Carrier 58PB - INPUT (1000 Btuh)

HEATING & COOLING
58ED,PB
Horizontal Gas-Fired Furnaces
LOCATION OF SHUTTER
LOCKING SCREW
SHUTTER ADJUSTING TAB
NOTE: LOOSEN LOCKING SCREW BEFORE
ADJUSTING SHUTTER. RETIGHTEN SCREW
AFTER FINAL ADJUSTMENTS ARE MADE.
Fig. 14 — Air Shutter Adjustment
Manifold Pressure Adjustment — For natural
gas, best results are obtained with a manifold pressure of
3.0 in. to 3.5 in. wg. Remove pressure tap pipe plug from
the gas valve and connect to a water manometer. Measure
gas pressure with the furnace on.
Turn regulator adjusting screw in to increase pressure,
or out to decrease pressure.
For LP gases, a 10 in. wg pressure is required. Input
rate must be maintained at ± 2%.
Fan Adjustment Check — This furnace is equipped
with a 3-speed direct drive motor to deliver a temperature
rise within the range specified on the rating plate, between
the return and supply plenums at the external duct static
pressure noted on the AGA rating plate. Consult the
wiring diagram for speed changes on the direct drive
motor. Adjust fan speed so that temperature rise is within
rating plate specifications.
Fan and Limit Control Check — After the furnace
has been operating for at least 15 minutes, restrict the
return air supply by blocking the filters or closing the
return air registers and allow the furnace to shut down on
high limit. The fan must continue to run. Remove the
restriction and the burner should come on in a few
minutes.
The operational checkout is now complete. Be sure to
adjust the thermostat to the desired setting and inform
the owner how to operate the furnace system before
leaving the jobsite.
Stopping the Furnace — Follow these procedures to
shut down the furnace for the summer, if required.
1. Disconnect electrical power to all accessories.
2. To shut down main burner, turn gas cock dial clock¬
wise to OFF position
3. (Standing pilot models only): To shut down both
pilot and main burner, depress dial and turn clockwise
to OFF position
4. Turn off all electrical power to furnace.
5. Turn off water supply to humidifier, if so equipped.
SERVICE AND MAINTENANCE
A CAUTION
The ability to properly perform maintenance on this
equipment requires certain mechanical skills and
tools. If you are at all uncertain, contact your Carrier
dealer for qualified maintenance and service.
A WARNING
Turn off all gas and electrical power to furnace
before performing any maintenance or service on
unit. Failure to take this precaution may result in
personal injury due to electrical shock or uncon¬
trolled gas leakage.
NOTE: Furnace is equipped with a blower door switch
which cuts electric power when blower door is removed.
Air Filter — In order to acquaint the user of the furnace
with proper procedure for inspecting and cleaning the
filter, the installer should instruct the user to locate,
remove, clean and replace the furnace filter(s).
NOTE: If furnace is equipped with accessory filter rack,
refer to section on page 11.
A CAUTION
Personal injury or property damage may result if
furnace is operated with the blower compartment
door removed. A lack of adequate combustion air
may cause the main burner flame to be drawn out of
the furnace unless blower compartment door is
secured.
After inspecting or replacing the filter, be sure that
the blower compartment door is securely fastened in
place. Never operate the furnace without a filter.
Lubricating Motors — Direct drive motor and
blower assemblies are factory lubricated and normally
do not require oiling.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Bookl 1 1 4 PC 101 Catalog No 535-834 Printed in U S A Form 58ED.PB-1SI Pg 15 6-85 Replaces: 58PB-1SI
Tab l6a 18a For replacement items use Carrier Specified Parts