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operation
Winter conditions - i.e. Ch and DhW required.
Ensure the mode knob control (D) is set to winter (
The boiler will fire and supply heat to the radiators but will give
priority to DHW on demand.
The DHW preheat will operate as described under 'Summer
conditions' during periods when there is no call for CH.
summer conditions - i.e. DhW only required.
Set the mode knob control to Summer (
Set the CH external controls to OFF.
Preheat will operate with the preheat switch (A) set to ON.
The boiler will fire periodically for a few seconds to maintain the
DHW calorifier in a preheated condition. The average time period
between firing is 90 minutes. This may vary considerably due to
the surrounding ambient temperature of the boiler. The boiler will
fire whenever there is a demand for DHW.
The boiler preheat facility can be immobilised by turning the
preheat switch (A) to OFF. This will stop the boiler operating
for short periods. This facility is primarily provided for boiler
installations in a sensitive area (i.e. bedroom etc.)
note. The pump will operate briefly 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
64
C maximum at low draw-off rate, adjustable via the DHW
o
temperature control (B).
Approx. flow temperatures for the boiler thermostat settings are:
Knob setting
Minimum
Maximum
1
BoiLEr ConTroLs
Legend
a. Pre-heat On/Off
B. DHW Temperature Control
C. CH Temperature Control
i-mini -
User's
).
Flow Temperature
o
o
40
C (104
F)
o
o
64
C (147
F)
D. Mode Control
E. Boiler Status
F. Burner 'on' Indicator
A
B
G
Due to system variations and seasonal temperature fluctuations
DHW flow rates/temperature rise will vary, requiring adjustment
at the draw off tap : the lower the rate the higher the temperature,
)
and vice versa.
Central heating
The boiler controls the central heating radiator temperature to a
maximum of 80
The i-mini is a high efficiency combination boiler which is most
efficient 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
To shut down the boiler
Set the mode knob control to OFF
To relight the boiler
Repeat the procedure detailed in 'To light the boiler'.
Frost protection
If no system frost protection is provided and frost is likely during
a short absence from home, leave the heating controls (if fitted)
at a reduced temperature setting. For longer periods, the entire
system should be drained.
If the system includes a frost thermostat then, during cold
weather, the boiler should be turned OFF at the time switch (if
fitted) ONLY. The mains supply should be left switched ON, with
the boiler thermostat left in the normal running position.
Boiler overheat Protection
The boiler controls will shut down the boiler in the event of
overheating. Should this occur, a fault code
Refer to fault chart.
Flame Failure
Should this occur a fault code
chart.
g. Pressure Gauge
h. Condensate Drain
J. Economy Mode
E
F
C
J
H
o
C, adjustable via the CH temperature control (C).
will be displayed. Refer to fault
D
will be displayed.
continued . . . . . .
3
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