9.19
DRAINING THE APPLIANCE
Refer to Figur
es 21, 46 and 53
a)
Befor
e draining, give the appliance a brief CH demand.
b)
Ensur
e supply voltage is isolated.
c)
If not draining the entir
e CH system, close the CH flow and CH
return water isolating cocks.
d)
Drain down the CH system fr
om the external drain point, and
drain the boiler using the manual drain tap on the CH flow water
isolating cock (figure 21), in conjunction with the manual air vent
located on the top LHS of the heat exchanger; refer to Figures 46
and 53.
53
38
