Installation
NOTE
Fit the enclosed cover discs before pipe installa-
tion. The cover discs, with self-adhesive backs,
must be installed on the relevant connection,
by pushing them over the connections.
All connections (including connections or holes
left by the lifting eyes that are not used) must
be insulated to minimise energy losses.
Pipe installation
NOTE
The water heater must be filled with water be-
fore charging via the charge coil is started.
Pipe installation must be carried out in accordance with
current norms and directives.
The water heater must be fitted with the requisite valves,
such as a safety valve, shut-off valve, non-return valve
and vacuum valve.
The water heater must be provided with a mixer valve,
which limits the temperature of outgoing hot water to
60 °C. If this valve is not fitted, some other measure must
be taken to prevent the risk of scalding.
Internal support bushes must be fitted when a plastic or
annealed copper pipe is used. An overflow pipe must be
routed from the safety valve to a suitable drain. The
overflow pipe must be the same size as the safety valve.
Route the overflow pipe from the safety valve, sloping
along its entire length and ensure that it is frost proof.
The mouth of the overflow pipe must be visible and not
placed close to electrical components.
Filling
Fill the water heater as follows:
1. Open a hot water tap in the system.
2. Open the shut-off valve on the incoming cold water.
This valve should then be fully open during opera-
tion.
3. The hot water tap can only be shut off when the
water heater is filled, which is when only water
comes out of the tap (initially an air-water mixture
comes out of the tap).
Charge coil
When determining the water speed, 1,5 m/s should not
be exceeded in the event of continuous charge flow.
This is equivalent to a water flow of approx. 1650 l/h for
a Ø22 mm charge coil (PUB2/PUB2 DS 160-500).
The supply temperature to the charge coil must not ex-
ceed 120 °C and the working temperature in the water
heater must not exceed 95 °C for PUB2 DS 160-300 and
90 °C for PUB2 DS 500.
The risk of air bubbles in the charge coil is eliminated
because the intake connection is the highest point.
Pressure drop diagram
Primary side (coil)
2. PUB2 DS 160/300/500
1. PUB300/PUB500
3. PUB160/PUB210
0
5
10
15
20
25
30
35
40
Pressure drop [kPa]
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
Charge flow [l/h]
Pressure drop over coil
1
2
3
Pressure drop over coil
Flow (l/h)
(kPa)
PUB2/PUB2 DS 160-500 | GB
20
