Pentair 75 User Manual download pdf (Page 13)

Rev. E 5-16-01 P/N 471105

PRESSURE SWITCH

The pressure switch will keep the circuit open when the

pump is not on and operating. When the filter pump

turns on, the pressure switch closes the circuit and the

heater will operate. When the heater is installed below

water level of a spa or pool, adjustment of the pressure

switch may be required. For adjustment of pressure

switch, we recommend the following procedures.

1. Backwash the filter and clean the pump hair and

lint basket before making any adjustment to the

pressure switch.

2. Switch the circulation pump on and make sure it

is primed.

3. Push the heater power switch on and set the

thermostats to their highest temperature settings.

4. Clean the locktight off of the pressure switch

adjustment knob threads.

5. Turn the adjustment knob clockwise or away

from the micro-switch, until the heater shuts

down; see Figure 11.

6. Turn the adjustment knob counter-clockwise 1/2

turn and the heater should refire.

7. Turn the pump off

and the heater should

shut down. If the

heater does not shut

down, repeat the

procedure.

8. Switch the pump off

and on several times

to assure proper

adjustment.

PLUMBING CONNECTIONS

The MiniMax 100 heater has the unique capability of

direct schedule 40 or 80 CPVC/ABS/PVC plumbing

connections. Either a Quick-Flange or Quick-Flange II

(depending on model ordered) has been included with the

MiniMax 100 to insure conformity with Pentair Pool

Products recommended CPVC/ABS plumbing procedure;

see Figure 9. Other plumbing connections can be used.

The instructions on the following pages show the methods

for successfully connecting plumbing to the inlet/outlet

header with either the Quick-Flange or Quick-Flange II.

MANUAL BY-PASS

Where the flow rate exceeds the maximum 80 GPM, a

manual by-pass should be installed and adjusted. After

adjustments are made, the valve handle should be

removed to avoid tampering.

Model Min. Max.*

100 20 80

* Do not exceed the maximum recommended

flow rate for the connecting piping.

VALVES

When any equipment is located below the surface of

the pool or spa, valves should be placed in the

circulation piping system to isolate the equipment from

the pool or spa.

Check valves are recommended to prevent back

siphon; see Figure 10.

Caution: Exercise care when installing chemical

feeders so as to not allow back siphoning of

chemical into the heater, filters or pump.

Installation (contd.)

Figure 11.

Adjustment

Knob

Figure 9.

MiniMax 100

High Performance Heater

COLD

POOL TEMP

HOT

OFF

PacFab

GATE VALVE

PUMP

GATE VALVE

FILTER

HEATER

FROM POOL

VALVE

CHECK

TO POOL

Figure 10.

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Pentair 75 User Manual Page 13

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