Utica Boilers UB95M-200 Verweisanleitung
8
greater than the value of Parameter 4 (t1 top). there
is no concern that temperature boost would supply
water too hot for low-temperature systems, such as
slab-type radiant heating. On hybrid systems, with
is no concern that temperature boost would supply
water too hot for low-temperature systems, such as
slab-type radiant heating. On hybrid systems, with
finned tube radiation and radiant slab, provide additional
low temperature protection for the radiant portion of the
system, because Parameter 4 (t1 top) is likely to be
set higher than on a radiant-only system.
low temperature protection for the radiant portion of the
system, because Parameter 4 (t1 top) is likely to be
set higher than on a radiant-only system.
IMPORTANT: Many slab-type radiant systems
won’t require boost. This function can be dis-
abled with a parameter 11 setting of “0.”
abled with a parameter 11 setting of “0.”
Boost operation
in outdoor reset operation (outdoor sensor connected),
1.
the boiler control automatically increases the target out-
let water temperature if a call for heat exceeds a time
equal to Parameter 11 (factory default of 30 minutes).
at each interval of Parameter 11 of a continuous call for
let water temperature if a call for heat exceeds a time
equal to Parameter 11 (factory default of 30 minutes).
at each interval of Parameter 11 of a continuous call for
2.
heat, the control module increases the target tempera-
ture by 18° F. See
ture by 18° F. See
Figure #3.
the control module will continue increasing target
3.
temperature until it reaches the value set in Parameter
4 (t1 top).
When the call for heat ends while target temperature is
4 (t1 top).
When the call for heat ends while target temperature is
4.
“boosted,” the target temperature drops about 2° F for
III - PARAMETER ExPLANATIONS
PARAMETER 11 (automatic supply temperature booster operation)
Temperature Boost Operation (typical): in this example, the boiler is operating in outdoor reset mode with a calculated setpoint tem-
perature of 130°F. the call for heat has lasted more than 10 minutes (value of Parameter 11) and supply temperature boost has occured.
Figure #3
each minute the thermostat is open.
Range: 1-30 minutes.
Range: 1-30 minutes.
5.
Factory default: 30 minutes.
6.
deactivate automatic temperature boost by setting to
7.
“0.”
MAxIMUM FAN SPEED
Fan speed must be set within the limits sup-
plied by the factory (See the “Default Param-
eters table” in Section II). Setting limits above
or below these factory defaults would increase
eters table” in Section II). Setting limits above
or below these factory defaults would increase
or decrease boiler firing rate beyond the ac-
ceptable limit, resulting in potential for severe
personal injury, death, or substantial property
damage.
personal injury, death, or substantial property
damage.
WARNING
!
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 reduc-
es maximum input.
fan speed, so reducing the maximum fan speed reduc-
es maximum input.
Reducing maximum fan speed will be helpful for sys-
•
tems on which the boiler is oversized for either space
heating or dHW, or both.
heating or dHW, or both.
maximum fan speed can be set separately for space
•