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Quick Reference

Alerton Microset™ II

Mode IDs

Code	Mode
M1	Office, no fan, occupied
M2	Office, no fan, unoccupied
M3	Office, no fan, ON/OFF
M4	Office, fan, occupied
M5	Office, fan, unoccupied
M6	Hotel, no fan, rented
M7	Hotel, no fan, vacant
M8	Hotel, fan, rented
M9	Hotel, fan, vacant

Field Service Codes

Code	Data point	Meaning
UC.	AV-95	Unoccupied cooling setpoint
UH.	AV-96	Unoccupied heating setpoint
CO.	AV-93	Cooling offset
HO.	AV-94	Heating offset
HS.	AV-100	Occupied heating setpoint
CS.	AV-99	Occupied cooling setpoint
AL.	AV-97	Override limit
HI.	AV-91	Setpoint high limit
LO.	AV-92	Setpoint low limit
SP.	AV-90	Occupant-selected space temperature setpoint
SC.	n/a	Size, cooling—size of VAV cooling duct diameter in inches or cm
SH.	n/a	Size, heating—size of VAV heating duct diameter in inches or cm
CF.	n/a	Cold flow—the current airflow in the VAV box cold duct in cfm or lps
HF.	n/a	Hot flow—the current airflow in the VAV box hot duct, in cfm or lps

Functions

Display or control function	Description	Remarks
Setpoint (°F or °C as appropriate) Override time remaining ON/OFF status Time of day (optional alternate) Value associated with data code (field service mode)	Displays unit setpoint, after-hours/housekeeping timer, ON/OFF status, or value of field service code, depending on mode of operation. Optionally, in modes M1-M6, the time of day can display alternately on a three-second cycle with any of the above.	* Setpoint = AV90 * Housekeeping timer or after-hours timer = AV98 * ON/OFF mode = BV65 * Time of day is read directly from the VLC when BV82 is ON. The VLC must be time-synced. BV83 controls format (12-or 24-hour).
Outside air temperature (OAT) Outside humidity (optional alternate)	Displays OAT. Optionally, an outside humidity reading in %RH can display alternately on a three-second cycle with the OAT.	OAT = AV103, which is written to in DDC. %RH = AV107. If AV107 is non-zero display will cycle.
Fan status	Displays occupant-selected fan status and speed in modes M4, M5, M8, and M9. In these modes, the occupant can use the right UP/DOWN buttons to increase and decrease the fan speed. In other modes, occupant adjustment is disallowed, but DDC can control the fan status and speed display, nonetheless.	Only one of the following BVs may be ON; otherwise, the Microset II indicates a high fan speed: * Blank = BVs 72-74 OFF * Low = BV72 ON * Med = BV73 ON * High = BV74 ON
Space temperature Space humidity (optional alternate for MS-2000H) Field service code (field service mode)	Displays space (room) temperature. The Microset II with humidity sensor (MS-2000H), can display the room %RH alternately with the room temperature on a three-second cycle.	Space temperature = AV101. AI-0 is room temperature as read by the Microset II thermistor. VLC DDC must transfer AI-0 to AV101 for space temperature display. Display will cycle between space temperature and humidity if BV84 is ON. Space humidity = AV102. No DDC required. AV102 cannot store other values.
Right UP / DOWN buttons * Fan speed control (M4, M5, M8) * After-hours increment/decrement (M2, M5) * ON/OFF control (M3, M6) * Housekeeping timer ON/OFF (M7, M9) * Adjust value (field service mode)	Button press causes only affected value on LCD to appear; all others disappear. Display remains in this state for three seconds after button release.	Button press affects BV67 according to mode (see Table 4 on p. 13). In fan modes, button press also affects BVs 72–74 (Table 7 on p. 26).
Left UP / DOWN buttons * Adjust setpoint * Display unoccupied heating / cooling setpoints (M2, M5) * Scroll through codes (field service mode)	Button press causes only affected value on LCD to appear; all others disappear. Display remains in this state for three seconds after button release.

Table of Contents

Quick Reference

Mode IDs

Field Service Codes

Functions