ULTRATEMP ETI™ Hybrid Heater Installation and User’s Guide
21
Sequence of Operation
An electronic temperature sensing gas-fired heater
thermistor in the inlet plumbing controls the heater
operation. When the inlet water temperature drops
below the temperature set on the operator control panel,
the control board supplies power to the combustion air
blower through a series of safety interlocks.
The heater interlocks consist of:
•
Water Pressure Switch (WPS)
: Senses that the
pump is running.
•
Automatic Gas Shut-off (AGS) Switch
: Opens
if the heat exchanger outlet temperature goes
above 140° F (60° C).
•
High Limit Switch (HLS)
: Opens if the heat
exchanger outlet temperature goes above 127° F
(53° C).
•
Air Flow Switch (AFS)
: Senses the pressure
drop across the air metering orifices.
•
Float Switch (CFS)
: Opens if the condensate
overflows at the float switch due to blockage
in the condensate drain hose or neutralizer
cartridge.
•
Stack Flue Sensor (SFS)
: Monitors flue gas
temperature and shuts down the heater if the gas
temperature reaches 185° F (85° C).
•
Thermal Fuse (TF)
: Opens if the flue gas
temperature reaches 215° F (102° C).
The air flow switch (AFS) senses the pressure
differential across the air metering orifice. As soon as
there is sufficient air flow, the AFS closes, completing
the circuit to the Direct Spark Ignition (DSI). The gas
ignition control then opens the gas valve and the fuel
mixture is ignited by the DSI. On a call for heat, the
blower is energized for 15 seconds, the gas valve
opens simultaneously as the direct spark igniters are
energized, then ignition occurs. The heater is equipped
with a digital operating control that enables the user to
pre-set the desired pool and spa water temperatures.
The control enables the user to select between pool and
spa heating, and features a digital display that indicates
the water temperature.
See page 25 for more details and explanations
regarding heater features and programming.
Pre-Startup
1. This appliance does not have a pilot. It
is equipped with an ignition device which
automatically lights the burner. DO NOT try to light
the burner by hand.
2. BEFORE OPERATING, smell all around the
appliance area for gas. Be sure to smell next to the
floor because some gas is heavier than air and will
settle on the floor.
3. Use only your hand to turn the gas control on or
off. Never use tools. If you cannot change the ON/
OFF setting by hand, don’t try to repair it, call a
qualified service technician. Forced or attempted
repair may result in a fire or explosion.
4. Do not use this heater if any part has been
under water. Immediately call a qualified service
technician to inspect the heater and to replace
any part of the control system and any gas control
which has been under water.
5. Do not operate the pool heater unless the pool or
spa is properly filled with water.
6. Before operating the appliance for the first time or
after it has been off for an extended time, perform
the following checklist:
a. Remove debris or other articles from inside
the heater and the area around the heater
and its exhaust vent. Make sure all openings
for ventilation and combustion are clear of
debris or obstruction.
b. Keep heater area clear and free from
combustibles, flammable liquids and
chemicals.
c. Check that all water connections are tight.
d. Water must be flowing through the heater
during operation. Make sure that pool/spa is
filled with water and have pump operating.
Check that water flow is unobstructed from
the appliance. When operating for the first
time or after an extended shut-down, run
filter pump for several minutes to clear all air
from the system.
WHAT TO DO IF YOU SMELL GAS
•
DO NOT try to light any appliance.
•
DO NOT touch any electrical switch; do not use
any phone in your building.
•
Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
•
If you cannot reach your gas supplier, call the
Fire Department.
ENGLISH
