Remeha Quinta 30
26
Boiler modulation during continuing DHW demand
Sensor, thermostat and
rematic
®
control:
- The boiler will modulate when the flow temp equals the DHW set point + DHW con-
trol stop set point (parameter
I
) i.e. 55+20 = 75.
- The boiler carries out a control stop at a flow temp of 80°C (modulation point +
5°C), the display initally shows
980
, reducing to
975
.
- The DHW cut-in temperature sets the
Δ
t below this control stop.
Cut-in temperature = DHW set point (55) + DHW control stop set point (parameter
I
)
+ 5 - parameter
B
(5)
i.e. 55 +20 + 5 - 5 = 75
6.6.8 Fan Speed at DHW full load (
C
)
Adjustable from 20% to 100% output (= 1200 to 5300 rpm), factory default
53
(100%).
This value sets the maximum output of the boiler.
Parameters
D
-
E
- and
F
are factory set and must not be changed
6.6.9 Forced part load time after start (HTG only -
G
)
Adjustable from
00
-
15
min., factory default
03
(3 minutes).
This value sets the period of time the boiler will stay on part load at start up during
which time the flow temp is limited by part load temp set point (parameter
$
)
Changing the factory default should only be carried out on advice from the service
engineer.
NOTE:
When using an external analog (0 -10V) or 2 wire modulation input, the factory
default
03
should be changed to
00
.
Parameter
H
factory set must not be changed
6.6.10 DHW control stop set point (
I
)
Adjustable from
00
-
30
°C factory default 20°C.
Refer to Par. 6.6.7.
6.6.11 DHW control option (
J
)
Three options
00
-
01
-
02
factory default
00
.
This value sets the DHW control option.
00
Three way diverting valve (port A - HTG and Port B - DHW)
01
DHW pump
02
Inverted three way diverting valve (port B - HTG and Port A - DHW)
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57117.indd 26
1-4-2009 14:35:51
1-4-2009 14:35:51
