Carrier WeatherMaster 50GC 04-06 Series Installation Instructions Manual Download Page 17

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nector allows the high-voltage power wires to pass through the

basepan. See Fig. 30.

Fig. 29 — Thru-the-Base Fitting Assembly (Shown in

Shipping Position)

Fig. 30 — Thru-Base Connection Fittings

1. Remove the “L” bracket assembly from the unit.
2. Remove connector plate assembly from the “L” bracket and

discard the “L” bracket, but retain the washer head screws

and the gasket (located between the “L” bracket and the con-

nector plate assembly).

NOTE: Take care not to damage the gasket, as it is reused in the

following step.
3. Place the gasket over the embossed area in the basepan, align-

ing the holes in the gasket to the holes in the basepan. See
Fig. 29.

4. Install the connector plate assembly to the basepan using 8 of

the washer head screws.

NOTE: If electrical connections are not going to occur at this time,

tape or otherwise cover the fittings so that moisture does not get

into the building or conduit in the interim.
Check tightness of connector lock nuts before connecting electri-

cal conduits.

Field-supplied and field-installed liquid-tight conduit connectors

and conduit may be attached to the connectors on the basepan.

Pull correctly rated high voltage and low voltage through

appropriate conduits. Connect the power conduit to the internal

disconnect (if unit is so equipped) or to the external disconnect

(through unit side panel). Remove one of the two knockouts

located on the bottom left side of the unit control box. Use this

hole for the control conduit.
UNITS WITHOUT THRU-BASE CONNECTIONS (ELEC-
TRICAL CONNECTIONS)
1. Install power wiring conduit through side panel openings.

Install conduit between disconnect and control box.

2. Install power lines to terminal connections as shown in

Fig. 18 on page 13.

Voltage to compressor terminals during operation must be within

voltage range indicated on unit nameplate. On 3-phase units, volt-

ages between phases must be balanced within 2% and the current

within 10%. Use the formula shown in the example below to de-

termine 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.
Example: Supply voltage is 230-3-60

Example: Supply voltage is 230-3-60

Determine maximum deviation from average voltage.
(AB) 227-224 = 3 v
(BC) 231-227 = 4 v
(AC) 227-226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.

This amount of phase imbalance is satisfactory as it is below the maxi-
mum allowable 2%.

FIELD CONTROL WIRING
The 50GC unit requires an external temperature control device.

This device can be a thermostat (field-supplied) or a System-

Vu™ controller (available as factory-installed option for use

on a Carrier Comfort Network

or as a stand alone control) or

the RTU Open Controller for Building Management Systems

using non-CCN protocols (RTU Open is available as a factory-

installed option only).
THERMOSTAT
Select a Carrier-approved accessory thermostat. When electric

heat is installed in the 50GC unit, the thermostat must be capable

of energizing the G terminal (to energize the Indoor Fan Contac-

tor) whenever there is a space call for heat (energizing the W1 ter-