10. Installation
Installing the water pipes
1
Remove the caps from the water pipe inlet and outlet.
Air vent valve
IN
(water pipe inlet)
OUT
(water pipe outlet)
2
Be sure to check the positions of the water pipe inlet
and outlet of the fan coil unit by finding their labels (IN
and OUT) attached.
• The water pipe inlet label is printed with IN and the
water pipe outlet label with OUT.
• Note that the air vent valve is attached to the side
where you can find the water pipe outlet.
Appearance
OUT (outlet)
IN (inlet)
CAUTION
• Failure to connect the water pipes may cause
performance degradation.
• Be sure to insulate both the inlet and outlet pipings.
3
Before connecting the water pipes, be sure to install a
2-way electric valve.
• Be sure to install the 2-way electric valve on the
inlet side pipe.
•
•
When circulating cold/hot water, open the air vent
valve and use a tube to receive water so that the
air inside the pipe and coil is sufficiently removed,
and then close the valve. Failure to do so may cause
performance degradation and noise.
Before connecting the water pipes., check if
the water pipe Flexible tube (loose nut PF 3/4")
specification is correct. After connecting the water
pipes, remove foreign objects from them, and then
circulate water to check for water leakage.
Air vent valve
Installation site area
2-way
electric valve
Loose nut (PF 3/4")
Loose nut (PF 3/4")
Flexible tube
Ceiling
CAUTION
• Be sure to install a 2-way electric valve on the water pipe
inlet of the fan coil unit.
Failure to do so may cause condensation and product
malfunction.
• Attach a 40 mesh strainer to the inlet piping
(Installation site area)
•
•
If there is no strainer installed, foreign objects may
enter the pipe, causing malfunction and performance
degradation to the 2-way electric valve, condensation,
or water leakage, etc.
When the temperature of intake water is higher than
65 ℃, the protection control of the product may be
activated.
•
•
•
If the outside temperature is lower than 0 ℃ during
winter, the inside of the heat exchanger may freeze
and burst. To prevent this, operate a water pump and
operate the product to open the 2-way electric valve.
When the product is not used for a long period of time
in winter, drain all the water from the heat exchanger
and the entire water piping system.
If both the room temperature and the piping
temperature are 5℃ or less, the 2-way electric valve
automatically opens to prevent freezing and bursting.
• Use frost preventive additives to prevent the
circulating water from freezing in winter.
• Check if the rated flow rate is being supplied.
Low flow rates may cause performance degradation or
product malfunction.
4
Wind Teflon tape (10 to 15 times) around the threads of
the water pipe inlet/outlet Flexible tube of the fan coil
unit in the thread direction.
CAUTION
• When connecting the pipes, tighten sufficiently with a
monkey wrench and a torque wrench as shown in the
figure above. Failure to do so may cause water leakage.
• When operating the product for the first time or
restarting it after a long period of stoppage, open the
air vent valve of the heat exchanger and use a tube to
receive water so that the air inside the pipe and coil is
sufficiently removed, and then close the valve.
