Carrier Bryant Payne day and night 585A/YAC - Heating System Startup and Tuning; Gas Input and Burner Settings

SINGLE-STAGE HEAT a COOL-MANUAL CHANGEOVER
-- FIELD LOW-VOLTAGE WIRING
——— FIELD HIGH-VOLTAGE WIRING
- FACTORY LOW-VOLTAGE WIRING A76313
—— FACTORY HIGH-VOLTAGE WIRING
Figure 11 —High- & Low-Voltage Connections
230-V OPERATION
BRNt
YELfe
redL
BLK^
ORN^
4
3
2
1
C
MOTOR
LEADS
molex
PLUG
CONNECTOR
208-V OPERATION
A
BRNt:
4
3
2
R1 Kf-
1
C
\
MOTOR
LEADS
A76314
MOLEX
PLUG
CONNECTOR
Figure 1 2 —Evaporator Motor Molex Plug
Connections for 018050-Size Unit
3. Make certain gas supply has been purged and all gas
piping checked.
WARNING: Do not purge into the combustion chamber. Do
not use a match or other open flame to check for leakage.
4. Check to be sure all wiring connections, including facto¬
ry connections, have been completed and are tight.
5. Inspect all supply ducts and grilles to be sure they are
adjusted properly.
6. Check to be sure air filters are in place.
Vll. HEATING STARTUP AND ADJUSTMENTS
CAUTION: Complete the steps in Section VI before starting
unit.
CAUTION: Do not jumper any safety devices when operat¬
ing unit.
Follow the instructions on the unit rating plate for starting
the heating section.
NOTE: On all 3-phase units, make certain blower rotates in
same direction as shown on arrow rotation label attached to
blower. If blower rotates in opposite direction, reverse any
two blower motor leads or any two line-voltage leads for cor¬
rect rotation.
A. Adjusting Gas Input (Natural Gas Furnace)
The gas input should agree with that shown on the unit rat¬
ing plate. The burners are equipped with fixed orifices.
NOTE: The rating shown on the rating plate is for altitudes
up to 2000 feet above sea level. For elevations above 2000
feet, reduce ratings 4% for each 1000 feet above sea level.
The main burner orifices must be changed to a smaller size.
One of the two following methods may be used to adjust the
input on a natural gas unit.
1. Measuring Gas Flow at Meter
All other gas appliances must be turned off when measuring
gas flow at meter to check the input. Proceed as follows:
a. Determine number of seconds for gas meter test dial to
make one revolution.
b. Divide 3600 by number of seconds in step a,
c. Multiply result of Step b by the number of cubic feet
shown for one revolution of test dial. This gives cubic
feet of gas flow per hour.
d. Multiply result to Step c by Btu heating value of gas.
Consult local utility for heating value of gas.
This is the total measured input in Btuh. Compare this value
with input rating shown on the unit rating plate.
Example: Suppose the size of test dial is 1 cubic foot; it
takes 30 seconds to complete one revolution; heating value
of gas 1050 Btu per cubic foot. Proceed as follows:
a. 30 seconds to complete one revolution.
b. 3600 divided by 30 equals 120.
c. 120 times 1 equals 120 cubic feet of gas flow per hour.
d. 120 times 1050 equals 126,000-Btuh input.
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