Fedders ch1018bbd 用户指南
COOLING MODE
The indoor low-voltage thermostat connects the indoor unit
transformer “R” to “Y” and “O” of the outdoor unit defrost board. The
system reversing valve is in the energized position during the
cooling mode. The “O” terminal is powered, supplying power to the
reversing valve solenoid through the “rev” terminals. The low-
voltage Y terminal of the control will energize the contactor latch coil,
energizing the compressor and fan motor. The fan motor is wired
through the N/C points of the control board relay. The fan motor will
be energized with the compressor except during defrost.
transformer “R” to “Y” and “O” of the outdoor unit defrost board. The
system reversing valve is in the energized position during the
cooling mode. The “O” terminal is powered, supplying power to the
reversing valve solenoid through the “rev” terminals. The low-
voltage Y terminal of the control will energize the contactor latch coil,
energizing the compressor and fan motor. The fan motor is wired
through the N/C points of the control board relay. The fan motor will
be energized with the compressor except during defrost.
HEATING MODE
With the indoor thermostat system switch turned to heat, the
thermostat connects the indoor unit transformer “R” to “Y” at the
defrost board. The low-voltage “O” terminal is not energized. The
reversing valve solenoid is not energized (keeping the reversing
valve in the heat position). The “Y” terminal will energize the
contactor latch coil, energizing the compressor and fan motor. The
fan motor will be energized with the compressor except during
defrost.
thermostat connects the indoor unit transformer “R” to “Y” at the
defrost board. The low-voltage “O” terminal is not energized. The
reversing valve solenoid is not energized (keeping the reversing
valve in the heat position). The “Y” terminal will energize the
contactor latch coil, energizing the compressor and fan motor. The
fan motor will be energized with the compressor except during
defrost.
DEFROST MODE
When the outdoor coil refrigerant entering temperature falls below
30°F ± 2°F, an outdoor defrost thermostat closes. (This thermostat
is located on a coil tube.) When the thermostat closes, a timer on the
board will start (30, 60, or 80 min.). At the end of that time interval
the controller will start the defrost cycle regardless of the outside
temperature. During the defrost cycle the controller energizes the
reversing valve solenoid and de-energizes the outdoor fan. This
builds up heat on the outdoor coil during defrost. The defrost control
energizes the indoor auxiliary heat relays through “W2” (second-
stage heat) on the thermostat. When the defrost thermostat reaches
70°F ± 2°F or after 10 minutes, the defrost cycle will end. Defrost
time is limited to 10 minutes regardless of the coil temperature.
30°F ± 2°F, an outdoor defrost thermostat closes. (This thermostat
is located on a coil tube.) When the thermostat closes, a timer on the
board will start (30, 60, or 80 min.). At the end of that time interval
the controller will start the defrost cycle regardless of the outside
temperature. During the defrost cycle the controller energizes the
reversing valve solenoid and de-energizes the outdoor fan. This
builds up heat on the outdoor coil during defrost. The defrost control
energizes the indoor auxiliary heat relays through “W2” (second-
stage heat) on the thermostat. When the defrost thermostat reaches
70°F ± 2°F or after 10 minutes, the defrost cycle will end. Defrost
time is limited to 10 minutes regardless of the coil temperature.
DEFROST TIME SELECTION
The defrost control has three selectable time intervals (30, 60 and
80 minutes). The timing is to be set at either 60 or 80 minutes,
depending on the rate of frost accumulation. To change the time,
move the timer jumper wire to the post marked 60 for 60 minutes or
80 for 80 minutes.
80 minutes). The timing is to be set at either 60 or 80 minutes,
depending on the rate of frost accumulation. To change the time,
move the timer jumper wire to the post marked 60 for 60 minutes or
80 for 80 minutes.
DEFROST TEST PINS
The defrost control has test pins to speed up the defrost time setting
by a factor of 256.
To initiate a defrost cycle without waiting for the time to accumulate,
jumper the two test pins (marked test) together. If the coil
temperature is above 28°F, jumper the DFT (defrost thermostat)
terminals to simulate a closed thermostat. Defrost should begin after
14 seconds for a 60-minute setting, and 21 seconds for an 80-
minute setting. If the jumper is removed immediately when the
defrost cycle starts, the cycle will end when the defrost thermostat is
opened (coil above 70°F). If the test pins remain jumped and the
defrost thermostat is closed, the defrost will end in 2.3 seconds (10
minute default/256).
by a factor of 256.
To initiate a defrost cycle without waiting for the time to accumulate,
jumper the two test pins (marked test) together. If the coil
temperature is above 28°F, jumper the DFT (defrost thermostat)
terminals to simulate a closed thermostat. Defrost should begin after
14 seconds for a 60-minute setting, and 21 seconds for an 80-
minute setting. If the jumper is removed immediately when the
defrost cycle starts, the cycle will end when the defrost thermostat is
opened (coil above 70°F). If the test pins remain jumped and the
defrost thermostat is closed, the defrost will end in 2.3 seconds (10
minute default/256).
HIGH PRESSURE SWITCH LOCK-OUT
The defrost control board is equipped with a High Pressure Lock-
out. The high pressure switch is wired to the defrost control board.
This is a normally closed switch that opens if the high side pressure
exceeds 425 psi. and closes when this pressure drops back to
300 psi. If the switch is activated, a lockout relay, internal to the
defrost board, will de-energize the contactor “Y out” terminal to shut
down the compressor and outdoor fan.
out. The high pressure switch is wired to the defrost control board.
This is a normally closed switch that opens if the high side pressure
exceeds 425 psi. and closes when this pressure drops back to
300 psi. If the switch is activated, a lockout relay, internal to the
defrost board, will de-energize the contactor “Y out” terminal to shut
down the compressor and outdoor fan.
Reset High Pressure Lock-out: To reset the High Pressure Lock-
out, the indoor thermostat must be switched to the off position then
back to the Heat or Cool position. This will de-energize the “Y in”
terminal of the defrost board, resetting the lock-out relay of the
board.
out, the indoor thermostat must be switched to the off position then
back to the Heat or Cool position. This will de-energize the “Y in”
terminal of the defrost board, resetting the lock-out relay of the
board.
The outdoor unit uses an integrated defrost control to manage the
following control functions of the system:
following control functions of the system:
1.
Off and on functions of the outdoor fan during the defrost
and heating mode.
and heating mode.
2.
Off and on functions of the reversing valve during the defrost
and heating mode.
and heating mode.
3.
Off and on functions of the auxiliary heat relays during the
defrost mode.
defrost mode.
The control is a time-and-temperature type with selectable defrost
time intervals of 30, 60 and 80 minutes. 24 volts AC is used for
control circuit input and output. A SPNC relay controls the outdoor
fan motor. A lockout relay is also incorporated to lockout the
contactor 24-volt circuit when the high-pressure switch is
activated. Lockout can be reset by switching the indoor
thermostat off and back on.
time intervals of 30, 60 and 80 minutes. 24 volts AC is used for
control circuit input and output. A SPNC relay controls the outdoor
fan motor. A lockout relay is also incorporated to lockout the
contactor 24-volt circuit when the high-pressure switch is
activated. Lockout can be reset by switching the indoor
thermostat off and back on.
BASIC SEQUENCE OF OPERATION
DEFROST CONTROL DESCRIPTION
The information in this manual supersedes and replaces the previous instruction/operation manual with regard to split system heat pump
products. Illustrations cover the general appearance of the units at the time of publication and the manufacturer reserves the right to make
changes in design and construction at any time without notice.
products. Illustrations cover the general appearance of the units at the time of publication and the manufacturer reserves the right to make
changes in design and construction at any time without notice.
For replacement parts contact:
CareCo
415 Wabash Ave.
Effingham, IL 62401
Phone: 1-866-829-2440
CareCo
415 Wabash Ave.
Effingham, IL 62401
Phone: 1-866-829-2440