Allied ML14XP1-060 Manuale di istruzioni per l'installazione - Pagina 14

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IMPORTANT

After testing has been completed, properly reposition

test jumper across desired timing pins

Service Light Connection

The defrost control includes terminal connections for a

service light which provides a signal that activates the

room thermostat service light during periods of inefficient

operation.

Defrost Control Diagnostic LEDs

The defrost board uses two LEDs for diagnostics. The

LEDs flash a specific sequence according to the condition.

TABLE 3

DEFROST CONTROL (CMC1) DIAGNOSTIC LEDs

Defrost Board Diagnostic LEDs

Green LED

Red LED

(DS2)

(DS1)

OFF

Simultaneous slow

FLASH

Alternating Slow FLASH

Slow

FLASH

Fault & Lockout Codes

Slow

OFF

FLASH

OFF

Slow

OFF

FLASH

OFF

High Pressure Switch (S4)

This unit is equipped with a high pressure switch which is

located on the liquid line. The SPST, normally closed pres-

sure switch opens when liquid line pressure rises above

the factory setting of 590 + 15 psig and automatically re-

sets at 418 + 15 psig.

If the high pressure switch opens 5 times during a single

thermostat demand, the defrost control will lock out the

compressor.

Low Pressure Switch (S87)

This unit is equipped with a low pressure switch which is

located on the suction line. The SPST, normally closed

pressure switch opens when the suction pressure drops

below the factory setting of 25 PSIG +/- 5 PSIG and auto-

matically resets at 40 PSIG +/- 5 PSIG. If the low pressure

switch opens 5 times during a single thermostat demand,

the defrost control will lock out the compressor. The de-

frost control has an on-board thermistor and will ignore the

pressure switch when the outdoor temperature is below

approximately 15 degrees F.

Resetting Defrost Control High and Low Pressure

Switch Lockout

The defrost control will lock out the compressor if the

high or low pressure switch opens 5 times during a single

Condition

No Power to Control

Normal Operation /

Power to Control

5-min Anti-Short-Cycle Delay

Low Pressure Switch Ignored

(Low Ambient)

Low Pressure Switch Fault

Low Pressure Switch Lockout

High Pressure Switch Fault

High Pressure Switch Lockout

thermostat demand. To reset a 5-strike pressure switch

lockout, cycle 24V control power to the defrost control or

place the defrost control in the "TEST" mode by shorting

the "TEST" pins for 2 seconds.

Homeowners Information

Before attempting to perform any service or maintenance,

turn the electrical power to unit OFF at disconnect switch.

In order to ensure peak performance, your system must

be properly maintained. Clogged filters and blocked air-

flow prevent your unit from operating at its most efficient

level. The system should be inspected and serviced be-

fore each cooling and heating season by a licensed pro-

fessional HVAC service technician (or equivalent).

Your new heat pump has several characteristics that you

should be aware of:

• Heat pumps satisfy heating demand by delivering large

amounts of warm air into the living space. This is quite

different from gas- or oil-fired furnaces or an electric fur-

nace which deliver lower volumes of considerably hotter

air to heat the space.

• Do not be alarmed if you notice frost on the outdoor coil

in the winter months. Frost develops on the outdoor coil

during the heating cycle when temperatures are below

45ºF (7ºC). An electronic control activates a defrost cy-

cle lasting 5 to 15 minutes at preset intervals to clear the

outdoor coil of the frost.

• During the defrost cycle, you may notice steam rising

from the outdoor unit. This is a normal occurrence. The

thermostat may engage auxiliary heat during the defrost

cycle to satisfy a heating demand; however, the unit will

return to normal operation at the conclusion of the de-

frost cycle.

Homeowner Maintenance

The following maintenance may be performed by the

homeowner.

• Contact a licensed professional HVAC technician to

schedule inspection and maintenance appointments for

your equipment before each heating and cooling sea-

son.

• Check the indoor unit filter each month and replace the

filter, if necessary.

• Have your dealer show you where your indoor unit filter

is located. It will be either at the indoor unit (installed

internal or external to the cabinet) or behind a return air

grille in the wall or ceiling. Check the filter monthly and

clean or replace it as needed. Disposable filters should

be replaced with a filter of the same type and size.

Page 14

CAUTION

Heat Pump Operation