16 88-A4HP4001-1F-EN
Defrost controls have a selectable termination tem-
perature. As shipped, defrost will terminate at 47°F.
For a higher termination temperature, cut Jumper
J2 to achieve 70°F. See Service Facts shipped in
the outdoor unit for more information.
Pin Identification on J5 (See Illustration)
1. TEST_COMMON (Shorting to FRC_DFT
causes the control to initiate Forced Defrost.
Leaving this pin open results in the normal
mode of operation.)
2. FRC_DFT = Forced Defrost (Short TEST_
COMMON to this pin for two (2) seconds to
initiate a forced defrost. Remove the short
after defrost initiates.)
Defrost Control Checkout
Normal operation requires:
• Status LED on board flashing 1 time/second
in standby or 2 times/second with a call for
heating or cooling.
• 24V AC between R & B
• 24V AC between Y, Y0 & B with unit operating
• Defrost initiation when FRC_DFT pin is shorted to TEST_COMMON pin.
If a defrost control problem is suspected, refer to the service information in control box.
Defrost Board Detail
JPR2
JPR1
K1
J4
K2
K3
J9
J8
J3
J5
J2
J1
Jumper J2
J5 Test Pins
11.3 Defrost Control
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