ALERTON MICROSET 4 Original operating instructions

MICROSET 4
INSTALLATION &
OPERATIONS GUIDE

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Important safety information and installation precautions
Read all instructions
Failure to follow all instructions may result in equipment damage or a hazardous condition. Read all instructions carefully before
installing equipment.
Local codes and practices
Always install equipment in accordance with the National Electric Code and in a manner acceptable to the local authority having
jurisdiction.
Electrostatic sensitivity
This product and its components may be susceptible to electrostatic discharge (ESD). Use appropriate ESD grounding techniques while
handling the product. When possible, always handle the product by its non-electrical components.
High voltage safety test
Experienced electricians, at first contact, always assume that hazardous voltages may exist in any wiring system. A safety check using a
known, reliable voltage measurement or detection device should be made immediately before starting work and when work resumes.
Lightning and high-voltage danger
Most electrical injuries involving low-voltage wiring result from sudden, unexpected high voltages on normally low-voltage wiring. Low-
voltage wiring can carry hazardous high voltages under unsafe conditions. Never install or connect wiring or equipment during electrical
storms. Improperly protected wiring can carry a fatal lightning surge for many miles. All outdoor wiring must be equipped with properly
grounded and listed signal circuit protectors, which must be installed in compliance with local, applicable codes. Never install wiring or
equipment while standing in water.
Wiring and equipment separations
All wiring and controllers must be installed to minimize the possibility of accidental contact with other potentially hazardous and
disruptive power and lighting wiring. Never place 24VAC or communications wiring near other bare power wires, lightning rods,
antennas, transformers, or steam or hot water pipes. Never place wire in any conduit, box, channel, duct or other enclosure containing
power or lighting circuits of any type. Always provide adequate separation of communications wiring and other electrical wiring according
to code. Keep wiring and controllers at least six feet from large inductive loads (power distribution panels, lighting ballasts, motors, etc.).
Failure to follow these guidelines can introduce electrical interference and cause the system to operate erratically.
Warning
This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case the user will be required to correct the interference at his own
expense.
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Lynnwood, WA 98087 USA
PHONE: [phone] FAX: [phone]
Web Site: www.alerton.com
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!

INSTALLATION & OPERATIONS GUIDE | MICROSET 4
© Honeywell LT-MS4IOG Rev. 04 | Revised October 2015
4
Contents
Quick reference 5
Introduction 7
Specifications 8
Mounting 9
Wiring 14
Wire specifications 14
Power supply guidelines and requirements 14
Microset 4 power ratings 14
Power supply grounding and wiring 14
MS/TP LAN wiring 15
Terminating MS/TP LAN cabling 16
Grounding the MS/TP LAN shield 16
Terminating resistors 16
Wiring the wall sensor 17
Operational overview 18
Hotel vs. office modes 18
Fan-control vs. no-fan-control modes 18
Cooling and heating setpoint calculation 18
After-hours override operation 18
Housekeeping override operation 19
English and metric units 19
Outside air temperature (OAT) display 19
LCD backlight operation 19
Operating mode specifics 20
Enabling operating modes 21
Office modes 21
Hotel modes 24
Operating mode screens 27
Setting the MAC address and BACnet device instance 34
Service mode 35
Field Service Mode 38
Balance Mode 42
Custom Codes Mode 43
Settings Mode 43
Locking the Screen 45
BACnet object and property reference 46
Microset 4 objects 46
Object properties 47
BV and AV assignments 49
Troubleshooting 51
Appendix 52

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Quick reference
Table 1
ID DISPLAY/CONTROL
FUNCTION DESCRIPTION SOFTWARE REMARKS
1 Setpoint (°F or °C as
appropriate)
Room temperature
Override time remaining
ON/OFF status
Humidity
Air Quality (MS4-THC only)
Windows and Lights status (if
configured)
Value associated with data code
(field service mode)
Displays unit setpoint, room temperature,
after-hours/housekeeping timer, or ON/OFF
status, depending on mode of operation. Also
displays humidity value, CO2 concentration
(MS4-THC model), and the Windows and/or
Light status (if configured).
Displays time of day in Across the Room
Views only. Will alternate with setpoint or
room temperature if BV-82 is turned on.
Setpoint = AV-90.
Room temperature = AV-101.
Housekeeping timer or after-hours timer = AV-98.
Timer upper limit = AV-97.
Show ON/OFF mode = BV-65.
Occupied/Unoccupied Status = BV-67.
Show Space Humidity = BV-84.
Humidity = AV-102
CO2 = AV108.
Windows status = BV-87.
Lights status = BV-86.
2UP/DOWN buttons
Adjust setpoint
Fan speed control (M4, M5, M8)
After-hours time (M2, M5)
ON/OFF control (M3, M6)
Window blind control
Lights ON/OFF
Adjust value (field service
mode)
UP button visible unless value is at maximum
value or ON; DOWN button visible unless
value is at minimum value or OFF. Holding UP
or DOWN button causes numeric values to
count up or down.
Button press for setpoint may affect BV-67
according to mode (see Table 6 on page 21). In fan
modes, button press also affects BVs 72–74
(Table 9 on page 49).
3 Heating/cooling status Displays whether the heating or cooling is
active.
Heating icon = BV-77
Cooling icon = BV-78
4Inside air temperature Displays inside air temperature. Inside air temperature = AV-101
5 Outside air temperature (OAT)
(optional)
Outside humidity (optional)
Displays OAT. Optionally, an outside humidity
reading in %RH can display.
OAT = AV-103. Set to -100 to disable OAT at the
display.
Outside %RH = AV-107. If AV-107 is 0, it will not
display.
6Navigation tray Icons correspond to the detail screens
available for display; reverse-color highlight
shows the currently active screen. Only
features that are enabled will be shown.
7LEFT/RIGHT buttons
Scroll through Detail screens or
codes (field service mode)
Navigates through other detail screens.
Press both buttons to access Service Mode.
8LED Status Lights Default settings - gives visual indication to
occupants of the status of the zone where
Blue = Cooling, Amber= Heating,
Green = Unoccupied/Energy Savings,
Red = No communication
LED status Lights can be configured through DDC
controlling AV-110.

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Quick reference
The Microset™4 generally displays an Across the Room View when it is not being actively used by a
room occupant or a Detail Screen view when it is being used to adjust room settings.These screens can
display a wide range of information depending on Microset 4 model, configuration, and settings.
AIR QUALITY
PPM
464
CO2
Active Screen
Current Readings/Status
Detail Screen View Examples
Across The Room Screen View Examples
Unoccupied State
All Black (Blank)
Set Point, Room Temperature, or
Override Timed-Out Default* OFF State
WINDOWS
CLOSED
CO2
OPEN
72
F
Time of day displayed when BV-82 is ON. The MS/TP Microset 4
or VLC must be time-synced. BV-83 controls format (12- or 24-hour).
*
OFF

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INSTALLATION & OPERATIONS GUIDE | MICROSET 4
Introduction
The Microset 4 is a wall-mounted BACnet smart sensor. It is designed for applications with multiple
zones, such as a restaurant or a shopping mall; or split zone control sites, like an office setting where
occupants share a single zone split into multiple working areas.
Features:
• Supports MS/TP communications (MS4-TH-MSTP model only)
• Outside and room humidity display
• Outside and room temperature display
• Fan speed display/adjustment (up to three speeds and Auto)
• Setpoint display/adjustment
• After-hours/housekeeping overrides
• Optional time of day display
• Heating or cooling mode display
• English or metric units

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Specifications
System compatibility
The Microset 4 sensors work with legacy VLCs and ROCs, but also support optional new features that
require a new ROC to support. These features include transfer of CO2 data to the VLC, password
protection of Service Mode, user control of LEDs, and data support for controlling a room’s windows
and lights.
Table 2 Microset 4 specifications.
Part Numbers MS4-TH – Base model with temperature and humidity sensing.
MS4-TH-NL – Base model with no Alerton logo.
MS4-TH-MSTP – Temperature and humidity sensing, BACnet MS/TP bus compatible.
MS4-THC – Base model and air quality (CO2) sensor
Power 24 VAC @ 3 VA
MS/TP
(MS4-TH-MSTP model)
MS/TP LAN operates up to 115 Kbps
Dimensions
(MS4-TH, MS4-TH-NL,
MS4-TH-MSTP)
4.370" (111 mm) H x 2.857" (73 mm) W x 0.678"
(17.23 mm) or 0.895" (22.73 mm) D
Dimensions
(MS4-THC)
4.536" (115.22 mm) H x 3.040" (77.22 mm) W x 1.027"
(26.08 mm) or 1.243" (31.58 mm) D
Operating Temp.
Humidity Sensor Accuracy
Repeatability
50–113 °F (10–45 °C)
±3% RH @ 10–90% RH, ±5% @ 0–10% RH and 90%–100% RH
Minimum ±0.5% RH.
CO2 Sensor Operating
Temp (CO2 Sensor not
available on MS4-TH-
MSTP)
CO2 Sensor
Measurement Range
CO2 Sensor Accuracy
-32–122 °F (0–50 °C)
-0–5000 ppm
±30 ppm, ±3% at reading
Ratings EMC Directive 89/336/EEC (European CE Mark).
FCC Part 15, Subpart J, Class B.
UL 916 Certified

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INSTALLATION & OPERATIONS GUIDE | MICROSET 4
Mounting
The Microset 4 is designed to be wall-mounted indoors, with dimensions ideal for mounting to a single-
gang electrical box. See Figure 11 on page 17.
Installation best practices
A building’s environment may introduce challenges when looking for the ideal installation location and
may also impact how a Microset 4 can be installed. For example, architects may not understand how
the placement of windows, doors, air registers, printers, and other equipment impact temperature
sensors. Or if a Microset 4 can be installed in an all-glass atrium without regard for the direction of the
sun.
Properly locate sensors
Sensor location impacts accuracy when sensing air temperature.
To meet requirements of the Americans with Disabilities Act, mount no higher than 48" from the floor
and with a minimum clear floor space of 30" X 48" (760 X 1220 mm). See Figure 1.
Figure 1 Mounting guidelines for compliance with Americans with Disabilities Act (ADA).
• Do not install the sensor where it will be exposed directly to solar radiation.
• Do not install the sensors into shelving or alcoves.
• Do not install near heat generating equipment, e.g. printers, coffee post, lamps, etc.
• Do not install adjacent to or behind doors.
• Never install behind curtains and/or blinds.
• When installing onto a solid wall (concrete, etc) always use insulated foam backing between the
backplate and the wall.
• Do not mount onto walls that conceal hot water pipes.
Diffuser airflow
Do not install sensors directly in line with the air flow coming from air distribution diffusers. Adjust the
diffusers to reduce air flow across the wall if you take a reading at the wall where the sensor is located
and it is greater than 30 fpm (9.14 mpm).
Prevent air infiltration
Prevent air from infiltrating through wire and screw holes in the Microset 4 backplate by affixing a
closed-cell foam barrier to the backplate. The foam covers all holes and provides a barrier between the
Microset 4 which prevents the effects of wall coupling. For more information about preventing air
infiltration, see “Optional foam accessory” on page 52.

INSTALLATION & OPERATIONS GUIDE | MICROSET 4
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Figure 2 Install a closed-cell foam barrier between the Microset 4 backplate and the wall.
Figure 3 Completely cover all holes in the Microset 4 backplate to safeguard against air infiltration.
Alerton recommends the M-D Light Switch Sealers model #03434 (or equivalent closed-cell foam).
Lowes.com Item # 61217.
Figure 4 Example closed-cell foam barrier material.

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INSTALLATION & OPERATIONS GUIDE | MICROSET 4
The mounting location also must not require longer wire lengths than shown in Table 3.
Figure 5 Backplate mounting dimensions.
NOTE Microset 4 with CO2 sensor is larger: 3.040 in. (77.22 mm) wide, 4.536 in. (115.22 mm) high,
and 1.27 in. (26.08 mm) or 1.243 in. (31.58 mm) deep.
Two screws attach the backplate to an electrical box, mud ring, or other mounting surface.
Table 3 Maximum wire length
MODEL
MAX LENGTH (FT)
COMM WIRE 24V WIRE
Microset Bus (direct VLC connection)
MS4-TH 250 *
MS4-THC 250 *
MS4-TH-NL 250 *
MS/TP Bus
MS4-TH-MSTP 4000 *
*Power wire selection should follow local code recommendations for VA and size
0.895
(22.73)
0.678
(17.23)
4.370
(111)
2.480
(63)
3.189
(81)
2.362
(60)
2.874
(73)

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Removing Sensor from wallplate
Figure 6 Removal of Microset 4 from the wallplate.
1. Use a Torx key or screwdriver to loosen the setscrew (if present) on the bottom.
2. Remove the setscrew (if present), but keep it to re-install after the Microset 4 is mounted.
3. Push up the two tabs shown in Figure 6, then pull the bottom of the Microset 4 away from
the wallplate. Lift the Microset 4 from the wallplate.
Mounting the wallplate
See the mounting template in Figure 7.
New Construction
In new construction, rough-in for the Microset 4 is standard 2 in. x 4 in. (50.8 mm x 101.6 mm) single
gang wiring box or a single-gang mud-ring. Skip to Step 6.
Remodel or Retrofit
Use a single-gang old work (or remodel) box or mud ring. Skip to Step 6.
Mount the Microset 4 vertically on the wall.
1. Position and level the wallplate (for appearance only) or use the template in Figure 7.
2. Use a pencil to mark the mounting holes and the wiring opening (dashed line in Figure 7).
3. Cut the wiring opening.
4. Drill two pilot holes in the wall, on your marks.
For drywall, drill 3/16-in. holes.
For plaster or firmer material, drill 7/32-in. holes.
1
2
3

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INSTALLATION & OPERATIONS GUIDE | MICROSET 4
5. Gently tap anchors into the pilot holes until flush with the wall.
6. Pull the wires through the wiring opening, and position the wallplate over the mounting
holes.
7. Insert the screws into the holes and tighten.
Figure 7 Microset 4 mounting template.

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Wiring
CAUTION Half-wave devices and full-wave devices must not use the same AC transformer. You must
maintain wiring polarity. Failure to do so can result in equipment damage.
Wire specifications
Maintain polarity of the wire run throughout the LAN.
NOTE Do not run Microset 4 wire in the same conduit or alongside building power cables. This can
cause interference. If power cables must be crossed, cross at 90°.
Power supply guidelines and requirements
The wall sensor uses 24 VAC power from a UL Listed Class 2, 24 VAC transformer (not provided). The
wall sensor uses a half-wave rectifier to convert the AC power supply to onboard power. Multiple half-
wave devices may be powered from one, grounded transformer.
CAUTION If a Microset 4 will share its power supply with another device, make sure that the other
device utilizes a half-wave rectifier and that polarity of wiring is maintained. Failure to do so
can result in equipment damage.
Figure 8 Internal Microset 4 power wiring schematic, half-wave rectifier.
Microset 4 power ratings
The Microset 4 minimum current draw is 24 VAC @200mA leading to 3VA.
Power supply grounding and wiring
When connecting power to the Microset 4, ensure that one leg of the VAC secondary circuit connects to
a known earth ground.
Supplying a high-quality ground connection to a Microset 4 is one of the most important things you can
do to ensure a trouble-free installation.
The 24VAC secondary leads are not interchangeable. Once a lead connects to the GND wire on the
Microset 4, it is the grounded lead. Observe and maintain polarity for subsequent connections. The
GND terminal provides a reference ground for the circuit board and communications wiring. Use 18
AWG cable for best results.
WARNING Ensure that all Microset 4 power and communications cabling are grounded according to these instructions.
Failure to follow these instructions may result in Microset 4 operational and communication failures or equipment
damage.
Power supply wire selection
If you are considering long power supply wiring runs, using the right wire size is critical. If the wire is too
small, the resistance may be too high, resulting in a low voltage supply. This is known as line loss. The
wire size is based on the length of the wire run and the current draw of the Microset 4. Use Figure 9 to
determine wire size; obtain additional information from the transformer manufacturer.

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INSTALLATION & OPERATIONS GUIDE | MICROSET 4
Figure 9 Microset 4 wiring recommendations
MS/TP LAN wiring
The MS/TP Microset 4 communicates on the site-wide BACnet system over a twisted-pair MS/TP LAN,
which uses the EIA–485 signaling standard. MS/TP Microset 4s are master devices on the MS/TP LAN.
Each MS/TP Microset 4 employs a high-quality EIA–485 transceiver and exerts 1/4 unit load on the MS/
TP LAN. The maximum number of MS/TP Microset 4 units that can be installed per MS/TP segment
depends on the device the MS/TP Microset 4s are being connected to. Refer to the BACtalk System
Design Guide, LTBT-TM-SYSDSGN, for more information, or the user documentation of the global
controller that provides the MS/TP trunk to determine how many devices it can support.
Table 4 MS/TP LAN facts
Transmission speed 9.6, 19.2, 38.4, 76.8, 115.2Kbps (configured at global controller).
Layout Bus.
Cabling BACnet specifies the following:
Shielded, twisted-pair cabling with characteristic impedance between 100 and 130Ohms.
Distributed capacitance between conductors must be less than 30 pF/foot (100 pF/m).
Distributed capacitance between conductor and shield must be less than 60 pF/foot (200 pF/m).
Foil or braided shield acceptable.
Segment length 4000 ft. (1219 m.) per segment using recommended wire at transmission speeds up to 76.8Kbps.
2500 ft. (762 m.) per segment using recommended wire at transmission speed of 115.2Kbps.
Maximum devices
overall
Maximum number of devices is 127. This includes VLCs, BACtalk global controllers (all are
considered masters) and any other devices, regardless of their relative unit loads.
Maximum devices per
segment
Depends on relative unit load of devices.
MS/TP Microset 4 exerts 1/4 unit load.
Repeaters Required when making runs longer than 4000 ft. Three repeaters maximum between any two
devices. MS/TP-LAN repeater does not support 115.2Kbps.

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© Honeywell LT-MS4IOG Rev. 04 | Revised October 2015
16
Terminating MS/TP LAN cabling
IMPORTANT Always use communications grade connectors, such as 3M Scotchlok or equivalent, when splicing pigtails
with LAN cabling.
Grounding the MS/TP LAN shield
Proper shield grounding of the cabling can help minimize the risk of communications problems and
damage to equipment because of transient voltage spikes (for example, lightning strikes).
Follow these guidelines for grounding cable shields:
• Each segment must have a single point of shield ground, as close to the middle of the cabling run
as possible (see Figure 10).
• Do not ground the shield directly to a Microset 4 wire.
• Never ground both ends of a shield because differences in potential between the grounds may
induce current on the shield, causing interference.
• At connecting termination points, tie the shield through with a wire nut.
• At ungrounded, exposed shield points (the end of a segment), tape back the shield to the wire
jacket or, for optimum transient shunting, use 100V gas discharge tubes or 120V MOVs between
the shield and ground. See Figure 10.
Figure 10 Shield drain termination and tie through.
Terminating resistors
At the last device on each end of the MS/TP segment, matched terminating resistors wired across MS/
TP+ and MS/TP– are required for signal integrity.
Optimum segment performance typically requires “tuning,” a process by which the value of the
terminating resistors is selected based on the wave form of signals on the segment. View wave forms
using an industrial scope meter. The goal is to have as square a wave form as possible with an
amplitude greater than 200 mV. Resistors affect the wave form as follows:
• When the resistance value decreases, the amplitude of the wave form decreases and becomes
more square.
• When the resistance value increases, the amplitude of the wave form increases and becomes less
square.
Terminating resistors Matched resistors required at each end of segment bus wired across (+) and (–). Use matched
precision resistors rated ¼W ±1% / 80–130 Ohms. Smoke control applications with the VAV-SD-S
or the VLC-1188-S may require UL-864 listed terminating resistors.
Shield grounding Ground shield drain wire at single point earth (panel) ground, not Microset 4 ground. Tape off
shield drain wire at other end. Tie shield drain wire through at each MS/TP Microset 4.
Table 4 MS/TP LAN facts (Continued)
Shield drain may be taped back to jacket or routed through MOV or gas discharge tube to ground.
TTTT TTT
T=Shield Tie Through
VLC MS4-TH-
MSTP
MS4-TH-
MSTP
MS4-TH-
MSTP
MS4-TH-
MSTP
VLC VLC VLC
(Optional) 120V MOV
OR
100V Gas Discharge Tube
(Optional) 120V MOV
OR
100V Gas Discharge Tube
ACM

© Honeywell LT-MS4IOG Rev. 04 | Revised October 2015 17
INSTALLATION & OPERATIONS GUIDE | MICROSET 4
Typically, precision resistors in the range 80-130 Ohms (+1%) yield acceptable results. Ideally, the
value of the terminating resistors should match the rated characteristic impedance of the installed
cable. For example, if the installed cable has a listed characteristic impedance of 100 Ohm, install 100
Ohm matched precision resistors.
CAUTION Do not mismatch terminating resistors. Ensure that both resistors on a segment have the
same value.
Wiring the wall sensor
CAUTION Power must not be connected while wiring. Wiring a unit that is powered may result in electrical shock and/or
equipment damage.
1. Connect wires to the terminal blocks. The terminals are as follows:
2. Secure backplate to mounting surface with screws (provided).
3. Push excess wire back into the hole and plug the hole with non-flammable insulation to
prevent drafts from affecting the wall sensor. Check for loose or frayed wire that may cause
a short.
Figure 11 Microset 4 mounting connections.
Mounting the wall sensor on the wallplate
4. Insert Microset 4 tabs into backplate slots. See Figure 11.
5. Push bottom of Microset 4 until it clicks into position. See Figure 11.
6. (Optional) Install security setscrew.
Non-MS/TP MS/TP
24 VAC/DC+ 24 VAC/DC+
COM IN-0/MSET
GND +MS/TP
-MS/TP
1
2
4
3
5

INSTALLATION & OPERATIONS GUIDE | MICROSET 4
© Honeywell LT-MS4IOG Rev. 04 | Revised October 2015
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Operational overview
The Microset 4 operates in one of nine modes. In each mode, the Microset 4 displays data and has
operational features unique to that mode. Operating modes are listed in Table 5 on page 20 and Table 6
on page 21.
Review the different Microset 4 modes and determine which one is best for your application. Then set
BVs 64, 65, 80, and 81 according to Table 6 on page 21.
BACtalk data displays can directly reference data points in the Microset 4 reserved for Microset
operations. This offers the system operator flexibility and ease of use: with a mouse click, the system
operator can control Microset 4 operations.
Hotel vs. office modes
BV-81 controls hotel and office mode (BV-81 ON = hotel). The primary difference between hotel and
office mode is the function of the after-hours timer as compared to the function of the housekeeping
timer. See “After-hours override operation” and “Housekeeping override operation” herein. Other
operational details vary as well. See “Operating mode specifics” on page 20.
Fan-control vs. no-fan-control modes
BV-80 determines fan control mode (BV-80 ON = fan-control mode).
In fan-control modes, the occupant can select fan speed at the Microset 4. Fan-control modes are
typically used in fan-coil, air conditioning, or unit ventilator applications.
In no-fan-control modes, the occupant is unable to select fan speed. No-fan-control modes are typically
used in VAV or heat pump applications.
Cooling and heating setpoint calculation
The VLC calculates current heating and cooling setpoints (AV-99 and AV-100) using different logic in
occupied and unoccupied modes (as read from BV-67). Using the current setpoints (AV-99 and AV-100)
in your control DDC is most efficient because the VLC automatically calculates these setpoints
according to the operating status of the VLC.
Occupied setpoint logic (BV-67 ON)
• Current cooling setpoint (AV-99) = Occupant-selected space temperature setpointa(AV-90) +
Cooling offset (AV-93) + Demand offset (AV-106)
• Current heating setpoint (AV-100) = Occupant-selected space temperature setpointa(AV-90) –
Heating offset (AV-94) – Demand offset (AV-106)
Unoccupied setpoint logic (BV-67 OFF)
• Current cooling setpoint (AV-99) = Unoccupied cooling setpoint (AV-95)
• Current heating setpoint (AV-100) = Unoccupied heating setpoint (AV-96)
After-hours override operation
Unoccupied office modes (M2 and M5) offer an after-hours override feature, which enables the
occupant to override a scheduled unoccupied status at the Microset 4.
In override, the unit calculates current setpoints (AV-99 and AV-100) using occupied setpoint logic (see
“Cooling and heating setpoint calculation” on page 18). The occupant can increase or decrease the
timer to the next half-hour increment. The occupant can also adjust the setpoint and fan speed (if
applicable).
aThe system’s setpoint high limit (AV-91) and setpoint low limit (AV-92) limit this value.

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INSTALLATION & OPERATIONS GUIDE | MICROSET 4
The after-hours timer (available in software as AV-98) automatically counts down whenever it is set to a
non-zero value.
To disable this feature, set the after-hours timer limit (AV-97) to zero.
DDC can read override status from BV-66, which is ON if the after-hours timer is non-zero. When BV-64
(occupied/unoccupied command) is ON, the after-hours timer automatically resets to zero.
Housekeeping override operation
Vacant hotel modes (M7 and M9) offer a housekeeping override. This is similar to the after-hours
override in that it causes occupied setpoint logic to be in effect. However, there are important
differences: the occupant can only start and stop the timer (timer adjustment is not allowed); the
override timer limit (AV-97) is read in minutes, not hours.
This feature can be disabled by setting the override timer limit (AV-97) to zero.
DDC can read override status from BV-66, which is ON if the housekeeping timer is non-zero. When
BV-64 (occupied/unoccupied command) is ON, the housekeeping timer automatically resets to zero.
English and metric units
You can set the Microset 4 to display English or metric units based on the selection in the DDC header
file or you can toggle that status in software. The English or metric setting is referred to as the native
units mode.
BV-69 can be set ON to reverse native units mode for the Microset 4 display. Thus, if the Microset 4 is
set to English, and BV-69 is ON, the Microset 4 displays units in appropriate metric equivalents. This
enables the system to display units at the Microset 4 according to occupant preference without a
programmer having to write separate DDC sequences around each unit of measure.
Outside air temperature (OAT) display
For OAT read at another unit to display at the Microset 4, the OAT value must be written in BCM DDC to
the Present Value of AV-103 in the Microset 4 or the VLC. Set AV-103 to -100 to disable the OAT
display.
LCD backlight operation
In Occupied mode, or during Unoccupied mode with After-hours Override, the backlight dims after 20
seconds of no button activity.

INSTALLATION & OPERATIONS GUIDE | MICROSET 4
© Honeywell LT-MS4IOG Rev. 04 | Revised October 2015
20
Operating mode specifics
This topic provides LCD, button operation, for each of the operating modes. Use Table 5 to compare
operating mode features.
Use Table 6 on page 21 to determine values to set for enabling each operating mode.
Table 5 Operating mode feature comparison.
FEATURES
MODE ID MODE NAME
OCCUPANT SETPOINT
ADJUSTMENT
OCCUPANT FAN SPEED
CONTROL
OCCUPANT
ON/OFF CONTROL
AFTER-HOURS
OVERRIDE
HOUSEKEEPING
TIMER
ALTERNATE
TIME OF DAY DISP.
VIEW UNOCCUPIED
SETPOINTS
Office Modes
No fan control
M1 Office, no fan, occupied ✔✔
M2 Office, no fan, unoccupied a
aAvailable only when after-hours override is active.
✔ ✔ ✔
M3 Office, no fan, ON/OFF ✔✔ ✔
Fan control
M4 Office, fan, occupied b
bAvailable only when fan is running.
✔✔
M5 Office, fan, unoccupied ✔a✔a✔ ✔ ✔
Hotel Modes
No fan control
M6 Hotel, no fan, rented ✔✔ ✔
M7 Hotel, no fan, vacant ✔
Fan control
M8 Hotel, fan, rented b✔ ✔
M9 Hotel, fan, vacant ✔