Mitsubishi Electric PWFY-P100VM-E-BU Data Book page 45

(1)-1 Cauton for water ppe nstallaton
Consder the followng when desgnng and nstallng a water ppng system.
• Do not use steel ppes as water ppes.
- Copper ppes or stanless steel ppes are recommended.If ron ppes are used n the exstng system, do not connect
a new crcut to the old one. Keep the exstng and new crcuts separate.
• Lght ppes are smlar to other ar-condtonng ppes, however, please observe the followng precautons durng
nstallaton.
• Before a long period of non use, purge the water out of the pipes and thoroughly let them dry.
• Use a closed water crcut.
• When usng the unt for coolng, add brne to the crculatng water to prevent t from freezng.
• When nstalled n a low-ambent temperature envronment, keep the water crculatng at all tmes. If that s not
possble, purge the water out of the ppes completely.
• Do not use the water used for ths unt for drnkng or food manufacturng.
• When the ambient temperature is 0 ˚C or lower during stop operation, keep the water circulating at all times, or
purge the water out of the ppes completely.
Model
PWFY-P100VM-E-BU
PWFY-P100VM-E-AU
PWFY-P200VM-E-AU
*1 When the attached expan-
son jonts are nstalled.
(2) Selectng a water pump
Use a pump that is large enough to compensate for the total water pressure loss and to supply sufficient water to the unit.
(3) Installng the straner
• Install the strainer at the angle of 45˚ or less as shown in [Fig. IV 3.(3).1].
• Install the suppled straner at the water nlet.
[Fg. IV 3.(3).1]
(A)
(4) Precautons durng nstallaton
• Use the reverse-return method to nsure proper ppe resstance to each unt.
• To nsure easy mantenance, nspecton, and replacement of the unt, use a proper jont, valve, etc. on the water
ntake and outlet port. In addton, be sure to nstall a straner on the water ntake ppe. (In order to mantan the heat
source unt, a straner on the crculatng water nlet s necessary.)
* An example of the heat source unt nstallaton s shown n the dagram below.
• Install a sutable ar vent on the water ppe. After sendng water through the ppe, be sure to vent the excess ar.
• Compressed water may form n the low-temperature sectons of heat source unt. Use a dranage ppe connected to
the dran valve at the base of the unt to dran the water.
• Install a back flow-prevention valve on the pump and a flexible joint to prevent excess vibration.
• Use a sleeve to protect the ppes where they go through a wall.
• Use metal fittings to secure the pipes, and install them so that they have maximum protection against breakage and
bendng.
• Do not confuse the water ntake and outlet valves.
• This unit doesn't have any heater to prevent freezing within tubes. When the water flow is stopped on low ambient,
take out the water from tubes.
• The unused knockout holes should be closed and the openng of refrgerant ppes, water ppes, power source and
transmission wires should be filled with putty and so on to prevent from rain. (field construction)
• Wrap some sealng tape around the screw part to prevent water leakage.
• Hold the ppe on the unt sde n place wth a spanner when nstallng the ppes or straner. Tghten screws to a torque
of 50 N . m.
• Water ppes can get very hot, dependng on the preset temperature. Wrap the water ppes wth nsulatng materals
to prevent burns.
• On the PWFY-P200VM-E-AU model, install the expansion joint (accessory) at the inlet after installing the strainer,
and outlet.
Water nlet
PT 3/4 Screw
PT 3/4 Screw
PT 1 Screw*1
(A) Y-type straner
- 38 -
Water outlet
PT 3/4 Screw
PT 3/4 Screw
PT 1 Screw*1