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The heater may not be installed within five feet of the
inside surface of a pool or spa unless it is separated by a
solid fence, wall or other permanent barrier.
A Propane (LPG) fired heater must not be installed in a
garage in Massachusetts, by order of the Massachusetts
State Fire Marshall. For more information, call the Fire
Marshall’s office.
DESCRIPTION OF THE HEATER
Figure 2 is a diagram of the heater showing how it oper-
ates.
Precisely matched orifice plates meter the air and gas
into the mixer. The blower draws the air and gas through
the mixer and forces it into the burner’s flameholder. A
sealed heat exchanger surrounds the flameholder, dis-
charging exhaust gases out the flue.
Two inch PVC water piping connects directly to the
manifold/header on the heat exchanger using 2" PVC slip
unions provided with the heater. The outer manifold
remains cool; no heat sinks are required. A thermal
regulator and an internal bypass regulate the water flow
through the heat exchanger to maintain the correct outlet
temperature. The heater operator control panel board
assembly is located on top of the heater.
SEQUENCE OF OPERATION
An electronic temperature sensing thermistor in the
manifold adapter inlet controls the heater operation.
When the inlet water temperature drops below the
temperature set on the operating control, the burner
controller supplies power to the combustion air blower
through a series of safety interlocks. The interlocks
consist of
• the pressure switch (PS), which senses that the pump
is running,
• the high limit switch (HLS), which opens if the heat
exchanger outlet temperature goes above 135° F
(57° C), and
• the automatic gas shutoff (AGS) switch, which opens
if the heat exchanger outlet temperature goes above
140° F (60° C).
• the stack flue sensor (SFS), which shuts down the
heater if the flue gas temperature reaches 500° F
(260° C).
The air flow switch (AFS) senses the pressure drop
across the air metering orifice. As soon as there is suffi-
cient air flow, the AFS closes, closing the circuit to the
hot surface igniter (HSI), which ignites the fuel mixture.
On a call for heat, the blower and HSI are energized. In
about 20 seconds, the gas valve opens and ignition
occurs. The HSI then switches to a sensing mode and
monitors the flame.
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.
OWNER’S OPERATING
INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE OPERATING
IF YOU DO NOT FOLLOW THESE
INSTRUCTIONS EXACTLY, A FIRE OR EXPLOSION
MAY RESULT, CAUSING PROPERTY DAMAGE,
PERSONAL INJURY OR LOSS OF LIFE.
START-UP AND OPERATION
START-UP AND SHUTDOWN INSTRUCTIONS ARE ON THE
LABEL ATTACHED TO THE COVER OF THE APPLIANCE
CONTROL BOX.
BEFORE START-UP
A. 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.
B. BEFORE OPERATING check for odor. Sniff all around
the appliance area for gas. Be sure to sniff next to
the floor, because some gas (such as propane) is
heavier than air and will settle on the floor.
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.
WARNING
4
Gas
Air
Mixer
Blower
Inlet
(Cold
Water)
Exhaust
Heating Coils
Outlet
(Mixed
Water)
Burner
FIGURE 2