Commercial Pool Heaters
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.
Figure 55 – Combustion AirAdjustment with a Manometer to Set Differential Pressures
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
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.
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.
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.
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