Manual 2100-694B
Page
48 of 62
8301-057 Blower Status Switch/Dirty Filter Switch
FIGURE 61
8301-057 Air Differential Switch Terminals
Terminals
1 − Normally Closed
2 − Normally Open
3 − Common
NOTE:
Contact position is in resting
state.
P2
P1
P1: Hose Connected
P2: Stub Connected
TABLE 16
8301-057 Differential Air Pressure Switch Settings
Unit
Filter Blockage %
0%
10%
20%
30%
40%
50%*
60%
70%
HR35BP*
(Default) High S/T
Switch Static Setting
0.65
0.70
0.75
0.85
0.95
1.05
1.25
1.50
Evaporator Airflow %
100%
99.0% 97.0% 96.4% 95.5% 92.7% 88.1% 80.6%
HR35BP*
Standard
Switch Static Setting
0.40
0.43
0.45
0.50
0.55
0.65
0.75
0.90
Evaporator Airflow %
100%
99.7% 98.7% 96.8% 96.0% 94.4% 91.6% 85.2%
HR36BP*
(Default) High S/T
Switch Static Setting
0.12
0.12
0.12
0.20
0.20
0.35
0.35
0.40
Evaporator Airflow %
100%
99.3% 99.4% 98.7% 96.5% 92.1% 91.3% 87.9%
HR36BP*
Standard Airflow
Switch Static Setting
0.12
0.12
0.12
0.12
0.20
0.20
0.20
0.30
Evaporator Airflow %
100%
99.3% 99.4% 98.8% 97.3% 91.5% 89.8% 88.3%
HR58BP*
(Default) High S/T
Switch Static Setting
0.40
0.50
0.60
0.70
0.75
0.80
0.90
1.00
Evaporator Airflow %
100%
98.7% 98.1% 97.5% 91.7% 81.3% 79.1% 78.6%
HR58BP*
Standard Airflow
Switch Static Setting
0.30
0.35
0.40
0.45
0.50
0.65
0.70
0.90
Evaporator Airflow %
100%
99.8%
99%
98.5% 96.8% 89.9%
84%
82.2%
* Bard recommends filter switch be set at 50% filter blockage or less. Higher settings may significantly hinder unit
performance.
