Bryant 453 Operations Instructions download pdf (Page 7)

Parts Function

Combination Control

The 400 Series refrigerators util-

ize a single combination control to

determine and regulate the mode

of operation (gas or electric). The

control is operated by two knobs.

The first is to select the operating

mode (gas or electric), and the

second is to control the thermostat

setting. The control consists of a

gas shut off valve, safety valve,

thermostat and electric interlock.

The interlock prevents the possi-

bility of operating on gas and

electric at the same time.

The safety valve is built into the

combination control and is de-

signed so that any loss of flame

will stop the gas flow to the

burner. It is controlled by means

of a thermocouple positioned in

the gas flame. As long as a flame

is detected by the thermocouple,

the valve is held open. Upon

flame failure (empty propane tanks

blowout, etc.) the valve closes,

shutting off the gas flow. To light

or relight the refrigerator, the gas

control knob must be pushed

and held in until the ignition es-

tablishes a flame. See "Lighting

Instructions" on refrigerator.

Note:

The combination control does

not have an "OFF" position on the

thermostat dial. To check the gas

pressure for low fire, set the

thermostat to the warmest posi-

tion, and cool the thermostat capil-

lary tube by use of a component

coolant or by placing it in a glass

of ice water. This forces the control

to low fire. To check for the high

fire pressure set the thermostat to

the coldest position and allow the

capillary tube to get warm.

In the normal gas mode, the

combination control modulates the

gas pressure to the burner. It

modulates between high fire and

low fire pressures in response to

the cabinet temperature sensed by the thermostat capillary tube. This

modulating burner pressure controls the burner efficiency and in turn, the

cooling in the cabinet.

In the normal electric mode, the thermostat opens and closes the microswitch

in response to the cabinet temperature sensed by the same capillary tube. The

switch contacts will always be closed when the capillary tube temperature is

above 50°F. An open switch at this temperature would indicate a broken capil-

lary tube, defective switch or the mode indicator shaft is depressed or hung up.

Ignition Switch

When the ignition switch is turned on, 12 volt DC is applied to the relighter

(provided 12 volt DC is supplied to the refrigerator).

Figure 3.8 Ignition Switch

Capillary Tube

Control Terminals

Burner Tube Connection

LP Gas Input Connection

Selector Switch and

Safety Valve

Thermostat

Burner Pressure Tap

Figure 3.7 Combination Control

B101

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Bryant 453 Operations Instructions Page 7

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