Pentair 75 User Manual download pdf (Page 7)

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

HEATER OPERATION

GENERAL

The MiniMax 100 DSI employs a microprocessor

based Direct Spark Ignition (DSI) system to light the

main burner and therefore has no pilot. The ignition

circuit operates at 24 VAC and requires that line

voltage 115/230 be supplied to the heater.

The MiniMax 100 MV (Millivolt) requires no external

power source and the control circuit derives all its

power from the energy generated from the standing

pilot/ thermopile-generator combination. Note: Some

states ,including California, have energy conservation

regulations preventing the sale and use of certain

standing pilot (millivolt) equipment.

The MiniMax 100 DSI Control utilizes a

microprocessor to continually and safely monitor,

analyze, and control the proper operation of the gas

burner. The DSI Control features LED diagnostics,

automatic one hour reset, and flame current test pins.

The LED is located on the DSI.

CONTROLS OPERATION (DSI SYSTEM)

Heat Mode

1. When a call for heat is received from the thermostat

supplying 24 volts to TH terminal on control, the

control will reset, perform a self check routine, and

flash the diagnostic LED for up to four seconds.

After a brief delay the gas valve is energized and

the ignition electrode begins to spark for the four

(4) second trial for ignition (TFI) period.

2. When flame is detected during the trial for ignition,

sparking is shut-off immediately and the gas valve

remains energized. The thermostat and main burner

flame are constantly monitored to assure the system

continues to operate properly.

a.When the thermostat is satisfied and the demand

for heat ends, the main valve is de-energized

immediately.

Screw A

Operation (contd.)

Knob Stopper

Figure 5.

OPERATING (CONTROLS)

DIRECT SPARK ELECTRONIC AND

MILLIVOLT MODELS

For convenience and economy all MiniMax 100

heaters are equipped with a thermostat on the front of

the heater control panel; see Figure 5.

Direct Spark MiniMax 100 heaters are equipped

with an electronic thermostat while Millivolt MiniMax

100 heaters have a mechanical thermostat.

The Pool/Off/Spa switch allows the heater to be turned

off when heating is not desired.

1. "ON" position - Maintains selected pool temperature.

2. "OFF" position - Heater will not come on regardless

of drop in pool temperature.

THERMOSTAT ADJUSTMENT

The knob with locking feature eliminates the need for

constant thermostat adjustments. Set the knob pointer

to the desired spa temperature.

NOTE

To eliminate error due to piping heat losses

measure pool temperature with an accurate

thermometer directly at the pool or spa.

If further adjustment is needed rotate the knob until

the desired temperature is obtained. This knob position

corresponding to your desired maximum pool or spa

temperature may now be preset (locked) by the knob

stopper which prevents the knob from being turned

beyond the maximum temperature you set.

THERMOSTAT KNOB STOPPER

Each thermostat is equipped with a mechanical stop

that can be locked or unlocked with use of a screw-

driver to prevent temperatures in excess of that

desired by the user; see Figure 5.

The maximum setting can be adjusted by loosening

the screw "A" and turning the stopper dial to desired

maximum setting. Lock the setting by tightening the

screw. The Mechanical stop is under the knob.

Ensure that the knob is stopping at the correct posi-

tion when the knob is rotated clockwise from a lower

temperature position.

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Pentair 75 User Manual Page 7

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