Emerson VH User Manual
Advanced Microprocessor with Graphics Control Setup
28
4.8.4 DIP Switches
The DIP switch settings can be reviewed from the display panel. Changing the DIP switches requires
opening the front panel for access to the DIP switches on the microprocessor control board.
These selections should match options installed on your unit and should not need to change during
normal operation. Switches 1 through 7 are self explanatory. DIP switch 8, not shown in the table,
enables the password feature when set to ON and disables the password feature if set to OFF.
Dehumidification with Normal or Delayed Reheat
Dehumidification with normal reheat allows for operating both compressors and reheats simulta-
neously. It is very important that electrical service to the unit be sized and wired for this option if
selected.
With delayed reheat selected, the reheats are prevented from turning on when dehumidifying with
both compressors until the point at which 100% heating is called for. At this time, the compressors
are turned off until the reheats bring the temperature back up to the point at which the reheats are
turned off.
4.9
Main Menu (AG)—Date and Time
The current date and time is available through the display. This feature allows the date and time to
be read or changed and is accessed by selecting “DATE AND TIME” from the Main Menu. The “DATE
AND TIME” is used by the control for recording the Alarm History and plotting graphs.
The date and time are backed up by a battery.
4.10 Main Menu (AG)—Plot Graphs
Selecting Plot Graphs will step to the following menu:
• TEMPERATURE PLOT
• HUMIDITY PLOT
• ANALOG SENSOR #1 PLOT
• ANALOG SENSOR #2 PLOT
• ANALOG SENSOR #3 PLOT
• ANALOG SENSOR #4 PLOT
• MODIFY PLOT SCALES
• HUMIDITY PLOT
• ANALOG SENSOR #1 PLOT
• ANALOG SENSOR #2 PLOT
• ANALOG SENSOR #3 PLOT
• ANALOG SENSOR #4 PLOT
• MODIFY PLOT SCALES
NOTE
Power MUST be cycled off, then on from the unit disconnect switch for the control system to
Power MUST be cycled off, then on from the unit disconnect switch for the control system to
update the DIP switch settings (except for switch 8).
Table 11
DIP switch settings
Number
OFF
ON
1
Compressor Cool
Chilled Water
2
Electric/Hot Gas Reheat
Hot Water Reheat
3
2 Step
4 Step
4
No GLYCOOL
GLYCOOL
5
No Dual Cooling
Dual Cooling
6
Not Used
Not Used
7
Delayed Reheat
Dehumidification with Normal Reheat
!
CAUTION
The result of electrical service to the unit not being sized properly for this option could be
nuisance trips of the building circuit breakers (or fuses) or, in extreme cases, damage to
building wiring.
NOTE
The clock uses the 24 hour system (For Example: 17:00 would be 5:00 PM).
The clock uses the 24 hour system (For Example: 17:00 would be 5:00 PM).