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Rev. B 1-20-04 9 P/N 472299
• THERMOSTAT
This light is on when the thermostat contacts close, signaled by the water temperature falling below the
set-point, calling for the heater to fire to maintain the desired water temperature.
• HEATING
The heating light is on any time the thermostat has signaled a call for heat which initializes the ignition
safety circuit — the light comes on indicating successful firing of the main burners and stays on until the
pool/spa reach the water temperature setting.
• SERVICE
The service light is off during normal operation of heater. The light only comes on if a problem with a
control has occurred or when the heater is first firing. The problem must be investigated by the technician
prior to attempts to fire the heater again.
SECTION VI. TEMPERATURE SETTING
The heater comes factory set at 78° F. for the pool mode and 100° F. for the spa mode, using the
up and down arrows, you can set the thermostats to a minimum temperature of 65° F., or a maximum
of 104° F. If you desire to heat only one body of water, the thermostat is capable of an off mode. As
an example, if you only wish to heat the spa and not the pool, simple depress and hold the pool down
arrow, and the thermostat will lower its setting to 65° F. then go to an off mode. If there is a remote
system connected to the heater, please see the special thermostat setting features under Heating Mode
Selection & Remote mode.
SECTION VII. HEATING MODE SELECTION
1. Off Mode: The heater will not come on. NOTE: The "Off" display on the Digital Display
Temperature Controller does not mean that the heater is off. It only states that the pool or spa
thermostat has been turned off.
2. Spa Mode: The heater will operate and heat the spa to the desired temperature.
3. Pool Mode: The heater will operate and heat the pool to the desired temperature.
4. Remote Mode: The DDTC is compatible with two and three wire remote control systems.
In order to operate by a remote control system, the REMOTE mode must be selected on the
front panel. When the REMOTE mode is selected, the REMOTE LED will light up.
SECTION VIII. REMOTE CONTROL
THE TWO-WIRE REMOTE CONTROL SYSTEM is typically installed and connected to the heater
for spa heating. The two-wire remote system is usually provided with a water temperature sensor that
monitors the system temperature and turns the heater on or off in response to the temperature of the spa.
To heat a spa, it should be connected to terminals J6 and J8. Pool heating remote control would
require connecting to terminals J5 and J8. If the REMOTE mode is set at the front panel LED light,
the DDTC will respond to a contact closure by remote system and heater will operate until the remote
system temperature setting is satisfied.