Morco GB24 - Boiler Operation Modes; Winterisation Guidelines

7
SECTION 1 - USERS INSTRUCTIONS
1.8 OPERATION
Winter Conditions - (Central Heating and Domestic Hot Water required)
Set the mode knob (C) to ‘ ’ (winter).
The boiler will re and supply heat to the radiators but will give
priority to domestic hot water on demand.
Summer Conditions - (Domestic Hot Water only required)
Set the mode knob (C) to ‘ ’ (summer).
Set the central heating demand on the external controls to OFF.
Boiler Off
Set the mode knob (C) to ‘OFF’. The boiler mains power supply
must be left on to enable frost protection (see Frost Protection).
Note.Thepumpwilloperatebrieyasaself-checkonceevery24
hours, regardless of system demand.
Control of water temperature
Domestic Hot Water
The DHW temperature is limited by the boiler controls to
65
o
C maximum at low draw-off rate, adjustable via the DHW
temperature control (A).
Due to system variations and seasonal temperature uctuations
DHW ow rates/temperature rise will vary, requiring adjustment
at the draw off tap : the lower the rate the higher the temperature,
and vice versa.
Approximate temperatures for domestic hot water:
Knob Setting Hot Water Temperature (approx.)
Minimum 40ºC
Maximum 65ºC
Central Heating
The boiler controls the central heating radiator temperature to a
maximum of 80
o
C and a minimum of 30ºC, adjustable via the CH
temperature control (B).
The boiler is a high efciency combination boiler which is most
efcient when operating in condensing mode.
The boiler will operate in this mode if the CH temperature control
(C) is set to the ‘e’ position (economy mode). This control should
be set to maximum for very cold periods.
1.9 TO SHUT DOWN THE BOILER
Set the mode knob control to “off”.
1.10 WINTERISATION
If the holiday home or park home is to be left unoccupied during
cold periods when there is a threat of freezing, the domestic hot
and cold water circuits must be drained as follows:
- Turn off the cold water supply
- Open all hot and cold water taps
- Open all drain plugs in the hot and cold water system (do not
drain the central heating circuit, which should have been lled
with antifreeze if installed in a caravan holiday home or park
home).
For more detailed information on winterisation please refer to:
• The winterisation fact sheet under troubleshooting at www.
morcoproducts.co.uk
• The holiday home owners handbook
Please note there are no drain plugs on the boiler. Leave all taps
and drain plugs open until next use to allow any residual water to
continue to drain.
When installed in a Caravan Holiday Home or Park Home the
heating circuit and radiators should be lled with an approved
antifreeze (see section 4.8). The level of antifreeze should
be checked annually by a competent person. If the home is
occupied during very cold and freezing weather, the central
heating should be run continuously and the room stat or
thermostatic radiator valves set at a minimum of 15ºC.
If the home is unoccupied for even a short period, the hot and
cold water system must be drained down. This is the only way to
guarantee against frost damage.
ALL FROST DAMAGE IS OUTSIDE OF THE WARRANTY.
1.11 BOILER OVERHEAT PROTECTION
The boiler controls will shut down the boiler in the event of
overheating. Should this occur, a fault code L1 will be displayed.
Refer to fault chart.
1.12 FLAME FAILURE
Should this occur a fault code F2 / L2 will be displayed. Refer to
fault chart.
continued . . . . . .
8 8
restart
min
max
min
max
mode
off
e
restart
IV
A
K
J BFD GE CH
1.13 BOILER CONTROLS
Legend
A. Domestic Hot Water Temperature Knob
B. Central Heating Temperature Knob
C. Mode Knob
D. Boiler Status Display
E. Function Button
F. Burner ‘on’ Indicator
G. Restart button
H. Central Heating Economy Setting
J. Pressure Gauge
K. Timer