9
Viscount GTS -
Installation & Servicing
INSTALLATION
586mm
150mm
2" tapped sludge
removal hole
VIS9133
NOTE:
Never replace a boiler in an existing system without
carefully rinsing the system first. Install a sludge trap
on the return pipe, very close to the boiler.
6
SLUDGE REMOVAL
A tapped ø 2" hole with a plug has been provided on the
bottom of the front of the boiler. Fit a quarter-turn valve on
the opening to remove the sludge.
Sludge removal leads to the draining of large quantities
of water, so remember to refill the system after the
operation.
5
FILLING THE SYSTEM
Filling shall be performed with a low flow rate from a low point
in the boiler room in order to ensure that all the air in the boiler
is bled from the high point of the system.
Always stop the pump before filling.
VERY IMPORTANT :
Instructions for starting up the boiler for the first time after
the system is fully or partly drained :
If all the air is not bled naturally to an expansion vessel which
opens out onto the air, the system must include manual
bleeder valves, in addition to automatic bleeder valves with the
capability to bleed the system by themselves when it is
operating. The manual bleeder valves are used to bleed all the
high points of the system and to make sure that the filled
system is free of air before the burner is turned on.
General
Recommendations relating to the water system are contained
in BS. 5449 Pt. 2 and BS. 6880.
INST
ALLA
TION
