Adjusting Heating Staging; Dehumidification; Electronic Expansion Valve (Eev); Eev Components - Bard FUSION-TEC WR36BPA Service Instructions Manual

7. Press ENTER key to save value and move cursor to
Stage 1 Off Differential.
8. Press UP or DOWN keys to adjust number of
degrees below setpoint to turn cooling operation
off.
9. Press ENTER key to save value and move cursor to
next stage differential.
10. Repeat steps 6 through 9 for Stage 2 and Stage 3
differentials.
11. Press ESCAPE key several times to return to Main
Menu screen.
FIGURE 23
Adjusting Cooling Stage Differentials

Adjusting Heating Staging

This unit uses staging differentials to control heating
operation. The on differential for a stage references
the number of degrees below the setpoint at which
the stage turns on. The off differential for a stage
references the number of degrees above the setpoint at
which the stage turns off.
To adjust heating stage differentials:
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 Adv Sys
Config; press ENTER key.
4. Press UP or DOWN keys to scroll to Heating Setup
B5.
5. Press ENTER key to scroll to Stage 1 On
Differential (see Figure 24).
6. Press UP or DOWN keys to adjust number of
degrees below setpoint to turn heating operation
on.
7. Press ENTER key to save value and move cursor to
Stage 1 Off Differential.
8. Press UP or DOWN keys to adjust number of
degrees above setpoint to turn heating operation
off.
9. Press ENTER key to save value and move cursor to
next stage differential.
Manual 2100-695
Page 16 of 54
10. Repeat steps 6 through 9 for Stage 2 and Stage 3
differentials.
11. Press ESCAPE key several times to return to Main
Menu screen.
FIGURE 24
Adjusting Heating Stage Differentials
Dehumidification
The unit uses a dehumidification sequence that does
not require the electric heat to run at the same time
as the compressor. Instead, the unit will turn on the
compressor to cool down to the heating setpoint.
Once the lower setpoint has been reached, the unit
will heat the space back up to the upper setpoint.
This cycle continues until the humidity level in the
shelter reaches an acceptable level. At this point,
the unit will revert back to normal operation. The
economizer will also be disabled while the unit is in the
dehumidification mode.
NOTE: This feature is dependent upon the LC6000
indoor humidity sensors and a command
from the LC to enter dehumidification mode.
See the latest revision of LC6000 Service
Instructions 2100-669 for adjustment of the
dehumidification setpoint and differentials.

Electronic Expansion Valve (EEV)

EEV Components

Electronic Expansion Valve

The electronic expansion valve is a stepper motor that
is controlled with a step output from the controller. The
valve is capable of 480 steps represented by a 0-100%
signal on the controller. The motor drives a needle valve
that regulates the flow of refrigerant.

EEV Instructions for Vacuum, Reclaim, Charge Unit

The electronic expansion valve moves to the 20% open
position when the unit is not actively cooling. The
valve may need to be manually positioned for service or
troubleshooting. The valve can be positioned by using a
menu override.