Chiltrix AC series Heating & Cooling series CX30, Installation And Operation Manual

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Second Heat Source or Assistant Electric Heater
Parameter 27, 28 usage If you set parameter 27 to "0", E2 is the assistant electric heater control port, if
you set parameter 27 to 1, E2 will be 2nd heat source control port. If the E2 port is the assistant electric
heater control port, it is controlled by parameter 10. If air temp < Parameter 10, E2 will be active. But it
will not start at once, if the compressor cannot reach target temp within 15 minutes, it will energize the
relay coil at E1& E2. The compressor will work together with E2. If E2 is 2nd heat source control port, it is
controlled by parameter 28. When air temp is lower than parameter 28 (default -15c), E2 will be energized
and the compressor will stop. Only the 2nd heat source is working with E2. You can connect the electric
boiler on/off signal to E2. E2 only provides an "on/off" signal. You can connect your own controls, it's max
current is 1 amp. You must add a relay to protect the heat pump PCB, so if there are any problems from
the electric boiler, it will not damage the heat pump PCB. If your winter is not too cold (above -15c), you
can use E2 as an assistant electric heater. If your winter is too cold, (lower than -18c~-20c), the compressor
will work too hard, so you should set E2 as 2nd heat source port to protect the heat pump.