92 103448-07- 1/16
IX. System Start-up (continued)
WARNING
Asphyxiation Hazard. Install ue temperature
sensor and sensor cap into two-pipe vent
connector port upon completion of combustion
test. Failure to properly secure the ue
temperature sensor into the port could lead to
property damage, personal injury or loss of life.
3. Reinstall ue temperature sensor with sensor cap
into two-pipe vent adapter.
a. Inspect ue temperature sensor cap for
degradation. Replace if needed.
b. Use Molykote 111 grease to lubricate outer
surface of two-pipe vent adapter stub where ue
temperature sensor is inserted. Also lubricate
tip of ue temperature sensor. Reinstall ue
temperature sensor with cap into two-pipe vent
adapter.
4. Return boiler to normal operating mode by
pressing “Auto”.
M. Checking / Adjusting Gas Input Rate
1. Turn off gas supply to all appliances other than
gas-red boiler.
2. Lock the boiler in high re, following Step 2a
in Paragraph L.
3. Clock gas meter for at least 2 revolutions of
the dial, typically labeled ½ or 1 cubic foot per
revolution on the gas meter.
4. Determine gas ow rate in cubic feet per hour
based on elapsed time for 2 revolutions.
Example:
Using a meter with dial labeled 1 cubic foot per
revolution, measured time is 72 seconds for 2
Revolutions, i.e. 36 seconds per 1 cubic foot.
Calculate hourly gas ow rate:
3600 sec/hr ÷ 36 sec/cu ft = 100 cu ft/hr
5. Obtain gas-heating value (BTU per cubic foot)
from gas supplier.
6. Multiply hourly gas ow rate by gas heating value
to determine the boiler input rate, BTU/hr
Example:
Natural gas heating value provided by local gas
utility is 1050 BTU per cubic foot.
Measured and calculated hourly gas ow rate is 100
cu ft/hr.
Measured boiler input rate is:
100 cu ft/hr * 1050 BTU/ cu ft = 105, 000 BTU/hr
7. Verify measured input rate is within 88% to
100% of the max. input listed on the boiler rating
label.
8. If measured input is too high, reduce maximum
modulation fan speed (either central heat or
domestic hot water, depending on source of call for
heat) in increments of 50 RPM and check the input
rate after each adjustment. Follow instructions in
Section X. “Operation” to adjust the maximum
modulation fan speed.
9. If measured input is too low, increase maximum
modulation fan speed (either central heat or
domestic hot water, depending on source of call for
heat) in increments of 50 RPM and check the input
rate after each adjustment. Follow instructions
in Section X “Operation” to adjust the maximum
modulation fan speed.
10. Return boiler to normal operating mode by
pressing “Auto”.
11. Return other gas-red appliances to previous
condition of use.
N. Test Safety Limits Controls
1. Test the ignition system safety shut-off by
disconnecting the ame sensor connector (black
plug with orange wire) from the ame ionization
electrode. See Figure 27. The boiler must shut
down and must not start with the ame sensor
disconnected.
2. Test any other external limits or other controls
in accordance with the manufacturer’s instructions.
O. Check Thermostat Operation
Verify that the boiler starts and stops in response to
calls for heat from the heating thermostat and indirect
water heater thermostat. Make sure that the appropriate
circulators also start and stop in response to the
thermostats.
P. Adjust Supply Water Temperature
As shipped, the heating set point supply temperature
is set to 180°F (82.2°C) and, indirect water heater set
point supply temperature is set to 170°F (76.7°C). If
necessary, adjust these to the appropriate settings for the
type of system to which this boiler is connected. See
Section X “Operation” (Parameter Table 29 on page
108) of this manual for information on how to adjust
supply setpoint.
Q. Adjust Thermostats
Adjust the heating and indirect water heater thermostats
to their nal set points.
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