Reversing Valve Defrost - Hitachi RAS-25CNH1 Service Manual

More than DFTIM
Fan speed
"Hi" setting
Start/Stop switch
Defrost signal
Preheating OFF
Preheating judgement
Hi
Med
Indoor fan
Lo
Super Lo
Lo
Outdoor fan
Operation lamp
Reversing valve
(Power ON mode
in heating)
WMAX
SGMNRP
0
Note:
(1) The DEFROST inhibit period is DFTIM. After DEFROST is completed, defrost signal is not accepted for
DFTIM. However, first inhibit period is fixed at 40 ninutes.
(2) If the temperature difference between the room temperature and set temperature is great after the DEFROST
is completed, compressor can keep maximum rotation speed (WMAX) for up to 120 minuets.
(3) DEFROST period is a maximum 12 minutes.
(4) When operation is stopped during DEFROST, the mode switches to AUTO FRESH DEFROST.
(5) AUTO FRESH DEFROST does not work within 15 minutes after the operation is started or after DEFROST is
completed.
Note:
1. Refer to data in Table 1 on page 41 for each constant shown in capital letters in the diagram.
2. In the diagram, ' attached to the top right of number mean minute,

Reversing valve defrost

Defrost
period
Deceleration
period
Max. 12'
TDF TDF TDF
TDF
411 412 413
421
TDF
422
3000
2400
1950
– 53 –
More than 15'
30' 30'
Stop
10'
Lo
30'
TDF4
31 Max. 3'
1'
3000
AUTO FRESH DEFROST
15'
Defrost
period
3' Max. 12'
1'
3000
" means second. (ex. 30', 15")