Cambridge Engineering, Inc. 34 S-Series Technical Manual
SETTING TEMPERATURES
The Operating Electronic Thermostat requires two tem-
perature settings. When the temperature drops below
the HEAT ON setting, the heater will turn on. When
the heater raises the space temperature above the HEAT
OFF setting, the heater will turn off. This difference
provides an adjustable range of operation for the heater
which minimizes temperature swings.
The minimum run time and off time for the heater
regardless of temperature are both set at 2 minutes. The
allowable temperature range is 40°F to 99°F. The HEAT
OFF temperature can not be set lower than the HEAT
ON temperature.
1. Press and hold the
HEAT ON button while pressing
the
UP or the DOWN button until the desired tempera-
ture for the heater to turn ON is displayed.
2. Press and hold the HEAT OFF button while pressing
the
UP or the DOWN button until the desired tempera-
ture for the heater to turn OFF is displayed.
TEMPERATURE CALIBRATION
To compensate for lead wire resistance, it may be neces-
sary to make an adjustment to the displayed temperature
to correct it to the temperature measured at the thermis-
tor sensor. The calibration feature allows the displayed
temperature to be offset either above or below the actual
sensed temperature. Be sure to use an accurate tempera-
ture meter for making this correction.
1. Press and hold the
HEAT ON and HEAT OFF buttons
while pressing the UP or the DOWN button until the
correct temperature is displayed. ( A period [.] after
the temperature will indicate the Calibration Mode).
2. Pressing the UP or the DOWN button will display the
current calibration difference above or below (-) the
measured temperature.
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