7
Rev. D 1-19-00
P/N 471243
HEATER OPERATION
GENERAL
The Laguna 100K 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 Laguna 100K 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 Laguna 100K 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 Laguna 100K
heaters are equipped with a thermostat on the front of
the heater control panel; see Figure 5.
Direct Spark Laguna 100K heaters are equipped
with an electronic thermostat while Millivolt Laguna
100K 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.
