Manual 2100-670B
Page
17 of 33
AIRSTREAM BEFORE FILTER
TUBE LOCATED IN
COVER
REMOVE COVER
SCREW TO
TUBE LOCATED IN
AIRSTREAM AFTER FILTER
MIS-3901
ADJUSTMENT
INDICATOR ARROW
ADJUSTMENT
KNOB
FILTER
LIGHT
FIGURE 20
Dirty Filter Switch and Filter Indicator Light
MIS-3901
Unit
Filter Blockage %
0%
10%
20%
30%
40%
50%
60%
70%
HR36AP*
(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%
HR36AP*
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%
HR58AP*
(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%
HR58AP*
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%
All units tested equipped with MERV 8 filters. Appropriate supply (SG) and return (RG) grilles installed during testing. Pressure
switch adjustment may be necessary due to variations in filter type, installation and room pressure.
Bard recommends the filter switch be set at 50% filter blockage or less. Higher settings may significantly hinder unit
performance.
TABLE 7
Filter Switch Pressure Settings
