Trane UX1C100A9361A, UX1C100A9481A, UX1C080A9601A manual Orifice Sizes, Combustion and Input Check

Installer’s Guide

T AUTOMATIC GAS VALVE	MAIN MANUAL	GROUND UNION JOINT
	SHUTOFF VALVE
WITH MANUAL SHUTOFF
			DRIP
			LEG

MAIN MANUAL

SHUTOFF VALVE

GROUND	DRIP
UNION JOINT	LEG	AUTOMATIC GAS VALVE
		WITH MANUAL SHUTOFF

HORIZONTAL FURNACE GAS PIPING MAY BE FROM EITHER SIDE (UPFLOW SHOWN)

TABLE 13

NATURAL GAS ONLY

TABLE OF CUBIC FEET PER HOUR OF GAS

FOR VARIOUS PIPE SIZES AND LENGTHS

PIPE			LENGTH OF PIPE
SIZE	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

TABLE 14

ORIFICE SIZES

INPUT	NUMBER	MAIN BURNER ORIFICE
RATING	OF	DRILL SIZE
BTUH	BURNERS	NAT. GAS	LP GAS
40,000	2	45	56
60,000	3	45	56
80,000	4	45	56
100,000	5	45	56
120,000	6	45	56

COMBUSTION AND INPUT CHECK

1.Make sure all gas appliances are off except the fur- nace.

2.Clock the gas meter with the furnace operating (de- termine the dial rating of the meter) for one revolu- tion.

3.Match the “Sec” column in the gas flow (in cfh) Table 16 with the time clocked.

4.Read the “Flow” column opposite the number of sec- onds clocked.

5.Use the following factors if necessary: For 1 Cu. Ft. Dial Gas Flow CFH =

Chart Flow Reading ÷2

For 1/2 Cu Ft. Dial Gas Flow CFH =

Chart Flow Reading ÷4

For 5 Cu. Ft. Dial Gas Flow CFH =

10X Chart Flow Reading ÷4

6.Multiply the final figure by the heating value of the gas obtained from the utility company and compare to the nameplate rating. This must not exceed the nameplate rating.

7.Changes can be made by adjusting the manifold pressure or changing orifices (orifice change may not always be required). To adjust the manifold pressure:

a. Turn off all electrical power to the system. b.Attach a manifold pressure gauge to the outlet

pressure tap marked "OUT PRESS TAP" on White-Rodgers gas valve model 36F or boss marked "OUT P" on White-Rodgers gas valve model 36G. (See Figure 58 for White-Rodgers gas valve model 36F and Figure 59 for White-Rodgers gas valve model 36G). For the gas valve model 36F, measurement requires removal of the plug and installation of a barbed fitting. Attach flexible tubing and a manometer to the barbed fitting. For the gas valve model 36G, do not remove the pressure tap test screw. Using a 3/32" hex wrench, loosen the pressure tap test screw one turn and install 5/16" flexible tubing and a ma- nometer directly onto the outlet pressure boss.

c. Turn on system power and energize valve. d.Remove the regulator adjustment screw cap on

the gas valve for manifold pressure adjustment. e.Turn the adjustment nut clockwise to increase the gas flow rate, and counterclockwise to de- crease the gas flow rate using a 3/32" hex wench.

f. The final manifold pressure setting shall be as specified in Table 15 with an input of no more than nameplate rating and no less than 93% of the nameplate rating, unless the unit is derated for high altitude.

g. Replace the regulator adjustment screw cap and tighten securely.

32 18-CD19D6-32