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REFRIGERANT PIPING FOR SEPARATED
WATER SOURCE UNITS
1. Inverted traps are required when:
a. Piping in a horizontal direction from the outdoor Y-branch towards an outdoor unit or another outdoor unit Y-branch is greater than 6.6'.
The inverted trap must be installed close to the outdoor unit Y-branch (no more than 6.6' away).
b. Anytime piping turns downward leaving an outdoor unit Y-branch toward an outdoor unit or another outdoor unit Y-branch.
The inverted trap must be installed close to the outdoor unit Y-branch (no more than 6.6' away), and before the pipe toward the outdoor unit
turns downward.
Figure 36: Inverted Trap Applications.
To IDUs/
HRUs
Oil Trap
To IDUs / HRUs
Oil Trap
Oil Trap
Oil Trap
Pipe Slope
Horizontal pipe slope must be level or slightly away from the water
source units, otherwise refrigerant and oil will migrate toward the
water source units and accumulate in the pipe segment serving the
frame that is not running or at the lowest elevation.
Piping must never slope more than -10° (see figure) without in-
stalling an inverted trap within 6.6' of the water source unit Y-branch
and before the pipe slopes downward toward the water source unit.
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. "LG" is a registered trademark of LG Corp.
70 | LIMITS / PLACEMENT
Oil Trap
Figure 35: Examples of Inverted Traps.
To IDUs/
HRUs
Oil Trap
Oil Trap
Figure 37: Allowable Pipe Slope.
-10°
Toward indoor unit
.
PLACEMENT CONSIDERATIONS
Selecting the Best Location for the Water Source Unit(s)
DANGER
•
Do not install the unit in an area where combustible gas may generate, flow, stagnate, or leak. These conditions can cause a fire, result-
ing in bodily injury or death.
•
Do not install the unit in a location where acidic solution and spray (sulfur) are often used as it can cause bodily injury or death.
•
Do not use the unit in environments where oil, steam, or sulfuric gas are present as it can cause bodily injury or death.
• Water source units are not weatherproof. Always install water source units indoors. Failure to follow this installation guideline can create an
electrical hazard that can result in bodily injury or death.
Select a location for installing the water source unit that will meet the following conditions:
• Where the floor is waterproof and can bear the weight of the unit(s). The floor must contain a liquid drainage system and must have a slight
slope to aid in liquid drainage.
• Where there is enough strength to bear the weight of the water source unit.
• A location that allows for optimum air flow and is easily accessible for inspection, maintenance, and service.
• Where piping between the water source unit and indoor unit(s) / heat recovery units are within allowable limits.
• Install the unit(s) in a separate machine room not exposed to external air.
• Install the unit(s) in a space where the ambient temperature is within 32–104°F.
• Have an anti-freeze plan for the water supply if the unit(s) is stopped during cold weather.
Don'ts
• Where it will be subjected to direct thermal radiation from other heat sources, or an area that would expose the water source unit to heat or
steam like discharge from boiler stacks, chimneys, steam relief ports, other air conditioning units, kitchen vents, plumbing vents, and other
sources of extreme temperatures.
• Where high-frequency electrical noise / electromagnetic waves will not affect operation.
• Where operating sound from the unit will disturb inhabitants of the building.
• Where there is carbon fiber or combustible dust.
For placement considerations for Heat Recovery Units, refer to the applicable Engineering Manual on
For detailed placement considerations and installation requirements for indoor units, refer to the applicable Indoor Unit Engineering and / or Installa-
tion Manuals.
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. "LG" is a registered trademark of LG Corp.
Water Source Unit(s)
www.lgvrf.ca.
LIMITS / PLACEMENT | 71
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