AHRI K2WT, Installation, Operating And Service Instructions

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XII. Operation
F. Changing Adjustable Parameters (continued)
2. Adjusting Parameters (continued)
Warning
Asphyxiation Hazard. Boiler type is factory set and must match the boiler model. Only change the boiler
type setting if you are installing a new or replacement Control. The boiler type setting determines minimum
and maximum blower speeds. Incorrect boiler type can cause hazardous burner conditions and improper
operation that may result in PROPERTY LOSS, PHYSICAL INJURY OR DEATH.
“Press” button to access the following parameters:
Factory
Setting
Range /
Choices
Parameter and Description
SeeTable
12.10
See Table
12.10
Boiler Type
Boiler Size Setup
To verify the boiler size selection, a qualified technician should do the following:
1. Check boiler’s label for actual boiler size.
2. Set “Boiler Type” to match actual boiler size.
3. Select “Confirm”.
The Boiler Type parameter changes multiple, minimum and maximum modulation settings. This
parameter is intended to allow a user to set the parameters in a spare part Control to a particular
boiler type. When changing the “Boiler Type” be sure to select “ENTER” and “NEXT” until all
parameters are entered as shown by the “complete” indication.
100%
Minimum to
Maximum
Heat Rate
Central Heat Maximum Expected Heat rate
This parameter defines the highest modulation rate the Control will go to during a central heat call
for heat. If the rated input of the installed home radiation is less than the maximum output of the
boiler, change the Central Heat Maximum Expected Heat Rate (fan speed) setting to limit the boiler
output accordingly.
100%
Minimum to
Maximum
Heat Rate
Domestic Hot Water (DHW) Max Expected Heat Rate
This parameter defines the highest modulation rate the Control will go to during a Domestic Hot
Water call for heat. If the rated input of the indirect water heater is less than the maximum output
of the boiler, change the DHW Maximum Expected Heat Rate (fan speed) setting to limit the boiler
output accordingly.
100%
Minimum to
Maximum
Heat Rate
auxiliary Maximum Expected Heat rate
This parameter defines the highest modulation rate the Control will go to during the auxiliary heat
call for heat. If the rated input of the Auxiliary Heat Zones is less than the maximum output of the
boiler, change the Auxiliary Heat Maximum Expected Heat Rate (fan speed) setting to limit the boiler
output accordingly.
40%
100 RPM to
Maximum
Heat Rate
Zone 1 Expected Heat Rate (typical for zone 1 through 16)
This parameter defines the highest modulation rate the Control will go to during the Zone 1 call for
heat. If the rated input of the installed home radiation in zone 1 is less than the maximum output
of the boiler, change the Zone 1 Expected Heat Rate (fan speed) setting to limit the boiler output
accordingly.
15
Minutes
0 to 60
Minutes
Zone Release Time
After the Zone Release Time minutes and a zone has not been satisfied (thermostat opens) the
measured heat loss will be released to increase to the Central Heat Maximum Heat Rate.
See Table
12.10
Minimum
to Maximum
Minimum Modulation
This parameter is the lowest modulation rate the Control will go to during any call for heat.
4000 RPM
3500 - 4000
RPM
Lightoff rate
This is the blower speed during ignition and flame stabilization periods.