Laars Pennant PNCP 500, Инструкция по установке и эксплуатации

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LAARS Heating Systems
Page 16
Pennant appliances for high altitude. High altitude
adjustment is accomplished by adjustment of the gas
valve manifold pressure and the air shutter(s). The
required instruments used to assist in these
adjustments are a CO
2
or O
2
Analyzer and a U-Tube
Manometer or other device capable of reading a
pressure of 2.5-3.0 inches W.C. (0.62-0.75 kPa).
Start the adjustment process by checking the CO
2
in the “as installed” condition. Adjust the air shutter(s)
so that the CO
2
is about 8% or the O
2
is about 6.8% for
appliances operating on Natural Gas. For appliances
operating on LP Gas adjust the air shutter(s) so that
the CO
2
is about 9.2% or the O
2
is about 6.8%.
Appliances with two blowers should be adjusted so
that the air shutters below each blower are open the
same amount.
Once the CO
2
or O
2
has been set, the manifold
pressure may be adjusted. Remove the 1/8 NPT plug
from the lower side of the gas valve that is to be set
and install a fitting, hose and manometer. Start the
appliance and observe the manifold pressure. Manifold
pressure must be adjusted to 3.0 in. W.C. (0.75 kPa)
(for high altitude only, standard operating pressure is
2.5 in. W.C. (0.62 kPa)). It is adjusted by removing the
slotted cap on the gas valve and turning the adjustment
screw (beneath the cap) clockwise to increase pressure
. After the adjustments have been completed, the
fitting, hose and manometer have been removed and
the 1/8" plug has been replaced, replace the cap.
Repeat this process until all gas valves have been set.
Note: The pressure can be set only when the appliance
is operating and only when the particular gas valve
being adjusted is energized by a call for heat.
After all of the gas valve manifold pressures
have been set, the CO
2
or O
2
must be reset. CO
2
or O
2
will have changed when the manifold pressure was
adjusted. Open the air shutter(s) to reduce the CO
2
or
O
2
to the values achieved previously.
The procedure is complete when all gas valves
are adjusted to a manifold pressure of 3.0 in. W.C.
(0.75 kPa) and the CO
2
is adjusted to 8.0% for Natural
Gas appliances or 9.2% for LP appliances. When
using an O
2
analyzer, the correct O
2
is 6.8% for both
Natural Gas and LP appliances.
Caution
Should any odor of gas be detected, or if the gas
burner does not appear to be functioning in a
normal manner, close main shutoff valve, do not
shut off switch, and contact your heating contractor,
gas company, or factory representative.
6.4 Shutting Down the Pennant
1. Switch off the shutdown switch (located above
the Main Power Switch).
2. Wait until the “pump” light (located on the front
panel) goes out.
warm-up is complete and all safety devices are
verified, the gas valves open. If ignition doesn’t
occur, check that there is proper gas supply. Wait
5 minutes and start the unit again. During initial
start up, air in the gas line may cause the Pennant
to "lock out" during the first few trials for
ignition. Depending on the ignition modules
installed, the manual reset button on the ignition
module(s) may need to be depressed to restart the
heater.
6. When the unit is running, the supply gas pressure
must be checked. Inlet gas pressure must not
exceed 13" W.C. (3.2kPa). The minimum inlet
gas pressure is 5" W.C. (1.2kPa).
7. Once the inlet gas pressure is verified, the outlet
gas pressure from each valve (manifold gas
pressure) must be checked, and adjusted, if
necessary. The manifold gas pressure must be
2.5" W.C. (0.62kPa).
8. Complete the setup by checking the CO
2
at the
outlet of the unit. The CO
2
should be 8% for
natural gas, or 9.2% for propane.
9. After placing the appliance in operation, the
Burner Safety Shutoff Device must be tested
.
To test:
(a)
Close gas shutoff valve with burner
operating.
(b) The flame will go out and blower will
continue to run for the post purge cycle.
Three (3) additional attempts to light will
follow (only one (1) attempt for optional
module). Ignition will not occur as the gas
is off. The ignition control will lockout, and
will have to be reset before the unit will
operate. The ignition control reset button is
located on each ignition control, in the
lower right corner, and can be reset by
depressing. It is not marked on the ignition
control label.
(c) Open gas shutoff valve. Restart the
appliance. The ignition sequence will start
again and the burner will start. The
appliance will return to its previous mode
of operation.
NOTE: Models 1250, 1500, 1750 and 2000 have two
ignition controls and two ignitors.
6.3.2 High Altitude Adjustment and Set Up
Pennant appliances may be operated at high altitude
(7700 ft., 2347 m) with a reduction in output of
approximately 10%. At elevations higher than 7700 ft.
(2347 m) the reduction in output will exceed 10% and at
elevations below 7700 ft. (2347 m) it will be less than
10%. When adjusted properly, the appliance will perform
properly at any altitude. High altitude adjustment must
not be made on appliances operating at elevations below
2500 ft. (762 m).
No orifice changes are required to adjust the