2. Processes and1.Specificationsfunctions

2-10 Defrosting Control, Outdoor Heat Exchanger Coil (Heating)

When the outdoor temperature is low, frost may form on the outdoor heat exchanger coil. When this occurred, the defrosting system operates. The microprocessor in the outdoor unit monitors the relationship between the temperature of the outdoor heat exchanger coil and the outdoor temperature so it can defrost when necessary.

Flow of Defrosting

Heating operation

No counting time for detecting frost : 15 minutes

Detecting the frost

Stand by time for defros:

25minutes

Defrosting

Release of defrosting

OUTDOOR COIL

 

TEMP.

 

C1 (°F)

 

 

Y “RELEASE OF

 

 

 

DEFROSTING”

 

50

 

RANGE

 

 

 

OUTDOOR AIR TEMP.

7.3

 

50

(°F)

 

X

27

 

 

 

 

 

18

 

 

 

 

 

The area below the heavy line

 

 

is the frost detection area.

 

 

–4

 

 

 

 

 

Either continuous 8 minutes or cumulative 60 minutes are required to detect frost in the “Frosting” range.

Refer to time chart.

*Minimum continuous operating time by defrosting is 48 minutes (= 15 + 8 + 25).

Occurs either when the temperature of C1 (the outdoor heat exchanger coil) has reached 50°F or above,

or when the maximum defrosting time (9 minutes) has elapsed.

Section

1

2

3

1143_THS_I

Time Chart for Defrosting

Fig. 13

 

 

1 MINUTE

 

 

MAX. 9 MINUTES

 

 

1 MINUTE

 

 

COMPRESSOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

ON

 

 

 

 

 

 

 

ON

 

 

SOLENOID COIL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

(4 WAY VALVE)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTDOOR FAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

ON

 

 

(H OR L)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INDOOR FAN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OFF OR LL

 

 

OFF

 

 

 

 

(SET SPEED)

 

 

 

 

 

 

 

 

OR LL

 

 

 

 

“STANDBY”

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“STANDBY” APPEARS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INDICATOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defrosting

 

 

 

Release of

0442_M_S Fig. 14

 

 

 

 

 

 

 

 

 

Start

 

 

 

Defrosting

During the defrost cycle, STANDBY appears on the remote controller.

*......Cold Draft Prevention may operate occasionally

SM830076

4

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Page 37
Image 37
Sanyo XHS2432, XHS3632, CH2432, CH3632 Defrosting Control, Outdoor Heat Exchanger Coil Heating, Time Chart for Defrosting

XHS3632, XHS2432, CH3632, CH2432 specifications

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