Manual 7960-860A
Page
3 of 6
Sequence of Operation
Check for proper operation of the unit by energizing in
cooling mode. The condenser fan motor should not run
until the discharge pressure has exceeded 280 PSI.
Should the liquid pressure fall below 180 PSI while
running, the condenser fan motor will de-energize until
the head pressure again builds to 280 PSI. Switch to
heating mode. The condenser fan motor should run
anytime the compressor is running regardless of the
discharge pressure. Run unit through defrost cycle.
The condenser fan motor should de-energize during the
defrost cycle.
FIGURE 1
Unit Control Panel
MIS-4106
MULTIPLIER
RELAY
BLACK/WHITE WIRE TO C
BLACK WIRE TO RELAY
BLUE WIRE TO B
SCREWS
LOW AMBIENT CONTROL
CONNECT OD TEMP. SWITCH TO
TAB FROM MAIN WIRE HARNESS
PURPLE WIRE WITH INSULATED
(TERMINAL #1)
BLACK WIRES FOR LAC