Bard D36A2P/BLD.10304, Installation And Service Instructions Manual

Page: 59 / 107

Manual 2100-620A
Page 59 of 107
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.
Model Dimension A
All covered by
this manual
1.75"
FIGURE 2.11
Fan Blade Setting
"A"
AIRFLOW
MIS-1724
TABLE 2.6
Indoor Blower Performance
MODEL
RATED
ESP
MAX
ESP
FREE COOLING
CFM ABOVE 40°
FREE COOLING
CFM BELOW 40°

RATED
FULL LOAD
COOLING CFM
ELECTRIC
HEAT
AIRFLOW
D36A/D36L 0.15 0.50 1800 800 1100 1800
D42A/D42L 0.20 0.50 1800 950 1250 1800
D48A/D48L 0.20 0.50 1800 1100 1600 1800
D60A/D60L 0.20 0.50 1800 1100 1600 1800

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.
FIGURE 2.12
Dirty Filter Switch