Installation Space; Water Control - LG Multi V PRHR033 Installation Manual

6

INSTALLATION SPACE

Individual Installation
During the installation of the unit, consider service, inlet, and outlet
acquire the minimum space as shown in the figures below.
: Service area
Product
(Outdoor unit)
Water pipe
installation
space
Service area Service area Service area
(Front) (Front) (Front)
350(13-25/32)
20(25/32)
772(30-13/32)
100(3-15/16)
<Top View>
Collective / Continuous Installation
Space required for collective installation and continuous installation as
shown below considering passage for air and people.
: Service area
Product Product
(Outdoor unit) (Outdoor unit)
Service area Service area
(Front) (Front)
350(13-25/32) 350(13-25/32)
772(30-13/32) 772(30-13/32)
20
100(3-15/16)
(25/32)
<Top view>
* In case of the water pipe passing side product, please make
sufficient service place to avoid occurring between water pipe and
product side.
Two Layer Installation
Space required for two layer installation as shown below considering
passage for air and people.
: Service area
H-Beam Support
<Front View>
(Unit: mm(inch))
H-Beam Support
<Front View>
(Unit: mm(inch))
Product
(Outdoor unit)
Service area
(Front)
350(13-25/32)
772(30-13/32)
100(3-15/16) 100(3-15/16)
(Unit: mm(inch))
100(3-15/16)
1 120(44-3/32)
100(3-15/16)
100(3-15/16)
1 120(44-3/32)
100(3-15/16)

WATER CONTROL

Water control
• Keep the water temperature between 10~45 °C (50~113 °F). Other it
may cause the breakdown.
- Standard water supply temperature is 30 °C (86 °F) for Cooling and
20 °C (68 °F) for heating.
• Properly control the water velocity. Otherwise it may cause the
noise, pipe vibration or pipe contraction, expansion according to the
temperature. Use the same water pipe size connected with the
product or more.
• Refer to the water source pipe diameter and water velocity table
below. As the water velocity is fast, air bubble will increase.
Diameter [mm(inch)] Velocity range (m/s)
< 50(1-31/32)
50(1-31/32) ~ 100(5-7/8)
100(5-7/8) <
• Be careful of the water purity control. Otherwise it may cause the
breakdown due to water pipe corrosion.
(Refer to 'Standard Table for Water Purity Control')
• In case the water temperature is above 40 °C (104 °F), it is good to
prevent the corrosion by adding the anticorrosive agent.
• Install the pipe, valve and gauge sensor in the space where it is easy
to maintain. Install the water valve in the low position for drain, if
required.
• Be careful not to let air in. If so, the water velocity will be unstable in
the circulation, pump efficiency will also decrease and may cause the
piping vibration. Therefore, install the air purge where it may
generate the air.
• Choose the following anti freezing methods. Otherwise, it will be
dangerous for the pipe to break in the winter.
- Circulate the water with the pump before dropping the
temperature.
- Keep the normal temperature by boiler.
- When the cooling tower is not operated for a long time, drain the
water in the cooling tower.
- Use an anti-freeze. (For using an anti freeze, change the DIP switch
on main PCB in outdoor unit.)
- Refer to the additive amount about freezing temperature as in the
table given below.
Minimum temperature for anti freezing [°C(°F)]
Anti freeze type
0
Ethylene glycol (%) 0
Propylene glycol (%) 0
Methanol (%) 0
• In addition to anti freeze, it may cause the change of the pressure in
the water system and the low performance of the product.
• Make sure to use the closed cooling type tower.
When applying the open type cooling tower, use a 2nd heat
exchanger to make the water supply system a closed type system.
Standard table for water purity control
The water may contain many foreign substances and hence may
influence the performance and lifetime of the product due to the
corrosion of the condenser and water pipe. (Use water source that
complies with the below standard table for water purity control.)
If you use water supply other than the tap water to supply the water
for the cooling tower, you must do a water quality inspection.
• If you use the closed cooling tower, the water quality must be
controlled in accordance with the following standard table.
If you do not control the water quality in accordance with the
following standard water quality table, it can cause performance
deterioration to the air conditioner and severe problem to the product
0.6 ~ 1.2
1.2 ~ 2.1
2.1 ~ 2.7
-5 (23) -10 (14) -15 (5) -20 (-4) -25 (-13)
12 20 30 -
17 25 33 -
6 12 16 24
-
-
30