DORCHESTER DR-FC 25, Инструкции по установке, пусконаладке и обслуживанию

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Introduction
Instruction Manual DR-FC 39
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4 Filling and draining
4.1 Introduction
Topics covered in this chapter:
•
Filling the water heater .
• Draining the water heater .
The components referred to in these paragraphs are illustrated in Figure 4.1 .
4.2 Filling the water
heater
4.2.1 Filling unvented installations
To fill the water heater, proceed as follows.
1. Open the stop valve
h
in the hot water pipe and, if present, the stop valves
c
for the circulation pump.
2. Shut drain valve
f
.
3. Open the nearest hot water draw-off point
k
.
4. Open the supply valve
c
on the cold water side
a
so that cold water flows
into the water heater.
5. Completely fill the water heater (when cold water flows at normal pressure
from the nearest hot water draw-off point, the water heater is full).
6. Bleed the entire installation of air, for example by opening all hot water draw-
off points.
7. The water heater is now under water supply pressure. There should be no
water coming out of the expansion valve
l
nor the T&P valve
b
. If this does
happen, the cause might be:
-
The water supply pressure is greater than the specified 3.5 bar.
Check the correct pressure.
- The expansion valve in the protected cold supply setup is defective or
incorrectly fitted.
4.2.2 Filling vented installations
To fill the water heater, proceed as follows.
1. Open the stop valve
h
in the hot water pipe and, if present, the stop valves
c
for the circulation pump.
2. Shut drain valve
f
.
3. Open the nearest hot water draw-off point
k
.
4. Open the supply valve
c
on the cold water side
a
so that cold water flows
into the water heater.
5. Completely fill the water heater (when cold water flows at normal pressure
from the nearest hot water draw-off point, the water heater is full).
6. Bleed the entire installation of air, for example by opening all hot water draw-
off points.
7. The water heater is now under water supply pressure. There should be no
water coming out of the safety valve
b
a. If this does happen, the safety
valve might be defective or incorrectly fitted.
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