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

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Checking the supply pressure and burner pressure
Instruction Manual DR-FC 33
is
3.11 Checking the supply
pressure and burner
pressure c
Note
Before you start up the water heater and/or begin to check the supply
pressure and burner pressure, you must first fill the water heater.
Please refer to paragraph
’4.2 Filling the water heater’ for filling
instructions.
c
Note
Before starting-up for the first time, and following conversion, you
must always check the supply pressure and burner pressure. If
necessary, adjust these to be certain of optimum performance of the
water heater.
c
Note
The easiest way to check the gas pressures is by using two pressure
gauges. This procedure assumes that these two gauges are available.
To check the supply pressure and burner pressure, proceed as follows:
1. Disconnect the water heater from the power supply. See paragraph
’7.3.2 Isolate the water heater from the power supply’ .
2. Undo the screws of the covers.
3. Carefully remove the black covers from the water heater.
The electrical section is now visible.
4. There are 2 test nipples on the gas control ( Figure 3.13 ) for measuring the
supply pressure
@
and the burner pressure
#
respectively.
Sealing screws are located inside the test nipples. Loosen both sealing
screws by a few turns. Do not loosen them completely; this makes them
difficult to tighten again.
5. Connect a pressure gauge to the lower pressure test nipple
#
.
6. Open the gas supply and vent the gas supply line via the upper nipple
@
.
7. Connect a pressure gauge to the upper test nipple as soon as gas starts to
flow from this nipple.
8. Switch on the power to the water heater using the isolator on the water
heater.
9. Turn the control panel ON by setting the 0/I switch to position I .
Figure 3.7 control panel