Whirlpool WPIO-299N Installation Manual download pdf (Page 10)

Final System Checks

1. Check to see if all supply and return air grilles are adjusted

and the air distribution system is balanced for the best

compromise between heating and cooling.

2. Check for air leaks in the ductwork. See “Airflow

Measurement and Adjustment” and “Checking Charge.”

3. Make sure that the unit is free of “rattles,” and the tubing in

the unit is free from excessive vibration.

4. Make sure that the tubes and lines are not rubbing against

each other or against the sheet metal surfaces or edges. If

contact is found, correct the trouble.

5. Set the thermostat at the appropriate setting for cooling and

heating or automatic changeover for normal use.

6. Check that the owner is instructed on the unit operation, filter,

servicing, correct thermostat operation, etc.

7. The previous sections are recommended to serve as an

indication that the unit will operate normally.

COMPONENTS

Contactor

This control is activated (closed) by the room thermostat for both

heating and cooling. The contactor has a 24-volt coil and

supplies power to the compressor and outdoor fan motor.

Crankcase Heater

This item is “ON” whenever power is supplied to the unit. It

warms the compressor crankcase thereby preventing liquid

migration and subsequent compressor damage. The insert type

heater is self-regulating. It is connected electrically to the

contactor L1 and L2 terminals.

Condenser Motor

This item is activated by the contactor during heating and

cooling, except during defrost and emergency heat operation.

Compressor

This item is activated by the contactor for heating and cooling,

except during emergency heat. It is protected by an internal

overload.

Contactor Relay

This control is activated by the thermostat (24-volt coil) and

supplies power to the contactor.

Defrost Control

The Defrost control provides time/temperature initiation and

termination of the defrost cycle. When a defrost cycle is initiated,

the defrost control shifts the reversing valve to Cooling mode,

stops the outdoor fan and brings on supplemental heat.

Normally, a defrost cycle will take only 2 to 3 minutes unless the

system is low on charge or outdoor conditions are severe (windy

and cold).

Outdoor Thermostat

These optional controls are used to prevent full electric heater

operation at varying outdoor ambient (0°F to 45°F [-18ºC to 7ºC]).

They are normally open above their set points and closed below

to permit staging of the indoor supplement heater operation. If

the outdoor ambient temperature is below 0° F (-18°C) with 50%

or higher relative humidity (RH), an outdoor thermostat (OT) must

be installed and set at (0°) on the dial. Failure to comply with this

requirement may result in damage to the product which may not

be covered by the manufacturer’s warranty.

Reversing Valve Coil

This coil is activated by the thermostat in the cooling mode and

during defrost. It positions the reversing valve pilot valve for

cooling operation.

Indoor Blower Motor

This is activated by setting the room thermostat to COOLING/

HEATING or FAN ON position. The motor is energized through

the EBTDR for PSC motors.

The X-13 motors are activated by setting the room thermostat to

COOLING/HEATING or FAN ON position. The motor is energized

by a 24-volt control signal (from thermostat Y, G or W). X-13

motors are constant torque motors with very low power

consumption. See “Airflow Measurement and Adjustment” for

speed adjustment instructions.

Blower Interlock Relay

This relay is used to energize the blower during the electric heat

operation. Some room thermostats do not energize the motor

during electric heat. This relay ensures blower operation when

the room thermostat energizes heat. This relay has a 240-volt coil

and an 8-amp contact relay. This relay is energized by the electric

heat kit sequencer.

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Whirlpool WPIO-299N Installation Manual Page 10

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