Installation Of Water Pipe; Device Protection Unit - LG Multi V PRHR033 Installation Manual

16

INSTALLATION OF WATER PIPE

Water pipe system diagram
• The water pressure resistance of the water pipe system of this
product is 1.98 MPa (287.18 psi).
• When the water pipe passes indoors, make sure to execute heat
insulation on the pipe so that water drops do not form on the outer
side of the water pipe.
• The size of the drain pipe must be equal to or larger than the
diameter of the connecting product.
- Always install a trap so that the drained water does not back flush.
• Always install a strainer (50 Mesh or above) at the entrance of the water
pipe. (When sand, trash, rusted pieces get mixed into the water supply,
it can cause problems to the product due to blocking)
- If On/Off valve is applied, by interlocking with outdoor unit, it can
save the energy consumption of pump by blocking the water supply
to the outdoor unit not operating. Select appropriate valve and
install on site if necessary.
• Install a pressure gauge and temperature gauge at the inlet and
outlet of the water pipe.
• Flexible joints must be installed not to cause any leakage from the
vibration of pipes.
• Install a service port to clean the heat exchanger at the each end of
the water inlet and outlet.
• For the components of the water pipe system, always use
components above the designed water pressure.
Pressure gauge Temperature gauge
Water pipe
outlet Gate valve Service port
Water pipe
Inlet
Gate valve
Service port
CAUTION
!
Do not directly connect the drain outlet to the water pipe outlet.
(It can cause problems to the product.)
Water pipe connection
• The water pipe should be the same size of the connection on the
product or more.
• If necessary install the insulation material in the water pipe
inlet/outlet to prevent water drop, freeze and to save energy.
(Use the above 20 mm (25/32 inch) thickness PE insulation material.)
• Tightly connect the socket to the water pipe refer to below table for
recommended specification.
(Too much torque may cause the damage of the facility.)
Pipe thickness Shear stress Tensile stress
mm inch (kN) (kgf) (kN)
12.7 1/2 3.5 350
19.05 3/4 12 1 200
25.4 1 11.2 1 120
31.8 1 1/4 14.5 1 450
38.1 1 1/2 16.5 1.7
50.8 2 21.5 2.2 13.5
Strainer
Condensed
Drain line
water drain
Bending
Torque
moment
(N . m) (kgf . m) (N . m)
(kgf)
2.5 250 20 23 5
2.5 250 20 2 115
4 400 45 4.5 155
6.5 650 87.5 8.75 265
9.5 0.95 155 16 350
1.4 255 26 600

DEVICE PROTECTION UNIT

Strainer on water pipe
To protect the water cooling type product, you must install a strainer
with 50 mesh or more on the heat water supply pipe.
(It is recommended to install both a magnetic filter and a strainer.)
If not installed, it can result in damage of heat exchanger by the
following situation.
1
Heat water supply within the plate type heat exchanger is
composed of multiple small paths.
2
If you do not use a strainer with 50 mesh or more, alien particles
can partially block the water paths.
3
When running the heater, the plate type heat exchanger plays the
role of the evaporator, and at this time, the temperature of the
coolant side drops to drop the temperature of the heat water
supply, which can result in icing point in the water paths.
4
And as the heating process progresses, the water paths can be
partially frozen to lead to damage in plate type heat exchanger.
5
As a result of the damage of the heat exchanger from the freezing,
the coolant side and the heat water source side will be mixed to
make the product unusable.
1. Pollution of
Heat source
Heat Source
Water
Head loss of strainer on water pipe
8
6
4
2
0
0 10 20 30
25
GPM
12 HP
(kgf . m)
Upper graph is a theoretical value for selection and it may be different
3.5
according to specification of strainer.
11.5
15.5
26.5
35.5
61
Water pipe outlet
Water pipe
connection
Water pipe inlet
2. Partially frozen
Refrigerant
: Suggestion range
: Allowed range
8
6
4
2
0
40 0 20 40 60
50
GPM
20 HP
3. Damage
80