Carrier 48XL Fire and Unit Damage Hazard, U.S.A, Canada, Example, 5001-6000

CARBONMONOXIDEPOISONINGHAZARD

Failureto follow this warning could result in personal iniury and/or death.

If the manifold pressure and/or gas rate is not properly

adjusted on HI and LO stages, excess carbon monoxide can be produced.

FIRE AND UNIT DAMAGE HAZARD

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

Unsafe operation of the unit may result if manifold pressure is outside of the ranges listed in Table 6.

Gas input rates on rating plate are for installations at altitudes up to 2000 ft (610 m). Input rate must be within - 2% of rating plate input.

1.Determine the correct gas input rate.

a.The rated gas inputs shown in Table 4 are for altitudes from sea level to 2000 ft (610 m) above sea level. These inputs are based on natural gas with a heating value of 1050 Btu/ft3 at .65 specific gravity.

IN THE U.S.A.:

The input rating for altitudes above 2,000 ft (610 m) must be reduced by 4 percent for each 1,000 ft (305 m) above sea level.

For installations below 2,000 ft, (610 m) refer to the unit rating plate.

For installations above 2,000 ft, (610 m) multiply the input by on

the rating plate by the derate multiplier in Table 6 for the correct input rate.

Table 5 - Altitude Derate Multiplier for U.S.A.

Altitude ft (m)	Percent of Derate	Derate Multiplier
		Factor*
0-2000
(0-610)	0	1.00
2001-3000
(610-914)	8-12	0.90
3001-4000
(915-1219)	12-16	0.86
4001-5000
(1220-1524)	16-20	0.82
5001-6000
(1524-1829)	20-24	0.78
6001-7000
(1829-2134)	24-28	0.74
7001-8000
(2134-2436)	28-32	0.70
8001-9000
(2139-2743)	32-36	0.66

9001-10,00036-400.62

(2744-3048)

:'Derate multiplier factors are based on midpoint altitude for altitude range,

IN CANADA:

The input rating for altitudes from 2,000 (610 m) to 4,500 ft (1372

m)above sea level must be derated 10 percent by an authorized

Gas Conversion Station or Dealer.

EXAMPLE:

90,000 Btuh Input Furnace Installed at 4300 ft (1372 m).

Furnace Input Rate		Derate Multiplier	Furnace	Input Rate
at Sea Level	X	Factor	at Installation
Altitude
90,000	X	0.90	=	81,000

b. When the gas supply being used has a different heating value or specific gravity, refer to national and local codes, or contact your distributor to determine the required orifice size.

2.Adjust manifold pressure to obtain low stage input rate (See Fig. 19).

a.Turn off gas supply to unit.

b.Remove pipe plug on manifold (See Fig. 20) and

connect manometer. Turn on gas supply to unit.

c.Turn gas valve switch to ON.

d. Set unit to run for 20 minutes in low-stage gas heat

operation using the "INSTALLER CHECKOUT" menu on the User Interface.

e. Remove regulator adjustment cap from low stage gas valve pressure regulator (See Fig. 19) and turn

low-stage adjusting screw (3/16 or smaller flat-tipped

screwdriver) counterclockwise (out) to decrease rate and

clockwise (in) to increase input rate.

1/2" NPT iNLET

1/2' NPT OUTLET J _ PDAE_'/FOLDE TAP

A04167

Fig. 19 - Redundant Automatic Gas Control Valve

NOTE: DO NOT set low stage manifold pressure less than 1.4 IN. W.C. or more than 2.0 IN. W.C. for natural gas. If manifold pressure is outside this range, change main burner orifices.

f. Re-install low stage regulator adjustment cap.

g. Leave manometer connected.

NOTE: If orifice hole appears damaged or it is suspected to have

been re-drilled, check orifice hole with a numbered drill bit of the

correct size. Never re-drill an orifice. A burr-free and squarely aligned orifice hole is essential for proper flame characteristics.

3.Verify natural gas low stage input rate.

a.Turn off all other gas appliances and pilots served by the gas meter.

b.If unit is not running, set unit to run for 20 minutes in

low-stage gas heat operation using the "INSTALLER

CHECKOUT" menu on the UI.

c.Record number of seconds for gas meter to complete one revolution.

d.

Divide

number

of

seconds

in step c. into

3600

(number

of seconds in 1 hour).

e. Multiply result of step d. by the number of cubic feet

shown

for

one

revolution

of test dial

to

obtain

cubic

feet

of gas flow per hour.

f. Multiply result of step f. by Btu heating value of the gas

to obtain total measured input shown in Table 4.

(Consult the local gas supplier if the heating value of

gas is not known).

EXAMPLE:

Assume

a 90,000

high

stage

input

unit

is

being

installed.

Assume

that

the

size

of

the

dial

is

2

cubic

ft., one

revolution

takes 129 sec., and the

heating

value

of

the

gas

is

1050

Btu/ft3.

Proceed

as follows:

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