Armstrong Air RP14HP Series 설치 및 유지보수 지침 매뉴얼 - 페이지 8
{카테고리_이름} Armstrong Air RP14HP Series에 대한 설치 및 유지보수 지침 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Armstrong Air RP14HP Series 13 페이지.
페이지 인쇄A test option is provided for troubleshooting. The test mode
may be started any time the unit is in the heating mode and
the defrost thermostat is closed or jumpered. If the jumper
is in the TEST position at power up, the control will ignore
the test pins. When the jumper is placed across the TEST
pins for 2 seconds, the control will enter the defrost mode.
If the jumper is removed before an additional 5-second
period has elapsed (7 seconds total), the unit will remain
in defrost mode until the defrost thermostat opens or 14
minutes have passed. If the jumper is not removed until
after the additional 5-second period has elapsed, the
defrost will terminate and the test option will not function
again until the jumper is removed and reapplied.
Compressor Delay
The defrost board has a field-selectable function to reduce
occasional sounds that may occur while the unit is cycling
in and out of the defrost mode. The compressor will be
cycled off for 30 seconds going in and out of the defrost
mode when the compressor delay jumper is removed.
NOTE: The 30-second "off" cycle is not functional when
jumpering the TEST pins.
Time Delay
The defrost control includes a compressor timer, which
ensures the compressor is off for a minimum amount of
time between operating cycles.
The timed-off delay is 5 minutes long. The delay helps
to protect the compressor from short cycling in case the
power to the unit is interrupted or a pressure switch opens.
The delay is bypassed by placing the timer select jumper
across the TEST pins for 0.5 seconds.
Pressure Switch Circuit
High and low pressure switches are connected to the
defrost control board on heat pump models. Air conditioning
models have a high pressure switch installed in line with
compressor contactor coil (see Figure 7).
During a single demand cycle, the defrost control will
lock out the unit after the fifth time that the circuit is
interrupted by any pressure switch wired to the control
board. In addition, the diagnostic LEDs will indicate a
locked-out pressure switch after the fifth occurrence
of an open pressure switch (see Table 3).
The unit will remain locked out until power to the board
is interrupted, then re-established, or until the jumper
is applied to the TEST pins for 0.5 seconds.
NOTE: The defrost control board ignores input from the
low pressure switch terminals as follows:
•
During the TEST mode
•
During the defrost cycle
•
During the 90-second start-up period
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•
For the first 90 seconds each time the reversing valve
switches heat/cool modes
If the TEST pins are jumpered and the 5-minute delay
is being bypassed, the LO PS terminal signal is not
ignored during the 90-second start-up period.
Diagnostic LEDs
The defrost board uses two LEDs for diagnostics. The
LEDs flash a specific sequence according to the condition
as shown in Table 3.
Mode
No Power to Board
Normal Operation/
Power to Board
Anti-Short Cycle
Lockout
Low Pressure Switch
Fault
Low Pressure Switch
Lockout
High Pressure Switch
Fault
High Pressure Switch
Lockout
Table 3. Defrost Control Board Diagnostic LEDs
System Performance
This equipment is a self-contained, factory optimized
refrigerant system, and should not require adjustments to
system charge when properly installed. If unit performance
is questioned, perform the following checks.
Ensure unit is installed per manufacturer's instructions
and that line voltage and air flow is correct. Refer to
the following tables for proper performance value. The
indoor metering device varies by model; when checking
performance of a unit using an orifice for metering, refer to
the suction superheat value to judge performance. When
checking performance of a unit that uses an expansion
valve for metering, refer to the subcooling value to judge
system performance.
If the measured performance value varies from table value
allowance, check internal seals, service panels and duct
work for air leaks, as well as restrictions and blower speed
settings. If unit performance remains questionable, remove
Issue 1650
Green LED
Red LED
(DS2)
(DS1)
Off
Off
Simultaneous Slow Flash
Alternating Slow Flash
Off
Slow Flash
Off
On
Slow Flash
Off
On
Off
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