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507788-01C mrcool.com Page 17 of 20
1. Set thermostat to call for auxiliary heat (approximately
minimum of 3 minutes for all sequencers to cycle on.
2. Set the thermostat so that it does not call for heat.
Operation
When the thermostat calls for cooling, 24 volts is put on
relay energizes. The normally open contacts close, causing
R
and Y is completed, closing the circuit to the contactor in
the outdoor unit, starting the compressor and outdoor fan
motor.
On heat pumps, circuit R and O energizes the reversing
reversing valve remains energized as long as the
COOL position.)
and outdoor unit should cycle off. Air handler should cycle
off 45 seconds after the outdoor unit shuts off.
R
and W is completed, and the heat sequencer is energized.
W
on the thermostat sub-base, or they may also be connected
to a second stage on the sub-base.
When the thermostat calls for heating, 24 volts is applied to
R and Y is completed, closing the circuit to
the contactor in the outdoor unit, starting the compressor
and outdoor fan motor.
If the room temperature continues to decrease, the circuit
R and W1 is completed by the second-stage heat
room thermostat. Circuit R-W1 energizes a heat sequencer.
W1 on the
thermostat. They may also be connected to a second
heating stage W2 on the thermostat sub-base.
W2 and E
on the thermostat sub-base so that the electric heat control
Maintenance
excessive dirt and dust. The MAHM*ETA units are shipped
IMPORTANT
•
cause of inadequate heating or cooling performance.
•
•
sized for it.
•
Professional Maintenance
unit.
(less than 50psi). If the coil cannot be cleaned using
thoroughly after cleaning.
(salt).
NOTICE
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