay Kit Components
APD, UDAP, UDAS, and UEAS Models
Includes relay and specially-designed bracket
Wired and mounted on bracket
Self-drilling, for securing relay bracket
3/16
Wiring diagram
40VA
Brown wires
Table
1).
Revision: OPT-CL31-CL32 (04-22) 102247-B
Supersedes: OPT-CL31-CL32 (01-22) 102247-A
Option for
Option for
Control Unit
Non-Control Unit(s)
CL31
CL31
CL32
CL31
CL31
Description
No. of Non-Control
Units Permitted
CL32
4
**
Option
CL31
CL32
PN (Quantity)
197155 (1)
197156 (1)
197157 (2)
197157 (1)
18549 (2)
18549 (1)
195249 (2)
195249 (1)
16228 (2)
16228 (1)
197164 (2)
197164 (1)
194808 (1)
—
197160 (1)
—
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