Defrost Control (Only In Heating Opearation) - Carrier 30AWH004HB Service Manual

Defrost control (Only in heating opearation)

In heating operation, defrost operation is performed when TE sensor temperature satisfies any condition in A zone to D
zone.
a b
27'70'' 27'40''
29 29
34 40
39 45
A zone Defrost operation is performed in this zone when TE0-TE ≥ 3**** continued for T seconds**
B zone Defrost operation is performed in this zone when TE0-TE ≥ 3**** continued for T seconds**
C zone Defrost operation is performed when this zone continued for T seconds**
D zone Defrost operation is performed when this zone continued for T seconds**
* The minimum TE value between 10 and 15 minutes of compressor run time is stored inside the memory as TE0. TE0 is
calculated after each compressor restart in heating operation.
** 120 sec for sizes 004 , 006, 012
*** 2,5 for 004 and 006 sizes
****2,5 for 008 size
During the defrost:
The defrost operation is immediately finished if TE sensor temperature has become ε °C or more, or it also is also finished
when defrost operation has continued for τ minutes.
For 004, 006 and 008 sizes, defrost operation is also finished if TE is kept at+5°C or higher for 80seconds.
For 012 and 015 sizes, defrost operation is also finished if -7 ≤ TE < 12 has continued for 60 seconds.
After defrost operation has finished, the compressor and the outdoor fan start heating operation after stopped for approx.
50 seconds.
SM_30AW.indd 70
c d (A)
34' - -5
35 - -4
55 90 -5
55 150 -5
size 004 006 008
Є [°C] +8
τ [min] 15
Control management
(B) (C) (D)
-7 - -20
-6 -10 -25
-10 -13 -18
-10 -2 -23
012 015
+12
10
70
5
TE: Entering
(in Heat
exchanger)
temperature
TE0: minimum
TE value
calculated 10-
15 min. after
each
compressor
restart in
heating
operation
Size 004-006
Size 008
Size 012
Size 015
30AW
14-03-2011 14:45:19