Carrier 58ZAV operating instructions ÐAltitude Derate Multiplier for U.S.A

→Table 7ÐModel 58ZAV Orifice Size² and Manifold Pressure for Correct Input (Continued)

(Tabulated Data Based on 23,000 BTUH Per Burner, Derated 4 percent per 1000 Ft Above Sea Level)*

	ALTITUDE		AVG GAS						SPECIFIC GRAVITY OF NATURAL GAS
			HEAT VALUE		0.58			0.60			0.62			0.64			0.66
		RANGE
		(FT)	AT ALTITUDE	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold	Orifice		Manifold
			(BTU/CU FT)
				No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure	No.		Pressure
			575	43		3.0	43		3.1	43		3.2	43		3.3	43		3.4
			600	43		2.7	43		2.8	43		2.9	43		3.0	43		3.1
Only		9001	625	43		2.5	43		2.6	43		2.7	43		2.8	43		2.8
			650	43		2.3	43		2.4	43		2.5	43		2.6	43		2.6
U.S.A.		to	675	43		2.1	43		2.2	43		2.3	43		2.4	43		2.4
			700	48		3.8	43		2.1	43		2.1	43		2.2	43		2.3
		10,000	725	48		3.5	48		3.6	48		3.7	43		2.1	43		2.1
			750	49		3.8	48		3.4	48		3.5	48		3.6	48		3.7
			775	49		3.6	49		3.7	49		3.8	48		3.4	48		3.5

*For size 135-20 only, input is 22,500 Btuh per burner. Deduct 0.1-in. wc from manifold pressure shown in table. Change orifice size if manifold pressure falls below 3.2-in. wc on altitudes up to 2000 ft, otherwise change orifice size if manifold pressure falls below 2.0-in. wc.

² Orifice sizes shown in BOLD are factory installed.

NOTE: If orifice hole appears damaged or it is suspected to have been redrilled, check orifice hole with a numbered drill bit of correct size. Never redrill an orifice. A burr-free and squarely aligned orifice hole is essential for proper flame characteristics.

Table 8ÐAltitude Derate Multiplier for U.S.A.

ALTITUDE	% OF	DERATE MULTIPLIER
(FT)	DERATE	FACTOR FOR U.S.A*
0Ð2000	0	1.00
2001Ð3000	8Ð12	0.90
3001Ð4000	12Ð16	0.86
4001Ð5000	16Ð20	0.82
5001Ð6000	20Ð24	0.78
6001Ð7000	24Ð28	0.74
7001Ð8000	28Ð32	0.70
8001Ð9000	32Ð36	0.66
9001Ð10,000	36Ð40	0.62

* Derate multiplier factor is based on midpoint altitude for altitude range.

BURNER

ORIFICE

A93059

DO NOT redrill orifices. Improper drilling (burrs, out-of- round holes, etc.) can cause excessive burner noise and misdirection of burner flames. This can result in flame impingement of burners and heat exchangers, causing failures.

(3.) After correct manifold pressure is obtained, replace gas valve regulator adjustment screw cap and verify adjusted gas input rate using method outlined in item c.

(4.) Burner flame should be clear blue, almost transparent. (See Fig. 19.)

c. Verify natural gas input rate by clocking gas meter.

NOTE: High-Altitude Adjustment

United States

At installation altitudes above 2000 ft, this furnace has been approved for a 4 percent derate for each 1000 ft above sea level. See Table 8 for derate multiplier factor.

EXAMPLE:

92,000 Btuh input furnace installed at 4300 ft.

Furnace Input		Derate		Furnace Input Rate
Rate at	X	Multiplier	=	at Installation
Sea Level		Factor		Altitude
92,000		0.82		75,440

Canada

At installation altitudes from 2000 to 4500 ft, this furnace must be derated 10 percent by an authorized Gas Conversion Station. To determine correct input rate for altitude, see example above and use 0.90 as derate multiplier factor.

a.Turn off all other gas appliances and pilots.

b.Start furnace and let operate for 3 minutes.

c.Measure time (in sec) for gas meter test dial to complete 1 revolution.

d.Refer to Table 9 for cu ft of gas per hr.

e.Multiply gas rate (cu ft/hr) X heating value (Btu/cu ft) using natural gas heating value from local gas utility/supplier.

18