Gree GRS-CQ6.0Pd/Na-K Service Manual page 106

AIR-TO-WATER HEAT PUMP
Thermostat:
(L) : Live signal from PCB to thermostat
(N): Neutral signal from PCB to thermostat
How to Wire Thermostat
Uncover the front cover of the indoor unit and open the control box。
Identify the power specification of the thermostat，if it is 230V ，find terminal block
XT3 as NO.21～24; Otherwise，if it is 24V，find terminal blockXT3 as NO.25～28;
If it is Heating/Cooling thermostat ，please connect wire as Fig 1 ；
If it is Heating only thermostat ，please connect wire as Fig 2 ；
1) NEVER USE 230V AC and 24V AC Thermostat at the same time, otherwise, it will
cause short-circuit and power cut-off by circuit breaker;
2) setting temperature by Thermostat(heating or cooling) should be chosen within the
setting temperature range of the product ;
3) For other constrains, please refer to previous page where constrains about
4) Remote air temperature sensor
5) Do not connect external electric loads, Wire (L) and (N) should be used only for
operation Electric type thermostat.
6) Never connect external electric loads such as valves, fan coil units, etc. If connected,
PCB of the indoor unit can be seriously damaged。
7) Installation of Thermostat is very similar to that of Remote air temperature sensor,
Thermostat
Thermostat is generally used to control the product by air temperature. When
thermostat is connected to the product, the product operation is controlled by the
thermostat.
22 23
21
XT3
N
Heat
Cool
22 23
21
XT3
N
Heat
24 25
26
L
Heat
Cool
(230V)
Fig 1
24 25
26
L
Heat
(230V)
Fig 2
INSTALLATION
27 28
N
L
(24V)
27 28
N
L
(24V)
101