19
is energized which closes contacts of relay. There will be a time
delay. This completed circuit energizes all heating elements HTR
and blower motor.
B. Heat Pump
COOLING
On a call for cooling, the thermostat makes circuits R--O, R--Y, and
R--G. Circuit R--O energizes reversing valve, switching it to
cooling position. Circuit R--Y energizes contactor starting outdoor
fan motor and compressor. Circuit R--G energizes indoor unit
blower relay starting indoor blower motor.
When thermostat is satisfied, its contacts open de--energizing
contactor reversing valve and blower relay. This stops compressor
and fan motors.
HEATING
On a call for heating, the thermostat makes circuits R--Y and R--G.
Circuit R--Y energizes contactor starting outdoor fan motor and
compressor. Circuit R--G energizes indoor blower relay starting
blower motor.
Should temperature continue to fall, R--W circuit is made through
second--stage room thermostat bulb. Circuit R--W energizes a
sequencer bringing on supplemental electric heat.
When thermostat is satisfied, its contacts open de--energizing
contactor and sequencer. All heaters and motors should stop.
*
* Louvered Grill Cover is an accessory
A14213
Fig. 14 -- FFMA (sizes 18 & 24) Expanded View-- Case
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