Manual 2100-670
Page
17 of 32
Unit
Filter Blockage %
0%
10%
20%
30%
40%
50%
60%
70%
HR58APA
(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%
HR58APA
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
Dirty Filter Alarm
The wall unit is equipped with a differential pressure
switch input to the controller. When the switch
indicates a dirty filter, the controller will generate an
alarm. Once the condition is no longer present, the
alarm will automatically clear. Additionally, an indicator
light will be turned on with the alarm and turned off
when the alarm clears.
The threshold of this alarm is adjusted by changing the
settings on the switch (see Table 7).
Filter Indicator Light
These units are equipped with a 24v indicator light
mounted on side of unit that displays the current status
of the filter (see Figure 19). When the light is on, the
filter needs to be replaced. Once the filter(s) has been
changed, the indicator light will turn off.
Freezestat
These units are equipped with a switch that monitors
the temperature of the refrigerant line leaving the
evaporator coil. To prevent the coil from freezing
and potentially allowing liquid refrigerant from the
evaporator to enter the compressor, the switch will open
when the temperature at this sensor is between 26.5°F
and 37.5°F and close again when the temperature is
between 49.5°F and 64.5°F.
This switch can be verified by:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to
I/O Config
;
press ENTER key.
4. Press UP or DOWN keys to scroll to
Digital In
Config (C1)
; press ENTER key.
5. Reference
5
Freeze
row and
Val
column (see Figure
20).
6. This value will display ON when the freezestat
has tripped and OFF when the freezestat is in its
normal position.
NOTE:
This input is automatically configured by
the model number and cannot be enabled or
disabled on this screen.
FIGURE 20
Verifying Freeze Switch Status
Freezestat Alarm
When the freezestat digital input indicates a low
temperature event has occurred for longer than 120
seconds, the controller will generate a freezestat alarm.
This will then change the blower to high speed and
turn off the compressor for a minimum of 300 seconds.
The blower speed will return to normal once the alarm
condition has been removed. The compressor will start
again when the freezestat indicates no alarm and 300
seconds has passed. Once the condition is no longer
present, the alarm will automatically clear.
To adjust the freezestat alarm delay:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
USER password 2000.
3. Press UP or DOWN keys to scroll to
System Config
;
press ENTER key.
4. Press UP or DOWN keys to scroll to
Alarm Setup
(A7)
; press ENTER key.
5. Press ENTER key to scroll to
FreezeStat Alarm
Delay
(see Figure 21 on page 18).
