Manual

(2) When the heating setpoint has been satisfied ......... :

The compressor and condenser fan will de-energize im-

mediately. The indoor blower motor will have a delay off

and will de-energize after 30 seconds.

Defrost Mode:Energized (R,G,Y) De-energized (O) Defrost

Sensor Closed

(1)

On a call for defrost .........

When the defrost sensor closes in the heating mode,there

is a 30, 60 or 90 minute delay before the defrost mode be-

gins. This delay is selected by the position of a jumper on

the defrost board

In normal defrost mode, the following sequence will occur

after the set delay:

1. Condenser fan off.

2. Reversing valve energized to cooling and auxiliary elec-

tric heat ("W" circuit) is energized.

3. After defrost sensor opens ora maximum of 10 minutes;

the condenser fan is energized immediately. After a 10-12

second delay the reversing valve is then de-energized to

the heat mode. Electric strip heat is also de-energized ex-

cept as required by thermostat.

To check out the defrost mode, place jumper across the two

tabs marked "DF". This simulates the defrost sensor clos-

ing. The delay can be by- passed by jumpering the test pins

on the defrost control board (this reduces the delay from 30

minutes to 7 seconds, from 60 minutes to 14 seconds and

from 90 minutes to 21 seconds). In the defrost mode the

reversing valve will energize and the condenser fan will

de-energize.

NOTE: If the jumper on the defrost delay selection is left in the

"TEST" mode, the board wil! default to 90 min. delay until power is

off.

(2) When defrost has been completed .........

This condition will be maintained until the defrost sensor

opens or until the defrost mode operates for 10 minutes (or

2 seconds iftest pins are jumpered), whichever comes first.

Adding Accessories

Low/High Pressure Controls

This unit is equipped with extra low and high pressure ports lo-

cated inside the unit panel where the external high and low pres-

sure ports are installed. This allows for installation of high and low

pressure controls or low ambient controls.

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