LIMIT
SWITCH
NO. 2
FLUE OUTLET
SECTION 2
GAS VALVE
FLUE
OUTLET
SECTION 1
GAS VALVE
LIMIT
SWITCH
NO. 1
NOTE: High heat consists of sections 1 and 2. Low heat consists of section 1 only.
LIMIT
SWITCH
NO. 1
FLUE
FLUEOUTLET OUTLET
SECTION 2
SECTION 1
GAS VALVE | GAS VALVE |
LIMIT
SWITCH 
NO. 2
NOTE: High heat consists of sections
| Fig. 1 — Heat Section Details |
|
|
LIMIT
SWITCH
NO. 1
FLUE
OUTLET
SECTION 2
GAS VALVE
FLUE
FLUEOUTLET OUTLET
SECTION 3
SECTION 1
GAS VALVE | GAS VALVE |
|
LIMIT
SWITCH
NO. 2
10.Using the scrolling marquee, enable the unit to run using the following procedure:
a.Push the ESCAPE key unit a blank display screen is shown.
b.Push the 
key until the SERVICE TEST LED is lit.
c.Push the ENTER key. The display will show STOP.
d.Push the ENTER key again. The NO/YES display will flash.
e.Push the 
or 
key to toggle the display to NO
and then push ENTER . The unit will return to
normal operation and exit SERVICE TEST mode.
11.To test the operation of the gas section, use the scrolling marquee Service Test routine to energize the gas outputs and to turn on the gas. Refer to the unit Controls, Start- Up, Operation, Service and Troubleshooting literature for more information.
12.For normal operation, make sure that units with a conven- tional thermostat are set to heating control temperature. On VAV (variable air volume) and constant volume units with a space temperature sensor, make sure that the set points are at the normal heat set points.
NOTE: High heat consists of sections
Fig. 1 — Heat Section Details (cont)
a48-8446
WARNING
If the main burners fail to light or the blower fails to start, shut down gas heating section and call your dealer for ser- vice. Failure to follow these requirements could result in serious personal injury.
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