Freeze-Up Function In Cooling Or Dry Keep - Daikin Sky Air R-407C Service Manual

ESIE02–01
2.3

Freeze-Up Function in Cooling or Dry Keep

Applicable units
Starting conditions In order to avoid formation of ice on the indoor heat exchanger in cooling and dry mode, the system
automatically starts up a freeze-up cycle when a number of specific conditions are fulfilled.
Starting conditions 1
Starting conditions 2 (FAYP indoor units)
Starting conditions 2 (not-FAYP indoor units)
Starting condition 3
Starting conditions 4
Starting conditions 5
A, B, C, D, E and F The table below contains the values of A, B, C, D, E and F in function of the DIP switch settings on the
outdoor PCB.
Mode
0
1
2
3
Part 2 – Functional Description
R(Y)P71-250B
FHYCP, FHYBP, FDYP, FUYP, FAYP and FHYKP
The compressor has been running for less than A min.
The integral cooling capacity decreases for 200 s continuously (see integral capacity calculation
further in this section).
Te < -1˚C for 1 min continuously (0˚C for FAY indoor units).
The compressor has been running for more than A min.
The integral cooling capacity decreases for B s continuously and Te < F˚C for 1 min continuously
(see integral capacity calculation further in this section), or
Te < -1˚C for 1 min continuously.
The compressor has been running for more than A min.
The integral cooling capacity decreases for B s continuously (see integral capacity calculation
further in this section).
Te < C˚C for 1 min continuously.
Te < D˚C for E min accumulated.
The compressor has been running for more than 1 min continuously while Te ≤ -5˚C.
→
Compressor ON OFF.
The compressor has been running for more than 8 min continuously while
the outdoor ambient temp. < -2.9 x room temp. + 79˚C.
The compressor has been running for more than 8 min continuously while Te < -5˚C for 1 min
continuously.
DIP switch
2-3 2-4
OFF OFF
ON
OFF ON
ON
Overview of the cooling mode functions
A B C
20 min 100 s -1˚C
8 min 0 s 0˚C
5 min +2˚C
D E F
-1˚C 25 min 0˚C
+1˚C 15 min
+3˚C +2˚C
2–27
1
2
3
4
5