Laars Pennant PNCP, Installation And Operation Instructions Manual

LAARS Heating Systems

Page 16

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 main electrical disconnect switch.

2.

Close all manual gas valves.

3.

If freezing is anticipated, drain the Pennant and
be sure to also protect building piping from
freezing.
This step to be performed by a qualified
service person.

6.5 Spring and Fall Operation

Stand-by Service

Turn the thermostat down to approximately 70°F

(21°C). This will prevent the pool and surrounding
ground from becoming chilled and permit the pool to
be raised to swimming temperature in a shorter length
of time. Do Not Operate below 60°F (16°C).

6.6 Winter Operation

Complete Shutdown

1.

See Section 6.4

2.

If the heater is not protected from freezing
temperatures, it should be completely drained
before the first frost. Drain the heater by
removing the plug at the end of the inlet/outlet
header casting. Also, remove the small plug at
the bottom of the pump housing. Do not replace
either plug until the time that refilling is desired.
The heater must be level for complete draining.
When compressed air is used to blow out lines, it
is still necessary to follow these directions.
Because of the potential for electrical power
failure or pump failure, freeze protection should
never be accomplished by operating the pool
heater and the filter pump. Either of those
failures will potentially allow a freeze up and
cause damage to the heater and the attached
system.

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

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

CO2 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.