Blower Speed Selection; Additional Static Resistance; Indoor Blower Specifications - York AFFINITY SERIES R-410A Installation Manual

279550-YIM-A-0207
Table 15: Additional Static Resistance
Size
CFM Wet Indoor Coil
(Tons)
500
600
700
800
024
(2.0)
900
1000
1100
1200
700
800
900
1000
036
(3.0)
1100
1200
1300
1400
1100
1200
1300
1400
1500
048
(4.0)
1600
1700
1800
1900
2000
1. The pressure drop through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance
of the return air duct is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.
Table 16: Indoor Blower Specifications
Size
(Tons) HP RPM
024
1/2 Variable
(2.0)
036
1 Variable
(3.0)
048
1 Variable
(4.0)

Blower Speed Selection

The variable speed blowers are designed to deliver constant
CFM regardless of the external static pressure (ESP) in the
ductwork. Therefore, if too many supply registers are closed, a
filter becomes clogged, or there is a restriction in the ductwork,
the motor will automatically operate at a higher speed to
compensate for the higher ESP. This may result in a higher
operating sound level.
These units have variable speed motors that automatically
adjust to provide constant CFM from 0.2" to 0.6" w.c. static
pressure. From 0.6" to 1.0" static pressure, CFM is reduced by
2% per 0.1" increase in static. Operation on duct systems with
greater than 1.0" w.c. external static pressure is not
recommended.
Unitary Products Group
Economizer
0.01 0.00
0.01 0.00
0.01 0.00
0.02 0.01
0.03 0.01
0.04 0.01
0.05 0.01
0.06 0.02
0.01 0.00
0.02 0.01
0.03 0.01
0.04 0.01
0.05 0.01
0.06 0.02
0.07 0.03
0.08 0.04
0.02 0.02
0.03 0.02
0.04 0.02
0.05 0.03
0.06 0.04
0.07 0.04
0.07 0.04
0.08 0.04
0.09 0.05
0.09 0.05
Motor
Eff. SF Frame
0.8 1.0 48
0.8 1.0 48
0.8 1.0 48
1
Filter/Frame Kit
0.01
0.02
0.04
0.06
0.08
0.10
0.13
0.16
0.04
0.06
0.08
0.10
0.13
0.16
0.17
0.18
0.04
0.04
0.05
0.05
0.06
0.07
0.08
0.09
0.10
0.11
To Set Cooling CFM for DNX Units:
Refer to Airflow Performance Tables 13 and 14 for the possible
cooling speed CFM selections.
Set "COOL" and "ADJ" Jumpers on the CFM selection board as
indicated in Tables 13, 14 and Figure 14.
NOTE: CFM indicator light flashes once for every 100 CFM
(i.e. 12 flashes = 1200 CFM).
Do not change the "ADJ" tab position on the CFM
selection board as this will change your cooling CFM
previously selected.
To Set Delay Profile:
Every unit has multiple cooling "blower off delay" profiles to
optimize system performance and efficiency. Refer to Table 17
for the regional climate in your area. Place the "DELAY" jumper
tap on the CFM selection board on the appropriate pin setting.
Factory Set Gas Heat CFM:
The blower speed required for gas heat is different than for
cooling. The heating CFM is factory set, but is adjustable.
Electric Heat
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