Carrier 58DHL - Manual (Page 7)

to the outside, or exposed to air currents from warm- or
cold-air registers; or to exposure where the natural circula­
tion of the air is cut off—such as behind doors, above or
below mantels, shelves, etc.
The thermostat should not be exposed to heat from nearby-
fireplaces, radios, televisions, lamps, or rays from the sun.
Nor should the thermostat be mounted on a wall containing
pipes or warm-air ducts, or a flue or vent that could affect
its operation emd prevent it from properly controlling the
room temperature. Any hole in the plaster or panel through
which the wires pass from the thermostat should be ade­
quately sealed -with suitable material to prevent drafts from
affecting the thermostat.
C. Blower Control Center
Each furnace features a blower control center. This will aid
the installer and serviceperson when installing and ser-vic-
ing the unit. A low-voltage terminal board is marked for
easy connection of field wiring. See Fig. 14.
XI. STARTUP AND ADJUSTMENT
In addition to the following information, refer to “Proce­
dures for Induced-Combustion Furnaces” packaged with
the unit.
NOTE:
The furnace blower door must be in place to com­
plete the 115-volt circuit to the furnace.
A CAUTION
This furnace is equipped with a fusible link(s) in the ves­
tibule area. The link(s) will melt if an overheating condi­
tion caused by an inadequate combustion-air supply or
improper venting practices develops. Do not jumper the
hnk(s). Correct the condition and replace the link(s) with
an identical part.
The gas service pressure must not exceed 0.5 psig (14 in.
wc).
NOTE:
The gas valve regulator has been factory-set at 3.5
in. wc for natural gas. Refer to “Procedure for Induced-
Combustion Furnaces” for readjusting when checking
input.
A. Adjustment of Blower Speed
A WARNING
Disconnect the electrical power before changing the
speed tap. A failure to adhere to this weirning can cause
personal injury.
To change motor speed taps, remove the motor tap lead. See
Table 6, and relocate it on the desired terminal on the plug­
in termineJ block/speed selector located on the blower.
Table 6—Speed Selector
Speed Tap No.*t
Common C
Hi 1
Med-Hi 2
Med-Low 3
Low 4
*Furnaces without a cooling fan relay are equipped with a 3-speed motor.
tWhite wire from control box to common; black wire from control box to
cooling speed selection (when used); red wire from control box to heat­
ing speed selection.
A CAUTION
When adjusting the blower speed, make certain that
the temperature rise across the heat exchanger does not
exceed that specified on the rating plate.
B. Automatic Gas Control Valve
These units are equipped with an automatic gas control
valve. If not already checked when lighting the main
burner, check the proper operation of this valve by moving
the room thermostat pointer above and below room temper­
ature and observing that the main burners fight on “call for
heat” (there will be a time delay) and go off when the pointer
is moving below room temperature setting.
NOTE:
For ease of adjusting the pilot flame, disconnect and
tape one power lead at the main gas valve. Disconnect ter­
minal No. 1. This will prevent main bxurner ignition and
allow time to adjust the pilot. Reconnect the power lead
after adjustment.
CONNECTOR
"\
A87230
Fig. 16—Redundant Automatic Gas
Contrai Valve
XII. CARE AND MAINTENANCE
A CAUTION
Because of possible damage to the equipment or per­
sonal injury, maintenance should be performed by qual­
ified persons only.
A WARNING
Never store anything on, near, or in contact -with, the
furnace, such as:
1. Spray or aerosol cans, rags, brooms, dust mops, vac­
uum cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds, plastic or plastic containers, gasoline,
kerosene, cigarette fighter fluid, dry cleaning fluids,
or other volatile fluids.
3. Paint thinners and other pednting compounds, paper
bags or other paper products. A failure to adhere to
this warning can cause a fire, physical injury, or
death.
For continuing high performance, and to minimize possible
equipment failure, it is essential that periodic maintenance
be performed on this equipment. Consult your local Dealer
as to the proper frequency of maintenance and the availabil­
ity of a maintenance contract.