Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 112

Compact heat pump with electric drive single and two-stage, type bw/bws, ww/wws
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Installation sequence
Power supply
D Control unit power supply
E Main isolator
F High tariff meter
G Ripple control receiver (contact
open: power-OFF enabled) with
backup fuse
Two stage (type BW/BWS)
X3.7
A
X3.6
3
D
E
3
kWh
3/N
F
G
4
Shown excluding fuses and RCD.
A Heat pump control unit (for connec-
tion on cross connect PCB, see
page 225)
B Instantaneous heating water heater
(on site)
C Heat pump compressor stage 1
(type BW)
112
(cont.)
4
K
H Low tariff meter
K TNC system feed
C
B
5
3
kWh
3/N
H
4
D Control unit power supply
E Main isolator
F High tariff meter
G Ripple control receiver (contact
open: power-OFF enabled) with
backup fuse
H Low tariff meter
L
4
4

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