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Form I-CAUA, P/N 164771 R8, Page 39

If there is a remote console (Option RC_) and there is a dirty lter indicator light on

the console, there is a dirty lter switch either in the optional mixing box or in the main

electrical compartment. After the unit is started, before continuous operation, the dirty

lter switch must be set.

FIGURE 31 - Dirty Filter Switch,

P/N 105507 (must be set prior to

continuous operation)

Set screw (on front of switch) must

be manually adjusted after the

system is in operation.

Negative pressure connection is

toward the “front or top” of the

switch (senses blower side of lters)

Positive pressure connection is

toward the “back or bottom” of the

switch (senses air inlet side of lters)

7.4.2 Dirty Filter

Switch

8.0 Ignition

System

A Model CAUA heater is equipped with a direct spark integrated control system. The

system monitors the safety devices and controls the operation of the blower and venter

motors and the gas valve.

Ignition System Operating Sequence

On a call for heat from the thermostat, the system energizes the venter motor and

goes through a 10-second prepurge. The system veries that the pressure switch has

changed states closing the normally open contactor and that the high limit is in the

closed state.

The gas valve is then energized, and the ignition system provides the high voltage

spark to the electrode to ignite the main burner gas. Burner ame is electronically

sensed by the control (minimum 1.0 microamps) upon carryover of all burners. (A sep-

arate solid metal probe is used as the ame sensing function. A low voltage electrical

signal is imposed on the metal probe which is electrically isolated from ground. When

the ame impinges on the ame sensing probe, the ame acts as a conduction path

to ground. The ame recties and completes the DC circuit, and the ignition system

acknowledges the ame.)

The blower motor is energized by the system after 30 seconds of ame sensing.

After the thermostat has been satised, the system de-energizes the gas valve, the

venter motor goes through a 45-second post-purge, and the blower motor remains

energized for an additional 135 seconds.

NOTE: This is a three trial system. The unit will lockout for one hour before initiating

another trial for ignition. If the unit fails after one recycle interval, the unit will go into

hard lockout and must be reset by interrupting power or resetting the thermostat. To

initiate another trial for ignition before the one hour interval, either reset the thermostat

or interrupt power to the unit for 30 seconds.

Instructions for Setting Dirty Filter Switch (FIGURE 31) - With clean lters in place;

all doors closed (except electrical compartment); and the blower opening, increase the

pressure setting by adjusting the setscrew on the switch clockwise until the lter light

is energized or the screw is bottomed out. At that point, adjust the setscrew three full

turns counter clockwise or until the screw is top ended. At that setpoint, the lter light

will be activated at approximately 50% lter blockage.

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