Carrier WeatherMaster 48HC14 Installation Instructions Manual page 14

FACTORY OPTION THRU-BASE CONNECTIONS
(GAS CONNECTION) — This service connection kit con-
sists of a 3 / -in. NPT gas adapter fitting (stainless steel), a
4
electrical bulkhead connector and a 1
connector, connected to an "L" bracket covering the embossed
(raised) section of the unit basepan in the condenser section.
See Fig. 18.
1 1 / " ELECTRICAL
2
BULKHEAD
CONNECTOR
3 / " NPT GAS
4
ADAPTER
FITTING
Fig. 18 — Thru-the-Base Option, Shipping Position
1. Remove the "L" bracket assembly from the unit (see
Fig. 18).
2. Cut and discard the wire tie on the gas fitting. Hand tight-
en the fitting if it has loosened in transit.
3. 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 connector plate assembly.)
NOTE: Take care not to damage the gasket, as it is reused in
the following step.
4. Place the gasket over the embossed area in the basepan,
aligning the holes in the gasket to the holes in the base-
pan. See Fig. 19.
5. Install the connector plate assembly to the basepan using
8 of the washer head screws.
NOTE: If gas and/or 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.
The thru-base gas connector has male and female threads.
The male threads protrude above the basepan of the unit; the
female threads protrude below the basepan.
Check tightness of connector lock nuts before connecting
gas piping.
Install a / -in. NPT street elbow on the thru-base gas fitting.
3
4
Attach a 3 / -in. pipe nipple with minimum length of 16-in. (406
4
mm) (field-supplied) to the street elbow and extend it through
the access panel at the gas support bracket. (See Fig. 20.)
1 / -in.
2
1 / -in. electrical bulkhead
2
1 / " ELECTRICAL
2
BULKHEAD
CONNECTOR
Fig. 19 — Completing Installation of Thru-the-
THRU-BASE
GAS FITTING
Fig. 20 — Gas Line Piping
Other hardware required to complete the installation of the
gas supply line will include a manual shutoff valve, a sediment
trap (drip leg) and a ground-joint union. A pressure regulator
valve may also be required (to convert gas pressure from
pounds to inches of pressure). The manual shutoff valve must
be located within 6-ft (1.83 m) of the unit. The union, located
in the final leg entering the unit, must be located at least 9-in.
(230 mm) away from the access panel to permit the panel to be
removed for service. If a regulator valve is installed, it must be
located a minimum of 4-ft (1220 mm) away from the unit's
flue outlet. Some municipal codes require that the manual shut-
off valve be located upstream of the sediment trap. See Fig. 21
and 22 for typical piping arrangements for gas piping that has
been routed through the sidewall of the curb. See Fig. 23 for
typical piping arrangement when thru-base is used. Ensure that
all piping does not block access to the unit's main control box
or limit the required working space in front of the control box.
14
CONNECTOR
PLATE
ASSEMBLY
GASKET
Base Option
3 / -in NPT
4
STREET
ELBOW
GAS
SUPPORT
BRACKET