Carrier 38AU Weatherproof Cover Installation, Field Control Wiring, Electrical Operation Hazard

38AU

NOTICE

Convenience Outlet Utilization

Maximum Continuous use : 8 Amps 24/7

50HJ542739 B

C10207

Fig. 15 - Convenience Outlet Utilization Notice Label

Test the GFCI receptacle by pressing the TEST button on the face of the receptacle to trip and open the receptacle. Check for proper grounding wires and power line phasing if the GFCI receptacle does not trip as required. Press the RESET button to clear the tripped condition.

Fuse on power type: The factory fuse is a Bussman “Fusetron” T-15, non-renewable screw-in (Edison base) type plug fuse.

!WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

Using unit-mounted convenience outlets: Units with unit-mounded convenience outlet circuits will often require that two disconnects be opened to de-energize all power to the unit. Treat all units as electrically energized until the convenience outlet power is also checked and de-energization is confirmed. Observe National Electrical Code Article 210, Branch Circuits, for use of convenience outlets.

Installing Weatherproof Cover: A weatherproof while in use cover for the factory installed convenience outlets is now required by UL standards. This cover cannot be factory mounted due its depth; it must be installed at unit installation. For shipment, the convenience outlet is covered with a blank cover plate.

The weatherproof cover kit is shipped in the unit’s control box. The kit includes the hinged cover, a backing plate and gasket.

DISCONNECT ALL POWER TO UNIT AND CONVENIENCE OUTLET.

Remove the blank cover plate at the convenience outlet; discard the blank cover.

Loosen the two screws at the GFCI duplex outlet, until approximately 1/2-in (13 mm) under screw heads are exposed. Press the gasket over the screw heads. Slip the backing plate over the screw heads at the keyhole slots and align with the gasket; tighten the two screws until snug (do not overtighten).

Mount the weatherproof cover to the backing plate as shown in Fig. 16. Remove two slot fillers in the bottom of the cover to permit service tool cords to exit the cover. Check for full closing and latching.

C09022

Fig. 16 - Weatherproof Cover Installation

All Units —

Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. See Tables 10 and 11. On 3-phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula shown in the legend for Tables 10 and 11, Note 5 (see page 22) to determine the percent of voltage imbalance. Operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.

Field Control Wiring —

38AU unit control voltage is 24 v. See Fig. 29 (38AUZ) and Fig. 30 (38AUD) for typical field control connections and the unit’s label diagram for field-supplied wiring details. Route control wires to the 38AU unit through the opening in unit’s end panel to the connections terminal board in the unit’s control box.

Remainder of the system controls connection will vary according to the specific construction details of the indoor section (air handler or packaged fan coil). Fig. 17 (38AUZ) and Fig. 18 (38AUD) depict typical connections to a Carrier 40RU fan coil unit. Plan for field connections carefully and install control wiring correctly per the project plan. Additional components and supplemental transformer accessory may be required.

The 38AU unit requires an external temperature control device. This device can be a thermostat (field-supplied) or a PremierLink controller (available as a field-installed accessory, for use on a Carrier Comfort Network or as a stand alone control).

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