Carrier 58HDV Natural Gas Input Rating Check, Main Burner Flame Check, Temperature Rise Check

1.With gas OFF, connect manometer to manifold pressure tap on the outlet of gas control valve. See Fig. 51Use a manometer with a 0 to 12 inches of water column range.

2.Turn gas ON. Operate the furnace on High Heat by using a jumper wire on the R to W1 & W2 thermostat connections on the furnace control board.

3.Remove manifold pressure adjustment screw cover on

furnace gas control valve. Turn adjusting screw counterclockwise to decrease the manifold pressure and clockwise to increase pressure. See Fig. 51

NOTE: Adjustment screw cover MUST be replaced on gas control valve before reading manifold pressure and operating furnace.

Regulator

Adjustment

Under Cap

	HONEYWELL
	HI
	LO
	ON
INLET	OFF
Pressure	OUTLET
Tap -- 1/8
	Pressure
25--24--98a	Tap -- 1/8

A07792

Fig. 51 - Typical Gas Control Valve (Honeywell)

4.Set manifold pressure to value shown in Table 7,or Table 8.

5.Operate the furnace on Low Heat by using a jumper wire on the R to W1 thermostat connections on the furnace control board.

NOTE: The SW1 DIP switch #3 should be in the ON position to set the Low Heat manifold pressure. (See wiring diagram.)

6.Repeat steps 3 and 4 for Low Heat operation.

7.When the manifold pressures are properly set, replace the adjustment screw covers on the gas control valve.

8.Remove the jumper wires from the thermostat connections on the furnace control board. Remove manometer connection from manifold pressure tap, and replace plug in gas valve.

9.Return SW1 DIP switch #3 to previous setting.

10.Check for leaks at plug.

Natural Gas Input Rating Check

NOTE: The gas meter can be used to measure input to furnace. Rating is based on a natural gas BTU content of 1,000 BTU’s per cubic foot. Check with gas supplier for actual BTU content.

1.Turn OFF gas supply to all appliances and start furnace. Use jumper wire on R to W1 and W2 for High Heat.

2.Time how many seconds it takes the smallest dial on the gas meter to make one complete revolution. Refer to Example.

3.Repeat steps 1 and 2 with jumper wire on R to W1 for Low Heat.

NOTE: If meter uses a 2 cubic foot dial, divide results (seconds) by two.

NOTE: SW1 DIP switch #3 must be in ON position. (See Furnace Wiring Diagram). Return SW1 DIP switch #3 to previous setting after check.

Example (BTUH)

Natural Gas	No. of	Time Per	BTU Per
BTU Content	Seconds	Cubic Foot in
			Hour
per cu. foot	Per Hour	Seconds
1,000	3,600	48	75,000
	1,000 x 3,600 ÷ 48 = 75,000 BTUH

To Determine the appliance kW input rate from a .05m3 test dial that has been clocked at 80 seconds for one complete revolution.

	Example (kW)
Number of	Number of	Size of test
	seconds per		kW m3/h
seconds per		dial
	complete
hour		(.05m3)
	rotation
3,600	80	.05	2.25
	3,600 ÷ 80 x .05	= 7.2 m3/h
2.25m3/h x 10.35 kWh/m3 = 23.28 kW				58HDV
	23.28 x 3.412 = 79,431 BTU
4. Remove jumper wire from R to W1 and W2.
5. Relight all appliances and ensure all pilots are operating.

Main Burner Flame Check

Allow the furnace to run approximately 10 minutes then inspect the main burner and pilot flames. See Fig. 52.

Check for the following (Fig. 52:

•Stable and blue flames. Dust may cause orange tips or wisps of yellow, but flames MUST NOT have solid, yellow tips.

•Flames extending directly from burner into heat ex- changer.

•Flames do NOT touch sides of heat exchanger.

If any problems with main burner flames are noted, it may be necessary to adjust gas pressures, or check for drafts.

Burner Face

A07734

Fig. 52 - Main Burner

NOTE: For Igniter location see Fig. 53.

			21/16(52.4)
5/	16	(8)	1/	4	(6.4)

A07735

Fig. 53 - Igniter Location

Temperature Rise Check

The blower speed MUST be set to give the correct air temperature rise through the furnace as marked on the rating plate for both High Heat and Low Heat operation. Temperature rise is the difference between supply and return air temperatures.

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