Commissioning the heating system
5
Logamax plus GB162-65/80/100 - Subject to modifications resulting from technical improvements!
13
Unscrew the sealing cap (fig. 9).
5.1.1 Filling the heating system
Filling and refilling of the heating circuit must been
carried out by a method that has been approved by the
Water Regulation Advisory Scheme (WRAS), for the
type of heating appliances, i.e. Domestic (in-house)
Fluid Category 3. Non-Domestic (other than in-house)
Fluid Category 4. Depending on the Fluid Category the
approved method should comprise of the following:
Requirements Fluid Category 3 systems (fig. 10)
– Control valve (stop valve) including a double check
valve on the mains cold water supply pipe.
– Temporary connection to be removed after filling (fill-
ing loop).
– Control valve (stop valve) on the heating system
pipework.
Requirements Fluid Category 4 systems (fig. 11)
– Control valve (stop valve) on the mains cold water
supply pipe.
– Strainer.
– Water non return valve with Reduced Pressure Zone
(RPZ valve assembly) incorporating a Type BA air
gap.
– Tundish.
– Control valve (stop valve) on the heating system
pipework.
fig. 9
Removing cap from drain cock
fig. 10
System fill - category 3
Stop
cock
Mains
supply
Stop cock
Test cock
Temporary hose
Heating return
Hose
return
Non return
valve
Non return
valve
SYSTEM FILL
fig. 11
System fill - category 4
M
a
in
s
cold w
a
ter
S
top
cock
S
top
cock
S
tr
a
iner
RPZ
T
u
ndi
s
h
