Trane YCZ036F1/3M0B GAS Piping Installation, Pipe Delivery Schedule, GAS Supply Line Pressure

GAS PIPING INSTALLATION

CAUTION: Before making the gas pipe connection give seri- ous consideration to providing the required clearance neces- sary to remove the access panels on the unit (e.g., economizer and filter access panels).

NOTE: In the absence of local codes, the installation must conform with American National Standard--Z223.1--National Fuel Gas Code, Latest Revision.

The available gas supply must agree with the required gas supply marked on the unit nameplate. Minimum permissible gas supply pressure for purpose of input adjustment must be at least 7.0 in. w. c. (inches water column) for natural gas and 11 in. w. c. for LP gas.

PIPE DELIVERY SCHEDULE

NOTE: The following procedure and tables below apply to Natural Gas only.

1.Obtain from the gas company the heating value and specific gravity of the gas delivered.

2.Determine the exact length of pipe needed.

3.Read BTUH input nameplate on the furnace.

4.Use the multiplier opposite the specific gravity of the gas given in Table 1 below and insert in the following formula:

NOTE: If this is an LPG application, consult your LPG supplier for pipe sizes and deliveries.

GAS PRESSURE SETUP PRECAUTIONS

▲WARNING: NEVER USE AN OPEN FLAME

TO TEST FOR GAS LEAKS: AN EXPLOSION COULD OCCUR, CAUSING INJURY OR DEATH.

IMPORTANT: The furnace and its individual shut-off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures exceeding 1/2 psig (3.48 kPa).

The furnace must be isolated from the gas supply piping system by closing its individual manual shut-off valve during any pressure testing of the gas supply piping system at test pressures less than or equal to 1/2 psig (3.48 kPa).

GAS SUPPLY LINE PRESSURE

Before connecting the unit to the gas supply line, be sure to determine the gas pressure in the line.

If the gas supply pressure is excessive (above 14 inches water column or 1/2 psig), install a pressure regulator either at the supply source or in the branch circuit serving the unit. Once the regulator is installed, set it to provide a pressure of 7 inches water column with

CFH =

Furnace Input in BTUH

the unit operating and no greater than 14 inches water column with

Gas Heat Content in BTU/Cu. Ft. X Multiplier

TABLE 1

This will give the factor for columns 2 through 6 in Table 2.

	SPECIFIC	MULTIPIER
	GRAVITY
MULTIPIERS TO BE USED	.50	1.10
WHEN THE SPECIFIC	.55	1.04
GRAVITY OF THE GAS IS	.60	1.00
OTHER THAN 0.60	.65	.962

5. Using Table 2, select the pipe length nearest to yours.

TABLE 2

6.Follow this line vertically down to the exact CFH found in Step 4 above or the next highest value.

NATURAL GAS ONLY

TABLE OF CUBIC FEET PER HOUR OF GAS

FOR VARIOUS PIPE SIZES AND LENGTHS

PIPE			LENGTH OF PIPE (feet)
SIZE
(inch)	10	20	30	40	50	60	70
1/2	132	92	73	63	56	50	46
3/4	278	190	152	130	115	105	96
1	520	350	285	245	215	195	180
1-1/4	1050	730	590	520	440	400	370

THIS TABLE IS BASED ON PRESSURE DROP OF 0.3 INCH W.C. AND 0.6 SP.GR. GAS

7.Read horizontally to the left of this column for the required pipe size diameter.

the unit not firing.

NOTE: Gas pressure in excess of 14 inches water column (1/2 psig) may damage the regulator, while improper regulation may result at pressures lower than 5.5 inches water column at the unit inlet.

If the supply line pressure is below the minimum supply pressure indicated on the unit nameplate, contact the gas supply company.

Follow these steps to complete the installation of the unit gas piping. See Figure 14.

1.Install a tapped, Style A (1/8-inch NPT tap) shut-off gas cock at the end of the gas supply line near the unit. Be sure the tapped gas cock is downstream of the pressure regulator, if used.

r	SCHEMATIC DIAGRAM OF
	GAS PIPING TO UNIT
		DEALER INSTALLED
	1/8" N.P.T.PLUGGED	GROUND UNION
	ACCESS FOR TEST
	GAUGE CONNECTION
FROM		6"
GAS SUPPLY		MIN	TO MAIN
			CONTROL
			VALVE
	DRIP LEG
FIELD SUPPLIED MAIN		UNIT
GAS VALVE, MUST BE
INSTALLED BY DEALER
	OUTSIDE UNIT.

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