Control/conditions

Unit operation

Explanation

 

 

 

 

HEAT

When defrost operation

Non-stop defrost

Defrost operation begins based on outdoor heat

 

begins, frost has formed

 

exchanger temperature and outdoor air

 

on the outdoor unit

Indoor fan : Stopped

temperature conditions.

 

(when the ambient air

Non-stop defrost (Refer to Fig. 1)

 

temperature is low).

Outdoor fan : Stopped

1. After HEAT operation begins, the temperature

 

 

Compressor : 80 Hz

of the outdoor heat exchanger is at or below the

 

 

Solenoid valve (for hot gas bypass): ON

L1 line for 35 minutes.

 

 

(If outdoor air temperature is less than –3 °C,

 

 

4-way valve : Remains ON

 

 

the time is 48 minutes)

 

 

Operation lamp : Red and orange ON

2. After HEAT operation begins, the temperature

 

 

alternately

of the outdoor heat exchanger is at or below the

 

 

 

L2 line for 120 minutes.

 

 

 

The 4-way valve remains ON during defrost.

 

 

 

The outdoor fan stops and the solenoid

 

 

 

valve turns ON, allowing the refrigerant to

 

 

 

bypass the indoor unit.

 

 

 

The operating frequency during defrost is

 

 

 

80 Hz. (Frequency is lowered if the current

 

 

 

peak cut-off function is activated.)

 

 

 

The maximum length of a single defrost

 

 

 

operation is 12 minutes.

 

 

 

For the outdoor heat exchanger temperature

 

 

 

conditions for ending defrost, refer to Table 1.

 

 

 

 

 

Defrost release

Indoor fan turns ON.

 

 

 

After 10 seconds, the solenoid valve

 

 

 

(for hot gas bypass) turns OFF.

 

 

 

When the cold air feel has disappeared,

 

 

 

the indoor fan starts and gradually increases

 

 

 

speed until it reaches the set speed.

 

 

 

 

 

 

STOP

All indicator lamps turn OFF. The indoor and

 

 

[Clean defrost]

outdoor units stop.

 

 

Defrost is performed

 

 

 

when the outdoor unit is

 

 

 

stopped, and the

 

 

 

temperature of the

 

 

 

outdoor unit coil is at or

 

 

 

below the L1 line.

 

 

 

(Refer to Fig. 1.)

 

 

 

 

 

 

 

Operation is restarted

Starts operating in the same operating mode

Within 4 hours after operation was stopped, it is

 

within 4 hours (only when

(HEAT) and with the same temperature

assumed that there has been no significant

 

AUTO mode is selected

settings as before operation was stopped.

change in the indoor and outdoor temperatures,

 

with the remote

 

and the previous conditions (HEAT) are stored.

 

controller).

 

 

 

Operation starts after 4

New operation begins based on the

 

 

hours or more have

temperature conditions at the time the

 

 

passed.

ON/OFF button is pressed.

 

 

 

 

 

Outdoor heat exchanger temperature

(–20)

L2

L1

0Outdoor air temperature

(– 6) (– 7)

(– 24) (– 25)

Temperature of releasing

Defrost operation time

Less than 2 minutes

2 minutes or more

 

 

 

Heat exchanger

No releasing

14 °C or higher (*1)

temperature for

 

 

releasing defrosting

 

 

 

 

 

*1 The temperature for releasing of defrosting is (20 °C) or higher when the outdoor air temperature is less than 0 °C.

Fig. 1

Table 1

65

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Sanyo SAP-CMRV1926EH, SAP-CMRV1426EH-F service manual Temperature of releasing
Page 64 Page 66

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