Install Instructions

Page 49
NEOTHERM Residential Boilers
HIGH EFFICIENCY RESIDENTIAL BOILERS
®
9.B First Operation
CAUTION
The initial setup must be checked before the unit is
put in operation. Problems such as failure to start,
rough ignition, strong exhaust odors, etc. can be due
to improper setup. Damage to the boiler resulting from
improper setup is not covered by the limited warranty.
REQUIRED TOOLS: Di󰀨erential pressure gauge
capable of reading negative 0.01 inches W.C.
(0.002kPa), screw drivers, Torx bits, combustion
analyzer.
1. Using this manual, make sure the installation is
complete and in full compliance with the instructions
and all local codes.
2. Determine that the unit and system are lled with
water and all air has been bled from both. Open all
valves. If the unit has optional pressure gas resets
then the low pressure gas switch will need to be reset
by pushing the button.
3. Observe all warnings on the Operating Instructions
label and turn on the gas and main electrical power
(circuit breaker) to the unit.
4. Turn the Unit on at the On/O󰀨 switch.
5. The Unit will begin the start sequence. The blower
and pump will energize for the pre-purge period,
then the ignition sequence will start. After all safety
devices have been veried, the gas valve will open.
If ignition doesn’t occur, turn o󰀨 the Unit, and check
that there is proper gas supply. Wait 5 minutes before
restarting.
6. After placing the unit into operation, the Burner
Safety Shuto󰀨 Device must be tested:
• Close the gas shuto󰀨 valve with the burner operating.
• The ame will go out and the blower will continue
to run for the post purge cycle. One or three
additional attempts to light will follow. Each cycle
will include pre-purge, ignitor on, valve/ame on,
and post purge. Ignition will not occur because the
gas is o󰀨. The ignition control will lockout after a
single try or a third try depending on the controller
model.
• Open the gas shuto󰀨 valve. Reset the boiler
control by pressing the Reset button on the
control or on the display. Restart the unit. The
ignition sequence will start again and the burner
will start. The unit will return to its previous mode
of operation.
WARNING
If you detect any odor of gas, or if the gas burner
does not appear to be functioning in a normal manner,
CLOSE THE MAIN SHUTOFF VALVE. Do not shut o󰀨
the switch. Contact your heating contractor, gas com-
pany, or factory representative.
9.C Restarting the Unit
If the unit has been drained, see Section 9.1 in this
manual for instructions on lling and purging the unit
properly.
1. Turn o󰀨 the main electrical disconnect switch.
2. Close all manual gas valves.
3. WAIT FIVE (5) MINUTES.
4. Set the aquastat or thermostat to its lowest setting.
5. Open all manual gas valves.
6. Reset all safety switches (pressure switch, manual
reset high limit, etc.).
7. Set the temperature controller to the desired
temperature setting, and switch on electrical power.
8. The burner will go through a prepurge period,
followed by ignition.
9.D Shutting Down the Unit
1. Turn o󰀨 the main electrical disconnect switch.
2. Close all manual gas valves.
3. If you think the Unit might freeze, drain it. All water
must be removed from the heat exchanger, or
damage from freezing may occur. Also be sure to
protect the piping in the building from freezing.
WARNING
This step must be performed by
a qualied service technician.