Daikin IM 1093-1 Manual

Installation and Maintenance Manual IM 1093-1
Group: Controls
Part Number: IM 1093
Date: February 2015
Single Duct VAV Terminals

IM 1093-1 • SINGLE DUCT VAV TERMINALS 2 www.DaikinApplied.com
Table of ConTenTs
Table of ConTenTs
Introduction..................................3
Revision History ............................3
Reference Documents ......................3
Limited Warranty ...........................3
Notice....................................3
Hazard Identication Messages................3
Installation ..................................4
Receiving Inspection ........................4
Hanging/Installation Requirements .............4
Minimum Clearance for Access ................5
Connecting Ductwork........................5
Field Electrical Wiring .......................5
MQTHI5 Single Duct Terminal Units
with Electric Heat ...........................6
MQTHI5 Single Duct Terminal Units
with Hot Water Coils.........................6
Controls ..................................6
Labeling ..................................6
MQTHI5 Flow Sensor .......................6
Troubleshooting ..............................7
Investigating Noise Complaints ................7
Discharge Noise............................7
Radiated Noise ............................7
Controls ..................................7
Electric Duct Heater .........................7
Specic Electric Heat
Troubleshooting Procedures: .................8

InTroduCTIon
www.DaikinApplied.com 3 IM 1093-1 • SINGLE DUCT VAV TERMINALS
InTroduCTIon
Revision History
IM 1093-1 Date: February 2015 Rebranded
IM 1093 Date: October 2010 Initial release
Reference Documents
Number Company Title Source
ANSI/ASHRAE
135-2001
American
Society of
Heating,
Refrigerating
and Air
Conditioning
Engineers
BACnet®- A Data
Communication
Protocol for
Building Automation
and Control
Networks
www.ashrae.org
OM 1092 Daikin
Applied
Operators Manual,
Delivered VAV
Systems
www.DaikinApplied.com
ED 15126 Daikin
Applied
Maverick™I Unit
Controller Protocol
Information,
BACnet and
LONWORKS®
Networks
www.DaikinApplied.com
ED 15113-2 Daikin
Applied
BACnet Protocol
Implementation
Conformance
Statement (PICS)
for MicroTech
III Applied Air
Handling Unit
Controller
www.DaikinApplied.com
ED 15112-7 Daikin
Applied
BACnet and
LONWORKS
Protocol
Information for
Rooftop and Self-
Contained Units
with MicroTech III
Controls
www.DaikinApplied.com
Limited Warranty
Consult your local Daikin representative for warranty
details. To nd your local Daikin representative, go to
www.DaikinApplied.com.
Notice
Copyright © 2015 Daikin Applied, Minneapolis MN. All rights
reserved throughout the world.
Daikin Applied reserves the right to change any information
contained herein without prior notice. The user is responsible
for determining whether this software is appropriate for his or
her application.
® ™ The following are trade names or registered trademarks of
their respective companies: BACnet from the American Society
of Heating, Refrigerating and Air-Conditioning Engineers, Inc.;
LONWORKS from Echelon Corporation; Windows and Internet
Explorer from Microsoft Corporation; Maverick, RoofPak and
Daikin from Daikin Applied
Hazard Identication Messages
DANGER
Dangers indicate a denate hazardous situation, physical
or electrical, which will result in death or serious injury if not
avoided.
WARNING
Warnings indicate potentially hazardous situations, which can
result in property damage, severe personal injury, or death if
not avoided.
CAUTION
Cautions indicate potentially hazardous situations, which can
result in personal injury or equipment damage if not avoided.
DANGER
Electric shock hazard. Can cause personal injury or
equipment damage.
This equipment must be properly grounded. Connections
and service to the MicroTech III Air Handling Unit Controller
must be performed only by personnel knowledgeable in the
operation of the equipment being controlled.
CAUTION
Static sensitive components. Can cause equipment
damage.
Discharge any static electrical charge by touching the bare
metal inside the control panel before performing any service
work. Never unplug cables, circuit board terminal blocks, or
power plugs while power is applied to the panel.
NOTICE
This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance
with this instruction manual, may cause interference to radio
communications. It has been tested and found to comply with
the limits for a Class A 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. 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 or her own expense.
Daikin Applied disclaims any liability resulting from any
interference or for the correction thereof.

IM 1093-1 • SINGLE DUCT VAV TERMINALS 4 www.DaikinApplied.com
InsTallaTIon
InsTallaTIon
Receiving Inspection
Prior to removing the shipping material, visually inspect the
packing materials. There should be a black plastic strip wrapped
in the clear plastic shrink wrap. If this black plastic strip is
missing, the shipment may have been repacked by the shipper
and you should make note of this on the shipping documents
and inform the delivering carrier. After unpacking the terminal,
check it for shipping damage. If any shipping damage is found,
report it immediately to the delivering carrier. Store units in a
clean, dry location prior to installation. Units with controls are
not recommended for use in ambient temperatures greater
than 95°F. For protection of controls, do not store in ambient
temperatures greater than 135°F. Caution: Do not use the
ow sensor, connecting tubing, or damper shaft as a lift point.
Damage to the ow sensor or controls may result.
Hanging/Installation Requirements
IMPORTANT
If equipped with pneumatic controls, the orientation of the
terminal is critical. The pneumatic controls must be mounted
right side up. The single duct unit must be level within + or –
10 degrees of horizontal, both parallel to the air ow and at
the right angle of air ow. The control side of the terminal is
labeled with an arrow indicating UP. Unless otherwise noted,
most analog and digital controls may be installed in any
orientation. Check with the local Daikin representative for
verication.
CAUTION
Cautions indicate potentially hazardous situations, which
can result in personal injury or equipment damage if not
avoided.
The equipment is heavy and counted in the ceiling. Use
caution and follow OSHA and SMACNA installation guidelines.
Unless local building codes require hangers, the smaller
size basic single duct terminals may be light enough to be
supported by the ductwork itself. However, when accessory
modules, such as DDC controls, hot water coils, or sound
attenuators are included, the single duct terminal should be
supported directly. Straps screwed directly into the side of the
terminal, trapeze hangers, or the method prescribed for the
rectangular duct on the job specications may be used (See
Figure 1 and Figure 2). The MQTHI5 Single Duct Terminal is
not suitable for outdoor use.
Figure 1: Strap-Hangers

InsTallaTIon
www.DaikinApplied.com 5 IM 1093-1 • SINGLE DUCT VAV TERMINALS
Figure 2: Trapeze-Hangers
Minimum Clearance for Access
Single Duct Air Terminals require sufcient to allow servicing
of the actuator, controls and single electric power hook-
up (if applicable). Horizontal clearance requirements are
dependent upon access panel dimensions which are
indicated on the appropriate submittals (for control panel
enclosure access a minimum of 18" is recommended. See the
appropriate submittal for control panel location). NOTE: These
clearance recommendations are not meant to preclude NEC
requirements or local building codes.
Connecting Ductwork
Slip each inlet duct over the inlet collar of the terminal. Fasten
and seal the connection by the method prescribed by the job
specication. The diameter of the inlet duct “D” in inches must
be equal to the listed size of the terminal; e.g. a duct that
actually measures 8 inches must be tted to a size 8 terminal.
The inlet collar of the terminal is made 1/8 inch smaller than
listed size in order to t inside the duct.
NOTE: Do not insert duct work inside the inlet collar of the
assembly.
Inlet duct should be installed in accordance with SMACNA
guidelines. If a single point electronic velocity sensor is
installed, it is recommended that the installer provide three to
ve diameters of straight duct at the terminal inlet. The outlet
end of the terminal is designed for use with slip and drive duct
connections (anged outlets optional). A rectangular duct the
size of the terminal outlet should be attached.
Field Electrical Wiring
DANGER
Electric shock hazard. Can cause personal injury or
equipment damage.
This equipment must be properly grounded. Connections and
service to the MicroTech III Chiller Unit Controller must be
performed only by personnel knowledgeable in the operation
of the equipment being controlled.
• All eld wiring must comply with the local codes and with
the National Electrical Code (ANSI/NFPA 70-2002).
• When applicable, electrical, control and piping diagrams
are shown on labels attached to the exterior of the single
duct unit.
• Use copper conductors only!
• All terminal units must be properly grounded per NEC
424-14 and 250.
• Always check product label for voltage and current data
to determine the proper wire size and current protection.
• The control cabinet contains live electrical parts!
Contacting these parts with the power applied may cause
serious injury or death. The control cover must be closed
prior to applying electric power to the unit.
• These recommendations are not meant to preclude
NEC requirements or local building codes that may be
applicable, which are the responsibility of the installing
contractor.

IM 1093-1 • SINGLE DUCT VAV TERMINALS 6 www.DaikinApplied.com
InsTallaTIon
MQTHI5 Single Duct Terminal Units
with Electric Heat
DANGER
Electric shock hazard. Can cause personal injury or
equipment damage.
This equipment must be properly grounded. Connections and
service to the MicroTech III Chiller Unit Controller must be
performed only by personnel knowledgeable in the operation
of the equipment being controlled.
• Always inspect the electric coils for damage prior to
installing the single duct unit.
• All electric heaters if provided by Daikin are balanced
by kW per stage. The installing electrician should rotate
these heater stages by phase in order to help balance the
building electric load.
• See above wiring instructions.
• The “up” orientation must be followed.
MQTHI5 Single Duct Terminal Units
with Hot Water Coils
• Always inspect the hot water coils for damage prior to
installing the single duct unit.
• CAUTION: The copper tubing should not be used as lift
points.
• The hot water coil casing is eld insulated.
• The hot water coils do not have a drip pan and are not
suitable for use as cooling coils.
Controls
CAUTION
Static sensitive components. Can cause equipment
damage.
Discharge any static electrical charge by touching the bare
metal inside the control panel before performing any service
work. Never unplug cables, circuit board terminal blocks, or
power plugs while power is applied to the panel.
IMPORTANT
Units with digital controls, if factory programmed, incorporate
specic communication addresses. Installing the terminal in a
different location than noted on unit label and building plans
may result in excessive start-up labor.
Detailed information regarding connection, start-up and
operating procedures for controls provided by Daikin
are available from your local Daikin representative. For
information on controls by other manufacturers, contact that
manufacturer’s local branch or dealer.
Labeling
MQTHI5 Single Duct Air Terminals are shipped from the factory
with up to seven different information labels (not all labels
pertain to all single duct units depending upon the type of
insulation and the nal ship to state).
1. Control Label – afxed to the single duct terminal casing.
Shows piping/wiring diagram and control sequence
number and fusing (if applicable).
2. Calibration Label – afxed to the single duct terminal
casing. Shows air ow calibration data and control
settings (if applicable).
3. I.D. Label – afxed to the single duct terminal casing.
Shows tagging information, customer order number, ETL
Logo, etc.
4. AHRI Certication Label on Single Duct Terminal Unit –
identies applicable industry test standard and certies
unit is in compliance.
5. AHRI Certication Label on Hot Water Coils – identies
applicable industry test standard and certies hot water
coil compliance (if hot water coils is ordered as an
accessory).
6. Fiberglass Label – identies insulation type for units
shipped to California.
7. Orientation label – identies the proper air ow direction
and the top of the unit.
MQTHI5 Flow Sensor
MQTHI5 Single Duct Air Terminals are shipped with a factory-
installed pressure differential ow sensor installed. See Figure
3, for the calibration curve.

TroubleshooTIng
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TroubleshooTIng
Investigating Noise Complaints
Noise from a terminal can be due to a variety of conditions, and
can be difcult to eliminate. The rst step is to isolate the type,
source and direction. Generally, noise heard at the air outlet is
considered a discharge type. Noise heard through the ceiling is
considered a radiated noise. For detailed information concerning
noise transmission in buildings see ARI Standard 885-2008E,
titled Procedure For Estimating Occupied Space Sound Levels
In The Application Of Air Terminals and Air Outlets.
Discharge Noise
Discharge noise is usually caused by high static or little
to no internal duct lining downstream of the terminal. It
can sometimes be caused by the air outlet itself. Air outlet
generated sounds can be reduced by reducing ow or
increasing air outlet size. Reducing static pressure, or ow, or
adding additional attenuation materials will reduce discharge
sounds from the terminal unit. Sometimes, moving the ex duct
between the terminal and air outlet so the air must make an
additional turn will help with the discharge sound.
Radiated Noise
Radiated noise is most commonly associated with fan powered
terminal units.
Controls
DANGER
Electric shock hazard. Can cause personal injury or
equipment damage.
This equipment must be properly grounded. Connections and
service to the MicroTech III Chiller Unit Controller must be
performed only by personnel knowledgeable in the operation
of the equipment being controlled.
CAUTION
Static sensitive components. Can cause equipment
damage.
Discharge any static electrical charge by touching the bare
metal inside the control panel before performing any service
work. Never unplug cables, circuit board terminal blocks, or
power plugs while power is applied to the panel.
Contact your Daikin representative for information concerning
controls provided by Daikin. For controls provided by others,
contact the local control representative for assistance.
Electric Duct Heater
DANGER
Electric shock hazard. Can cause personal injury or
equipment damage.
This equipment must be properly grounded. Connections and
service to the MicroTech III Chiller Unit Controller must be
performed only by personnel knowledgeable in the operation
of the equipment being controlled.
• If the heater does not operate:
—Check electric power into the unit, and verify that the
wiring agrees with the label diagram located on the
terminal unit casing.
—Verify that the unit is installed properly (i.e., according
to the air ow orientation label). Review the wiring
diagram supplied with the heater to verify the eld
wiring is correct and of the proper gauge and that the
heater is properly grounded.
• If the heater cycles on and off:
—Verify that the airow is uniformly distributed across
the face of the heater. Check for obstructions in
the duct, or insufcient air ow (CFM) (see label for
minimum CFM).
• If conditioned space fails to warm-up:
—Make certain that the heater controls and the
thermostat are compatible and wired properly.
Relocate the thermostat if it is located in a position
that is too warm.
• If conditioned space overheats:
—Make certain that the heater controls and the
thermostat are compatible and wired properly.
Relocate the thermostat if it is located in a position
that is too cool. Verify that the air distribution to the
space is appropriate for the required thermal load.

IM 1093-1 • SINGLE DUCT VAV TERMINALS 8 www.DaikinApplied.com
TroubleshooTIng
Specic Electric Heat Troubleshooting Procedures:
WARNING
On all troubleshooting that requires you to work inside the
heater wiring casing, disconnect power rst! Jumpers are
used for diagnostic purposes only – remove all jumpers prior
to returning unit to operation.
Possible Cause Solution
Power not properly connected to the heater.
With a voltmeter, check the power wiring terminals to insure the proper voltage is available to the
element side of the power terminal block or to the eld side of the disconnect switch, power fusing,
or circuit breakers. If proper voltage is not present, check the terminal studs for proper wiring and
check the power source for power.
Disconnect switch, toggle switch, or circuit breaker set to OFF Set switch circuit breakers to the ON position.
Power fuses are blown or circuit breakers have tripped.
Replace fuses with the same type and amperage as those provided with the heater, or reset circuit
breaker by rst setting the breaker to the OFF position, and then resetting it to the ON position.
With an ammeter, check amperage draw on the power lines. For heaters with fusing, amperage
draw should not exceed the fuse. For heaters with circuit breakers, amperage should not exceed
the rated value. If the amperage draw is excessive, check the power supply as described above
for proper voltage. If the fuse/circuit breaker trips upon application of power, check for a short. If
no short is present and the power supply wiring/voltage is correct, contact the factory for further
assistance.
Manual reset switch has been tripped. Push manual reset button. Manual reset is usually located in the control cabinet near the bottom of
the been tripped. element header.
Air static switch is not engaging.
Jumper out the air static switch by connecting the lead attached to the normally open stud, to the
normally closed stud. If heater operates, the problem may be the air static switch. Disconnect the
pneumatic tubing from the pitot tube located in the control cabinet. Attach a magnehelic gauge to
the pitot tube. Available static pressure at the pitot tube should be <= -0.03" S.P. or >= +0.03" S.P.
If the available static pressure is in the dead band between these two ranges, the switch will not
engage and some method must be devised to increase the available static pressure. If sufcient
static pressure is available, check to insure the pneumatic tube is connected to the correct port of
the switch. For negative pressure, connect to the low port. For positive pressure, connect to the
high port. If the air static switch still fails to operate, contact the factory for a replacement switch.
Automatic reset switch bad.
Allow the duct temperature to cool below 90°F. If the heater does not operate, jumper out the
automatic reset switch. If the heater now operates, contact the factory for a replacement switch.
Manual reset switch Allow the duct temperature to cool below 90°F. If the heater does not operate,
do the following:
• On heaters with the manual reset installed in the power wiring, jumper out the manual reset
switch. If the heater now operates, contact the factory for a replacement switch.
• On heaters with the manual reset located in the backup contactor circuit, jumper out the manual
reset switch. If the backup contactor now engages, contact the factory for a replacement switch.
If the backup contactor fails to operate, the problem is in the backup contactor holding coils. Use
an ohmmeter to check the continuity of the holding coils. Contact the factory for a replacement of
any contactor with faulty holding coils.
Step controller malfunction.
Jumper out each step of the step controller. If contactor engages, the trouble is in the step
controller. Refer to the literature provided with the step controller for proper power and wiring. If
wiring appears to be correct, contact the factory for assistance.
SCR controller malfunction.
Refer to the literature provided with the SCR controller for proper power and wiring. If wiring
appears to be correct, contact the factory for assistance. Possible: Nuisance Tripping of Reset
Switchs
Insufcient air ow across the heating elements
The minimum allowable air ow across the heating coils is 70 CFM/kW. Unless this minimum air
ow is met, the leaving air temperature will be greater than the set point of the high temperature
limit switches. This will cause nuisance tripping of the reset switches. Reset the minimum air ow
across the coils to the minimum listed value. If further assistance is needed, contact the factory

TroubleshooTIng
www.DaikinApplied.com 9 IM 1093-1 • SINGLE DUCT VAV TERMINALS
Figure 3: MI Flow Sensor Calibration Chart

IM 1093-1 (02/15) ©2015 Daikin Applied | (800) 432–1342 | www.DaikinApplied.com
Daikin Applied Training and Development
Now that you have made an investment in modern, efcient Daikin equipment, its care should be a high
priority. For training information on all Daikin HVAC products, please visit us at www.DaikinApplied.com
and click on Training, or call 540-248-9646 and ask for the Training Department.
Warranty
All Daikin equipment is sold pursuant to its standard terms and conditions of sale, including Limited
Product Warranty. Consult your local Daikin Applied representative for warranty details. To nd your
local Daikin Applied representative, go to www.DaikinApplied.com.
Aftermarket Services
To nd your local parts ofce, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787).
To nd your local service ofce, visit www.DaikinApplied.com or call 800-432-1342.
This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.DaikinApplied.com.
Products manufactured in an ISO Certied Facility.