3B. To Start Up System See a for Initial Start Up

Page 10	Pentair Water Commercial Pool and Spa

3A-3. Hi-Limit Checkout

After running the boiler for a long enough period to bring the water temperature within the range of the hi-limit, slowly back off the high limit setting until the unit shuts off. The main burners should re-ignite when the hi-limit is turned back up to its original setting.

The high limit should now be reset and the boiler run until it shuts off automatically on high limit.

Now that all tests of the safety shutoff devices have been completed, refer to Section 3B for the proper settings of temperature controls.

NOTE: Should any of the controls fail to function properly, consult the factory or your gas company representative.

3B. To Start Up System

(See Section 3A for Initial Start Up)

Start up boiler:

1.Be certain system pump is running.

2.Lighting instructions are provided on the rating plate and in the User’s Manual and are as follows:

a.Turn off main electrical switch.

b.Turn off all manual gas valves and wait five minutes.

c.Set aquastat or thermostat to lowest setting.

d.Turn manual pilot valve to "ON." For standing pilot system, press on pilot relay knob, light pilot and keep relay knob depressed for one minute then release. Once the pilot is lit, the power will be supplied to the gas valve(s) upon activation of the aquastat.

e.Slowly turn manual gas valve to "ON."

f.Reset all safety switches (manual reset high limit, low water cutoff, etc.).

g.Turn on main electric switch.

h.Set temperature controller (aquastat) to desired temperature. Pilot will light automatically (intermittent ignition pilot system) and ignite main burners whenever the aquastat calls for heat.

i.Adjust the pool aquastat as follows:

When the pool water has reached the desired temperature, as measured with an accurate thermometer, decrease the aquastat setting with a small screwdriver until the boiler shuts off. The pool boiler will maintain the existing pool water temperature automatically.

3C. To Turn Off Boiler

1.Turn off main electrical switch.

2.Close all manual gas valves.

3D. Spring and Fall Operation

When the pool is not going to be used for a long period of time, turn the aquastat down to approximately 70o F. This will prevent the pool and surrounding ground from becoming chilled, save on fuel costs, and also permit the pool water temperature to be raised back to swimming temperature in a shorter period of time.

The pool water temperature should not be maintained below 70o F. Colder water will cause condensation to form on the heat exchanger when the boiler does fire. Prolonged operation at a lower temperature will cause the boiler to foul externally. See “Improper Use of Boiler.”

3E. Winter Operation

To shut down the boiler for longer periods, turn both the manual gas valve and pilot gas valve to OFF. Where the danger of freezing does not exist, the normal filter cycle should be continued all year long to circulate water through the system even when the boiler is turned off or shut down completely.

3E-1. Draining Boiler Before Freezing

If the boiler is located where it will be exposed to freezing temperatures, it should be drained before the first frost. Drain the boiler by removing the drain plug on the bottom of the front header casting. Leave the plug out until time to use the boiler again. The boiler must be level for proper drainage. If compressed air is used to blow out the lines, it is still necessary to follow the same procedure. Keeping the pool heated by continuously running the boiler may not be adequate protection due to the possibility of a pump or power failure.

3E-2. Improper Use of the Boiler

The Model MT pool boiler is not designed for continuous use as an anti freezing device for pools.

Operating the boiler at water temperatures below 70o F will cause the heat exchanger fins to be partially blocked with condensation, resulting in incomplete combustion. Prolonged operation under these conditions will result in sooting of the heat exchanger which can seriously damage the boiler and cause a fire hazard.

MT specifications

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