Liebert 50 & 60Hz 3.7Time, 3.8Date, 3.9Setback, 3.10Setup Operation, 3.10.1Restart Time Delay

Models: 50 & 60Hz 8 Tons

1 72
Download 72 pages 64 Kb
Page 45
Image 45
3.7Time

Microprocessor Control

3.7Time

The controller time clock must be set to allow for the setback control. The clock uses the 24-hour sys- tem (i.e., 12 midnight is entered 24:00). To change the time press ENTER to select the function, then use the UP/DOWN arrow to change the first character, press ENTER to store, then press the UP/ DOWN arrow key to change the character, press ENTER to store, etc. The real time clock is backed- up.

3.8Date

The controller date must be set to allow for setback control. To change the date press ENTER, then use the UP/DOWN arrow to change the first character, press ENTER to store, press the UP/DOWN arrow key to change the second character, etc.

3.9Setback

The microprocessor can be programmed for night and weekend setback. Two (2) events can be pro- grammed for a five-day workweek and two (2) events can be programmed for a two-day weekend. The following table can be used to devise a setback plan.

Table 11 Night and weekend setback plan

Event

Weekend

Weekday

Time 1

Temperature1

Sensitivity 1

Humidity 1

Humidity Sensitivity 1

Time 2

Temperature 2

Sensitivity 2

Humidity 2

Humidity Sensitivity 2

3.10Setup Operation

Selecting SETUP OPERATION from the Main Menu will display the following selections:

RESTART TIME DELAY

C/F DEGREES

HUMIDITY CONTROL METHOD

LEAD COMPRESSOR

SHOW DIP SWITCH

VALVE TIME (if valve present)

CW FLUSH (if valve present)

Use the UP/DOWN ARROW to scroll through the submenu. Press ENTER to select a particular function.

3.10.1Restart Time Delay

This function delays unit restart after main power is restored to the unit. If several systems are oper- ating, the time delays should be set to different values to cause a sequential start. Delay can be set from 0.1 minutes (6 seconds to 9.9 minutes. Setting the value to zero (0) will prevent unit restart when power is restored. In this case, the unit must be restarted manually by pressing the ON/OFF button on the keypad.

37

Page 45
Image 45
Liebert 50 & 60Hz, 8 Tons user manual 3.7Time, 3.8Date, 3.9Setback, 3.10Setup Operation, 3.10.1Restart Time Delay