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3.6 SHXK814G2 wiring diagram of dual system of low temperature unit
Note: For heating/cooling model, CN 10 is After valve sensor 1, CN18 is After valve sensor 2. P14 is Chassis heating.
The water level switches K8, K9, and K10 are invalid; For hot water model, CN 10 is Return water temp sensor, CN18
is invalid, P14 is Water supply valve, the water level switches K8, K9, and K10 are effective.
4. Output description of replays
4.1 Compressor
（
220V/5A
）
1) the compressor will not stop running due to energy load reduction within 3 minutes after starting, except in the
emergency stop area of energy regulation and fault protection;
2) the delay of 3 minutes (minimum standby time) must be met when the compressor is turned off and then
turned on.
4.2 Fan Motor
（
220V/10A
）
1) Turn on the fan motor before starting the compressor;
2) Turn off the fan motor after the compressor shuts down;
3) In defrost mode, the fan motor is controlled according to the defrosting logic;
Fan-off unloading function: in the hot water mode, when the discharge gas temperature is
≥
P15, (default
105
℃
) and the ambient temperature is
≥
25
℃
, the fan turns off; when the discharge gas temperature is <
p15-5
℃
or the ambient temperature is
≤
23
℃
, the fan turns. When the parameter setting value for P15 is set as
130, cancel this function.
4.3 4-way Reversing Valve
（
220V/5A
）
1) the 4-way valve starts 10 seconds before the compressor starts (only in cooling mode);
2) the 4-way valve closes 2 minutes after the compressor shuts down.
4.4 Circulation Pump
（
220V/10A
）
In hot water mode, the circulating pump operates as below.
1) before the compressor starts, the circulating pump starts in advance;