Electrical - LG DOAS Installation And Operation Manual

Electrical

• Verify the unit name plate matches the power supply.
• The unit is provided with a single point power wiring connection. The connection terminals are made to the main terminal block. A complete
wiring diagram including factory and field wiring can be found inside the control compartment door.
• Route power and control wiring separately. Do not run the power and control signal wires in the same conduit.
• All units require field supplied electrical overcurrent and short circuit protection. The device must not be sized larger than the maximum
overcurrent protection (MOP) shown on the nameplate.
• Local codes may require a disconnect switch to be within sight of the unit. The disconnect switch should not be installed on the DOAS unit.
• The electrical supply can enter the unit through the bottom or the side of the controls compartment.
• A single point connection to a terminal block is provided with the unit. High voltage conductors must be placed in the control panel in a
separate opening and separate conduit from low voltage conductors.
• To pass a wire through the wall or roof of the unit, cut an opening and pass the conduit through it. Follow the procedure below to safely cut
an electrical opening.
Table 4: Dedicated Outdoor Air System Electrical Data
Model
ARND20BDAT2
ARND20BDAR2 (no preheat)
MCA = Minimum Circuit Ampacity MOP = Maximum Overcurrent Protection
Power wiring cable is field provided and must comply with the applicable local and national codes.
Cutting an Electrical Opening
1. Select the location for the opening. Ensure the conduit will not interfere with the operation of any components, prevent door access or
prevent a panel from being removed.
Field cut openings must be a minimum of 6 inches away from all components and wiring to prevent damage caused by drilling or cutting.
2. Drill a pilot opening all the way through the foam panel.
3. Using a hole saw, cut the opening through the metal on both sides of the foam area.
If a reciprocating saw is used to make the cut-out, ensure that the metal shavings from the foam part do not separate from the foam. If the foam
is separated, it can result in structural damage of the part.
4. Using a knife, cut the foam from the opening.
5. Install the conduit.
6. After the conduit is installed in the opening, caulk the sides with an industrial grade silicone sealant or a duct seal compound.
If a larger opening is needed for additional duct connections not provided by the factory, it is imperative that the foam be completely sealed.
Insulation covers must be fabricated from sheet metal to cover the foam at the cut. The edges and corners that are not covered need to be
sealed using silicone caulking or a duct seal compound.
• Size supply conductors based on the unit minimum current ampacity (MCA). Supply conductors must be rated at a minimum of 75°C.
• Wire power leads to the unit's terminal block or main disconnect. All wiring beyond this point has been completed by the factory and cannot
be modified without effecting the unit's agency and/or safety certification.
• The supply voltage must be within the minimum and maximum range displayed on the unit nameplate. The available short circuit current
should not exceed the short circuit current rating (SCCR) shown on the unit nameplate.
Three phase voltage imbalance will cause motor overheating and premature failure. The maximum allowable imbalance is 2.0%. Voltage imbal-
ance is defined as 100 times the maximum deviation from the average voltage divided by the average voltage.
• Check the voltage imbalance at the unit disconnect. Contact your local power company for line voltage corrections.
• The installing contractor must check for proper motor rotation and check blower motor amperage listed on the motor nameplate is not
exceeded.
LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG Life's Good" is a registered trademark of LG Corp.
Voltage
MCA
Range
187-253 96
187-253 8
Due to our policy of continuous product innovation, some specifications may change without notification.
Power Supply
MOP
Hz Volts
100 60 208-230
15 60 208-203
ELECTRICAL
Phase
3
1
15