Trane 5TWR5 Installation And Operation Manual page 12

11.3 Defrost Control - All Models except 036
Defrost controls have a selectable termination
temperature. 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.
11.3 Defrost Control - 036 Model ONLY
Defrost controls have a selectable termination temperature. As shipped, defrost will terminate at 47°F. For a
higher termination temperature, cut Jumper J2 to achieve 70°F when at or below 30°F ambient. See Service
Facts shipped in the outdoor unit for more information.
Pin Identification (See Illustration at right)
1. TEST_COMMON (Shorting any of the other pins to this pin causes the function of the other pin to be
executed. Leaving this pin open results in the normal mode of operation.)
2. TST = Test (Shorting TEST_COMMON to this pin speeds up all defrost board timings.)
3. 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:
•
LED on board flashing 1 time/second.
•
24V AC between R & B.
•
24V AC between Y & 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 Termination Temperatures
Outdoor
Temperature
>22°F
As
Shipped
10°F–22°F
6°F–10°F
Cut >30°F
Jumper 2
6°F–30°F
All < 6°F
12
Defrost Board Detail
Termination
Temperature
47°F
ODT + 25°F
35°F
47°F
70°F
12 min. or 35°F
every 3 hrs.
Jumper J2 J5 Test Pins
Defrost Board
Detail
JUMPER 2
TEST PINS
J1
J2
J3
FRC_DFT U1
TST
18-BC118D1-1A-EN