Reznor APD, a reliable and versatile unit, offers efficient heating solutions for various commercial and industrial applications. Its advanced features include:
-
Multiple heater control options with CL31 and CL32 relay kits, allowing precise temperature management of up to five heaters with a single thermostat.
-
Easy installation and wiring with detailed instructions and labeled components, ensuring proper setup and operation.
-
Safe and reliable performance with built-in safety features and compliance with electrical and gas codes, providing peace of mind.
-
Durable construction and high-quality components, ensuring longevity and dependable heating performance in demanding environments.
Reznor APD, a reliable and versatile unit, offers efficient heating solutions for various commercial and industrial applications. Its advanced features include:
-
Multiple heater control options with CL31 and CL32 relay kits, allowing precise temperature management of up to five heaters with a single thermostat.
-
Easy installation and wiring with detailed instructions and labeled components, ensuring proper setup and operation.
-
Safe and reliable performance with built-in safety features and compliance with electrical and gas codes, providing peace of mind.
-
Durable construction and high-quality components, ensuring longevity and dependable heating performance in demanding environments.
Revision: OPT-CL31-CL32 (04-22) 102247-B
RELAY KIT INSTALLATION FOR MULTIPLE HEATER CONTROL
Supersedes: OPT-CL31-CL32 (01-22) 102247-A
OPTIONS CL31 AND CL32 FOR MODELS APD, F, B, UDAP, UDAS, UDBP, UDBS, UEAS, AND VR
⚠ 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.
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
APD, UDAP, UDAS, UDBP, UDBS 115/1, 208/1, 230/1, 208/3, 230/3,
460/3, 575/3 CL31
CL32 4
F. B, VR
115/1 CL31
208/1, 230/1, 208/3, 230/3, 460/3 CL32
575/3 CL31
UEAS 115/1 CL31
*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.
COMPONENTS
Ensure that all components listed in Table 2 are available before beginning installation.
Table 2. Relay Kit Components
Item No.*Component Description
Option**
CL31 CL32
PN (Quantity)
APD, UDAP, UDAS, and UEAS Models
— Option package PN 197155 (1) 197156 (1)
1 Relay assembly Includes relay and specially-designed bracket 197157 (2) 197157 (1)
1A Relay Wired and mounted on bracket 18549 (2) 18549 (1)
2 Screw Self-drilling, for securing relay bracket 195249 (2) 195249 (1)
3 Cable clamp 3/16 16228 (2) 16228 (1)
4 Label Wiring diagram 197164 (2) 197164 (1)
5 Transformer 40VA 194808 (1) —
6 Wiring harness assembly Brown wires 197160 (1) —
*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 Table 1).
2OPT-CL31-CL32 (04-22) 102247-B
INSTALLATION
Install the relay kit as follows. Item numbers refer to Table 2.
1. Turn OFF gas and electric power.
2. Replace transformer on control unit (all models except UDBP and UDBS):
a. Remove or open panel(s) as necessary and locate factory-installed transformer (see Figure 1).
(1) For models APD, UDAP, UDAS, and UEAS, transformer is mounted on control board at bottom of control
compartment.
(2) For models F and B, remove left (when facing rear of heater) outer side panel to expose inner side panel
and wiring.
(3) For model VR, open control side only.
b. Mark and disconnect transformer wires and remove existing transformer.
c. Install replacement transformer:
(1) For models APD, UDAP, UDAS, UEAS, and VR, secure transformer (5) using same screws.
(2) For models F and B, slide Tinnerman clips (2A) over transformer (5) and secure transformer using screws
(2) from kit.
(3) Reconnect transformer wires.
d. Install or close panel(s) as necessary.
Table 2. Relay Kit Components
Item No.*Component Description
Option**
CL31 CL32
PN (Quantity)
UDBP and UDBS Models
— Option package PN 202958 (2) 197156 (1)
1 Relay assembly Includes relay and specially-designed bracket 197157 (2) 197157 (1)
1A Relay Wired and mounted on bracket 18549 (2) 18549 (1)
2 Screw Self-drilling, for securing relay bracket 195249 (2) 195249 (1)
3 Cable clamp 3/16 16228 (2) 16228 (1)
4 Label Wiring diagram 197164 (2) 197164 (1)
F and B Models
— Option package PN 102248 (1) 102249 (1)
1 Relay assembly Includes relay and specially-designed bracket 102243 (2) 102243 (1)
1A Relay Wired and mounted on bracket 18549 (2) 18549 (1)
2 Screw Sheet metal, #6 × 1-1/2, for transformer 103152 (2) —
2A Tinnerman clip #C1110-62, for transformer screws 111233 (2)
3 Cable clamp 3/16 16228 (2) 16228 (1)
4 Label Wiring diagram 131127 (2) 131127 (1)
5 Transformer 35VA 102708 (1) —
VR Models
— Option package PN 205685 (1) 205686 (1)
1 Relay assembly Includes relay and specially-designed bracket 102243 (2) 102243 (1)
1A Relay Wired and mounted on bracket 18549 (2) 18549 (1)
2 Screw #8 × 1 121033 (4) 121033 (2)
2A Spacer 98872 (4) 98872 (2)
3 Cable clamp 3/16 16228 (2) 16228 (1)
4 Label Wiring diagram 197164 (2) 197164 (1)
5 Transformer 40VA 194808 (1) —
5A Wire connector Twist-on, orange 16354 (1)
*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 Table 1).
COMPONENTS—CONTINUED
—Continued
3
OPT-CL31-CL32 (04-22) 102247-B
Figure 1. Transformer Replacement (Refer to Table 2)
3. Install relay assembly on control unit and on all non-control units (see Figure 2):
a. For models APD, APD, UDAP, UDAS, UDBP, UDBS, and UEAS:
(1) At rear of heater, remove screws from edge of cabinet bottom.
(2) Secure relay assembly (1 and 1A) and cable clamp (3) as shown using existing screws for unit sizes
030–125 or one existing screw and one screw (2) from kit for unit sizes 150–400 and all UEAS models.
b. For models F and B:
(1) At rear of heater, remove thermostat terminal strip screws and remove terminal strip.
(2) Slide relay assembly (1 and 1A) bracket underneath thermostat terminal strip and secure bracket, terminal
strip, and cable clamp (3) as shown using existing screws.
(3) Secure blue and brown wires in cable clamp (3).
c. For model VR:
(1) At end of burner/control box, remove thermostat terminal strip screws and remove terminal strip.
(2) Secure terminal strip, relay assembly (1 and 1A), and cable clamp (3) as shown using screws (2) and
spacers (2A).
(3) Secure blue and brown wires in cable clamp (3).
⚠ CAUTION ⚠
Be careful not to short thermostat leads to a metal surface. Doing so will cause the transformer
to fail and require replacement.
MODELS APD, UDAP, UDAS, AND UEAS
UNIT SIZES 150–400
MODELS F AND B MODEL VR
5
5A
5
55
UNIT SIZES 030–125
APD, UDAP, UDAS,
UEAS
APD, UDAP, UDAS,
UEAS
INSTALLATION—CONTINUED
5. 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 (4).
b. Locate required wiring diagram label position on unit:
(1) For models APD, APD, UDAP, UDAS, UDBP, UDBS, and UEAS, label location is bottom rear corner of
access panel.
(2) For models F and B, label location is lower right corner of outer left (when facing rear of heater) side panel.
(3) For model VR, label location is rear of burner box above terminal strip.
c. Wipe surface with clean, dry cloth.
d. Remove label backing and adhere label to unit.
6. Restore system to service:
a. Turn ON gas and electric power.
b. Light heater in accordance with lighting instructions.
c. Check for proper operation.
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 2. Relay Installation (Refer to Table 2)
NOTE: VR models do not have a W2 terminal. Splice between the DSI control COM and 24V on the
transformer and use the twist-on wire connector (5A) to connect the wires.
4. 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.
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-CL31-CL32 (04-22) 102247-B
MODELS APD, UDAP, UDAS,
UDBP, UDBS, and UEAS MODELS F and B MODEL VR
2
1
1A
32
2A
2
3
2A
1
1A
4
3
1
1A
-
1
-
2
-
3
-
4
Reznor APD, a reliable and versatile unit, offers efficient heating solutions for various commercial and industrial applications. Its advanced features include:
-
Multiple heater control options with CL31 and CL32 relay kits, allowing precise temperature management of up to five heaters with a single thermostat.
-
Easy installation and wiring with detailed instructions and labeled components, ensuring proper setup and operation.
-
Safe and reliable performance with built-in safety features and compliance with electrical and gas codes, providing peace of mind.
-
Durable construction and high-quality components, ensuring longevity and dependable heating performance in demanding environments.
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