Haier HR36D1VAR [11/41] Application

RELAYS

COMPREESSOR CONTACTOR

contacts ,while others use 2-pole or 3-pole contacts.

compressor and outdoor fan.

OPTIONAL DELAYS AND KITS

before re-starting the compressor.

Defrost PCB

START KITS(OPTIONAL)

This special relay uses the EMF generated by the compressor start windings to take a start capacitor out

of the circuit. The relay and its companion capacitor can start the compressor at low voltages and

against higher pressure, such as those caused by non-bleed port expansion valves.

compressor make a start kit unnecessary.

The coil uses 24 volts but the contacts carry line voltage .The heater contactor is a large relay,

which controls the compressor and the outdoor fan operation. Some contactor use single pole

Before specifying any air conditioning equipment, a survey of the structure and a heat gain calculation

The cooling load calculation determines the unit size. There are two capacities that enable the

must be made. A heat gain calculation involves identifying all surfaces and openings that gain heat from

the surrounding air and quantifying that heat gain. The heat calculation also calculates the extra

heaty load caused by sunlight and by humidity removal. These factors must be considered before

selection an air conditioning system to provide year round comfort. The Air Conditioning Contractors

cooling load.

6. APPLICATION

of America (ACCA) J Manual method of load calculation is one recognized procedure for determining the

Fig.5-2

Generally relays used in air conditioning use 24VAC coils. Contact voltage may be either low or line voltage.

Relays provide a method for control switching. Relays may switch either low(24VAC) or line voltage.

Single-pole contactors break only one side of the power feed to the compressor and outdoor fan. The other side

remains connected to the power source. The 2-pole or 3-pole contactor breaks power to all sides of the

CAUTION: WHEN THERE IS A SINGLE POLE CONTACTOR, ONE SIDE OF A 240 V.A.C.CIRCUIT

REMAINS HOT. THIS MEANS THAT THE WIRING IN THE HIGH VOLTAGE CIRCUIT MAY HAVE A

POTENTIAL OF 120V.A.C.TO GROUD. BEFORE SERVICING THE UNIT, ALWAYS TURN OFF

POWDER AT THE UNIT DISCONNECT SWITCH.

A Time-Delay in the compressor contactor lowcontrol circuit allows time for system pressure to equalize

This delay uses solid state circuitry to measure the time since the power was interrupted and is set for

approximately 3 minutes. It is not field adjustable. This is a delay on break timer.

Start kit components should match the recommended ratings and functions of those provided by the

Start kits are not normally required with scroll compressors. The operating characteristics of the scroll

reciprocating compressor manufactorer. See Specifications start components.

Sensible heat is the heat energy

measured on the dry bulb thermometer.

equipment to provide comfort. The first is sensible capacity.

Central Air Conditioning Model: Heat Pump, HR13-D1