DORCHESTER DR-LA 110, Руководство пользователя

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Water connections, Unvented
Instruction manual DR-LA 25
is
3.6 Water connections,
Unvented
3.6.1 Cold water side
See
a
in Figure 3.3 .
1. Fit an approved stop valve
i
on the cold water side as required by
regulations.
Refer also to paragraph
1.3 Regulations and documents .
2. The maximum working pressure of the water heater is 8 bar. The expansion
valve regulates the pressure to 5.5 bar. The operatiing pressure is 3.5 bar.
Fit an approved pressure-reducing valve
a
.
3. Fit a non-return valve
e
and an expansion vessel
b
.
4. Fit an expension valve
n
and connect the discharge to a drain via tundish.
3.6.2 Top to bottom recirculating pump
You can connect a top to bottom recirculation pump to prevent stratification of
the water in the water heater.
1. Fit a pipe (Ø 22 mm), a stop valve
d
and a top to bottom recirculation
pump
k
.
2. Fit non-return valve
e
.
3. Fit stop valves
i
.
3.6.3 Hot water side
See
b
in Figure 3.3 .
n
Caution
Insulating long hot water pipes prevents unnecessary energy loss.
1. Optional: fit a temperature gauge
j
to be able to check the temperature of
the tap water.
2. Fit the T&P valve
c
.
3. Fit a stop valve
i
in the hot water outlet pipe, for use when servicing.
3.6.4 Drain valve
1. Fit the standard drain valve supplied
g
.
2. If a circulation pipe is to be fitted, then refer to paragraph 3.6.5 . Otherwise,
fit the sealing nut and gasket supplied with the drain valve. See Figure 3.4 .
3.6.5 Circulation pipe
See
c
in Figure 3.3 . and Figure 3.4 .
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
f
of the correct capacity for the length and resistance
of the circulation system.
2. Fit a non-return valve
e
a downstream the circulation pump to guarantee the
direction of circulation.
3. Fit two stop valves for servicing
d
.
4. Connect the circulation pipe to the T-piece on the drain valve
g
. See
Figure 3.4 .
Figure 3.4 Drain valve
IMD-0122
c