Electrical Installation Scheme; Heat Pump Cascade: 1-Stage/2-Stage; Type Bw 301.B090 To 302.B250 And Ww 301.B125 To 302.B300 - Viessmann KWT Vitocal 300-G Pro Installation And Service Instructions Manual

Water/water cascade, 1-stage/2-stage
Primary circuit: Water/water, cascade, type WW 301.B125 to WW 302.B300
wR
----------
wU wZ wI
Fig.19
Equipment required
Pos. Designation
Heat pump I:
1
Integral heat pump control unit with LON communication module (accessory)
2 ■
Integral frost stat, primary circuit
■
Integral flow switch, well circuit
■
Heat pump II:
9
2-way motorised valve, heat pump I (fail-safe)
qT
Dirt trap
wR
2-way motorised valve, heat pump II (fail-safe)
wT
Well pump (suction pump for groundwater, fail-safe; connect to each heat pump via on-site contac-
wZ
tor with MCB/fuse protection)
Delivery well
wU
Return well
wI

Electrical installation scheme

For a summary of electrical connections, see from
page 37 and separate "Connection and wiring dia-
gram".

Heat pump cascade: 1-stage/2-stage

Type BW 301.B090 to 302.B250 and WW 301.B125 to 302.B300

A heat pump cascade consists of a lead heat pump
and lag heat pumps.
Each lag heat pump has a heat pump control unit.
Both the lead and lag heat pumps can have 2 stages.
(cont.)
M
--2/211.1--
wT
9
2
M --2/211.1--
qT
1
2
The lead heat pump regulates the operation of the
heat pumps within the cascade.
Preparing for installation
25