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17
Air Circulation Blower
Gas Valve
Ignitor
Pressure Switch
(N.O. Contacts)
Combustion Blower
Thermostat
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OPEN
CLOSED
CLOSED
OPEN
Seconds 0 34 38 110 0 90
Thermostat ON
Gas Valve Opens
Ignitor OFF
Air Blower ON
Thermostat OFF
Combustion Product
Purge Ends.
Air Blower OFF
Combustion
Blower OFF
Figure 12
Timing Chart for Normal Robertshaw Operation (PGB & PGC)
Figure 13B
PGC Timing Chart for Normal Cooling Operation
On
Off
On
Off
On
Off
Seconds 0 30 0 30
(approx.) (approx.)
Indoor Fan
Outdoor Fan
and
Compressor
Thermostat
Figure 13A
PGB Timing Chart for Normal Cooling Operation
On
Off
On
Off
On
Off
Seconds 0 15 0 45
(approx.) (approx.)
Indoor Fan
Outdoor Fan
and
Compressor
Thermostat