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

Page: 25 / 98

Water connections, Vented
Instruction Manual DR-FC 25
is
3.7 Water connections,
Vented
3.7.1 Cold water side
See
a
in Figure 3.3 .
1. Fit an approved stop valve
h
on the cold water side between the water
tank
o
and the water heater, as required by regulations. Refer also to
paragraph ’1.3 Regulations and documents’ .
3.7.2 Top to bottom recirculating pump
You can connect a top to bottom recirculation pump to prevent stratification of
the water ("stacking")in the water heater.
1. Fit a pipe (Ø 22 mm), a stop valve
c
and a top to bottom recirculation
pump
e
.
2. Fit non-return valve
d
.
3. Fit stop valves
h
.
3.7.3 Hot water side
See
b
in Figure 3.3 .
n
Remark
Insulating long hot water pipes prevents unnecessary energy loss.
1. Fit the safety valve
b
.
2. Optional: fit a temperature gauge
i
to be able to check the temperature of
the tap water.
3. Fit a stop valve
h
in the hot water outlet pipe, for use when servicing.
4. If a circulation pipe is to be fitted, then refer to paragraph 3.7.4 .
3.7.4 Circulation pipe
See
c
in Figure 3.3 .
If an immediate flow of hot water is required at draw-off points, a circulation
pump can be installed. This improves comfort and reduces water wastage.
1. Fit a circulation pump
e
of the correct capacity for the length and resistance
of the circulation system.
2. Fit a non-return valve
d
a downstream the circulation pump to guarantee the
direction of circulation.
3. Fit two stop valves
c
for service purposes.
4. Connect the circulation pipe to the cold water supply pipe.
3.7.5 Condensation drainage
See paragraph ’3.6.5 Condensation drainage’ .
3.8 Gas connection
Warning
Gas installation may only be carried out by an authorised installer in
compliance with the general regulations imposed by the gas company.
Refer also to paragraph
’1.3 Regulations and documents’ .
c
Note
Make sure that the diameter and length of the gas supply pipe are large
enough to supply sufficient capacity to the water heater.