Burner Air Shutter Adjustment; Checking Supply Air Cfm; Blower Motor Pulley Adjustment; Typical Flame Appearance - York SUNLINE PLUS D1EG090 Installation Instruction

530.22-N4Y

BURNER AIR SHUTTER ADJUSTMENT

Adjust burner shutters so no yellow flame is observed in the
heat exchanger tubes. Refer to Figure 14.
FIG. 14 - TYPICAL FLAME APPEARANCE

CHECKING SUPPLY AIR CFM

The RPM of the supply air blower will depend on the required CFM,
the unit accessories and the static resistances of both the supply
and the return air duct systems. With this information, the RPM for
the supply air blower can be determined from the blower
performance data in Table 5.
Knowing the required blower RPM and the blower motor HP,
the setting (turns open) for the supply air motor pulley can be
determined from Table 10.
Start the supply air blower motor. Adjust the resistances in both
the supply and the return air duct systems to balance the air
TABLE 10 - SUPPLY AIR BLOWER MOTOR PULLEY
ADJUSTMENT
BLOWER DRIVE RANGE (RPM)
TURNS DEG090
OPEN*
1-1/2 &
2HP
2HP
5 975
4 1024
3 1073
2 1122
1 1171
0 1220
*Pulleys can be adjusted in half-turn increments.
distribution throughout the conditioned space. The job
specifications may require that this balancing be done by
someone other than the equipment installer.
To check the supply air CFM after the initial balancing has been
completed:
1. Remove the dot plugs from the filter access and blower
access panels as shown in Figure 10.
14
DEG120 DEG150
3HP 3HP
860
906
952
998
1044
1090
2. Insert at least 8" of 1/4 inch tubing into each of these holes
for sufficient penetration into the air flow on both sides of
the evaporator (or indoor) coil.
NOTE: The tubes must be inserted and held in a position
perpendicular to the air flow so that velocity pres-
sure will not affect the static pressure readings.
3. Using an inclined manometer, determine the pressure drop
across a dry indoor coil. Since the moisture on an indoor
coil may vary greatly, measuring the pressure drop across
a wet coil under field conditions would be inaccurate. To
assure a dry coil, the compressors should be deactivated
while the test is being run.
4. Knowing the pressure drop across a dry coil, the actual
CFM through the unit can be determined from the curve in
Figure 15.
WARNING: Failure to properly adjust the total system air quan-
tity can result in extensive blower damage.
After readings have been obtained, remove the tubes and seal
up the drilled holes in the side panels. 5/16" dot plugs (P/N
029-13880) are available through normal parts ordering
procedures.
NOTE: DE-ENERGIZE THE COMPRESSORS BEFORE TAKING ANY TEST
MEASUREMENTS TO ASSURE A DRY INDOOR COIL.
5HP
960
996
1032
1068
1104
1140
FIG. 15 - PRESSURE DROP ACROSS A DRY INDOOR
COIL VS SUPPLY AIR CFM
Unitary Products Group