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ELECTRICAL INFORMATION
Connection Procedure
Connection Procedure
DOAS unit installation best practices are to connect control wiring (low voltage) and then connect power wiring (high voltage).
apply power to the DOAS unit or any Multi V system component until authorized to do so by the system commissioning agent.
1. Ensure the input power is disconnected and there is no power on the power input cable.
2. Remove the knockout plugs from the control box. Remember the communications cable and the power cable must enter the control box
through different knockouts.
3. Install a field provided plastic or rubber grommet in the knockout holes to prevent wire chaffing.
4. If using conduit, connect the conduit to the control box using field provided fittings and industry best-practice procedures.
5. Ensure the power wiring is routed separately from the communications cable to the unit's terminal block (see figure).
communications cable near the power cable. Provide at least three (3) to four (4) inches of slack cable at each DOAS unit.
6. Connect the power wiring to the terminal block connections. Ensure the screws securely connect the wire to the terminals and are not
loose.
7. Polarity matters on the outdoor unit to DOAS unit communications bus, and must be maintained throughout the entire system. Be sure to
connect:
• IDU-A terminals (outdoor unit) to ODU(IDU)-A (DOAS unit) terminals and connect IDU-B terminals (outdoor unit) terminals to ODU(IDU)-B
(DOAS unit) terminals.
• Central-A terminals (outdoor unit) to ODU(CEN)-A (DOAS unit) terminals and connect Central-B terminals (outdoor unit) to ODU(CEN)-B
(DOAS unit) terminals.
Refer to the preceding pages for DOAS unit wiring
connections.
• Cross connecting the A and B terminals will cause
communications errors and system malfunction.
• Field-provided communication cable between Main
ODU to DOAS units to be 18 AWG, 2 (2 conductor),
twisted, stranded, shielded. Ensure the communi-
cation cable shield is properly grounded to the Main
ODU chassis only. Shield must be tied together so
it is continuous and insulated to prevent grounding
against DOAS unit electrical cabinet.
ground the ODU to DOAS unit communication cable
at any other point. Wiring must comply with all
applicable local and national codes.
36
Figure 27: Internal Routing in DOAS Units.
Do not
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.
Do not
Do not route the
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