Control Of Water Temperature; Weather Compensation; Boiler Overheat Protection; Boiler Controls - IDEAL LOGIC Combi 24 Installation And Servicing

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
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.
1

BOILER COnTROLS

Legend
a. Pre-heat On/Off
B. DHW Temperature Control
C. CH Temperature Control
D. Mode Control
E. Boiler Status
F. Burner 'on' Indicator
g. Pressure Gauge
h. Condensate Drain
J. Economy Mode
Ideal Logic Combi -
).
Flow Temperature
o o
40 C (104 F)
o o
64 C (147 F)
A
User's
Central heating
The boiler controls the central heating radiator temperature to a
maximum of 80
)
The Logic Combi 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.

Weather Compensation

When the Weather Compensation option is fitted to the system
then the CH Temperature Control (C) becomes a method of
controlling room temperature. Turn the knob clockwise to
increase room temperature and anti-clockwise to decrease room
temperature. Once the desired setting has been achieved, leave
the knob in this position and the system will automatically achieve
the desired room temperature for all outside weather conditions.
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.
B E
G
o
C, adjustable via the CH temperature control (C).
will be displayed. Refer to fault
F C J
H
will be displayed.
continued . . . . . .
D
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