AHRI APEX, Installation, Operating And Service Instructions

Page: 86 / 124

86
X. Operation
G. Changing Adjustable 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.
2. Adjusting Parameters (continued)
“Press”
Modulation
Setup
button to access the following parameters:
Factory
Setting
Range /
Choices
Parameter and Description
See Table
28
See Table 28
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 the minimum and maximum modulation settings. This
parameter is intended to allow a user to set the parameters in a spare part Sage2.1 Controller to a
particular boiler type.
See Table
28
Minimum to
Maximum
Modulation
Central Heat Maximum Modulation
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 Modulation (fan speed) setting to limit the boiler output
accordingly.
See Table
28
Minimum to
Maximum
Modulation
Domestic Hot Water (DHW) Max Modulation
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 Modulation (fan speed) setting to limit the boiler output
accordingly.
See Table
28
Minimum
- 100 to
Maximum
Minimum Modulation
This parameter is the lowest modulation rate the Control will go to during any call for heat.
See Table
28
See Table 28
Lightoff Rate
This is the blower speed during ignition and flame stabilization periods. Non-adjustable on
models APX625 and APX725.
Sage2.1 Control Repair Part 104472-01 104472-04 105008-02 105008-01 105008-02 105008-01 104472-04
Altitude 0 - 4500 ft. 0 - 2000 ft. 0 - 4500 ft.
Boiler Type
425
-07
525
-07
625N
-02
625P
-02
725N
-02
725P
-02
825N
-05
825P
-05
Maximum Light-off Rate (RPM) 4000 4000 2500 4000 2500 4000 4000 4000
Maximum Modulation Rate
(RPM)
7600 5900 5050 4800 4350 4400 5200 5150
Minimum Modulation Rate
(RPM)
2100 1400 1600 1600 1400 1450 1200 1200
Absolute Maximum Modulation
Rate (RPM)
8500 6550 5900 6300 5500 5850 5900 5600
Table 28: Parameters Changed Using the Boiler Type Parameter Selections:
NOTE: Maximum Modulation Rates are designed for 100% nameplate rate at 0°F (-18°C) combustion air. Contact factory before
attempting to increase the Maximum Modulation Rate.