Carrier 48TC Instruction Manual download pdf (Page 12)

EMBOSSMENT

BRASS FITTING

FOR 3-6 TON UNITS

SUPPORT

BRACKET

C08016

Fig. 15 -- Gas Line Piping for 3 to 6 Ton Units Only

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 shutoff

valve be located upstream of the sediment trap. See Figures

16 and 17 for typical piping arrangements for gas piping that

has been routed through the sidewall of the curb. See Fig. 18

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.

9” (229mm) min

Union

Shut Off

Valve

Drip

Leg

Thru-Curb Adapter

Unit Base Rail

C07469

Fig. 16 -- Gas Piping

Drip

Leg

Shut Off

Valve

Union

Thru-Curb Adapter

Burner

Access

Panel

9” (229mm) min

Unit Base Rail

C07470

Fig. 17 -- Gas Piping

C08018

Fig. 18 -- Gas Piping Thru--Base Connections

When installing the gas supply line, observe local codes

pertaining to gas pipe installations. Refer to the NFPA

54/ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSA

B149.1). In the absence of local building codes, adhere to

the following pertinent recommendations:

1. Avoid low spots in long runs of pipe. Grade all pipe

/4--in. in every 15 ft (7 mm in every 5 m) to prevent

traps. Grade all horizontal runs downward to risers.

Use risers to connect to heating section and to meter.

2. Protect all segments of piping system against physical

and thermal damage. Support all piping with appro-

priate straps, hangers, etc. Use a minimum of one

hanger every 6 ft (1.8 m). For pipe sizes larger than

--in., follow recommendations of national codes.

3. Apply joint compound (pipe dope) sparingly and only

to male threads of joint when making pipe connec-

tions. Use only pipe dope that is resistant to action of

liquefied petroleum gases as specified by local and/or

national codes. If using PTFE (Teflon) tape, ensure

the material is Double Density type and is labeled for

use on gas lines. Apply tape per manufacturer’s in-

structions.

48TC

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Carrier 48TC Instruction Manual Page 12

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