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Turbotemp 125 Pool and Spa Heater Installation and User’s Guide

Section 2: Installation Instructions

This product must be installed and serviced by a professional service technician, qualified
in pool heater installation. Waterco Limited strongly recommends that all vents, pipes and
exhaust systems be initially and periodically tested for proper operation. This testing can be
accomplished by using a hand-held carbon monoxide meter and/or by consulting with a gas
professional.
Pool heaters must be used in conjunction with carbon monoxide detectors installed near the
pool heater. The carbon monoxide detectors must be periodically inspected for proper operation
so as to insure continued safety. Broken or malfunctioning carbon monoxide detectors must
be replaced immediately. If not fitted on the heater, installer must install any safety devices
according to the current local codes.

HEATER DESCRIPTION

Figure 10 shows a diagram of the heater and
how it operates. 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 flame holder. A
sealed heat exchanger surrounds the flame
holder, discharging exhaust gases out the flue.
5 cm (2”) PVC water piping connects directly
to the manifold/ header on the heat exchanger
using 4 cm (1.5”) 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

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 55° C (131° F), and

• the

air flow switch (AFS),

which senses the pressure drop across the air metering orifice,

• the

automatic gas shut-off (AGS) switch,

which opens if the heat exchanger outlet

temperature goes above 60° C (140° F).

• the

inlet temperature control switch,

which opens if the inlet temperature goes above 45°

C (110° F).

• the

stack flue sensor (SFS),

which shuts down the heater if the flue gas temperature

reaches 249° C (480° F).

The air flow switch (AFS) senses the pressure drop across the air metering orifice. As soon as
there is sufficient 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.

PUTTING THE HEATER INTO SERVICE

If the heater is installed below the level of the pool, or more than 0.6 meters (2 feet) above
pool level, the pressure switch setting should be adjusted. See “WATER PRESSURE SWITCH”
in the “SAFETY CONTROLS Section” (page 3) and the “CAUTION” under “BELOW POOL
INSTALLATION Section” (page 8).
Before putting the heater into service for the first time, follow the instructions under “BEFORE
START-UP” (page 1) in the front of this manual. Check for proper operation of the heater by
following the steps under, see page 11 “OPERATION INSTRUCTIONS.”

SPECIFICATIONS

(DIMENSIONS IN CENTIMETERS AND INCHES)

These installation instructions are designed for use by qualified personnel only, trained especially
for installation of this type of heating equipment and related components. Some states require
has installation and repair by licensed personnel. If this applies in your state, be sure your
contractor bears the appropriate license. See Figure 11 for Outdoor and Indoor Installations.

Figure 10.

Gas

Air

Mixer

Blower

Inlet

(Cold

Water)

Exhaust

Heating Coils

Outlet

(Mixed