Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS - Manual (Page 50)

Commercial Pool Heaters
50
CLEANING AND
MAINTENANCE
Continued
If the air pressure switch does not make within 60 seconds
from the time the fans turn ON, the ignition module will go
into a soft lockout period (approximately 5 minutes in
duration) during which time the fans are turned off and the
module shows the Low Air flash code. If necessary, soft
lockout can be circumvented by cycling power using the
ON/OFF switch to cycle power to the unit.
Note: If the pool heater has been firing recently, allow the
pool heater to cool for five minutes with the fans
running before beginning the adjustment procedure.
Retain the plastic caps removed from the tees for
reinstallation when complete.
Adjustment Procedure
1. Remove the upper front jacket panels from the unit to
access the upper chamber.
2. Slightly loosen screws that attach fan transition box to
metal base (see Figure 53).
3. Depending on model, the air shutter(s) may be located
either on the side or the rear of the fan duct. Locate the air
shutter at the side/rear of the fan duct (see Figure 52 and
54). Move the air shutter towards the rear or left side of the
unit to increase air pressure. Move the air shutter towards
the front or right side of the unit to decrease air pressure.
4a. The 500,000 - 750,000 Btu/hr models have one fan with a
side mounted air shutter. The differential for these models
is nominally 1.5 - 1.65 inches water column.
4b. On the 990,000 - 2,070,000 Btu/hr models adjust the air
shutter on the left fan until the differential pressure is
nominally 1.1 - 1.3 inches water column. Note: The air
chamber pressure is 1.2 inches water column for
liquefied petroleum (L.P.) and 1.4 inches water column
for natural.
5. Reattach the hoses to the pressure switch and locate the air
switch adjacent to the right fan and connect the tubes to
either side of your manometer.
6. Adjust the air shutter on the right fan until the differential
pressure is nominally 1.1-1.3 inches water column.
7. Once the adjustment procedure is complete, reattach the
caps to the tees in the hoses to the pressure switches and
check all tubing and wire connections for snug fit. Test fire
the unit. Install upper panels.
Figure 55 – Combustion Air Adjustment with a Manometer
to Set Differential Pressures
Servicing Hot Surface Igniter and Ignition
Module
This pool heater uses a proven hot surface ignition control
module and a hot surface igniter. The hot surface ignition
module is not repairable. Any modification or repairs will
invalidate the warranty.
ƽ
WARNING: Do not attempt to repair a faulty hot
surface igniter or ignition module. Any modification
or repairs may create hazardous conditions that
result in property damage, personal injury, fire,
explosion and/or toxic gases.
A faulty hot surface igniter or ignition module must be
replaced with an identical part. A specification igniter and
ignition control module for this specific pool heater is
available from your local distributor. Do not use general
purpose field replacement ignition modules or igniters.
Ignition System Checkout
1. Turn “OFF” the gas supply to the pool heater.
2. Turn the electric power “ON”.
3. Program the temperature control to settings above water
temperature or to the highest safe setting.
4. The igniter will cycle on trial for ignition.
5. The ignition module will lock out and turn the alarm light
on.
6. Program the temperature control to the desired temperature
set point.
7. Turn “ON” the gas supply.
8. Press the module reset button (located on the front of the
unit) to reset the module.
9. If ignition system fails to operate properly, repair work
must be performed by a qualified serviceperson or
installer.