Carrier 48TC**16 Fire Or Explosion Hazard, Orifice Hole, Condensate Drain Pan Side View

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 1/4-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 8 ft (2.4 m). For pipe sizes larger than 3/4-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.

4.Pressure-test all gas piping in accordance with local and national plumbing and gas codes before connect- ing piping to unit.

NOTE: Pressure test the gas supply system after the gas supply piping is connected to the gas valve. The supply piping must be disconnected from the gas valve during the testing of the piping systems when test pressure is in excess of 0.5 psig (3450 Pa). Pressure test the gas supply piping system at pressures equal to or less than 0.5 psig (3450 Pa). The unit heating section must be isolated from the gas piping system by closing the external main manual shutoff valve and slightly opening the ground-joint union.

Check for gas leaks at the field-installed and factory-installed gas lines after all piping connections have been completed. Use soap-and-water solution (or method specified by local codes and/or regulations).

!WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death and/or property damage.

SConnect gas pipe to unit using a backup wrench to

avoid damaging gas controls.

SNever purge a gas line into a combustion chamber. S Never test for gas leaks with an open flame. Use a

commercially available soap solution made specifically for the detection of leaks to check all connections.

S Use proper length of pipe to avoid stress on gas control manifold.

BURNER

ORIFICE

A93059
Fig. 23 - Orifice Hole	48TC**16
NOTE: If orifice hole appears damaged or it is suspected
to have been re-drilled, check orifice hole with a
numbered drill bit of correct size. Never re-drill an
orifice. A burr-free and squarely aligned orifice hole is
essential for proper flame characteristics. See Fig. 23.

Step 11 — Install External Condensate Trap and Line

The unit has one 3/4-in. condensate drain connection on the end of the condensate pan and an alternate connection on the bottom. See Fig. 24. Unit airflow configuration does not determine which drain connection to use. Either drain connection can be used with vertical or horizontal applications.

CONDENSATE PAN (SIDE VIEW)		ALTERNATE
STANDARD	DRAIN PLUG
		BOTTOM DRAIN
SIDE DRAIN
	(FACTORY-INSTALLED)

C08021

Fig. 24 - Condensate Drain Pan (Side View)

When using the standard side drain connection, ensure the red plug in the alternate bottom connection is tight. Do this before setting the unit in place. The red drain pan can be tightened with a 1/2-in. square socket drive extension.

To use the alternate bottom drain connection, remove the red drain plug from the bottom connection (use a 1/2-in. square socket drive extension) and install it in the side drain connection.

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