Reznor UDBS Option - Installation - Thermostat Option User Manual

Page 2

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

P3-4

P3-3

P3-2

P3-1

with

Q674C

SUBB

ASE

(OPT CL18)

T874F

THERMOST

TERMINAL STRIP ON

BACK OF HEATER

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.

(UDBS or UDAS ONLY)

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)