16.6 Air-water heat pump 2 compressors
SYMBOL ELEMENT CONNECTION
COND condenser
EV evaporator
AFR a primary circuit anti-freeze resistance NO4
HPS a high pressure switch ID1
LPS a low pressure switch ID2
TS a fan thermal switch ID4
TS b compressor 1 thermal switch ID3
TS c 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
OCW outflowing cold water
(*)
With AI4 configured as digital input.
(**)
Connection on extension.
EV
ST a
TS a
RV
COMP a
TS b
HPS a LPS a
TS
WP a
FS a
ST c
AFR a
COND
ST b
IW
OCW
COMP b
TS c
TK
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