25
Primary circuit: Water/water, cascade, type WW 301.B125 to WW 302.B300
2
1
2
9
--211.1--
--230V--
qT
--2/211.1--
wT
wI
wZ
wR
--2/211.1;224.2
----------
wU
--
M
--2/211.1--
--224.2--
--211.1--
--230V--
--224.2--
M
Fig.19
Equipment required
Pos.
Designation
1
Heat pump I:
2
■
Integral heat pump control unit with LON communication module (accessory)
■
Integral frost stat, primary circuit
■
Integral flow switch, well circuit
9
Heat pump II:
qT
2-way motorised valve, heat pump I (fail-safe)
wR
Dirt trap
wT
2-way motorised valve, heat pump II (fail-safe)
wZ
Well pump (suction pump for groundwater, fail-safe; connect to each heat pump via on-site contac-
tor with MCB/fuse protection)
wU
Delivery well
wI
Return well
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.
The lead heat pump regulates the operation of the
heat pumps within the cascade.
Preparing for installation
Water/water cascade, 1-stage/2-stage
(cont.)
5549 984 GB
Installation
Summary of Contents for KWT BW 301.B090
Page 99: ...99 5549 984 GB...
