16.8 Water-water heat pump 2 compressors
SYMBOL ELEMENT CONNECTION
COND condenser
EV evaporator
AFR a secondary circuit anti-freeze resistance NO5 (TK)
AFR b primary circuit anti-freeze resistance NO4
HPS a high pressure switch ID1
LPS a low pressure switch ID2
TS a compressor 1 thermal switch ID3
TS b compressor 2 thermal switch AI4
(*)
TS thermal switch
ST a secondary circuit probe AI3
ST b primary circuit inflowing water probe AI1
ST c primary circuit outflowing water probe AI2
FS a primary circuit flow switch ID5
COMP a compressor 1 NO1
COMP b compressor 2 EXP
(**)
RV reversing valve NO3
WP a primary circuit water pump NO2
IW inflowing water
OHW outflowing hot water
OCW outflowing cold water
(*)
With AI4 configured as digital input.
(**)
Connection on extension.
COND
IW
OHW
ST a
RV
COMP a
TS a
FS a
ST c
OCW
EV AFR b
ST b
TS
IW
WP a
AFR a
HPS a LPS a
COMP b
TS b
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