Reznor CL31 User manual

Revision: LDAP-CL31,32 (06-22) 1041278-A
RELAY KIT INSTALLATION FOR MULTIPLE HEATER CONTROL
Supersedes: LDAP-CL31,32 (04-22) 1041278-0
OPTIONS CL31 AND CL32 FOR MODEL LDAP
⚠ 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 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.
•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
Voltage/Phase Option for
Control Unit
Option for
Non-Control Unit(s)
No. of Non-Control
Units Permitted
208/1, 230/1 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.
Table 2. Relay Kit Components
Item No.*Component Description
Option**
CL31 CL32
PN (Quantity)
— Option package PN 1041280 (1) 1041286 (1)
1Relay assembly*** Assembly 208365 (2) 208365 (1)
1A Relay With wires and wire terminals 18549 (2) 18549 (1)
2 Screw #8-18 ×1/2, for securing relay bracket 38529 (4) 38529 (2)
3 Label Wiring diagram 208185 (2) 208185 (1)
*See Figure 1.
**Option CL31 includes components for one control unit and one additional unit. Option CL32 includes components for each additional non-
control unit.
***Consists of a relay plug, 24VAC, DPDT (PN 211411) and a relay socket (PN 211415) with wires (all with terminals): 42-inch red, 42-inch
white, 6-inch blue, and 6-inch brown. If replacing a previously-used relay only (PN 98118), order kit (PN 263527) to replace.
INSTALLATION
Install the relay kit as follows. Item numbers refer to Table 2.
1. Turn OFF gas and electric power.
2. Install relay assembly on control unit and on all non-control units (see Figure 1):
a. Remove access panel from main heat section.
b. Position relay assembly (1 and 1A) on control panel and secure using screws (2).

1
1A
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.
Figure 1. Relay Installation (Refer to Table 2)
⚠ CAUTION ⚠
Be careful not to short thermostat leads to a metal surface. Doing so will cause the transformer
to fail and require replacement.
3. Connect relay (1A) to TEW-type control wiring in accordance with model-specific wiring diagram label (3) from
kit. Do not exceed length and distance listed in Table 3.
4. Install wiring diagram label:
a. 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 (3).
b. Locate required wiring diagram label position inside of access panel.
c. Wipe surface with clean, dry cloth.
d. Remove label backing and adhere label to unit.
5. Restore system to service:
a. Turn ON gas and electric power.
b. Light heater in accordance with lighting instructions.
c. 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.
LDAP-CL31,32 (06-22) 1041278-A
INSTALLATION—CONTINUED