LG ARUM072BTE5 Installation Manual page 173

Heat Recovery Unit
Description
Heat recovery unit is installed properly: Cannot be installed upside down or at any angle. It must be installed indoors, top-side up,
level.
Piping is insulated properly per the design engineer's specifications. Insulation is snug against the housing of the heat recovery unit.
DIP switches and rotary dial settings are correct.
If large capacity indoor unit, a Y-branch is installed properly.
Condensate Pump / Drain Installation
Description
Indoor unit condensate drain pipes were installed correctly.
All condensate vertical risers are equal to or less than 27-1/2 inches from the bottom of the indoor unit.
Indoor units with condensate pumps were level. Units with gravity drains were level or slightly canted toward the drain connection
and are supported properly.
Pumped condensate drain lines were properly connected (do not have traps, and connect to the top surface of the main drain line).
Condensate lines are properly insulated to prevent condensation.
Power Wire and Communications Cables
Description
Record power three phase 208-230V source or three phase 460V (verify system electrical requirements).
R (L1) to Ground ____________________
S (L2) to Ground ____________________
T (L3) to Ground _____________________
Ground wire was installed and properly terminated at the outdoor unit(s).
The power supplied was clean with voltage fluctuations within specifications (±10% of nameplate for 208-230V units, 414-528V for
460V units).
Power wiring to the outdoor unit(s) was installed per all local, state, and NEC requirements.
Power wiring to each indoor unit was installed per all local, state, and NEC requirements.
Communications cable between the outdoor unit(s) and indoor units was connected in a daisy chain configuration (i.e., single paral-
lel chain). No "star" or multiple parallel circuits. No cable splices or wire nuts were used to connect communications cables.
Record Communication Voltage Range
High ___________ VDC
Proper communications cable was used between each indoor unit and its zone controller where applicable. No cables were spliced
and no wire nuts are present.
Communication type RS-485 BUS type.
Communication cable between Master ODU to Slave ODU(s), and Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded to the Master ODU chassis only. Cable
segment shields are tied together.
Use appropriate crimping tool to attach ring or fork terminals at all power wiring and control cable terminations.
All power and control wires were properly separated using the recommended distance provided in the product installation manual.
Only LG-supplied Y-cables were used between grouped indoor units.
Due to our policy of continuous product innovation, some specifications may change without notification. ©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
INSTALLATION CHECKLIST
R - S ______________________________
R - T ______________________________
S - T ______________________________
Sum of the Above ____________________
Divided by 3 _________ = Average Voltage
% Imbalance = Maximum Deviation from Average / Average x 100
Example:
Measured Values: 242, 241, 246
Sum of Measured Values: 729
Average of Measured Values: 729 / 3 = 243
Maximum Deviation from Average: 246 - 243 = 3
% Imbalance: 3 / 243 x 100 = 1.23%
Low ____________ VDC
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