Figure 2.11 Fan Blade Setting; Figure 2.12 Dirty Filter Switch; Manual 2100-620A - Bard D36A2P/BLD.10304 Installation And Service Instructions Manual

change of motor or fan blade be necessary, please view
Figure 2.11 for proper clearance adjustment.
DIRTY FILTER SWITCH
Located inside the blower compartment, this switch
measures air pressure differential across the filter (see
Figure 2.12). Manual reset only. Default setting: 0.8"
static, 50% blocked filter (approximately).
INDOOR BLOWER MOTOR
Unlike most other system fan motors, this motor is a
48VDC motor, and is very specialized in application.
Please see Table 2.6 (blower table).
PHOENIX ISOLATION RELAY:
WALL-MOUNT UNIT
Green DIN-Rail mount isolation relay used in the wall-
mount unit to isolate/filter 48VDC power, motor speed
signal and ground from the PLC board: Phoenix Mini
MCR-Style.
ZETTLER ISOLATION RELAYS:
WALL-MOUNT UNIT
Black Zettler surface mount relays used in the wall-
mount unit to isolate the start signal from:
• Power loss relay circuit (see Figure 2.13 on page
60)
• High pressure relay circuit (see Figure 2.14 on
page 60)
• Blower motor start signal relay circuit (see Figure
2.15 on page 60)
ISOLATION RELAYS: LC-CONTROLLER
Blue DIN-Rail mount isolation relays used in the
controller to isolate the PLC board from varying
voltages within the same shelter.
RATED
MODEL
ESP
D36A/D36L 0.15
D42A/D42L 0.20
D48A/D48L 0.20
D60A/D60L 0.20
PLC controller derives at this decision point and switches the indoor motor speed. The damper actuator will then

adjust to still yield a 55°F supply air temperature.
TABLE 2.6
Indoor Blower Performance
MAX FREE COOLING
ESP CFM ABOVE 40°
0.50 1800
0.50 1800
0.50 1800
0.50 1800
FIGURE 2.11
Fan Blade Setting
AIRFLOW
MIS-1724
Model
All covered by
this manual
FIGURE 2.12
Dirty Filter Switch
FREE COOLING RATED
CFM BELOW 40° FULL LOAD
COOLING CFM

800 1100
950 1250
1100 1600
1100 1600
"A"
Dimension A
1.75"
ELECTRIC
HEAT
AIRFLOW
1800
1800
1800
1800

Manual 2100-620A

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