Daikin IM 1093-1 Manuale

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

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

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

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

www.DaikinApplied.com 7 IM 1093-1 • SINGLE DUCT VAV TERMINALS

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

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.

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