Carrier 58DRC - Manual (Page 6)

HEATING A COOLING
58DRC
Counterflow Gas-Fired Furnaces
START-UP AND ADJUSTMENT
In addition to the following information, refer to
Procedures for Gas-Fired Furnaces packaged with the
unit.
NOTE: There is a switch located in the blower compart­
ment that breaks the electrical power supply when the
blower access door is removed. Be sure blower access
door is properly installed.
A CAUTION
This furnace is equipped with a fusible link in the
vestibule area that will melt if an overheating condi­
tion caused by an inadequate combustion air supply
or improper venting practices develops. Do not
jumper this fuse. Correct the condition and replace
the fuse with an identical part.
The gas service pressure must not exceed 14 in. wg
(8.1 oz) for natural gas, or 11 in. wg (6.3 oz) for LP
(propane) gas.
NOTE; The gas valve regulator has been factory-set at
3 5 in. wg for natural gas and 10.5 in. wgfor LP (propane)
gas. Refer to Procedures for Gas-Fired Furnaces when
checking input.
Adjustment of Blower Speed
A WARNING
Disconnect the electrical power before changing the
speed tap.
To change motor speed taps, remove the motor tap
lead (see Table 5) and relocate it on the desired terminal
on the plug-in terminal block/speed selector located on
the blower.
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.
Table 5 — Speed Selector
SPEED COLOR TAP NO.
Common White C
Hi Black 1
Med-Hi Yellow 2
Med-Low Blue 3
Low Red 4
Automatic Gas Control Valve — These units are
equipped with an automatic gas control valve. See
Fig. 13. 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 temperature and observing that the main burners
light on call for heat and go off when the pointer is moved
below room temperature setting.
REGULATOR
ADJUSTMENT MANUAL
ON-OFF
DIAL
, ~ . ^ PILOT
■ ADJUSTMENT
PILOT
TUBE
CONNECTION
Fig. 13 — Redundant Automatic Gas Control
Valve — BDP Model 646
NOTE: For ease of adjusting the pilot flame, disconnect
one power lead at main gas valve. For Model 646 gas
valve, disconnect terminal no. 1. This will prevent main
burner ignition and allow time to adjust the pilot. Re­
connect the power lead after adjustment.
CARE AND MAINTENANCE
A CAUTION
Because of possible damage to the equipment or per­
sonal injury, maintenance should be performed by
qualified service agency.
A WARNING
Never store anything on, or in contact with, the
furnace, such as
1 Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds, plastic or plastic containers, gas­
oline, kerosene, cigarette lighter fluid, dry clean­
ing fluids, or other volatile fluids.
3, Paint thinners and other painting compounds,
paper bags or other paper products
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 mainte­
nance and the availability of a maintenance contract
The ability to properly perform maintenance on this
equipment requires certain mechanical skills and tools.
If you do not possess these, contact your dealer for
maintenance.
A WARNING
Turn off gas and electrical supplies to unit before
performing any maintenance or service on unit.
Follow relighting instructions on plate attached to
furnace
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Bookll [4 PC101 Catalog No 535-843 Printed in U S A Form58DRC-1SI Pg6 7-85 ReplacesiNew
For replacement items use Carrier .Specified Parts
Tab l6al8a