Armstrong Air RP14AC Series Manual de instruções de instalação e manutenção - Página 8

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A 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

Page 8 of 13

•

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

Simultaneous Slow Flash

Alternating Slow Flash

Off

Slow Flash

Off

Slow Flash

Off

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