Design and Technical Manual

6. SYSTEM DESIGN
BASE HEATER

A base heater is a heating element that may be installed to melt the ice that may accumulate in •
the condenser drain pan.
This output signal is produced when the outdoor temperature drops down to 36°F (2°C), and •
releases at 39°F (4°C).
Circuit diagram example
z
1
2
3
4
Connector
AC240V
Base heater
*2
*1
connected unit
P.C . B
*1: Connect to pin 1 and pin 3. No connection pin2 and pin4.
*2: The allowable Input Power is 25W or less.
1
2
3
4
Connector
AC240V
Base heater
*3
*1
connected unit
P.C . B
*3: If a load greater than 25W is applied, a contactor or relay should be used to operate and control the base
heater.
ON
OFF
Operation
Stop
Heater
Output signal
status
Parts (Optional)
z
Parts name External connect kit
Model name UT Y-XWZ XZ4
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SYSTEM DESIGN SYSTEM DESIGN