Air-to-water Heat Pump
21
12 Thermostat
Installation of Thermostat is very similar to that of Remote air temperature sensor.
26
25
24
21
22
23
XT3
Heat
N
Thermostat
Thermostat
L
(230V)
27
28
Cool Heat
N
Cool
L
(24V)
Fig .1
How to Wire Thermostat
(1) Uncover the front cover of the indoor unit and open the control box.
(2) Identify the power specification of the thermostat, if it is 230V , find terminal block XT3 as
NO.21~24 or NO.23~26; Otherwise, if it is 24V, find terminal block XT3 as NO.25~28 or
NO.27~30;
(3) If it is Heating/Cooling thermostat, please connect wire as Fig 1 ;
CAUTION!
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 remote air
temperature sensor
④
Do not connect external electric loads, Wire (L) and (N) should be used only for operation
Electric type thermostat.
⑤
Never connect external electric loads such as valves, fan coil units, etc. If connected, PCB of
the indoor unit can be seriously damaged.
⑥
Installation of Thermostat is very similar to that of Remote air temperature sensor.
13 2-Ways Valve
2-way valve is required to control water flow while cooling operation. Role of 2-way valve is to
cut off water flow into under floor loop in cooling mode when fan coil unit is equipped for cooling
operation.
General Information
Type
Power
Operating Mode
Supported
NO 2-wire
230V 50Hz ~AC
Closing water flow
Yes
Opening water flow
Yes
NC 2-wire
230V 50Hz ~AC
Closing water flow
Yes
Opening water flow
Yes
(1) Normal Open type. When electric power is NOT supplied, the valve is open. (When electric
power is supplied, the valve is closed.)
(2) Normal Closed type. When electric power is NOT supplied, the valve is closed. (When
electric power is supplied, the valve is open.)
How to Wire 2-Way Valve:
Follow below procedures Step 1 ~ Step 2.
Step 1. Uncover front cover of the indoor unit and open the control box.
Step 2. Find terminal block and connect wire as below.
This function is only possible in the heating mode, the function priority for sanitary warm water is
not available if a thermostat is connected.
