2I. Boiler By-Pass Piping, 2J. Automatic Chlorinators

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Pentair Water Commercial Pool and Spa

Figure 7. Manual By-Pass Installation.

Therefore, the temperature difference between the inlet and out pipes will be so small as to be difficult to sense by touching the two pipes.

2I. Boiler By-Pass Piping

All Model MT pool boilers are equipped with an automatic flow control valve. Do not install a manual bypass valve unless the normal filtration rate exceeds 300 GPM. If the normal filtration rate exceeds that figure:

1.Install the manual bypass valve as illustrated in Figure 7.

2.Install a thermometer in the threaded opening in the rear header as shown in Figure 8.

3.Set the manual bypass valve as follows:

a.Clean or backwash the filter completely.

b.Close the manual bypass valve completely.

c.Close the boiler’s main gas valve.

d.Start the filtration system with all valves set for normal filtration.

e.After 3 minutes, record the thermometer reading (this is the pool water temperature).

f.Open main gas valve and turn the thermostat to its highest setting to start the boiler.

g.Gradually open the bypass valve until the temperature difference shown in column 6 of Table 4 is achieved. For example, if the temperature reading in Step “e” was 60 degrees, and the boiler is a Model 3500, the thermometer should read 75 degrees. Make sure this temperature difference remains constant for at least 5 minutes.

h.Remove the handle from the bypass valve to prevent anyone from changing the setting. The automatic flow control valve will maintain proper flow through the boiler regardless of the reduced water flow due to a dirty or clogged filter.

Figure 8. Thermometer Location.

			Bypass	Min.	Max.	Temp.
			Spring	Flow	Bypass	Rise
Indoor	Outdoor	Part	Color	Req'd	Valve	at Rear
Size	Size	No.	Code	(GPM)Cap.	(GPM)	Header
2000	------	S220	Black	110	300	15
2450	2200	S221	White	134	300	15
3050	2800	S221	White	167	300	15
3500	3200	S222	Brown	191	300	15
4050	3600	S222	Brown	221	300	15
4500	4000	S222	Brown	246	300	15
5000	4500	S222	Brown	273	300	15

	Table 4. By-Pass Valve Adjustments.

2J. Automatic Chlorinators

A concentration of chlorine in the boiler can be very destructive. Therefore, the following rules regarding the installation and operation of automatic chlorinators must be followed.

1.The chlorinator should be installed so that it introduces the gas or solution downstream from the boiler.

2.The chlorinator should be wired so that it cannot operate unless the filter pumps running.

3.The chlorinator should be provided with an anti- syphoning device so that when the pump shuts off, chlorine will not syphon back into the boiler.

4.When the chlorinator is installed in the system where the chlorine flows through the boiler, corrosion can occur. Excessive concentrations of chlorine, caused by improper adjustment or failure of the chlorination equipment, can cause boiler damage which is not covered by the warranty.

2K. Pressure Switch

The pressure switch on the boiler is factory set at 4 psi. Do not tamper with the switch unless the boiler is installed more than 3 feet below the surface of the

MT specifications

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Pentair MT warranty 2I. Boiler By-Pass Piping, 2J. Automatic Chlorinators, 2K. Pressure Switch

Models: MT