Service manual

ESIE03–01 Overview of the cooling mode functions
Part 2 – Functional Description 2–29
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2.3 Freeze-Up Function
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 some specific conditions are fulfilled.
Graph
Field settings 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.
(*) Position of DSW2-4 irrelevant
Conditions 1 Factory settings
Position of DIP switch Activation
decided by…
Trigger
conditions
Remarks
DSW 2-3 DSW 2-4
OFF OFF Outdoor or
Indoor
Conditions 1 Factory set conditions.
ON (*) Indoor only Conditions 2 For use with EKRPER
OFF ON Outdoor only Conditions 3 Increased capacity for technical
room applications. Only to be
used in low latent heat applica-
tions (applications with low rela-
tive humidity)
DSW 2-3 DSW 2-4 Start Conditions (OR) Stop Conditions
OFF OFF
P Freeze-up start signal
received from indoor unit·
P Te ≤ -1°C for 25 min
accumulated compressor
operation time·
P Te ≤ A°C for 1 minute
continuous after = 8 minutes
continuous compressor
operation time·
P Te ≤ -1°C for 1 minute after
≥ 20 minutes continuous
compressor operation time
P Te > 10°C for 10 minutes
continuously