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Manual 2100-574
Page 9 of 23
GENERAL PROGRAMMING OVERVIEW
MD4000 CONTROLLER BUTTONS AND FUNCTION
On/Off Button
1. Press and release the On/Off button to turn On controller, 4-character display will illuminate and Lead unit LED will light.
2. Press and release the On/Off button to turn Off controller. Controller will go dark and A/C units will stop.
Comfort Button
1. Press and release the Comfort button to change the Cooling Set Point to 72F and the Heating Set Point to 68F for a period of 1 hour.
2. Set Points will return to the programmed settings automatically after 1 hour.
3. Pressing the Comfort button during the 1 hour period will deactivate the Set Point change.
4. The temperature display will ash the current temperature while in override mode.
Program Button
1. Press the Program button and release it when the message “Prog” appears on the display.
2. Refer to Programming Instructions and follow these commands to change from Default settings.
Advance/Change/Save Button
1. Press and release the Advance button to swap lead and lag unit positions.
2. When in Program mode the Down and Up buttons are used to scroll through the programming steps.
3. A ashing display means that the particular function of that programming step is “set”, and the display will alternate between the step
function and the setting.
4. To change the setting press the Change button and the display will stop ashing, allowing change to the setting.
5. Use Down or Up arrows to change setting as desired, and press the Save button and proceed as desired.
6. When done with programming changes press the Program button until display stops ashing and room temperature is shown.
Up and Down Buttons
These buttons are used to change the settings in conjunction with the Advance/Change/Save button when in programming mode.
CONTROLLER PROGRAMMABLE FEATURES AND DEFAULT SETTINGS
Order /
Display
Description Range / Choice Default
LSEn Temperature at local (main) sensor — —
SP Cooling set point temperature 65 to 90F (18 to 32C) 77F (25C)
db Deadband between cooling SP and heating set point 2 to 40F (1 to 24C) 27F (15C)
r1 Temperature at remote sensor 1 location, if connected — —
r2 Temperature at remote sensor 2 location, if connected — —
cFAn Continuous blower operation None, Lead, Both Lead
deg Controller system operates in F or C F or C F
Alt
Alternating Lead-Lag-Lead-Lag sequence or Non-Alternating Lead-Lead-Lag-Lag sequence —
Yes = Alternating
Not Used Yes
LLCO Lead-Lag changeover time (Days)
1 - 30 days, or 0 for
disabled
7
HP
Heat pump logic enabled — only for 1-stage heat pumps and forces Lead-Lag sequence
(overrides a Non-Alt setting)
Not Used No
Cbd5 Unit 1 and 2 blowers automatically both run if delta T >5F between any 2 connected sensors Yes or No Yes
OFde 3-minute lead unit & 4-minute lag unit off-delay enabled Not Used No
crun Minimum 3-minute compressor runtime enabled Not Used No
LoAL Low temperature alarm setpoint Not Used 45F (7.2C)
HAL1 High temperature alarm level #1 setpoint 70F to 120F (21 to 49C) 90F (32C)
HAL2 High temperature alarm level #2 setpoint 70F to 120F (21 to 49C) 95F (35C)
Locd Controller is locked and no changes can be made. Consult building authority.
If locked, display will show
Locd if changes attempted
Unlocked
Inter-Stage Differential
ISd2 From Stage 1 to Stage 2 Not Used 4
ISd3 From Stage 2 to Stage 3 Not Used 2
ISd4 From Stage 3 to Stage 4 Not Used 2
On/Off Differential (Hysterisis)
CSon Turn "On" above SP for Stage 1 Cooling Not Used 2
CSoF Turn "Off" below SP for Stage 1 Cooling Not Used -4
Stage 2, 3 and 4 Cooling automatically set same as Stage 1 decisions
HSoo All Heating Stages are equal -/+ on & off differential -1/+1 or -2/+2 -2/+2
CoPr
1 or 2-stage compressor, if set to 1 the 2nd stage Cooling Alarm activates on Cooling Call 2,
if set to 2 the 2nd stage Cooling Alarm activates on Cooling Call 3
Not Used 1