Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 37

Primary circuit, type WW + WWS (two-stage...
Equipment required
Pos. Description
1 Heat pump stage 1 (type WW)
2 Heat pump control unit
9 Heat pump stage 2 (type WWS)
qT
Common primary pump
qZ Primary circuit flow temperature sensor (for installation, see page 84)
qU Primary circuit return temperature sensor (for installation, see
page 84)
qO Frost stat, primary circuit
wP Brine accessory pack
wQ Pressure switch, primary circuit
wW Heat exchanger, primary circuit
wE Flow limiter, well circuit (remove jumper before connecting)
wR Dirt trap
wZ Well pump (suction pump for groundwater; connect via on-site contactor
with fuse protection)
■ 230 V connection: See page 33
■ 400 V connection: See pages 38, 34.
wU Delivery well
wI Return well
Electrical connection
For further information regarding the
PCBs, see from page 220.
Preparing for installation
(cont.)
37