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heating and dHW using Parameters 13 and 15.
parameter 13 (space heating max. fan speed):
•
acceptable Range for natural gas and LP: 2250 to
6000 rpm (22 to 60 on boiler display).
nOte: Boiler display shows fan speed in hundreds of rpm. a
value of 48 would mean a speed of 100 x 48, or 4800 rpm.
•
Factory defaults: See the "default Parameters table" in
Section ii of this manual.
•
if the boiler is oversized for space heating, you can
reduce the maximum fan speed during space heating
operation (Parameter 13) to limit the maximum boiler
input.
parameter 15: DHW max fan speed
•
acceptable Range for natural gas and LP: 2250 to
6000 rpm (22 to 60 on boiler display).
nOte: Boiler display shows fan speed in hundreds of rpm. a
value of 48 would mean a speed of 100 x 48, or 4800 rpm.
•
Factory defaults: See the "default Parameters table" in
Section ii of this manual.
•
if the boiler is oversized for domestic water heating, you
can reduce the maximum fan speed during dHW opera-
tion (Parameter 15) to limit the maximum boiler input.
MINIMUM FAN SpEED (pARAMETER 17)
!
The fan speed must not be set below the value
as supplied from the factory (see the "Default
Parameters table" in Section II). This would
reduce boiler firing rate below the acceptable
limit, resulting in potential for severe personal
injury, death, or substantial property damage.
PARAMETER 17 sets the minimum fan speed. Boiler firing
rate is proportional to fan speed, so increasing the minimum
fan speed increases the minimum firing rate (low fire).
Parameter 17 sets the minimum fan speed for both dHW
and space heating modes. set parameter 17 to 3,200 for
altitudes above 2,000 ft.
•
acceptable Range for natural gas and LP: 2250 rpm
(22 on boiler display).
nOte: Boiler display shows fan speed in hundreds of rpm. a
value of 48 would mean a speed of 100 x 48, or 4800 rpm.
•
Factory defaults: See the "default Parameters table" in
Section ii of this manual.
III - pARAMETER EXpLANATIONS
WARNING
BOILER FIRING RATE VS. RpM
% Rate
BTUH
40
80,000
50
100,000
60
120,000
70
140,000
80
160,000
90
180,000
100
200,000
NOTE: Results may vary depending on altitude of in-
stallation, gas calorific value, and vent length.
IGNITION FAN SpEED (pARAMETER 19)
The fan speed must not be set BELOW the value
as supplied from the factory (see the "Default
Parameters Table" in Section II). This would
reduce boiler firing rate below the acceptable
limit, resulting in potential for severe personal
injury, death, or substantial property damage.
•
Parameter 19 sets the fan speed during ignition. Boiler
firing rate is proportional to fan speed, so increasing the
minimum fan speed increases the minimum firing rate
(low fire).
IMPORTANT:
Parameter 19 should only be changed where
required for high altitude applications.
•
acceptable Range for natural gas and LP: 3000 to
3600 rpm (30 to 36 on boiler display).
nOte: Boiler display shows fan speed in hundreds of rpm. a
value of 48 would mean a speed of 100 x 48, or 4800 rpm.
•
Factory defaults: See the "default Parameters table" in
Section ii of this manual.
DIFFERENTIAL (HySTERESIS) SETTINGS
Do not change the differentials (hysteresis) for
domestic hot water operation (Parameters 24,
25, 26, and 27). Always use only the factory de-
fault settings for these parameters.
9
RPM
Boiler Display
2250
3250
3800
4400
4750
5250
6000
WARNING
!
WARNING
!
22
32
38
44
47
52
60
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