Enviro VFC, VFE, VFS Installation & Operation Manual

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SERIES B VERTICAL FLOOR

B Y JOHNSON C O NTROL S

FAN COIL UNIT

InstallatIon, operatIon & MaIntenance

New Release

MODEL VFC/VFE/VFS

Form ET115.24-NOM9 (908)

FORM ET115.24-NOM9 (908)

TABLE OF CONTENTS

TABLE OF CONTENTS .................................................................................................................2

SAFETY SYMBOLS ......................................................................................................................3

SAFETY CONSIDERATIONS ........................................................................................................4

SECTION 1 - RECEIPT & INITIAL INSTALLATION ......................................................................5

VF SERIES B FEATURES ......................................................................................................................5

PREFACE ................................................................................................................................................5

UNPACKING & INSPECTION ...............................................................................................................6

HANDLING & INSTALLATION ..............................................................................................................6

COOLING/HEATING MEDIUM CONNECTIONS ...................................................................................7

DUCTWORK CONNECTIONS ...............................................................................................................9

ELECTRICAL CONNECTIONS .............................................................................................................9

SECTION 2 - START-UP .............................................................................................................10

GENERAL ............................................................................................................................................10

COOLING/HEATING SYSTEM ............................................................................................................10

AIR SYSTEM BALANCING .................................................................................................................10

WATER SYSTEM BALANCING ..........................................................................................................10

CONTROLS OPERATION ...................................................................................................................11

MOTOR AND FAN DATA ......................................................................................................................11

EXAMPLE WIRING DIAGRAMS ..........................................................................................................12

SECTION 3 - NORMAL OPERATION & PERIODIC MAINTENANCE ........................................14

GENERAL ............................................................................................................................................14

MOTOR/BLOWER ASSEMBLY ...........................................................................................................14

COIL .....................................................................................................................................................14

ELECTRIC RESISTANCE HEATER ASSEMBLY ................................................................................14

FAN DECK ............................................................................................................................................14

ELECTRICAL WIRING & CONTROLS ................................................................................................14

VALVES & PIPING ................................................................................................................................15

FILTERS, THROWAWAY .....................................................................................................................15

REPLACEMENT PARTS .....................................................................................................................15

FALSE BACK ASSEMBLY ...................................................................................................................16

SUB BASE ASSEMBLY AND LEVELING LEGS .................................................................................17

SECTION 4 - INSPECTION, INSTALLATION & START-UP CHECKLIST ..................................18

SECTION 5 - DIMENSIONAL DRAWINGS..................................................................................19

MODEL VFC - CONCEALED FAN COIL UNIT ....................................................................................19

MODEL VFE - EXPOSED FAN COIL UNIT W/ STAMPED SUPPLY GRILLE .....................................20

MODEL VFS - EXPOSED SLOPE TOP FAN COIL UNIT W/ STAMPED SUPPLY AIR GRILLE ........21

MODEL VF - OUTSIDE AIR INLET LOCATION ...................................................................................22

MODEL VFC - STANDARD DECORATOR WALL PANEL W/ STAMPED

RETURN AIR GRILLE ..........................................................................................................................23

MODEL VFC - STANDARD DECORATOR WALL PANEL W/ STAMPED

SUPPLY & RETURN AIR GRILLE ........................................................................................................24

MODEL VF - OUTSIDE AIR WALL BOX ASSEMBLY .........................................................................25

MODEL VFE/VFS - STAMPED LOUVER RETURN AIR GRILLE ........................................................26

MODEL VFE - EXPOSED FAN COIL UNIT W/ STAMPED SUPPLY GRILLE &

10” END POCKET EXTENSION ..........................................................................................................27

MODEL VF - ELECTRIC ENTRY & PIPING WALL PENETRATION LOCATIONS .............................28

JOHNSON CONTROLS

FORM ET115.24-NOM9 (908)

SAFETY SYMBOLS

The following symbols are used in this document to alert the reader to areas of potential hazard:

DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION identies a hazard which could lead to damage to the machine, damage to other equipment and/or environmental pollution. Usually an instruction will be given, together with a brief explanation.

NOTE is used to highlight additional information which may be helpful to you.

JOHNSON CONTROLS

SAFETY CONSIDERATIONS

FORM ET115.24-NOM9 (908)

The equipment covered by this manual is designed for safe and reliable operation when installed and operated

within its design specication limits. To avoid personal

injury or damage to equipment or property while installing or operating this equipment, it is essential

that qualied, experienced personnel perform these functions using good judgment and safe practices. See

the following cautionary statements.

ELECTRICAL SHOCK HAZARDS. All power must be disconnected prior to installation and serving this equipment. More than one source of power may be present. Disconnect all power sources to avoid electrocution or shock injuries.

MOVING PARTS HAZARDS. Motor and Blower must be disconnected prior to opening access panels. Motors can start automatically, disconnect all power and control circuits prior to servicing to avoid serious crushing or dismemberment injuries.

HOT PARTS HAZARDS. Electric Resistance heating elements must be disconnected prior to servicing. Electric Heaters may start automatically, disconnect all power and control circuits prior to servicing to avoid burns.

All assemblies must be adequately secured during lifting and rigging by temporary supports and restraints until equipment is permanently fastened and set in its nal location.

All unit temporary and permanent supports must be capable of safely supporting the equipment’s weight and any additional live or dead loads that may be encountered. All supports must be designed to meet applicable local codes and ordinances.

All fastening devices must be designed to mechanically lock the assembly in place without the capability of loosening or breaking away due to system operation and vibration.

Secure all dampers when servicing damper, actuator or linkages. Dampers may activate automatically, disconnect control circuits or pneumatic control systems to avoid injury.

Protect adjacent ammable materials when brazing, Use ame and heat protection barriers where needed. Have re extinguisher available and ready for immediate use.

Check that the unit assembly and component weights can be safely supported by rigging and lifting equipment.

JOHNSON CONTROLS

FORM ET115.24-NOM9 (908)

(Provided with unit mounted t-stat)

SECTION 1 - RECEIPT & INITIAL INSTALLATION

VF SERIES B FEATURES

PREFACE

ENVIRO-TEC® fan coils represent a prudent investment

which can, with proper installation, operation, and regular maintenance, give trouble-free operation and

long service.

Your equipment is initially protected under the manufacturer’s standard warranty; however, this warranty is provided under the condition that the steps outlined in this manual for initial inspection, proper installation, regular periodic maintenance, and everyday

operation of the equipment be followed in detail. This

manual should be fully reviewed in advance of any

actual work being done on the equipment. Should any questions arise, please contact your local Sales Representative or the factory BEFORE proceeding.

LD13943

The equipment covered by this manual is available with

a vast variety of options and accessories. Consult the

approved unit submittal, order acknowledgement, and other manuals for details on the options and accessories

provided with the equipment on each project.

No attempt should be made to handle, install, or service any unit without following safe practices regarding mechanical equipment.

JOHNSON CONTROLS

FORM ET115.24-NOM9 (908)

All power must be disconnected before any installation or service should be attempted. More than one power source may be supplied to a unit. Power to remote mounted control devices may not be supplied through the unit.

Never wear bulky or loose tting clothing when working on any mechanical equipment. Gloves should only be worn when required for proper protection from heat or other possible injury. Safety glasses or goggles should always be worn when drilling, cutting, or working with chemicals such as refrigerants or lubricants.

Never pressurize any equipment beyond specied operating pressures. Always pressure test with some inert uid or gas such as clear water or dry nitrogen to avoid possible damage or injury in the event of a leak or component failure during testing.

Always protect adjacent flammable material when welding or soldering. Use suitable heat shield material to contain sparks or drops of solder. Have re extinguisher available for use when welding or brazing.

The manufacturer assumes no responsibility for personal injury or property damage resulting from improper or unsafe practices during the handling, installation,

service, or operation of any equipment.

UNPACKING & INSPECTION

All units are carefully inspected at the factory throughout the manufacturing process under a strict detailed quality assurance program, and where possible, all major components and subassemblies are carefully tested for

proper operation and veried to be in full compliance with the factory manufacturing documents. Customer

furnished components such as control valves, switches

and DDC controls are not factory tested.

Each unit is carefully packaged for shipment to avoid

damage during normal transport and handling. The

equipment should always be stored in a dry place in the

proper orientation as marked on the carton.

All shipments are made F.O.B. factory and it is the

responsibility of the receiving party to inspect the

equipment upon arrival. Any obvious damage to the

carton and/or its contents should be recorded on the bill

of lading and a claim should be led with the freight carrier.

After determining the condition of the carton exterior,

carefully remove each unit from the carton and inspect

for hidden damage. At this time check to make sure that

“furnished only” items such as switches, thermostats,

etc. are accounted for. Any hidden damage should be

recorded and immediately reported to the carrier and a

claim led as before. In the event a claim for shipping damage is led, the unit, shipping carton, and all packing

must be retained for physical inspection by the freight

carrier.

All equipment should be stored in the factory-shipping

carton with internal packing in place until installation.

At the time of receipt, the equipment type and arrangement should be verified against the order

documents. Should any discrepancy be found, the local Sales Representative should be notied immediately so that the proper action may be instituted. Should

any question arise concerning warranty repairs, the factory must be notified BEFORE any corrective

action is taken. Where local repairs or alterations can

be accomplished, the factory must be fully informed as

to the extent and expected cost of those repairs before work is begun. Where factory operations are required,

the factory must be contacted for authorization to return equipment and a Return Authorization Number will be

issued. Unauthorized return shipments of equipment

and shipments not marked with an authorization number

will be refused. In addition, the manufacturer will not accept any claims for unauthorized expenses.

HANDLING & INSTALLATION

While all equipment is designed for durability and

fabricated for sturdy construction and may present a rugged appearance, great care must be taken to assure that no force or pressure be applied to the coil, piping

or drain stub-outs during handling. Also, depending

on the options and accessories, some units could contain delicate components that may be damaged by

improper handling. Wherever possible, all units should

be maintained in an upright position and handled by the chassis as close as possible to the mounting point

locations.

JOHNSON CONTROLS

FORM ET115.24-NOM9 (908)

In the case of a full cabinet unit, the unit must obviously

be handled by the exterior casing. This is acceptable

providing the unit is again maintained in an upright position and no impact forces are applied that may

damage internal components or painted surfaces. The equipment covered in this manual IS NOT suitable for outdoor installations. The equipment should never

be stored or installed where it may be subjected to a

hostile environment such as rain, snow, or extreme temperatures.

During and after installation, special care must be taken to prevent foreign material such as paint, plaster, and drywall dust from being deposited in the drain pan or

on the motor or blower wheels. Failure to do so may

have serious adverse effects on unit operation and in the case of the motor and blower assembly, may result

in immediate or premature failure. All manufacturers’

warranties are void if foreign material is deposited on

the motor or blower wheels of any unit. Some units and/

or job conditions may require some form of temporary

covering during construction.

While the manufacturer does not become involved

in the design and selection of support methods and components, it should be noted that unacceptable system operating characteristics and/or performance may result from improper or inadequate unit structural

support. In addition, adequate clearance must be

provided for service and removal of the equipment and

its accessory components. Anchoring the equipment in

place is accomplished by using the mounting points provided and positioning the unit to maintain the unit

on a LEVEL plane. The drain pan is internally sloped toward the outlet connection. Care must be taken to

insure that the unit drain pan does not slope away from

the outlet connection.

The unit's drain pan is factory sloped toward the drain connection when the unit is installed level and plumb.

If equipped with optional leveling legs, the legs can be adjusted with a wrench before anchoring the unit

in place.

The type of mounting device is a matter of choice, however the mounting point should always be that

provided in the chassis, or cabinet. Refer to the unit product drawing for mounting hole location and sizes.

If equipped with optional falseback spacers or subbases,

these accessories must rst be assembled and mounted to the unit before anchoring.

After mounting the unit, it is then ready for the various

service connections such as water, drain and electrical. At this time it should be veried that the proper types of service are actually provided to the unit.

On those units requiring chilled water and/or hot water, the proper line size and water temperature should be

available to the unit. In the case of refrigerant cooling,

the proper line size and refrigerant type should be

available at the unit. The auxiliary drain pan is shipped loose for eld installation. See the Auxiliary Drain Pan

Installation Details for instructions (next page). On units with steam heating coils, the proper line sizing

and routing should be veried and the maximum steam pressure applied to the unit should never exceed 15 psig. The drain piping and steam trap should be sized and routed to allow for proper condensate ow. The

electrical service to the unit should be compared to

the unit nameplate to verify compatibility. The routing

and sizing of all piping, and the type and sizing of all wiring and other electrical components such as circuit

breakers, disconnect switches, etc. should be determined

by the individual job requirements and should not be based on the size and/or type of connection provided

on the equipment. All installations should be made in compliance with all governing codes and ordinances. Compliance with all codes is the responsibility of the installing contractor.

Vertical units are designed to be oor mounted or

otherwise supported from below and bolted to the wall structure through the mounting holes provide in the

chassis. Vertical concealed units are designed to be oor mounted or otherwise supported from below and may be anchored directly through the cabinet back. Units with leveling legs must be anchored through the cabinet back.

JOHNSON CONTROLS

COOLING/HEATING MEDIUM CONNECTIONS

Toxic residues and loose particles resulting from manufacturing and eld piping techniques such as joint compounds, soldering ux, and metal shavings may be present in the unit and the piping system. Special consideration must be given to system cleanliness when connecting to solar, domestic or potable water systems.

FORM ET115.24-NOM9 (908)

UPPER SUPPORT TABS

FLOAT SWITCH MOUNT

SEE NOTE 4

LOWER SUPPORT

TABS

SECTION A-A

NOTE: INSTALLING CONTRACTOR MUST ASSURE THAT THE CONNECTED DRAIN PIPING MAINTAINS THE PROPER PAN ORIENTATION.

NOTES:

1. BEND LOWER SUPPORT TABS DOWN 90º.

2. BEND UPPER SUPPORT TABS UP 90º.

3. POSITION DRAIN PAN IN PLACE AND THEN BEND UPPER SUPPORT TABS DOWN UNTIL PAN IS SECURE.

4. BEND FLOAT SWITCH MOUNT OUT 90º IF NEEDED.

5. STANDARD PAN SHOWN, TYPICAL FOR EXTENDED PAN.

Submittals and Product Catalogs detailing unit operation,

controls, and connections should be thoroughly reviewed BEFORE beginning the connection of the

various cooling and/or heating mediums to the unit. All documentation may be found at www.enviro-tec.com.

All accessory valve packages should be installed as required, and all service valves should be checked for

proper operation.

If coil and valve package connections are to be made with “sweat” or solder joint, care should be taken to assure that no components in the valve package are subjected to a high temperature which may damage seals

or other materials. Many two-position electric control

valves, depending on valve operation, are provided with

a manual-opening lever. This lever should be placed

in the “open” position during all soldering or brazing

operations. Valve bodies should be wrapped with a wet rag to help dissipate heat encountered during brazing.

If the valve package connection at the coil is made with a union, the coil side of the union must be prevented from twisting (“backed up”) during tightening to prevent

damage to the coil tubing. Over-tightening must be

avoided to prevent distorting the union seal surface and

destroying the union.

In the case of eld installed valves and piping, the chilled water valve cluster (or expansion valve on DX

units) should be installed in such a way that any dripping

or sweating is contained in the auxiliary drain pan or other device.

After the connections are completed, the system should

then be tested for leaks. Since some components are not

designed to hold pressure with a gas, hydronic systems

should be tested with water.

All water coils must be protected from freezing after initial lling with water. Even if the system is drained, unit coils may still hold enough water to cause damage when exposed to temperatures below freezing.

Refrigerant systems should be tested with dry nitrogen rather than air to prevent the introduction of moisture

into the system. In the event that leaking or defective components are discovered, the Sales Representative must be notied BEFORE any repairs are attempted.

All leaks should be repaired before proceeding with

the installation.

LD13944

JOHNSON CONTROLS

FORM ET115.24-NOM9 (908)

After system integrity has been established the piping should be insulated in accordance with the project

specications. ALL chilled water piping and valves or

refrigerant suction piping not located over drain pans

must be insulated to prevent damage from sweating. This includes factory and eld piping inside the unit cabinet.

The drain should always be connected and piped to an

acceptable disposal point. For proper moisture carry-

off, the drain piping should be sloped away from the

unit at least 1/8" per foot. A drain trap may be required

by local codes and it is strongly recommended for odor

containment.

DUCTWORK CONNECTIONS

All ductwork and/or supply and return grilles should be installed in accordance with the project plans and

specications. If not included on the unit or furnished

from the factory, supply and return grilles should be

provided as recommended in the product catalog.

All units must be installed in non-combustible areas.

Some models are designed to be connected to duct-work with a MINIMUM amount of external static pressure.

These units may be damaged by operation without the

proper ductwork connected. Consult the approved submittals and the product catalog for unit external static pressure limitations.

Units provided with outside air for ventilation should

have some form of low temperature protection to

prevent coil freeze-up.

It should be noted that none of these methods would

adequately protect a coil in the event of power failure.

The safest method of freeze protection is to use glycol

in the proper percent solution for the coldest expected air temperature.

ELECTRICAL CONNECTIONS

The unit nameplate lists the unit electrical characteristics such as the required supply voltage, fan and heater

amperage and required circuit ampacities. The unitwiring diagram shows all unit and eld wiring. Since

each project is different and each unit on a project may be different, the installer must be familiar with the wiring diagram and nameplate on the unit BEFORE

beginning any wiring. All components furnished for eld installation, by either the factory or the controls

contractor should be located and checked for proper

function and compatibility. All internal components

should be checked for shipping damage and all electrical connections should be tightened to minimize problems

during start-up.

Any devices such as fan switches or thermostats

that have been furnished from the factory for eld

installation must be wired in strict accordance with the

applicable wiring diagrams. Failure to do so could result

in personal injury or damage to components and will

void all manufacturers’ warranties.

The fan motor(s) should never be controlled by any wiring or device other than the factory furnished switch, thermostat/switch combination, without factory

authorization.

All eld wiring should be done in accordance with governing codes and ordinances. Any modication of

the unit wiring without factory authorization will result in voiding of all factory warranties and will nullify any

agency listings.

The manufacturer assumes no responsibility for any

damages and/or injuries resulting from improperly eld installed or wired components.

The manufacturer assumes no responsibility for undesir able sy stem op eration due to improper design, equipment or component selection, and/or

installation of ductwork, grilles, and other eld supplied components.

JOHNSON CONTROLS

SECTION 2 - START-UP

GENERAL

Before beginning any start-up operation, the startup personnel should familiarize themselves with the unit, options and accessories, and control sequence to

understand the proper system operation. All personnel

should have a good working knowledge of general start-up procedures and have the appropriate start-up

and balancing guides available for consultation.

The initial step in any startup operation should be a nal visual inspection. All equipment, plenums, duct-work,

and piping should be inspected to verify that all systems are complete and properly installed and mounted, and that no debris or foreign articles such as paper or drink

cans are left in the units or other areas. Each unit should

be checked for loose wires, free blower wheel operation,

and loose or missing access panels or doors. Except as

required during start-up and balancing operations, no fan coil units should be operated without all the proper ductwork attached, supply and return grilles in place,

and all access doors and panels in place and secure. A clean lter of the proper size and type must also be installed. Failure to do so could result in damage to the

equipment or building and furnishings, and/or void all

manufacturers’ warranties.

COOLING/HEATING SYSTEM

Prior to the water system start-up and balancing, the chilled/hot water systems should be ushed to clean

out dirt and debris, which may have collected in the

piping during construction. During this procedure, all unit service valves must be in the closed position.

This prevents foreign matter from entering the unit and

clogging the valves and metering devices. Strainers

should be installed in the piping mains to prevent this material from entering the units during normal

operation.

FORM ET115.24-NOM9 (908)

The air vent provided on the unit is not intended to replace the main system air vents and may not release air trapped in other parts of the system. Inspect the entire system for potential air traps and vent those areas as required, independently. In addition, some systems may require repeated venting over a period of time to properly eliminate air from the system.

AIR SYSTEM BALANCING

All ductwork must be complete and connected, and all

grilles, lters, access doors and panels must be properly

installed to establish actual system operating conditions

BEFORE beginning air balancing operations.

Each individual unit and attached ductwork is a unique

system with its own operating characteristics. For this

reason, balance specialists who are familiar with all procedures required to properly establish air distribution and fan system operating conditions normally do air

balancing. Unqualied personnel should not attempt these procedures. Exposed units with no ductwork do

not require air balancing other than selecting the desired

fan speed.

After the proper system operation is established, the actual unit air delivery and the actual fan motor amperage draw for each unit should be recorded in a convenient place for future reference such as the inspection, installation, & start-up check sheet, a copy

of which is provided at the back of this manual. Contact the Sales Representative or the factory for additional copies of this sheet.

During system filling, air venting from the unit is accomplished by the use of the standard, manual or

optional automatic air vent tting installed on the coil. In the case of the manual air vent tting, the screw should be turned counterclockwise no more than 1-1/2 turns to operate the air vent. Automatic air vents may

be unscrewed one turn counterclockwise to speed initial venting but should be screwed in for automatic venting

after start-up operations.

WATER SYSTEM BALANCING

A complete knowledge of the hydronic system, its components, and controls is essential to proper water system balancing and this procedure should not be

attempted by unqualied personnel. The system must

be complete and all components must be in operating condition BEFORE beginning water system balancing

operations.

JOHNSON CONTROLS

FORM ET115.24-NOM9 (908)

Each hydro nic system has d ifferent op erating characteristics depending on the devices and controls

in the system. The actual balancing technique may vary from one system to another.

After the proper system operation is established, the

CONTROLS OPERATION

Before proper control operation can be veried all other systems must be in proper operation. The correct water

and air temperatures must be present for the control

function being tested. Some controls and features are designed to not operate under certain conditions.

appropriate system operating conditions such as various

water temperatures and ow rates should be recorded

in a convenient place for future reference such as the inspection, installation, & start-up check sheet, a copy

of which is provided on the back of this manual. Contact the Sales Representative or the factory for additional copies of this sheet.

A wide range of controls and electrical options and accessories may be used with the equipment covered

in this manual. Consult the approved unit submittals,

order acknowledgement, and other manuals for detailed information regarding each individual unit and its

controls. Since controls and features may vary from

one unit to another, care should be taken to identify

Before and during water system balancing, conditions

may exist which can result in noticeable water

noise or undesired valve operation due to incorrect

system pressures. After the entire system is balanced, these conditions will not exist on properly designed

the controls to be used on each unit and their proper

control sequence. Information provided by component

manufacturers regarding installation, operation, and maintenance of their individual controls is available

upon request.

systems.

MOTOR AND FAN DATA

UNIT SIZE

NOTES:

1. Motor electrical data is nameplated data. Actual data will vary with application.

2. 230 volt motor is nameplated for 208-230/1/60. Use 230 volt motor data for 208 volt applications.

3. Unit size 30, 208-230 and 277 volt motors are 1/12 HP at high tap.

FAN

SPEED

High (1) 1/30

Medium (1) 1/50 0.4 39 0.3 49 0.3 48

Low (1) 1/60 0.3 33 0.3 43 0.3 41

High (1) 1/15

Medium (1) 1/30 0.9 90 0.3 80 0.3 80

Low (1) 1/60 0.5 60 0.2 60 0.2 60

High (1) 1/10

Medium (1) 1/30 0.8 76 0.3 75 0.5 65

Low (1) 1/60 0.5 47 0.2 54 0.4 41

High (1) 1/6

Medium (1) 1/12 1.5 162 0.5 171 0.5 152

Low (1) 1/40 0.8 75 0.4 79 0.3 74

High

Medium

Low

High (1) 1/6

Medium (1) 1/12 3.0 324 1.0 342 1.0 304

Low (1) 1/40 1.2 150 0.6 158 0.6 148

MOTOR

H.P.

(QTY.)

(1) 1/8

(1) 1/6 2.5 257 1.4 233 1.0 255

(1) 1/15 1.3 145 0.6 109 0.5 132

(1) 1/12 1.5 156 0.5 106 0.5 151

(1) 1/40 0.3 69 0.3 63 0.3 86

(1) 1/40 0.6 75 0.3 62 0.3 84

# OF

FANS

115VOLTS 208-230 VOLTS 277 VOLTS

AMPS WATTS AMPS WATTS AMPS WATTS

0.8 57 0.6 77 0.3 71

1.1 125 0.5 120 0.5 120

1.9 165 0.8 158 0.8 162

2.5 261 1.4 284 1.0 254

1.7 215 0.9 216 0.8 214

5.0 522 2.8 568 2.0 508

JOHNSON CONTROLS

FORM ET115.24-NOM9 (908)

EXAMPLE WIRING DIAGRAMS

"Example Wiring Diagram - Typical 24 VAC Control Drawing (Refer to unit control enclosure for actual order-specic drawing)"

84-10-0615-REV05

JOHNSON CONTROLS

FORM ET115.24-NOM9 (908)

EXAMPLE WIRING DIAGRAMS (Continued)

"Example Wiring Diagram - Typical 24 VAC Control Drawing (Refer to unit control enclosure for actual order-specic drawing)"

JOHNSON CONTROLS

84-10-0205-REV05

FORM ET115.24-NOM9 (908)

SECTION 3 - NORMAL OPERATION & PERIODIC MAINTENANCE

GENERAL

Each unit on a job will have its own unique operating environmen t and conditions that may dictate a maintenance schedule for that unit that is different

from other equipment on the job. A formal schedule of

regular maintenance and an individual unit log should

be established and maintained. This will help to achieve the maximum performance and service life of each unit on the job.

Information regarding safety precautions contained in the preface at the beginning of this manual should be followed during any service and maintenance operations.

For more detailed information concerning service

operations, consult your Sales Representative or the Factory.

MOTOR/BLOWER ASSEMBLY

The type of fan operation is determined by the control components and their method of wiring, and may vary

from unit to unit. Refer to the wiring diagram for each unit for that unit’s individual operating characteristics.

Motors are permanently lubricated, PSC type and do not require eld lubrication.

ELECTRIC RESISTANCE HEATER ASSEMBLY

Electric resistance heaters typically require no normal

periodic maintenance when unit air lters are changed properly. Other conditions and equipment may affect the operation and service life in the system. The two most

important operating conditions for an electric heater are

proper airow and proper supply voltage. High supply voltage and/or poorly distributed or insufcient airow over the element will result in element overheating. This

condition may result in the heater cycling on the high limit thermal cutout

Sheathed type heaters provided have an automatic reset switch with a back-up high limit thermal switch.

Automatic reset switches are as the name implies; they

reset automatically after the heater has cooled down. High limit thermal switches must be replaced once the circuit has been broken. The high limit thermal cutout

device is a safety device only and is not intended for

continuous operation. With proper unit application and

during normal operation, the high limit thermal cutout

will not operate. This device only operates when some problem exists and ANY condition that causes high limit cutout MUST be corrected immediately. High supply voltage also causes excessive amperage draw and may

result in tripping of the circuit breaker or blowing of

the fuses on the incoming power supply.

Should the assembly require more extensive service,

the motor/blower assembly may be removed from the unit to facilitate such operations as motor or blower

wheel/housing replacement, etc. Dirt and dust should

not be allowed to accumulate on the blower wheel or

housing. This can result in an unbalanced blower wheel condition that can damage a blower wheel or motor.

The wheel and housing may be cleaned periodically using a vacuum cleaner and a brush taking care not to dislodge the factory balancing weights on the blower

wheel blades.

COIL

Coils may be cleaned in place by removing the motor/

blower assemblies and brushing the entering air face

between ns with a stiff brush. Cleaning with a vacuum cleaner should follow brushing. If a compressed air

source is available, the coil may also be cleaned by blowing air through the coil fins from the leaving

air face. Vacuuming should again follow this. Units provided with the proper type of air lters, replaced regularly, will require coil cleaning.

FAN DECK

The fan/drain pan assembly is easily removable for service access to motors and blowers at, or away from,

the unit.

ELECTRICAL WIRING & CONTROLS

The electrical operation of each unit is determined by the components and wiring of the unit and may vary

from unit to unit. Consult the wiring diagram for the

actual type and number of controls provided on each

unit. The integrity of all electrical connections should be veried at least twice during the rst year of operation.

Afterwards, all controls should be inspected regularly

for proper operation. Some components may experience erratic operation or failure due to age. Wall thermostats

may also become clogged with dust and lint and should be periodically inspected and cleaned to provide reliable

operation.

JOHNSON CONTROLS

FORM ET115.24-NOM9 (908)

When replacing any components such as fuses, contactors, or relays, use only the exact type, size, and voltage component as furnished from the factory. Any

deviation without factory authorization could result in personnel injury or damage to the unit and will

void all factory warranties. All repair work should be

done in such a manner as to maintain the equipment in compliance with governing codes and ordinances or

testing agency listings.

More specific information regarding the use and

operating characteristics of the standard controls offered

by this manufacturer is contained in other manuals.

VALVES & PIPING

No formal maintenance is required on the valve package components most commonly used with fan coil units other than a visual inspection for possible leaks in the

course of other normal periodic maintenance. In the

event that a valve should need replacement, the same precautions taken during the initial installation to protect

the valve package from excessive heat should also be used during replacement.

FILTERS, THROWAWAY

The type of throwaway lter most commonly used on fan coil units should be replaced on a regular basis.

The time interval between each replacement should

be established based on regular inspection of the lter and should be recorded in the log for each unit. Refer

to the product catalog for the recommended lter size

for each product type and size. If the replacement

lters are not purchased from the factory, the lters

used should be the same type and size as that furnished

from or recommended by the factory. Pleated media or extended surface lters should not be used since the

high air pressure drops encountered with these types

of lters is not compatible with the type of fan coil unit covered in this manual. Consult the factory for applications using lter types other than the factory standard or optional product.

DRAIN

The drain should be checked before initial start-up and at the beginning of each cooling season to assure that the

lines are clear. If it is clogged, steps should be taken to clear the debris so that condensate will ow easily.

Periodic checks of the drain should be made during the cooling season to maintain a free owing condensate. Should the growth of algae and/or bacteria be a concern,

consult an air conditioning and refrigeration supply organization familiar with local conditions for chemicals

available to control these agents.

REPLACEMENT PARTS

Factory replacement parts should be used wherever po ssible to maintain t he unit perfo rmance and

operating characteristics and the testing agency listings.

Replacement parts may be purchased through the local

Sales Representative.

Contact the local Sales Representative or the factory be fore attempting any unit modifications. Any modications not authorized by the factory could result

in personnel injury and damage to the unit and could

void all factory warranties.

When ordering parts, the following information must be supplied to ensure proper part identication:

1. Complete unit model number.

2. Unit hand connection (right or left hand) while facing into the return air stream.

3. Complete part description including any numbers.

On warranty replacements, in addition to the information

previously listed, the project CO # that appears on the unit nameplate, is required. Contact the factory for

authorization to return any parts such as defective parts

replaced in warranty. All shipments returned to the factory MUST be marked with a Return Authorization Number, which is provided by the factory.

JOHNSON CONTROLS

All equipment and components sold through the Parts

Department are warranted under the same conditions as the standard manufacturer's warranty with the

exception that the warranty period is 12 months unless the component is furnished as warranty replacement. Parts furnished as warranty replacements are warranted for the remaining term of the original unit warranties.