Nibe VVM 300 - Emptying the Hot Water Heater; Draining the Heating System

18 NIBE VVM 300
Installation
Service
Emptying the hot water heater
To empty the heater proceed as follows:
Disconnect the overflow pipe from the drain connec-
■
tion (79) and connect a hose to a draining pump in-
stead. Where no draining pump is available, the water
can be released into the overflow cup (99).
Open the safety valve (47).
■
Open a hot water tap to let air into the system. If this ■
is not enough, undo a pipe coupling (74) on the hot
water side and pull out the pipe.
Draining the heating system
The hot water can be drained off through drain valve (51)
using an R15 (1/2") hose coupling. Remove the cover (80)
from the valve. Now screw on the hose coupling and open
valve (51).
Open safety valve (52) to let air into the system.
Service