Carrier 58CTA/CTX User Manual download pdf (Page 29)

2. Adjust the gas input rate per the installation instructions.

Low gas input rate causes low vent gas temperatures, caus-

ing condensation and corrosion in the furnace and/or vent-

ing system. Derating is permitted only for altitudes above

2000 ft

3. Adjust the air temperature rise to the midpoint of the rise

range or slightly above. Low air temperature rise can cause

low vent gas temperature and potential for condensation

problems.

4. Set the thermostat heat anticipator or cycle rate to reduce

short cycling.

Air for combustion must not be contaminated by halogen

compounds which include chlorides, fluorides, bromides, and

iodides. These compounds are found in many common home

products such as detergent, paint, glue, aerosol spray, bleach,

cleaning solvent, salt, and air freshener, and can cause corrosion

of furnaces and vents. Avoid using such products in the

combustion--air supply. Furnace use during construction of the

building could cause the furnace to be exposed to halogen

compounds, causing premature failure of the furnace or venting

system due to corrosion.

Vent dampers on any appliance connected to the common vent

can cause condensation and corrosion in the venting system. Do

not use vent dampers on appliances common vented with this

furnace.

ADDITIONAL VENTING REQUIREMENTS

A 4 in. (102 mm) round vent elbow is supplied with the furnace.

A 5 in. or 6 in. (127 or 152 mm) vent connector may be required

for some model furnaces. A field--supplied 4 in. to 5 in. (102 to

127 mm) or 4 in. to 6 in. (102 mm to 152 mm) sheet metal

increaser fitting is required when 5 in. or 6 in. (127 or 152 mm)

vent connector is used. See Fig. 35--47 Venting Orientation for

approved vent configurations.

See Venting Notes after Fig. 47.

SEE NOTES: 1,2,4,7,8,9

on the page following

these figures

A03208

Fig. 35 -- Upflow Application--Vent Elbow Up

SEE NOTES: 1,2,3,4,7,8,9

on the pages following

these figures

A03209

Fig. 36 -- Upflow Application--Vent Elbow Right

58CT

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Carrier 58CTA/CTX User Manual Page 29

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