Day and Night HCH9 Installationsanleitung Handbuch - Seite 11

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Day and Night HCH9 Installationsanleitung Handbuch

INSTALLATION INSTRUCTIONS

Forced Defrost

On a system with non−communicating (non-Observer)

control, forced defrost can be initiated by manually shorting

the 2-pin header labeled FORCED DEFROST (see Fig 14)

on the control board for 5 seconds then releasing.

If coil temperature is at defrost temperature of 32

C), and outdoor air temperature is below 50

(10

C), a full defrost sequence will occur.

If coil temperature or outdoor air temperature does not

meet the above requirements, an abbreviated 30

second defrost will occur.

Quiet Shift−2

Quiet Shift−2 is a field−selectable defrost mode which may

eliminate occasional noise that could be heard at the start

and finish of the defrost cycle. For installations using a

standard 2−stage thermostat, this feature must be enabled

by selecting the 3

position dip switch on the outdoor control

board. For installations using an Observer Wall Control, it

must be enabled at the Wall Control. When activated, the

following sequence of operation occurs:

Defrost Initiation − the compressor is de−energized for 70

seconds. During this 70 second compressor off time, the

reversing valve will be energized. Once the 70 second

compressor off time has been reached, the compressor will

be energized then the outdoor fan will be de−energized at

which time the normal defrost cycle begins.

Defrost Termination − The outdoor fan will be energized

shortly before the compressor is de−energized for 60

seconds. During the compressor 60 second off time, the

reversing valve will be de−energized. Once the 60 second

compressor off time has been completed, the compressor will

be energized at which time the system will be in normal heat

mode.

Liquid−Line Accessory

In heat pump long−line applications, a liquid−line solenoid is

required to control refrigerant migration in the heating mode.

The solenoid should be installed near the outdoor unit with

the arrow facing the outdoor unit. This is the direction of flow

control. See application manual for long−line application

details.

Accessory Liquid Solenoid with Observer Communicating

Wall Control: When using the Observer Wall Control, the

liquid-line solenoid output is provided at the Y1 connection.

Connect the solenoid as shown in the wiring label diagram.

This is a 24vac output that is energized whenever the

compressor is energized. It closes, in the compressor off

mode, to prevent refrigerant migration into the unit through

the liquid−line.

On Systems with Accessory Liquid Solenoid Using a

Non−Communicating Thermostat: The liquid solenoid is

connected to the Y1 and C terminal connections. The liquid

solenoid closes, in the compressor off mode, to prevent

refrigerant migration into the unit through the liquid−line.

428 01 1703 01

TROUBLESHOOTING

If the compressor fails to operate with a cooling call, Table 4

can be used to verify if there is any damage to the

compressor windings causing system malfunction.

Winding

Start

(S−C)

Run

(R−C)

Systems Communication Failure

If communication with the Observer Communicating Wall

Control will flash the appropriate fault code. (See Table 6)

Check the wiring to the wall control, indoor and outdoor units.

Model Plug

Each control board contains a model plug. The correct model

plug must be installed for or the system to operate properly

(see Table 5).

Model

Number

*CH624

*CH636

*CH648

*CH660

*CH924

*CH936

*CH948

*CH960

The model plug is used to identify the type and size of unit to

the control.

On new units, the model and serial numbers are input into

the board's memory at the factory. If a model plug is lost or

missing at initial installation, the unit will operate according to

the information input at the factory and the appropriate error

code will flash temporarily.

A FAST® Parts replacement board contains no model and

serial information. If the factory control board fails, the model

plug must be transferred from the original board to the

replacement board for the unit to operate.

NOTE: The model plug takes priority over factory model

information input at the factory. If the model plug is removed

after initial power up, the unit will operate according to the last

valid model plug installed, and flash the appropriate fault code

temporarily.

Pressure Switch Protection

The outdoor unit is equipped with high and low pressure

switches.

If the control senses the opening of a high or low pressure

switch, it will respond as follows:

1. De-energize the appropriate compressor contactor.

2. Keep the outdoor fan operating for 15 minutes.

3. Display the appropriate fault code (see Table 6).

4. After a 15 minute delay, if there is still a call for cooling

and the LPS or HPS is reset, the appropriate

compressor contactor is energized.

5. If LPS or HPS has not closed after a 15 minute delay,

the outdoor fan is turned off. If the open switch closes

anytime after the 15 minute delay, then resume

operation with a call for cooling.

Specifications subject to change without notice.

R−410A Split System Heat Pumps

Table 4 − Winding Resistance

Winding Resistance At 705F +/− 205F

(21.115C +/− 11.115C)

1.64

1.52

1.86

1.30

0.88

0.52

Table 5 − Model Plug

Pin Resistance

(kOhms)

Model Plug

Number

Pin 1−4

HK70EZ041

HK70EZ043

HK70EZ045

HK70EZ047

HK70EZ010

5.1

HK70EZ012

5.1

HK70EZ014

5.1

HK70EZ016

1.63

0.39

Pin 2−3

150

220

360

120

180

270

5.1