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Rev. E 4-19-05 P/N 472089
27
• 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.
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.
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.
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.
NOTE: With this type of two-wire remote, with its own temperature sensors and system control, using the
up arrows on the front of the DDTC, hold down the up arrow until you reach the maximum setting of
104° F., this allows the remote system thermostat to operate the heater at any set-point below 104° F., the
heater thermostats then act as a secondary controller if water temperature reaches 104° F.
THE THREE-WIRE REMOTE CONTROL SYSTEM will be connected to terminals J5, J6 & J8. J8 is the
common terminal. If the heater is in the REMOTE mode, the DDTC will monitor the terminals and respond
to a contact closure between J5 & J8 or J6 & J8. A contact closure between J5 & J8 will cause the DDTC to
switch to the POOL setting and control the heater to the DDTC pool set-point temperature. A contact
closure between J6 & J8 will cause the DDTC to switch to the SPA setting and control the heater to the
DDTC spa set-point temperature. If only heating the spa, then depress the pool down arrow until the display
goes to “Off”.
Section IV. Operation