LAARS Pennant PNCV - Install and Operating Manual - Manual (Page 28)

LAARS Heating Systems Page 28
SECTION 6.
Operating Instructions
6.1 Filling the Boiler System
1. Ensure the system is fully connected. Close all
bleeding devices and open make-up water valve.
Allow system to fill slowly.
2. If make-up water pump is employed, adjust
pressure switch on pumping system to provide
a minimum of 12 psi (81.8 kPa) at the highest
point in the heating loop.
3. If a water pressure regulator is provided on the
make-up water line, adjust the pressure regulator
to provide at least 12 psi (81.8 kPa) at the highest
point in the heating loop.
4. Open bleeding devices on all radiation units
at the high points in the piping throughout
the system, unless automatic air bleeders are
provided at such points.
5. Run system circulating pump for a minimum of
30 minutes with the boiler shut off.
6. Open all strainers in the circulating system,
check flow switch operation, and check for
debris. If debris is present, clean out to ensure
proper circulation.
7. Recheck all air bleeders as described in Step 4.
8. Check liquid level in expansion tank. With the
system full of water and under normal operating
pressure, the level of water in the expansion tank
should not exceed ¼ of the total, with the balance
filled with air.
9. Start up boiler according to the procedure in this
manual. Operate the entire system, including the
pump, boiler, and radiation units for one (1) hour.
10. Recheck the water level in the expansion tank. If
the water level exceeds ¼ of the volume of the
expansion tank, open the tank drain, and drain to
that level.
11. Shut down the entire system and vent all
radiation units and high points in the system
piping, as described in Step 4.
12. Close make-up water valve and check strainer in
pressure reducing valve for sediment or debris
from the make-up water line. Reopen make-up
water valve.
13. Check gauge for correct water pressure and also
check water level in the system. If the height
indicated above the boiler insures that water is at
the highest point in the circulating loop, then the
system is ready for operation.
14. Refer to local codes and the make-up water
valve manufacturer’s instructions as to whether
the make-up water valve should be left open or
closed.
15. After placing the unit in operation, the ignition
system safety shutoff device must be tested. First,
shut off the manual gas valve, and call the unit
for heat. After the pre-purge and ignitor heat-up
time, the main gas terminals will be energized,
attempting to light, for four (4) seconds, and then
will de-energize. The unit will go into lockout
mode. Second, turn the power off and then on
again, open the manual gas valve and allow the
unit to light. While the unit is operating, close the
manual gas valve and ensure that power to the
main gas valve has been cut.
16. Within three (3) days of start-up, recheck all air
bleeders and the expansion tank as described in
Steps 4 and 8 above.
Important: The installer is responsible for identifying
to the owner/operator the location of all emergency
shutoff devices.
WARNING
Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
that may have been under water.
AVERTISSEMENT
N’utilisez pas cet appareil si l’une de ses pièces est
passée sous l’eau. Appelez tout de suite un techni-
cien en entretien et en réparation pour inspection
de l’appareil et remplacement des pièces du sys-
tème de commande, et des pièces de commande
du circuit gaz, qui sont passées sous l’eau.
6.2 Sequence of Operation
The amber “Ready” light on the front panel
indicates that the control system is energized. Upon a
call for heat from the system temperature sensor, the
green “Heat” indicator on the front panel will light.
The green “Pump” indicator on the front panel will
light.
Once the water flow switch makes, and if all of
the safety interlocks are closed, the ignition module(s)
will energize the blower(s) for a 15-second pre-purge,
followed by a 20-second period to allow the ignitor(s)
to heat.
Energizing the blower pressurizes the air box
(which supplies air to the burners) and closes the
normally-open contact(s) of the airflow pressure
switch(es). This allows the ignition module to proceed
with the ignition sequence.
The blocked flue pressure switch senses the
pressure difference between the exhaust plenum and
the blower inlet plenum. It will interrupt the airflow
sensing circuit if this pressure exceeds a maximum
value. If airflow is not proven, the ignition module
will either attempt ignition again (up to three times) or
will lockout (if the optional lockout ignition module is
used).
The ignition module checks that the ignitor
current has reached a minimum value and energizes
the gas valves at the end of the ignitor-heating period.
The green indicators on the front panel will
light, indicating that the gas valves are open. After a
4-second trial for ignition, the ignitor switches off, and