DORCHESTER DR-FC 25, Installation, Commissioning And Maintenance Instructions

Page: 40 / 98

Filling and draining
40 Instruction Manual DR-FC
4
gis
Legend
a
pressure-reducing valve
(mandatory )
b
T&P valve (mandatory)
b
a) safety valve
c
stop valve (recommended)
d
non-return valve (mandatory)
d
a) non-return valve
e
circulation pump (optional)
f
drain valve
g
manual gas valve (mandatory)
h
stop valve (mandatory)
i
temperature gauge (optional)
j
condensation drainage
(mandatory)
k
hot water draw-off points
l
expansion valve (mandatory)
m
expansion vessel (mandatory)
n
3-way venting valve (optional)
o
water tank
p
float valve
a
cold water supply
b
hot water outlet
c
circulation pipe
d
gas supply
e
overflow pipe
Figure 4.1 Installation diagrams
IMD-0395
UNVENTED
c
c
c
e
d
a
d a
b
f
k
m
j
h
i
g
d
c
b
a
l
IMD-0396
VENTED
b
a
f
c
p
k
n
c d
a
e
j
c
o
h
i
g
e
d
c
b
a
c