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11.3 Defrost Control
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. Refer to the Defrost Control
section in this document 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.
Section 12. Electrical - High Voltage
12.1 High Voltage Power Supply
WARNING
!
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and
troubleshooting of this product, it may be nec-
essary to work with live electrical components.
Failure to follow all electrical safety precau-
tions when exposed to live electrical compo-
nents could result in death or serious injury.
The high voltage power supply must agree with
the equipment nameplate.
Power wiring must comply with national, state,
and local codes.
Follow instructions on unit wiring diagram located
on the inside of the control box cover and in the
Service Facts document included with the unit.
12.2 High Voltage Disconnect Switch
Install a separate disconnect switch at the outdoor unit.
For high voltage connections, flexible electrical conduit is recommended whenever vibration transmission may
create a noise problem within the structure.
88-A4HP4001-1G-EN
Defrost Board Detail
K2
K3
J9
J8
Jumper J2
J5 Test Pins
K1
J4
J3
J5
J2
J1
11
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