25
6.6.3 Fan speed at full load HTG (
^
)
Adjustable from 20% to 100% output (= 1200 to 5300 rpm), factory default
48
(100%). This value sets the maximum output of the boiler.
6.6.4 Fan speed at part load (HTG and DHW -
&
)
Adjustable from 20% to 100% output (= 1200 to 5300 rpm), factory default
12
(20%
output). This value sets the minimum output of the boiler.
6.6.5 Starting point modulation (
*
)
Adjustable from 5 to 30°C, factory default 25°C.
This value sets the flow/return
Δ
T point at which the control modulation begins. If the
Δ
t continues to rise, at 40°C the boiler will be at minimum output (parameter
&
), at
30°C the boiler will shut off (
code
b#)
,
see Par. 6.4
).
The factory default should be correct for most installations. Changing this value should
only be carried out on advice from the service engineer.
NOTE:
Installations with low flow problems would benefit by reducing this set point to
force modulation to begin sooner and minimise boiler off time.
6.6.6 Interface selection (
(
)
Adjustable
00
or
01
, factory default
01
This value sets the control option.
01 for standard 0 -10 Volt external control and
rematic
®
series of compensators (if fitted).
00
for the Honeywell Chronotherm option.
6.6.7 DHW cut-in temperature (
B
)
Adjustable from
01
to
20
°C (8 steps,
see Table 09
), factory default 5°C (
05
).
DHW demand:
With sensor:
- The DHW demand is satisfied when the DHW temperature equals the DHW set
point temp (parameter
#
) + 5°C.
- The DHW cut-in temperature sets the
Δ
t below this end point for DHW demand.
Cut-in temperature = DHW set point (55) + 5 - parameter
B
(5)
i.e. 55 + 5 - 5 = 55°C.
With thermostat or
rematic
®
control: the thermostat or
rematic
®
control determines the
DHW demand.
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