Viessmann VITOCAL 300-G Technical Manual page 29

Design information
Two-stage heat pumps (type WW+BWS)
Two primary pumps
wE
wR
wZ wU
P Primary circuit interface (see system examples)
Equipment required
Pos. Description
1 Heat pump stage 1 with conversion kit water/water heat pump
2
Heat pump control unit
9 Heat pump stage 2
qT Primary pump (heat pump stage 1)
qZ Flow temperature sensor, primary circuit
qU
Return temperature sensor, primary circuit
qO Frost stat, primary circuit (component of conversion kit)
wP Brine accessory pack
wQ Pressure switch, primary circuit
wW Heat exchanger, primary circuit
wE Flow limiter, well circuit (component of conversion kit; remove jumper when connecting)
wR Dirt trap
wT Primary pump (heat pump stage 2)
wZ Well pump (suction pump for groundwater; connection via on-site contactor with fuse protection)
wU Delivery well
wI Return well
VITOCAL 300-G
(cont.)
wQ qZ
P P
wP
P
qU
wW
qO
wI
wT qT
2
9 1
3
VIESMANN
29