Technical information

33
DRAINING THE HEATING SYSTEM
The heating system must be drained as follows:
- Turn off the boiler;
- Attach a hose pipe and open the drain valve;
- Drain the system at the lowest points (where present). When
the heating system is unused for an extended period of time, it
is recommended that you add antifreeze with an ethylene glycol
base to the water in the heating pipe work and radiators if the
a
mbient temperature drops below 0°C during the winter.
T
his makes repeated draining of the entire system
u
nnecessary.
DR
AINING THE
DO
MESTIC
HO
T
WA
TER
SY
STEM
Whenever there is the danger of the temperature dropping
below the freezing point, the domestic hot water system must
be drained as follows:
- Turn off the general water valve for the household plumbing
system;
- Turn on all the hot water taps;
- Empty the remaining water from the lowest points in the system
(where present).
3.8 DRAINING THE SYSTEM
3.9 COMPLETION
F
or the Republic of Ireland it is necessary to complete a
“Declaration of Conf
ormity” to indicate compliance to I.S. 813. An
example of this is given in the current edtion of I.S. 813. In addition
it is necessary to complete the Commissioning Checklist.
3.10 OPERATIONAL CHECKS
1. The flue system m
ust be visib
ly checked for soundness.
2.
On Centr
al Heating allow the system to warm up and
manipulate the Central Heating temperature control knob, check
the burner modulates up and down between the high and low
settings;
3.
Range r
ate the ther
mal power for Central Heating, as detailed in
SECTION 4.2 (page 36);
4. Run the Domestic Hot Water, manipulate the Domestic Hot
Water temperature control knob to check the burner modulates
up and down between the high and low settings and check the
gas r
ate at the meter
;
5. Set the Domestic Hot Water flow rate;
6. Balance the Central Heating system until all return temperatures
are correct and equal;
7. Turn the ON/OFF button OFF, disconnect the gas pressure
gauge, retighten screw test for sondness and relight boiler.
8. Re-examine Central Heating, Domestic Hot Water and Cold
Water supplies for soundness.
9.
Chec
k the appear
ance of the gas flame to assess the adequacy
of the comb
ustion air supply
.
10.
If e
xter
nal controls have been disconnected, reconnect and test.
11.
Refit boiler casing.
ANTI-FROST DEVICE:
The boiler is fitted with a device which, in the event that the water
temperature falls below 3 ˚C, the burner ignites at the minimum
power until the boiler reaches a temperature of approximately 33˚C.
This device only operates if the boiler is functioning perfectly and:
- the system pressure is sufficient;
- the boiler is powered electrically;
- the gas is turned on.
PUMP /DIVERTER VALVE PROTECTION:
T
o prevent the pump and diverter valve from siezing the boiler will
activate the pump for 20 seconds every 21 hours after it’s last
operation and activate the diverter valve once.