Carrier WeatherMaster 48HC Series Installation Instructions Manual page 17

Fig. 21 — Thru-the-Base Fitting Assembly (Shown in
BRASS FITTING FOR 3 TO 6 TON UNITS.
Fig. 22 — Thru-Base Connection Fittings (Units Built
Downloaded from ManualsNet.com
Shipping Position)
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
Prior to 4/15/2019)
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HIGH VOLTAGE
CONDUIT
CONNECTOR
AUXILIARY
POWER
SUPPLY
(OPTIONAL)
Fig. 23 — Thru-Base Connection Fittings (Units Built
On and After 4/15/2019)
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 connector 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,
aligning the holes in the gasket to the holes in the basepan.
See Fig. 21.
4. Install the connector plate assembly to the basepan using 8
of the washer head screws.
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. At-
1
2
tach a 1 / -in. pipe nipple with minimum length of 16-in. (406 mm)
2
(field-supplied) to the street elbow and extend it through the ac-
cess panel at the gas support bracket. See Fig. 24.
BRASS FITTING
EMBOSSMENT
FOR 3-6 TON UNITS
Fig. 24 — Gas Line Piping for 3 to 5 Ton Units Only
Other hardware required to complete the installation of the gas
supply line includes 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 pres-
sure). 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 shutoff valve be located upstream of the sediment
trap. See Fig. 25 and 26 for typical piping arrangements for gas
17
BRASS FITTING FOR
3 TO 6 TON UNITS
LOW VOLTAGE
CONDUIT
CONNECTOR
SUPPORT
BRACKET