Pentair MT warranty Operation, 3A. Initial Start-Up, 3A-1. Initial Filter Cycle on a New Pool

MegaTherm Commercial Pool Heating Boiler Page 9

pool. If this condition exists, follow this procedure to adjust the switch:

1.With the boiler on, the filter pump running and the filter clean, slowly increase the pressure setting until the boiler shuts off. Slowly decrease the pressure setting until the boiler comes back on. Decrease the pressure setting another 2 psi to complete the switch setting.

2.Test the setting by closing the manual gas valve and turning off the filter pump. Turn the thermostat to the high setting and slowly open the manual gas valve. The boiler should not try to fire when the filter pump is off.

If the boiler is installed more than three feet above the pool level, install an eyeball fitting on the end of the return line to the pool to create adequate back pressure that the boiler to operate the pressure flow safety switch. Never reduce the factory setting of the pressure switch. For special installation problems, consult the factory.

SECTION 3.

Operation

3A. Initial Start-Up

3A-1. Initial Filter Cycle on a New Pool

On a newly constructed pool, be sure to run the filter pump long enough to completely "turn-over" the pool water before turning on the boiler. This will insure that any dirt and residue from the construction will be removed. The filter may clog rapidly during this period, causing the boiler to severely cycle if it is on.

3A-2. Starting Instructions

1.Check the following installation details before proceeding:

a.Has the required air supply been provided?

b.Is the boiler properly vented?

2.Be sure the filter is clean.

3.Start the filter pump.

Before placing the boiler in operation, the automatic safety shutoff devices must be checked. Once the unit is connected to the gas piping and after all of the requirements in Section 2 have been met, follow this procedure:

a.Before beginning the tests, make sure the main manual gas valve, and any other firing valves are in the OFF position.

b.Make sure the power switch on the boiler is in the “ON” position. After placing the

manual pilot valves in the open position, and resetting all safety devices (high limit, pressure switch, Low-Water-Cutoff, etc.), pilots can be lit following the procedure located on the boiler rating plate.

c.Once the pilots are lit and have been established for five minutes, the flame failure response time should be checked as follows:

System 16: (Electronically supervised standing pilot system standard on propane gas). Extinguish the pilot flame by placing the manual pilot valve in the closed position, and, at the same time, begin recording the time it takes for the output signal from the electronic ignition control to be interrupted. Refer to the electrical drawing supplied with the boiler for wiring details. The signal interruption can be detected either with a test light or a voltmeter. Because the ignition controls are in series, the control just upstream of the gas valves should be tested first. Under no circumstances should the response time exceed 5 seconds.

System 18: (Intermittent ignition supplied only for natural gas). With this system, pilots are automatically lit when the thermostat calls for heat. The pilots are permitted a trial period for ignition, then the system is locked out if it fails to light. To retry ignition, power to the boiler must be momentarily interrupted. After the pilot is initially lit, the trial for ignition time should be checked by turning off pilot gas, and, at the same time, monitoring the time it takes for the audible sparking at the pilot burner to stop. Under no circumstances should the trial for ignition exceed 15 seconds because electronic ignition controls are in series. The control just upstream of the gas valves should be tested first (refer to the electrical drawing supplied with the unit).

Once the trial for ignition period has been checked, the controls should be reset and the flame failure response time checked by following the procedure given for system 16.

4.With the pilots lit, initial activation of the main burners can be achieved by slowly opening the main manual valve. The result should be a smooth lighting of the main burners.