Connecting The Heat Pump To The Indoor Unit; Connecting The Domestic Hot Water Cylinder's Heating Flow And Heating Return; Connecting The Building Circuit; Installing The Drain Hose On The Expansion Relief Valve - Vaillant VWL Series Operating Instructions Manual

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For heating installations with solenoid valves or thermo-
statically controlled valves, install a bypass with bypass
valve in order to guarantee a volume flow of at least 40%.
5.2

Connecting the heat pump to the indoor unit

2
1 G 1 1/4" connection,
heating return to the
heat pump
1. Blow or flush the supply pipes thoroughly prior to install-
ation.
2. Connect the heat pump to the hydraulic station.
3. Check whether the connections are leak-tight.
(→ Page 36)
5.3 Connecting the domestic hot water
cylinder's heating flow and heating return
2
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Connect the domestic hot water cylinder's heating return
(1) and heating flow (2) in accordance with the relevant
standards.
0020291544_01 Hydraulic Station Installation and maintenance instructions
1
2 G 1 1/4" connection,
heating flow from the
heat pump
1
Hydraulics installation 5
5.4

Connecting the building circuit

1. Connect the filling device with the enclosed seal to the
product's heating return.
2
2. Connect the building circuit's return (1) and flow (2) in
accordance with the relevant standards.
5.5 Installing the drain hose on the expansion
relief valve
1. Install a drain hose (1) on the expansion relief valve.
2. Install the expansion relief valve hose in a frost-free
environment and ensure that its routing ends in an open
drain where it is then visible.
3. Terminate the drain hose in such a way that escaping
water or steam cannot cause injury to persons or dam-
age to electrical components.
4. Open the expansion relief valve regularly in order to
remove scale deposition, and ensure that the device is
not blocked.
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