Rev. A 2-4-2000
P/N 471438
HEATER OPERATION
GENERAL
The MiniMax 100 DBI 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 a 230
VAC (50Hz) line voltage 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.
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
(DBI SYSTEM)
Heat Mode
1. When a call for heat is received from the
thermostat supplying 24 volts to TH/W, 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 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.
Users Section
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 2.
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.
SELECTOR DIALS
The selector dial (knob) eliminates constant thermostat
adjustments. Set the spa dial at 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 2.
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
position when the knob is rotated clockwise from a
lower temperature position.
OVERHEAT THERMOSTAT
A manual reset overheat thermostat is fitted on the
RHS of the unit adjacent to the flow header.
If the appliance will not light, press the overheat reset
button before contacting a service engineer.
If the overheat condition persists, contact a service
engineer or your gas supplier.
Screw A
Knob Stopper
Figure 2.
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