Reznor B Option - Low Ambient Control Relay Installation User Manual

Option cq3 low ambient fan control relay, Description, Installation instructions

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Mfg No. 131134, Page 1

APPLIES TO:

Models F, FE, B, BE with a Single-Stage

Gas Valve

OPTION CQ3

LOW AMBIENT FAN

CONTROL RELAY

INSTALLATION FORM RZ-NA I-F/B-LA

Obsoletes Form RGM 434/436-LA (Version .2)

®

Description

Option CQ3, Low Ambient Fan Control Relay Kit, is designed

to prevent false cycling of the fan/blower on the unit heaters

installed in areas with ambient temperature of less than 40°F.

When the room temperature is below 40°F, the standard tem-

perature-activated fan control may be cooled enough by the ini-

tial airflow to cause the fan/blower to shut off. Since the burner

is still lit, the fan control will be reheated causing the fan/blower

to cycle on and off.
The optional time delay relay is actuated electrically, indepen-

dent of room temperature or heat exchanger temperature. On

heater start-ups, the time delay relay will start the fan/blower in

about 45 seconds. On heater shutdown, the time delay will con-

tinue to operate the fan/blower for about 60 seconds to cool the

heat exchanger. If the ambient temperature in the room is in-

creased during heater operation, the fan control will act to keep

the fan/blower on longer, until the heat exchanger is adequately

cooled.
IMPORTANT:

Do not remove the fan control from the heater

circuit. The fan control is a safety device.
The Option Package (P/N 113779) includes:

Qty

P/N

Description

1

114007 Time Delay Relay Assembly (consisting of

a time delay relay, Thermodisc #305055,

P/N 97479, and four wire assemblies)

2

82485

Screws, #4 x 3/8" long (for attaching relay

assembly)

1

16354

Wire Nut

1

98117

Open/Closed Bushings (required for units

with lower horizontal partition; not required

on units with cable holders - See Figure 1)

Installation Instructions

Installation should be done by a qualified agency in accordance

with these instructions and in compliance with all codes and

requirements of authorities having jurisdiction.
1.

If the heater is installed, turn off the gas and electric power.

2.

Remove the outer side panel on the left side of the heater (left

when facing the back of the heater), exposing the inner side

panel and wiring.

3.

On the vertical partition of the inner side panel, there are

three locations with holes for mounting relays. The relay in

this kit is designed to attach at the top set of holes (See Fig-

ure 1). Position the relay on the electrical compartment side

of the vertical partition. Attach, using the smaller holes and

the screws provided.

Figure 1 - Location for Mounting Low Ambient Fan
Control Relay

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.

Option CQ3, Low Ambient Fan Control Relay Kit

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