Reznor UDBS Option Installation Manual
Thermostat Options CL18 and CL7
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Installation Form RZ-NA I-OPT-T (Version A)
Obsoletes Form RZ-NA I-OPT-T
APPLIES TO: All Sizes of Models UDAP, UDAS,
®
UDBP, UDBS with single-stage or two-stage valve;
Model LDAP 400 with two-stage valve;
Model LDAP 400, 800, and 1200 with single-stage valve
Description and
Application
Option CL18 is a two-stage thermostat and subbase with an auto/on fan (blower)
switch and an off/auto system switch. Option CL7 is a two-stage thermostat and
subbase with an off/auto system switch. These thermostat options apply to the
Reznor Models listed, but the application varies. Select the model and application from the table below and follow the appropriate instructions.
Model Application Installation Instructions
UDAP, UDAS, UDBP, UDBS
(all sizes) with a two-stage gas
valve (Option AG2)
LDAP 400 with a two-stage
gas valve (Option AG2)
LDAP 800 and LDAP 1200
with single-stage gas valves
(AG1)
UDAP, UDAS, UDBP, UDBS,
an d LDAP (all sizes) with
single stage gas valve(s)
(AG1)
Two stages of heat
the thermostat is used to provide two stages of heating by
controlling operation of the two-stage gas valve.
Stag ed hea t sections
first stage fires one heat section on a Model 800 or one or
two heat sections on a Model 1200. Second stage fires all
heat sections.
Recirculation and Sing le Sta ge Heat
temperature settings, first stage provides automatic fan or
blower only recirculation (no heat) and the second stage
fires the uni t at full fire.
Kit Components
Two-Stage Thermostat
with Subbase
P/N 197265, Option CL18 Thermostat Kit for Model LDAP, UDAP,
UDAS, UDBP, or UDBS includes:
Qty P/N Description
1
1
1
P/N 208945, Option CL7 Thermostat Kit for Model LDAP, UDAP, UDAS,
UDBP, or UDBS includes:
Qty P/N Description
1
1
- Based on the temperature settings,
- Based on the temperature settings,
- Based on th e
93436
Two-Stage Thermostat, Honeywell #T874F1130, with
Subbase, Honeywell #Q674C1009
123942
197264
93435
Thermostat Terminal Jumper
Instruction Sheet, Form I-OPT-T
Two-Sta
e Thermostat, Honeywell #T874F1130 with Subbase,
Honeywell #Q674G
197264
Instruction Sheet, Form I-OPT-T
THIS INSTRUCTION SHEET
DOES NOT APPLY.
sheet. Install the thermostat by
following the manufacturer’s
instructions that are provided with the
thermostat
the heater.
requirements for thermostat location.
and the wiring diagram on
Be sure to comply with the
Discard this
READ CAREFULLY AND
FOLLOW THE
INSTRUCTIONS ON THIS
SHEET.
Installation Instructions for Automatic Fan or Blower Only
Recirculation Control and Single-Stage Heating
Installation
Instructions
WARNING: Improper installation, adjustment, alteration, service,
or maintenance can cause property damage, injury or death. Read
the installation, operation, and maintenance instructions thoroughly
before installing or servicing this equipment.
Form RZ-NA I-OPT-T (Version A), P/N 197264 (Rev 4), page 1
Installation Instructions for Automatic Fan or Blower Only
Recirculation Control and Single-Stage Heating (cont’d)
NOTE: These instructions
DO NOT apply to two-stage
heating applications. If using
a two-stage gas valve or using
the two-stage thermostat for
staging heat sections, follow
the instructions in the heater
installation manual.
FIGURE 1A - Option
CL18 Two-Stage
Thermostat Connections
for Model UDAP, UDAS,
UDBP, or UDBS with
Single-Stage Gas Valve and
installed to provide
recirculation:
1st stage - automatic fan or
blower recirculation (no
heat)
2nd stage - full fire heat
1. Install the Thermostat
Install the thermostat according to the manufacturer’s instructions. Be careful
to comply with the requirements covering the location of the thermostat.
Model UDAS, UDAP, UDBS, or UDBP -- Follow connection diagram in
FIGURE 1A or 1B below to connect the 24 volt thermostat wiring.
Model LDAP -- Follow connection diagram in FIGURE 2A, 2B, or 2C, on
page 3 to connect the 24 volt thermostat wiring.
2. For future reference, put this instruction sheet with the heater installation
manual. Turn on the electric and the gas. Follow the lighting instructions to
light the heater. Check for proper operation.
with Q674C SUBBASE
RC
W1
W2
RH
TERMINAL STRIP ON
BACK OF HEATER
G
G
W1
R
PR
Y
DOOR INTERLOCK
(UDBS or UDAS ONLY)
R
R
P3-1
P3-2
P3-3
P3-4
FACTORY WIRING
FIELD WIRING
Y
INTEGRATED
CIRCUIT BOARD
G
W
R
FIGURE 1B - Option CL7
Two-Stage Thermostat
Connections for Model
UDAP, UDAS, UDBP, or
UDBS with Single-Stage
Gas Valve and installed to
provide recirculation:
1st stage - fan or blower
recirculation (no heat)
2nd stage - full fire heat
(OPT CL18) T874F THERMOSTAT
W2
Set thermostat first stage anticipator at maximum
and second stage anticipator at 0.6 amps.
Jumper thermostat terminals G to W1 and RH to RC.
(OPT CL7) T874F THERMOSTAT
with Q674G SUBBASE
W1
W2
TERMINAL STRIP ON
BACK OF HEATER
G
PR
W1
R
R
W2
Y
DOOR INTERLOCK
(UDBS or UDAS ONLY)
R
R
P3-1
P3-2
P3-3
P3-4
FACTORY WIRING
FIELD WIRING
Y
INTEGRATED
CIRCUIT BOARD
G
W
R
Set thermostat first stage anticipator at maximum
and second stage anticipator at 0.6 amps.
Form RZ-NA I-OPT-T (Version A), P/N 197264 (Rev 4), page 2
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