Weil-McLain ULTRA Ultra-105, Service Manual

Page: 47 / 60

47
Part number 550-100-029/0810
GAS
-
FIRED WATER BOILER SERIES
1 & 2
—
Control supplement & Service guide
Parameter explanations
(continued)
Maximum fan speed
1. Parameters 13 and 15 can be set to limit the
maximum boiler firing rate. Boiler firing rate is
proportional to the fan speed, so reducing the
maximum fan speed reduces maximum input.
2. Reducing maximum fan speed will be helpful for
systems on which the boiler is oversized for either
space heating or DHW, or both.
3. The maximum fan speed can be set separately
for space heating and DHW using parameters 13
and 15.
Parameter 13 — Space heating max fan
speed
1. Acceptable range:
Ultra-80 to 230: 1300 to 5200 rpm (13 to 52 on
s
boiler display).
Ultra-310: 1400 to 5800 rpm (14 to 58 on boiler
s
display).
Boiler display shows fan speed in 100’s of rpm.
s
A value of 48 would mean a speed of 100 x 48,
or 4800 rpm.
2. Factory default — see Figure 26, page 43.
3. If the boiler is oversized for space heating, you can
reduce the maximum fan speed during space heat-
ing operation, parameter 13, to limit the maximum
boiler input.
Parameter 15 — DHW max fan speed
1. Acceptable range:
Ultra-80 to 230: 1300 to 5200 rpm (13 to 52 on
s
boiler display).
Ultra-310: 1400 to 5800 rpm (14 to 58 on boiler
s
display).
Boiler display shows fan speed in 100’s of rpm.
s
A value of 48 would mean a speed of 100 x 48,
or 4800 rpm.
2. Factory default — see Figure 26, page 43.
3. If the boiler is oversized for domestic water heating,
you can reduce the maximum fan speed during
DHW operation, parameter 15, to limit the maxi-
mum boiler input.
The fan speed MUST NOT BE SET
!"/6% the value listed in Fig-
ure 30, page 48. This would increase
boiler firing rate beyond the accept-
able limit, resulting in potential
for severe personal injury, death or
substantial property damage.
The fan speed MUST NOT BE SET
"%,/7 the value listed in Fig-
ure 30, page 48. This could result in
potential for severe personal injury,
death or substantial property dam-
age.
()'( !,4)45$% INSTALLATIONS
ABOVE FEET
— The -).)
-
-5- fan speed (parameter 17) and
)'.)4)/. fan speed (parameter 19)
must be set to the values listed in
Figure 31, page 49. Failure to comply
could result in severe personal injury,
death or substantial property dam-
age.
Minimum fan speed —
parameter 17
1. 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).
2. Parameter 17 sets the minimum fan speed for both
DHW and space heating modes.
See Figure 25, page 42 for procedure to access Parameter settings.