Reznor LDAP offers flexible heating solutions for various applications. It features a two-stage thermostat with an auto/on fan switch and an off/auto system switch. The thermostat can be used for staged heating, where the first stage provides automatic fan recirculation without heat, and the second stage fires the unit at full fire. It also supports single-stage operation, where the first stage provides fan or blower recirculation only, and the second stage delivers full fire heat.
Reznor LDAP offers flexible heating solutions for various applications. It features a two-stage thermostat with an auto/on fan switch and an off/auto system switch. The thermostat can be used for staged heating, where the first stage provides automatic fan recirculation without heat, and the second stage fires the unit at full fire. It also supports single-stage operation, where the first stage provides fan or blower recirculation only, and the second stage delivers full fire heat.
Form RZ-NA I-OPT-T (Version A), P/N 197264 (Rev 4), page 1
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
Thermostat Options CL18 and CL7
Installation Form RZ-NA I-OPT-T (Version A)
Obsoletes Form RZ-NA I-OPT-T
®
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 applica-
tion from the table below and follow the appropriate instructions.
Kit Components
Two-Stage Thermostat
with Subbase
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)
Staged heat sections
- Based on the temperature settings,
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.
UDAP, UDAS, UDBP, UDBS,
and LDAP (all sizes) with
single stage gas valve(s)
(AG1)
Recirculation
and Single Stage Heat
- Based on the
temperature settings, first stage provides automatic fan or
blower only recirculation (no heat) and the second stage
fires the unit at full fire.
READ CAREFULLY AND
FOLLOW THE
INSTRUCTIONS ON THIS
SHEET.
Two stages of heat
- Based on the temperature settings,
the thermostat is used to provide two stages of heating by
controlling operation of the two-stage gas valve.
THIS INSTRUCTION SHEET
DOES NOT APPLY.
Discard this
sheet. Install the thermostat by
following the manufacturer’s
instructions that are provided with the
thermostat
and the wiring diagram on
the heater.
Be sure to comply with the
requirements for thermostat location.
Installation Instructions for Automatic Fan or Blower Only
Recirculation Control and Single-Stage Heating
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.
Installation
Instructions
Qty P/N Description
1
93436
Two-Stage Thermostat, Honeywell #T874F1130, with
Subbase, Honeywell #Q674C1009
1
123942
Thermostat Terminal Jumper
1
197264
Instruction Sheet, Form I-OPT-T
Qty P/N Description
1
93435
Two-Sta
g
e Thermostat, Hone
y
well #T874F1130 with Subbase,
Honeywell #Q674G
1
197264
Instruction Sheet, Form I-OPT-T
P/N 208945, Option CL7 Thermostat Kit for Model LDAP, UDAP, UDAS,
UDBP, or UDBS includes:
P/N 197265, Option CL18 Thermostat Kit for Model LDAP, UDAP,
UDAS, UDBP, or UDBS includes:
Form RZ-NA I-OPT-T (Version A), P/N 197264 (Rev 4), page 2
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
FIELD WIRING
FACTORY WIRING
R
W
G
Y
Y
PR
P3-4
P3-3
P3-2
P3-1
with Q674C SUBBASE
(OPT CL18) T874F THERMOSTAT
RH
W2
W2
W1
R
G
W1
TERMINAL STRIP ON
BACK OF HEATER
G
RC
INTEGRATED
CIRCUIT BOARD
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.
R
(UDBS or UDAS ONLY)
R
DOOR INTERLOCK
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.
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 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
FIELD WIRING
FACTORY WIRING
R
W
G
Y
Y
PR
P3-4
P3-3
P3-2
P3-1
(OPT CL7) T874F THERMOSTAT
R
W2
W2
W1
R
W1
TERMINAL STRIP ON
BACK OF HEATER
G
INTEGRATED
CIRCUIT BOARD
Set thermostat first stage anticipator at maximum
and second stage anticipator at 0.6 amps.
R
(UDBS or UDAS ONLY)
R
DOOR INTERLOCK
with Q674G SUBBASE
Installation Instructions for Automatic Fan or Blower Only
Recirculation Control and Single-Stage Heating (cont’d)
Form RZ-NA I-OPT-T (Version A), P/N 197264 (Rev 4), page 3
UNIT #2
FIGURE 2A -
LDAP 400
FIGURE 2B -
LDAP 800
Y2
Y1
C
TERMINAL STRIP
UNIT #1
R
PR
W2
R
W1
G
Y2
Y1
C
W2
R
PR
R
W1
G
TERMINAL STRIP
RC
R
W1
W2
G
W2
RH
W1
Q674C Subbase
(NOTES #1 & #2)
(Option CL18)
T874F Thermostat
Q674G Subbase
(NOTE #1)
(Option CL7)
T874F Thermostat
RH
RC
W2
W1
W2
W1
R
G
W2
W1
R
G
W2
R
G
W1
PR
R
PR
R
PR
R
Y2
Y1
C
UNIT #1
TERMINAL STRIP
Y2
Y1
C
TERMINAL STRIP
UNIT #2
Y2
Y1
C
TERMINAL STRIP
UNIT #3
G
FIGURE 2C -
LDAP 1200
R
W2
W1
Q674C Subbase
(NOTES #1 & #2)
(Option CL18)
T874F Thermostat
Q674G Subbase
(NOTE #1)
(Option CL7)
T874F Thermostat
FIELD WIRING
FACTORY WIRING
CRIMP TERMINAL
W.D.# 189848 LDAP THERMOSTAT WIRING
Option CL 7 or CL18 Recirculation Application
NOTES:
1) Set thermostat first stage anticipator at maximum
and second stage anticipator at 0.6 amps.
2) Jump thermostat terminals RH to RC and G to W1.
RC
TERMINAL
STRIP
Y2
Y1
C
W2
RH
W2
G
W1
R
W1
G
R
W1
W2
Q674C Subbase
(NOTES #1 & #2)
(Option CL18)
T874F Thermostat
Q674G Subbase
(NOTE #1)
(Option CL7)
T874F Thermostat
Form RZ-NA I-OPT-T (Version A), P/N 197264 (Rev 4), page 4
(800) 695-1901;
www.RezSpec.com
©2014 Reznor, LLC. All rights reserved. Printed in the U.S.A.
MANUFACTURER OF HEATING, COOLING, AND VENTILATING SYSTEMS
Trademark Note: Reznor
®
, TCORE
2®
, and
®
are registered in at least the United Sates.
0514 Form I-OPT-T (Version A.1)
CQS
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Reznor LDAP Installation guide
- Category
- Thermostats
- Type
- Installation guide
Reznor LDAP offers flexible heating solutions for various applications. It features a two-stage thermostat with an auto/on fan switch and an off/auto system switch. The thermostat can be used for staged heating, where the first stage provides automatic fan recirculation without heat, and the second stage fires the unit at full fire. It also supports single-stage operation, where the first stage provides fan or blower recirculation only, and the second stage delivers full fire heat.
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