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3. Installing the hydro unit
3.1. Checking the accessories with the hydro
unit
The following items are supplied with each hydro unit.
Item
1
Installation manual
2
Air vent manual
3
Auto air vent valve (3/4 parallel thread)
W250
32A screw-in
W350
housing (40A)
Strainer
4
(20 mesh)
40A screw-in
W500
housing (50A)
Refrigerant
W350
ø25.4 –ø28.58
5
connection
W500
(ø1 – ø1-1/8)
pipe
4. Connecting refrigerant pipes and drain pipes
4.1. Connecting refrigerant pipes
1. Be sure to use non-oxidative brazing where necessary. If you do not use non-
oxidative brazing, it may clog the pipes.
When brazing the outdoor unit connecting port of hydro unit, supply nitrogen gas
into the pipe between the outdoor unit and hydro unit.
2. After completing pipe connection, support the pipes to ensure that load is not
imparted to the hydro unit's end connections.
3. When using mechanical couplings, use the ones that meet ISO14903.
Warning:
When installing and moving the unit, do not charge it with refrigerant other
than the refrigerant (R32) specified on the unit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to
malfunction and result in severe damage.
Caution:
•
Use refrigerant piping made of phosphorus deoxidized copper and copper
alloy seamless pipes and tubes. In addition, be sure that the inner and outer
surfaces of the pipes are clean and free of hazardous sulphur, oxides, dust/
dirt, swarf, oils, moisture, or any other contaminants.
- R32 is high-pressure refrigerant and can cause the existing piping to burst.
•
Store the piping to be used during installation hydro unit and keep both
ends of the piping sealed until just before brazing. (Store elbows and other
joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and
compressor failure may result.
- Infiltration of a large amount of mineral oil may cause the refrigerant oil to
deteriorate.
•
Do not vent R32 into the atmosphere.
1. Size of hydro unit's end connection piping
[Fig. 4.1.1] (P.3)
1. Hydro units connectable to outdoor units
Standard models
Hydro unit
Unit model
Model name
PUHY-M200
CMH-
*1
PUHY-M250
WM250V-A
*2
*3
PUHY-M300
CMH-
*4
WM350V-A
PUHY-M350
PUHY-M400 *5
CMH-
PUHY-M450
WM500V-A
PUHY-M500
Model name
CMH-WM250V-A
CMH-WM350V-A
CMH-WM500V-A
Qty
1
1
1
1
1
1
High-efficient models
Hydro unit
Unit model
Model name
PUHY-EM200
CMH-
*1
PUHY-EM250
WM250V-A
*2
*3
PUHY-EM300
CMH-
*4
WM350V-A
PUHY-EM350
PUHY-EM400 *5
CMH-
PUHY-EM450
WM500V-A
PUHY-EM500
3.2. Installing hydro units
Bases
•
Be sure to install unit in a place strong enough to withstand its weight. If the base
is unstable, reinforce with a concrete base.
•
The unit must be anchored on a level surface. Use a level to check after installation.
•
If the unit is installed near a room where noise is a problem, using an anti-
vibration stand on the base of the unit is recommended.
[Fig. 3.2.1] (P.3)
A M10 anchor bolt (not supplied)
B (Incorrect installation) The corner section is not securely received.
C Fixing bracket for post-installed anchor bolts (not supplied) (To be fixed with three screws)
D Anti-vibration rubber pad (The pad needs to be large enough to cover the entire width of
each unit leg.)
Warning:
•
Be sure to install unit in a place strong enough to withstand its weight.
Any lack of strength may cause unit to fall down, resulting in a personal injury.
•
Have installation work in order to protect against earthquake.
Any installation deficiency may cause unit to fall down, resulting in a
personal injury.
Be sure to install the hydro unit horizontally. Check using a level. If the
unit is installed at an angle, drain water may leak out.
Caution:
•
Be sure to install the unit horizontally.
Install the hydro unit level (less than 1° tilt), so that the drain pan (option)
can function correctly.
2. Connecting pipe diameter of outdoor unit
Standard models
Unit model
Liquid
Gas
PUHY-M200
ø9.52 (ø3/8)
*1 ø9.52 (ø3/8)
PUHY-M250
ø22.2
*2 ø12.7 (ø1/2)
(ø7/8)
*3 ø9.52 (ø3/8)
PUHY-M300
*4 ø12.7 (ø1/2)
PUHY-M350
ø12.7 (ø1/2)
PUHY-M400 *5 ø12.7 (ø1/2)
ø28.58
PUHY-M450 ø15.88 (ø5/8)
(ø1-1/8)
PUHY-M500 ø15.88 (ø5/8)
3. Connecting pipe diameter of hydro unit
Liquid
CMH-WM250V-A
ø9.52 (ø3/8) ø22.2 (ø7/8)
CMH-WM350V-A
ø12.7 (ø1/2)
CMH-WM500V-A
ø15.88 (ø5/8)
If the connecting pipe diameter of hydro unit differs from that of outdoor unit, expand
or reduce the pipe diameter at the inlet of the hydro unit.
*1 When the piping length from the outdoor unit to the hydro unit is less than 90 m (295 ft)
*2 When the piping length from the outdoor unit to the hydro unit is 90 m (295 ft) or more
*3 When the piping length from the outdoor unit to the hydro unit is less than 40 m (131 ft)
*4 When the piping length from the outdoor unit to the hydro unit is 40 m (131 ft) or more
*5 When the unit is used alone
A To outdoor unit
B End connection (brazing)
C Hydro unit
D To main piping
E Indoor unit
Note:
•
Be sure to use non-oxidative brazing.
<Refrigerant piping connection examples>
•
Obtain joints and elbows on site as necessary according to the pipe diameter,
and connect the pipes as shown in the figures below.
[Fig. 4.1.2] (P.4)
(1) When routing the pipes through the front of the unit
(2) When routing the pipes through the bottom of the unit
(3) Pipe connection port and connecting pipe
<A> Liquid side
<B> Gas side
High-efficient models
Unit model
Liquid
Gas
PUHY-EM200 ø9.52 (ø3/8)
ø22.2
*1 ø9.52 (ø3/8)
(ø7/8)
PUHY-EM250
*2 ø12.7 (ø1/2)
*3 ø9.52 (ø3/8)
PUHY-EM300
*4 ø12.7 (ø1/2)
PUHY-EM350 ø12.7 (ø1/2)
ø28.58
PUHY-EM400 *5 ø12.7 (ø1/2)
(ø1-1/8)
PUHY-EM450 ø15.88 (ø5/8)
PUHY-EM500 ø15.88 (ø5/8)
Gas
ø25.4 (ø1)
ø25.4 (ø1)
A Refrigerant piping
B Elbow
C On-site piping
11
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