Maintenance; Pressure Drop Diagram - Nibe PUB2 Series Installation And Maintenance Instructions Manual

Maintenance

The safety valve must be checked regularly. Inspection
is made by turning the safety valve knob anti-clockwise,
upon which water should flow through the overflow
pipe. If this does not happen then the safety valve is de-
fective and must be changed.
The safety valve sometimes releases a little water after
hot water has been tapped. This discharge is caused
by the expansion of the cold water taken into the wa-
ter heater, resulting in a pressure increase, whereby the
safety valve opens.
Service
Contact the main contractor when a service is necessary.
You must then state the serial number (95) 14 digits.

Pressure drop diagram

Primary side (coil)
3
2
1
Flöde
0 500 1000
1500
Pressure drop
Tryckfall
kPa mmwp
kPa mm vp
25
2500
20
2000
15 1500
10
1000
l/h
5
500
0 0
0
PUB2 DS 300/500 Pressure drop over each coil
Emptying
Shutoff the charge flow to the coil.
■
Shutoff the incoming cold water.
■
Loosen the cover of the drain valve (8) and mount a
■
suitible hose.
During draining air must be let into the hot water heat-
er by loosening a hot water heater connection (42) or
a hot water tap. In order to ensure the water heater is
completely empty the hose connection must be com-
pletely tight and the outlet must be below the lowest
point of the heater.
When mounted in locations exposed to the risk of frost,
the hot water heater must be emptied whenever not in
operation. Freezing will result in the hot water heater
bursting.
PUB2/PUB2 DS
PUB2/PUB2 DS
3
2
4
1
500 1000
PUB2
Tryckfall
kPa mm vp
1. PUB2 160
15 1500
2. PUB2 210
3. PUB2 300/500
4. PUB2 DS 160/300/500
10
1000
5
500
0
0
Flow
Flöde
l/h
1500
GB
PUB2 DS
F
0 400 800
1200
3