Enviro Series D, HL SERIES Installation Operation & Maintenance

Download

HORIZONTAL, LOW PROFILE FAN COILS

Series D

INSTALLATION, OPERATION & MAINTENANCE

Supersedes ET115.24-NOM11 (417)

Form ET115.24-NOM11 (118)

TABLE OF CONTENTS

Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Safety Considerations ....................... 1

FORM ET115.24-NOM11 (118)

Section One - Receipt & Initial Installation

HL Series Features.......................... 2

Preface ................................... 3

Unpacking & Inspection ...................... 3

Handling & Installation ....................... 3

Drain Pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Cooling/Heating Medium Connections ........... 6

Auxiliary Drain Pans ......................... 7

Ductwork Connections . . . . . . . . . . . . . . . . . . . . . . . 7

Electrical Connections ....................... 7

Electrical Enclosure ......................... 7

Telescoping Bottom Panel .................... 8

Model HLP Horizontal Fan Coil Optional

Telescoping Bottom Panel Assembly,

Typical Installation Instructions ............. 9

Service & Clearance Requirements ............ 10

Height Restricted Application . . . . . . . . . . . . . . . . . 11

Width Restricted Application..................12

External Space Requirements ................ 13

Section Two - Start-Up

General.................................. 14

Cooling/Heating System.....................14

Air System Balancing ....................... 14

Motor & Fan Data .......................... 15

Water System Balancing .................... 16

Controls Operation ......................... 16

Electric Resistance Heater Assembly........... 18

Electrical Wiring & Controls .................. 18

Valves & Piping............................ 18

Filters, Throwaway ......................... 19

Drain....................................20

Optional Item Installation .................... 21

Condensate Pump ...................... 21

Current Switch Device ................... 21

Di󰀨erentialAirPressureSwitch ............ 22

Discharge Air Sensor .................... 23

Low Temperature Cutout Control ........... 23

Unit Weight Data . . . . . . . . . . . .. ...........24

Condensate Float Switch Installation........ 25

Replacement Parts......................... 26

Section Four - Inspection &

Start-Up Checklist

Inspection & Start-up Checklist ............... 27

Section Five - Fan Relay Board

Installation ............................... 28

Reference Wire Diagram .................... 30

Ratings ..................................31

Tools Needed for Installation/Troubleshooting .... 32

Jumpers ................................. 33

Test Points ............................... 33

Screw Terminal Signals ..................... 34

Checking Wire Harnesses ................... 35

Section Three - Normal Operation &

Periodic Maintenance

General.................................. 17

Motor/Blower Assembly ..................... 17

Fan Deck ................................ 17

Coil .....................................18

Section Six - Troubleshooting

Fan Relay Board........................... 36

PSC Motor ............................... 37

EC Motor ................................ 40

Cooling System ........................... 44

Electric Heat .............................. 45

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

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.

SAFETY CONSIDERATIONS

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 servicing 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.

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.

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

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.

HOT PARTS HAZARD. 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.

ENVIRO-TEC

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

FORM ET115.24-NOM11 (118)

SECTION ONE - RECEIPT & INITIAL INSTALLATION

HL SERIES FEATURES

Controls

Blower

Condensate pump

Electric heat

Supply air

Coils

Motor

Removable drain pan

Outside air duct collar

Return air

Right or left hand coil and drain connections, same or opposite end

Filter access (not shown)

Valve package (factory mounted or shipped loose)

Auxiliary drain pan

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.

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.

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.

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

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, brazing 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 must be led. 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.

CODE COMPLIANCE

This equipment has been manufactured and certied in accordance with UL 1995-Standard for Safety, Heating and Cooling Equipment (CAN/CSA C22.2 NO 236M90) and bears the Electrical Testing Laboratories (ETL) Mark under ETL File No.: 3036742-002.

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.

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, access panels, 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.

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

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 eects 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 allowed to be

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. All units are supplied with integrated hanger

brackets with optional grommet isolators and brass

inserts for use with 3/8" all thread hanger rod.

TYPICAL CEILING INSTALLATION

SIDE VIEW

Figure 1: Typical ceiling installation

The unit’s drain pan is factory sloped toward the

drain connection when the unit is installed level and plumb.

ENVIRO-TEC

DRAIN PAN

Standard drain pans are externally insulated, single wall

galvanized steel and can be equipped with a secondary

drain connection. The HL drain pan is easily removable for cleaning. See illustration below. Auxiliary drip pan

to catch condensed moisture from valves and piping

must be sloped toward the drain pan.

FORM ET115.24-NOM11 (118)

The condensate drain pan can be removed without re-

quiring common hand tools. The drain pan is secured

to the unit by four sheet metal tabs that slide into four

respective slots on the drain pan.

Prior to removing the drain pan, make sure all

accessories and eld connections have been appropriately disconnected from the drain pan. The drain pan can be removed in three steps. First,

push the drain pan engagement lever to unlock the

drain pan from the coil. Next, while continuing to

push the lever, support the weight of the drain pan

and slide the drain pan towards the drain connection. After the drain pan slides approximately 1.5 inches, it will be completely disengaged from the coil. Lastly, support the weight of the drain pan and safely lower the drain pan for servicing. Reinstall prior to unit startup.

COILS

All fan coils are available in 2 or 4 pipe congurations. Heating coils are available in reheat or preheat position. Heating and cooling coils are available with right, left or opposite side connections.

Figure 2a

Figure 2b Figure 2c

Verify that the proper types of service are actually

provided to the unit. On units with steam heating coils, 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.

ENVIRO-TEC

Figure 2d

Figure 2a-2d: Typical drain pan removal

FORM ET115.24-NOM11 (118)

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. Not for use with domestic or potable water systems.

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 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.

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.

Figure 3a

Figure 3b

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. Due to the diversity of valve

packages for this product, install the valve packages with no leaks or interference between components during

operation and maintenance. In the case of eld installed

valves and piping, the chilled water valve cluster (or

metering device 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. Valves and

TXV’s should be secured or supported to avoid damage

to coil headers or distributor tubes. All valves, pipes, and components must be suciently supported to ensure structural integrity and proper operation of the unit.

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.

Figure 3c

Figure 3d

Figure 3a-3d: Typical auxiliary drain pan removal

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

AUXILIARY DRAIN PANS

Mounted directly to the unit drain pan, AUXILIARY DRAIN PANS may also be secured by the mounting holes to eld supports or to the unit coil utilizing pipe hanger wire, plastic ties, or metal strapping.

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.

Prior to removing the auxiliary drain pan, make sure

all accessories have been appropriately disconnected

from the auxiliary drain pan. The auxiliary drain pan can be removed in three steps. First, remove the two screws that attached the auxiliary drain pan to the support bracket near the inlet of the unit. Next, support the weight of the auxiliary drain pan and slide the auxiliary drain pan towards the discharge of the unit so the auxiliary drain pan lip will clear the drain pan lip. After the auxiliary drain pan slides approximately 0.75 inches, the auxiliary drain pan will be free from the drain pan. Lastly, support the weight of the auxiliary drain pan and safely lower for servicing. Reinstall prior to unit startup.

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.

The manufacturer assumes no responsibility for undesirable system operation due to improper design, equipment or component selection, and/or installation of

ductwork, grilles, and other eld supplied components.

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 dierent and each unit on a project may be dierent, the installer must be familiar with the

wiring diagram and nameplate on the unit BEFORE

beginning any wiring. This unit is not acceptable for installation in hazardous/explosive areas.

ELECTRICAL ENCLOSURE

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, ENVIRO-TEC supply and return

grilles are available in a variety of types.

Units can be congured from the factory with duct collars for attaching ductwork. The factory suggests using galvanized sheet metal ductwork or a exible

canvas attached to the duct collars using sheet metal

screws. Duct connections should follow SMACNA standards and national and local codes.

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.

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.

Figure 4: Electrical enclosure

The electrical control enclosure provides access to the

electrical compartment. This compartment houses all electric heat and control components. Terminal strips

are furnished for simple power and control wiring

connections. Multiple knockouts allow wiring entries from either side of the compartment.

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. After installation and before energizing

the unit, verify voltage and check that all electrical

connections are tight. Electrical connetions should be periodically checked for tightness.

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

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.

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.

This unit is listed to UL/CSAS standards. All modications to line voltage wiring must be performed in accordance with the NEC and inspected by ETL to maintain product listing. Unauthorized modication to any wiring may impact unit performance and void ETL listing and/or product warranty.

TELESCOPING BOTTOM PANEL

The telescoping bottom panel allows for fully recessing the unit while permitting service access into the ceiling

plenum. The architectural ceiling panel is nished with a durable powder coat paint.

Portions of the inlet louver not directly below unit inlet may require covering in the field on applications where inltration of ceiling plenum air into space is undesired. Telescoping skirt and collar assembly must be field adjusted to assure a proper t between lter frame and louvered inlet panel assembly. Refer to assembly submittal drawings for specic dimensions.

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

MODEL HLP HORIZONTAL FAN COIL

Optional Telescoping Bottom Panel Assembly, Typical Installation Instructions

Drawings are subject to change without notice. Refer to www.enviro-tec.com for current submittal drawings.

FHP UNIT CHASSIS

10 1/2"

264

7 [178]

10 1/2 [267]

AIR

OPEN THIS PANEL FIRST

FINISHED CEILING LINE

TYPICAL INSTALLATION METHODS

CEILING GRID

"T" BAR

ACOUSTIC FIBRE CEILING TILE

NOTE: CEILING "T" BAR GRID MAY NOT SUPPORT TELESCOPING BOTTOM PANEL ASSEMBLY. BOTTOM PANEL ASSEMBLY MAY REQUIRE INDEPENDENT SUPPORT.

TELESCOPING BOTTOM PANEL FRAME EXTRUSION

SOLID OR LOUVERED BOTTOM PANEL

SUSPENDED GRID/TILE CEILING SYSTEM

INLET COLLAR INSTALLATION

SHIM AS

REQUIRED

TELESCOPING BOTTOM

PANEL FRAME EXTRUSION

SHT MTL OR WOOD

SCREW AS REQUIRED,

SEE NOTES 4 & 6

SOLID OR LOUVERED

BOTTOM PANEL

SHT MTL OR WOOD

SCREW AS REQUIRED, SEE NOTES 4 & 6

STUD/DRYWALL CEILING SYSTEM

SCREW THE TELESCOPING PANEL TO THE CHASSIS 2 SCREWS BOTH SIDE

METAL OR WOOD CEILING STUD

DRYWALL CEILING

SHIM AS

REQUIRED

TABLE 1: TELESCOPING BOTTOM PANEL WEIGHTS (LBS./KG)

DESCRIPTION

Telescoping bottom panel 10 [5] 11 [5] 12 [5] 14 [6] 16 [7] 17 [8] 20 [9] 21 [10]

ENVIRO-TEC

02 03 04 06 08 09 10 12

UNIT SIZE

SERVICE AND CLEARANCE REQUIREMENTS

FORM ET115.24-NOM11 (118)

HORIZONTAL, LOW PROFILE EXPOSED UNITS

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

SERVICE AND CLEARANCE REQUIREMENTS: HEIGHT RESTRICTED APPLICATION

CORNER PANELS SHOWN ROTATED 90°

0" CLEARANCE BETWEEN UNIT AND STRUCTURE

UNIT INSTALLED

HALF OPENED

FULLY OPENED

CORNER PANELS ROTATE ABOUT PIVOT POINT

CORNER PANELS ROTATED 90° CAN BE LIFTED AND REMOVED

11" [279] MIN

REQUIRED CLEARANCE

BESIDE UNIT

REQUIRED CLEARANCE

HORIZONTAL, LOW PROFILE EXPOSED UNITS

ABOVE UNIT

4" [102] MIN

REQUIRED CLEARANCE

BELOW UNIT

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

SERVICE AND CLEARANCE REQUIREMENTS: WIDTH RESTRICTED APPLICATION

CORNER PANELS

SHOWN LIFTED AND

ROTATED 5°

UNIT INSTALLED

HALF OPENED

FULLY OPENED

CLEARANCE BETWEEN

[76]

STRUCTURE AND UNIT

[76]

LIFT AND ROTATE CORNER PANEL

OFF OF PIVOT POINT

ABIDE BY APPLICABLE CODES AND STANDARDS REGUARDING ACCESS FOR ELECTRICAL OR PLUMBING COMPONENTS

1" [25] MIN

REQUIRED CLEARANCE

ABOVE UNIT

3" [76] MIN

REQUIRED CLEARANCE

BESIDE UNIT

(PANEL REMOVAL

REQUIRED FOR

ELECTRICAL ACCESS)

HORIZONTAL, LOW PROFILE EXPOSED UNITS

DROP CORNER PANELS

STRAIGHT DOWN

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

206

8 1/2"

216

OPTIONAL AUXILIRY

DRIP PAN

SUPPLY AIR

OPENIG WIDTH

R10 1/2"

264

CONTROL ENCLOSURE

SEE NOTE 9

FRONT VIEW

LH SHOWN RH

OPPOSITE

22"

559

TOP VIEW

SERVICE AND CLEARANCE REQUIREMENTS: EXTERNAL SPACE REQUIREMENTS

TOP VIEW

22"

559

OPTIONAL

SIDE ACCESS

CONTROL ENCLOSURE

SEE NOTE 5

204

SUPPLY AIR

OPENING WIDTH

FRONT VIEW

OPTIONAL AUXILIARY

10 1/2"

267

AIR FILTER CLEARANCE

HORIZONTAL, LOW PROFILE PLENUM AND FREE RETURN

NOTES:

1. All chilled water piping that projects beyond the condensate pan or the optional auxiliary drip pan must be field insulated by others.

2. Auxiliary drip pan shown above is optional, and is mounted on the outlet side of the drain pan.

3. Drain pan is installed with the outlet tube(s) on cooling coil connection end of coil on 4-pipe units with optional opposite end connection.

4. Dimensions shown on this drawing apply to standard CW and HW valve packages. Refer to the Piping Package Catalog for valve package code details. Contact factory for details on valve packages using non-standard or customer furnished components.

5. Provide sufficient clearance to access electrical components and comply with all applicable codes and ordinances.

8 1/2"

216

DRIP PAN

ENVIRO-TEC

SECTION TWO - START-UP

FORM ET115.24-NOM11 (118)

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.

Fan coils are not intended for temporary heat/cool

or ventilation. Units are not designed or equipped to operate in dusty construction environments. Operation

of the units in conditions outlined above could result in damage to the equipment or building and furnishings

and/or void all manufacturer’s 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.

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 1-½ 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. Check to ensure that

no leaks are prevalent at the coils, coil connections,

piping packages, etc.

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 duct-work 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 duct-work is a unique

system with its own operating characteristics. For this

reason, air balancing is normally done by balance specialists who are familiar with all procedures required to properly establish air distribution and fan system

operating conditions. These procedures should not be attempted by unqualied personnel. Some selections may require air balancing in the eld.

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

ENVIRO-TEC

MOTOR AND FAN DATA

TABLE 2A: PSC MOTORS, MODEL HLP, HLE

FORM ET115.24-NOM11 (118)

UNIT

SIZE

PSC MOTOR HP

(QTY)

02 (1) 1/20

# OF FANS FAN SPEED WATTS

High 55

115 VOLTS 208/230 VOLTS 277 VOLTS

AMPS

0.6 N/A N/AMedium 40

Low 36

03 (1) 1/20

High 61

0.6 N/A N/AMedium 45

Low 40

High 75

04 (1) 1/20 2

0.8 0.4 0.5Medium 65

Low 58

High 80

06 (1) 1/20 2

0.8 0.4 0.5Medium 68

Low 56

High 122

08 (1) 1/10 2

1.1 0.6 0.5Medium 83

Low 66

High 127

09 (1) 1/10 2

1.1 0.6 0.5Medium 86

Low 66

High 148

10 (2) 1/20 4

1.6 0.8 1Medium 128

Low 110

High 160

12 (2) 1/20 4

1.6 0.8 1Medium 139

Low 115

NOTES:

1. Motor electrical data is nameplate data.

2.WattsarebasedonanHLPwithPSCmotor,3rowcoil,12FPI,1"throwawaylter,0.05"ESPat115V.

3. PSC motors are not available in 208-277V on SZ02 and SZ03.

4. Motor data is subject to change and should not be used for submittal purposes. Refer to Web-Select submittal for actual ratings.

TABLE 2B: PSC MOTORS, MODEL HLF

UNIT

PSC MOTOR HP

SIZE

(QTY)

02 (1) 1/20

# OF FANS FAN SPEED WATTS

High 55

Low 36

03 (1) 1/20

High 61

Low 40

High 75

04 (1) 1/20 2

Low 58

High 121

06 (1) 1/10 2

Low 66

High 224

08 (1) 1/6 2

Low 66

High 230

09 (1) 1/6 2

Low 67

High 226

10 (2) 1/10 4

Low 128

High 248

12 (2) 1/10 4

Medium 171

Low 133

NOTES:

1. Motor electrical data is nameplate data.

2.WattsarebasedonanHLFwithPSCmotor,3rowcoil,12FPI,1"throwawaylter,0.05"ESPat115V.

3. PSC motors are not available in 208-277V on SZ02 and SZ03.

4. Motor data is subject to change and should not be used for submittal purposes. Refer to Web-Select submittal for actual ratings.

115 VOLTS 208/230 VOLTS 277 VOLTS

AMPS

0.6 N/A N/AMedium 40

0.6 N/A N/AMedium 45

0.8 0.4 0.5Medium 65

1.1 0.6 0.5Medium 84

2.1 1.1 0.9Medium 140

2.1 1.1 0.9Medium 139

2.2 1.2 1Medium 154

2.2 1.2 1

ENVIRO-TEC

TABLE 3: EC MOTORS

UNIT SIZE

FAN

SPEED

High

Low 14 / 26

High

Low 16 / 33

High

Low 21 / 41

High

Low 36 / 62

High

Low 31 / 62

High

Low 39 / 77

High

Low 54 / 104

High

Low 56 / 105

EC MOTOR

HP (QTY)

(1) 1/4 1

(1) 1/4 2

(2) 1/4 4

# OF

FANS

WATTS

(STD/HS)

32 / 45

35 / 59

50 / 75

104 / 132

91 / 122

119 / 182

142 / 207

143 / 209

FORM ET115.24-NOM11 (118)

1,3

3-SPEED (STD/HS)

AMPS

2-10VDC

3-SPEED (STD/HS)

115 VOLTS 208/230 VOLTS 277 VOLTS

3-SPEED (STD/HS)

0.7 / 1.0 0.9 0.5 / 0.6 0.5 0.4 / 0.5 0.5Medium 21 / 36

1.0 / 1.5 1.1 0.6 / 0.9 0.7 0.5 / 0.8 0.6Medium 23 / 43

1.5 / 1.8 1.2 0.9 / 1.1 0.8 0.8 / 0.9 0.6Medium 33 / 56

2.6 / 3.1 2.0 1.6 / 1.9 1.2 1.3 / 1.6 1.0Medium 62 / 89

2.3 / 2.9 2.0 1.4 / 1.7 1.2 1.2 / 1.5 1.0Medium 54 / 90

3.7 / 4.5 2.7 2.3 / 2.7 1.6 1.9 / 2.3 1.4Medium 72 / 116

3.9 / 5.1 3.1 2.3 / 3.1 1.9 2.0 / 2.6 1.6Medium 91 / 139

3.2 / 4.5 3.5 2.0 / 2.7 2.1 1.6 / 2.3 1.8Medium 92 / 152

2-10VDC

NOTES:

1. Motor electrical data is nameplate data.

2.WattsarebasedonanHLPwith3-speedECmotor,3rowcoil,12FPI,1"throwawaylter,0.05"ESPat115V.

3. For neutral conductor sizing, multiply AMPS by 1.73.

4. Motor data is subject to change and should not be used for submittal. Refer to unit submittal for actual ratings.

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

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.

condition BEFORE beginning water system balancing

operations.

A wide range of controls and electrical options and

accessories may be used with the equipment covered Each hydronic system has different operating characteristics depending on the devices and controls

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

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 After the proper system operation is established, the appropriate system operating conditions such as various

water temperatures and ow rates should be recorded in a convenient place for future reference.

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.

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 systems.

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

SECTION THREE - NORMAL OPERATION & PERIODIC MAINTENANCE

GENERAL

Each unit on a job will have its own unique operating environment and conditions that may dictate a

maintenance schedule for that unit that is dierent 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 or EC type and do not require eld lubrication.

FAN DECK

The fan assembly is easily removed from the unit without disconnecting the ductwork for service access

to motors and blowers at, or away from the unit.

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.

Figure 6a

Figure 5a

Figure 5b

Figure 5a-5b: Bottom panel removal

ENVIRO-TEC

Figure 6b

Figure 6c

Figure 6a-6c: Fan deck removal

COIL

Coils may be cleaned in place by removing the motor/ blower assemblies and brushing the entering air face

between ns with a soft brush parallel to ns. Do not brush perpendicular to n orientation as damage may occur. Brushing should be followed by cleaning with a vacuum cleaner. If a compressed air source is available,

the coil may also be cleaned by blowing air through the

coil ns from the leaving air face. Vacuuming should again follow this. Units provided with the proper type of air lters, replaced regularly, may require periodic coil cleaning.

FORM ET115.24-NOM11 (118)

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.

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.

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 aect 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 insu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. Open wire 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. The high limit thermal cutout device is a manual reset safety device. With proper

unit application and during normal operation, the high

limit thermal cutout will not operate. This device only operates when some problem exists. ANY condition that causes high limit cutout MUST be corrected immediately. Once the high limit trips, it may be reset once the unit has cooled down. Refer to troubleshooting section for high limit reset instructions. 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.

More specific information regarding the use and

operating characteristics of the standard controls oered

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. If a strainer is ordered with

the unit the strainer must be cleaned periodically along

with other scheduled maintenance. In some cases, the

valve actuator may fail and usually can be replaced

without removing valve body from piping.

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

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

Figure 7a

chart below for 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. Consult the factory for applications using lter types other than the factory standard or optional product.

Figure 7c

Figure 7b

Figure 7d

Figure 7a-7d: Filter removal

ENVIRO-TEC

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.

TABLE 4: FACE AREA, FREE AREA AND FILTER SIZES

FORM ET115.24-NOM11 (118)

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. If cleaners

are used, they should be compatible with the materials

of construction for the coil, drain pan, and condensate

pump (if applicable).

UNIT

COIL FACE

SIZE

02 0.89 [0.08] 0.83 [0.08] 0.61 [0.06] 1.17 [0.11]

03 1.07 [0.1] 0.83 [0.08] 0.61 [0.06] 1.39 [0.13]

04 1.35 [0.13] 1.25 [0.12] 0.92 [0.09] 1.77 [0.16]

06 1.72 [0.16] 1.45 [0.14] 1.07 [0.1] 2.26 [0.21]

08 2.11 [0.2] 1.87 [0.17] 1.38 [0.13] 2.77 [0.26]

09 2.35 [0.22] 2.08 [0.19] 1.53 [0.14] 3.08 [0.29]

10 2.89 [0.27] 2.7 [0.25] 1.99 [0.18] 3.79 [0.35]

12 3.33 [0.31] 3.12 [0.29] 2.3 [0.21] 4.38 [0.41]

AREA

RETURN AIR

GRILLE FREE

AREA

SUPPLY AIR

GRILLE FREE

AREA

FILTER FACE AREA (REAR

RETURN)

NOTES:

1. Face and free areas are in square feet [square meters].

2. Filter sizes are in inches [millimeters].

3. Free area of ENVIRO-TEC® Model HLE and Telescoping

Bottom Panel return grilles.

4. Free area of ENVIRO-TEC® Model HLE supply grille and

minimum free area allowable for a supply grille supplied by others.

NOMINAL FILTER SIZES

(REAR RETURN)

16 x 10.5 x 1

[406 x 267 x 25]

19 x 10.5 x 1

[483 x 267 x 25]

24.25 x 10.5 x 1 [616 x 267 x 25]

31 x 10.5 x 1 [787 x 267 x 25] (2) 19 x 10.5 x 1 [483 x 267 x 25]

(1) 20, (1) 22.25 x 10.5 x 1

[508, 565 x 267 x 25]

(2) 26 x 10.5 x1 [660 x 267 x 25]

(1) 20, (1) 40 x 10.5 x 1

[508, 1016 x 267 x 25]

FILTER FACE AREA (BOTTOM RETURN)

1.06 [0.1]

1.25 [0.12]

1.60 [0.15]

2.05 [0.19]

2.51 [0.23]

2.79 [0.26]

3.43 [0.32]

3.96 [0.37]

NOMINAL FILTER SIZES

(BOTTOM RETURN)

16 x 9.25 x 1

[406 x 235 x 25]

19 x 9.25 x 1

[483 x 235 x 25]

24.25 x 9.25 x 1

[616 x 235 x 25]

31 x 9.25 x 1

[787 x 235 x 25]

(2) 19 x 9.25 x 1

[483 x 235 x 25]

(1) 20, (1) 22.25 x 9.25 x 1

[508, 565 x 235 x 25]

(2) 26 x 9.25 x1 [660 x 235 x 25]

(1) 20, (1) 40 x 9.

[508, 1016 x 235 x 25]

25 x 1

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

CONDENSATE WATER PUMP

SAFETY WARNING

Risk of electric shock. Make certain that the entire power supply to the unit/system is disconnected before attempting to install, service or remove this component.

General information

The high performance water condensate pump is

suitable for units up to 5.6 tons (67 kBtu - 20 kW). The piston technology is specically designed for removing condensate from air conditioning systems. It is fully

reliable, in any kind of environment and its operating

sound level will remain silent <23 dB whatever the volume of condensate.

Technical specications

Operation voltage

Operating temperature

Thermal protection

(overheating)

Max head 23 Ft

Max suction

lift

Replacement instructions

a. Disconnect the main power on the unit. b. For wiring connection to unit, refer to unit wire

diagram.

c. For accessories, assembly, and internal wire

connections, refer to condensate water pump

manufacturer instructions.

d. Locate the two alignment holes for the water pump

bracket, right bottom corner of the unit.

e. Attach pump to bracket and mount it to unit with

two screws. (See Figure 1)

Complete all assembly prior to mounting pump cover.

g. Connect tubing. Once all of the connections are

made, reconnect the main power of the unit.

120V +/- 10% ~50/60Hz – 4.7W 208 - 230V +/- 10% ~50/60Hz – 4.7W

Max 257 °F (125 °C) auto-reset

257 °F (125 °C) auto-reset

16.52 Ft

CURRENT SWITCH DEVICE

SAFETY WARNING

The Current Switch is intended to provide an input to equipment under normal operating conditions. Where failure or malfunction of the Current Switch could lead to personal injury or property damage to the controlled equipment or other property, additional precautions must be designed into the control system. Incorporate and maintain other devices, such as supervisory or alarm systems or safety or limit controls, intended to warn of or protect against failure or malfunction of the Current Switch.

General information

The Current Switch is a non-intrusive device that detects current owing through the motor power wire. Completely self-powered, the Current Switch draws its

power from current induced by the power wire of the

motor being monitored. Fig. 5 shows the current switch wire connections. It is panel mounted with two screws inside the main electrical enclosure; refer to g. 6.

Technical specications

Wire size

Status output Switch normally open

Switch load

capacity

Figure 9 Current Switch in circuit

2.1–0.6 mm (12–22 AWG)

diameter recommended

1 A at 30 VAC/42 VDC maximum

ENVIRO-TEC

Figure 10 Current Switch mounting

DIFFERENTIAL AIR PRESSURE SWITCH

FORM ET115.24-NOM11 (118)

General information

This accessory is a dierential pressure switch with a normally-open (NO) dry contact that is factory calibrated to close at a dierential pressure of 0.15 inches of water or greater. The switch measures the pressure dierential between the unit’s fan section and the environmental pressure outside the unit. When the lter is suciently clogged or dirty, dierential pressure will rise and the switch will close.

Technical specications

Electrical

Initial resistance <500mW

Rating

3.15ma @ 125VAC 10-20ma @ 5-24VDC

Adjustable set point ranges in H2O

Ranges

In H2O

Min. Max. Proof

0.10 0.50 5.0

Functional

Operating positing

Operating temp.

Diaphragm vertical, barbed

ttings horizontal

-40 °F to 140 °F (-40 °C to 60 °C)

Installation Assembly

The dierential air pressure switch is mounted inside the unit with double sided tape behind the lter retention tab. (See gure 12a). Instructions for commissioning or replacing the dierential air pressure switch:

a. Disconnect main power on the unit. b. Secure dierential air pressure switch on the lter

retention tab using double sided tape. Position the pressure port (marked with “+”) outside the chassis exposed to the environment. The vacuum port should extend inside the chassis and be open

to the unit’s fan section. (See gure 12b.) c. Wire the NO relay using .187 quick connectors. d. Verify all connections before reconnecting main

power.

General measurements: Pressure Switch

Figure 11

Figure 12a

Figure 12b

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

DISCHARGE AIR SENSOR

General Information

The Discharge Air Sensor is a nickel 1kΩ sensor probe with a anged mounting bracket (no enclosure).

Suggested Location

The Discharge Air Sensor is tted to the side of the coil ange in the holes provided for this accessory. (See Figure 13.)

Replacement instructions

a. Disconnect the main power on the unit. b. Mount the Discharge Air Sensor with two screws

as shown. (See Figure 13.)

c. Secure the plenum-rated cable into control

enclosure using the control enclosure knockouts

accordingly.

d. Once all of the connections are made, reconnect

the main power.

LOW TEMPERATURE CUTOUT CONTROL

General information

This low temperature device will de-energize the system if the operating conditions begin to approach freezing

(as water freezes it expands and will rupture the coil barrel tubes). The function of this low temperature device is to cycle a SPST switch in response to changes of temperature. Refer to g. 4 to locate the device on your unit.

Adaptable cold control

Range of adjustments are limited to the rotation of the

dial for the required temperature set point needed.

Altitude correction chart

(CW TURNS OF RANGE SCREW)

Feet Turns Feet Turns

2000 35 8000 215

4000 100 9000 250

6000 160 10000 270

Electrical ratings

WARNING: Do not exceed the maximum wattage, ratings, or published operating conditions as noted below.

Figure 13

ENVIRO-TEC

Replacement instructions

The primary purpose of the low limit cutout is to prevent

the coil from freezing. Therefore, before mounting the

control, you need to consider all possible factors that

help protect the coil from freezing. It is important that

the cutout capillary not be cut, kinked or pinched in

mounting to unit elements. Also, ensure tubing clamps

and wells are of compatible material with the control

sensing element to prevent corrosion.

a. Disconnect the main power on the unit. b. Locate the two inner mounting holes between

control enclosure and coil.

c. Use two supplied screws to mount the low

temperature cutout in place.

d. Work your way back up to the bellows, stringing

the sensing element throughout the drain pan,

e. Position the sensing element horizontally across

the face of the coil, and secure the sensing element

with mount tape and wire tie. (See Figure 14.) f. Wire the NC relay using the .250 quick connectors. g. Once all of the connections are made, reconnect

the main power of the unit.

FORM ET115.24-NOM11 (118)

Figure 14

TABLE 5: UNIT WEIGHT DATA (LBS./KG)

COMPONENT

HLF BASE UNIT 22 [10] 25 [12] 33 [15] 43 [20] 53 [24] 60 [27] 74 [34] 83 [38]

HLP BASE UNIT 24 [11] 28 [13] 36 [16] 47 [21] 58 [26] 65 [30] 81 [37] 91 [41]

HLE BASE UNIT 56 [25] 63 [29] 75 [34] 92 [42] 108 [49] 118 [54] 141 [64] 158 [72]

1 ROW - DRY 6 [3] 7 [3] 8 [4] 10 [4] 11 [5] 13 [6] 15 [7] 17 [8]

1 ROW - WET 8 [4] 9 [4] 10 [4] 12 [5] 13 [6] 15 [7] 17 [8] 19 [9]

2 ROW - DRY 7 [3] 8 [4] 10 [4] 12 [5] 14 [6] 16 [7] 19 [9] 22 [10]

2 ROW - WET 9 [4] 10 [5] 12 [5] 14 [6] 17 [8] 19 [8] 23 [10] 27 [12]

3 ROW - DRY 8 [4] 10 [4] 12 [5] 14 [6] 17 [8] 19 [9] 23 [10] 26 [12]

3 ROW - WET 10 [5] 12 [5] 15 [7] 17 [8] 21 [10] 23 [10] 28 [13] 32 [14]

COIL

ROWS

4 ROW - DRY 9 [4] 11 [5] 13 [6] 17 [8] 20 [9] 22 [10] 27 [12] 30 [14]

4 ROW - WET 13 [6] 15 [7] 18 [8] 22 [10] 26 [12] 28 [13] 34 [15] 38 [17]

5 ROW - DRY 11 [5] 13 [6] 15 [7] 19 [9] 23 [10] 25 [11] 30 [14] 35 [16]

5 ROW - WET 17 [8] 19 [8] 22 [10] 26 [12] 31 [14] 33 [15] 39 [18] 45 [20]

6 ROW - DRY 12 [5] 14 [6] 17 [8] 21 [10] 26 [12] 28 [13] 34 [16] 39 [18]

6 ROW - WET 19 [9] 21 [10] 25 [11] 29 [13] 36 [16] 38 [17] 45 [21] 51 [23]

02 03 04 06 08 09 10 12

UNIT SIZE

ENVIRO-TEC

CONDENSATE FLOAT SWITCH INSTALLATION

FORM ET115.24-NOM11 (118)

Ensure oat switch assembly is rmly secured to the bracket. Ensure top of oat is below rim of pan. Switch

will trip when the water level reaches a point even with

top of oat when oat is in down position. Sensitivity

may be adjusted by threading switch assembly

downward out of bracket if necessary.

Test switch by lifting oat with unit on. Unit should stop running if switch is correctly wired. Test switch sensitivity by lling pan and conrm switch stops unit before pan overows.

Supplier’s install instructions

1. Disconnect power to unit at main panel.

2. Clip switch bracket onto side of pan at low end and press rmly into place ensuring switch wires are positioned up ensure oat moves freely.

3. Secure bracket into side of pan using self-tapping sheet metal screw through upper hole in bracket.

4. Ensure oat switch assembly is rmly secured to bracket. Ensure top of oat is below rim of pan. Switch will trip when water level reaches a point even with top of oat (when oat is in down position). Sensitivity may be adjusted by

threading switch assembly downward out of

bracket if necessary.

5. Ensure wiring matches the wiring diagram provided with the unit.

6. Test switch by lifting oat with unit on. Unit should stop running if switch is correctly wired.

7. Test switch sensitivity. Fill pan and conrm that switch stops unit before pan overows.

8. Place warning sticker on air handler or condenser

unit.

Figure 15a: Drain pan oat switch installed

Figure 15b: Drain pan oat switch diagram

ENVIRO-TEC

REPLACEMENT PARTS

Factory replacement parts should be used wherever possible to maintain the unit performance and

operating characteristics and the testing agency listings.

Replacement parts may be purchased through the local

Sales Representative.

Contact the local Sales Representative before attempting any unit modications. Any modications not authorized

by the factory could result in personnel injury and damage to the unit and could void all factory warranties

and regulatory listings.

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 the direction of airow at the inlet

3. Complete part description including any numbers.

FORM ET115.24-NOM11 (118)

On warranty replacements, in addition to the information previously listed, the project CO # that appears on

the unit nameplate, is required. Contact local Sales Representative and refr to warranty policy.

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.

ENVIRO-TEC

SECTION FOUR - INSPECTION & START-UP CHECKLIST

RECEIVING & INSPECTION

FORM ET115.24-NOM11 (118)

Unit received undamaged

Unit arrangement/hand correct

HANDLING & INSTALLATION

Unit mounted level & square

Proper electrical service provided

Proper service switch/disconnect provided

Proper chilled water line size to unit

Proper refrigerant line sizes to unit

Proper steam condensate trap on return line

All services to unit in code compliance

COOLING/HEATING CONNECTIONS

Protect Valve Package Components From Heat

Connect Field Piping To Unit

Install Drain Line & Traps As Required

Install Condensate Pan under Piping as Required

Unit received complete as ordered

Unit structural support complete & correct

Proper access provided for unit & accessories

Proper overcurrent protection provided

Proper hot water line to unit

Proper steam line sizes to unit

Proper steam supply pressure to unit (15psi max)

All shipping screws & braces removed

Mount valve packages

Pressure test all piping for leaks

Insulate all piping as required

DUCTWORK CONNECTIONS

Install Ductwork, Fittings & Grilles As Required

Control Outside Air For Freeze Protection

ELECTRICAL CONNECTIONS

Refer to unit wiring diagram

All eld wiring in code compliance

UNIT STARTUP

General visual unit & system inspection

Record ambient temperature

Close all unit isolation valves

Fill systems with water/refrigerant

All ductwork & grilles in place

Start fans, etc.

Check all ductwork & units for air leaks

Record all nal settings for future use

Proper supply & return grille type & size used

Insulate all ductwork as required

Connect incoming power service or services

Record electrical supply voltage

Check all wiring for secure connections

Flush water systems

Vent water systems as required

All unit panels & lters in place

Check for overload condition of all units

Balance air systems as required

Check piping & ductwork for vibration

Check all dampers for proper operation

Verify proper heating operation

ENVIRO-TEC

Verify proper cooling operation

Reinstall all covers & access panels

FAN RELAY BOARD – INSTALLATION, OPERATION AND MAINTENANCE

FORM ET115.24-NOM11 (118)

The Fan Relay Board assembly (FRBii) provides

electronic control for the fan motor and various

connections for peripheral devices. The FRBii accepts

incoming single phase power of nominal AC voltages

120, 208, 240 and 277. The assembly includes a multitap transformer (30VA or 50VA) that steps each of these primary voltages to 24 VAC. The assembly allows for

the control of a three speed fan motor, including a relay

for control of the neutral voltage signal path.

The FRBii can be connected to an external device (e.g., thermostat, controller, 3-speed switch) to control the three fan speeds. The FRBii includes logic to detect

when multiple speeds are commanded simultaneously and block all but the highest of the commanded speeds

from being sent to the motor windings. A signal to call for electric heat from an external controller will

verify that a fan speed is selected before providing the

command signal to the external electric heat control to

ensure that electric heat can only be energized when the

fan motor is operational. The assembly includes factory

provided harnesses to allow for faster installation and

improved troubleshooting by the end user.

The FRBii allows for peripheral devices (e.g., thermostat

controllers, electric heat relays, water valve actuators,

condensate drain pan oat switches, air dampers) to be connected by either the OEM or by the installer. The fan

relay board also includes a fuse on the secondary side of the transformer to protect against incorrect wiring of

external components, shorting the transformer leads.

The signals in the screw terminal block (TB1) and 18-pin black connector (J1) have a nominal voltage of 24VAC. These signals are properly insulated from line voltage present on the assembly (J2-J5).

Figure F.1: Fan Relay Board (FRBii)

ENVIRO-TEC

INSTALLATION

FORM ET115.24-NOM11 (118)

MOUNTING

Important: Do not overtighten the screws. Overtightening may strip the threads and will void the warranty.

Using #8-3/4" screws (quantity six), install the assembly using the provided standos.

Risk of Electric Shock Disconnect or isolate all power supplies before making electrical connections. More than one disconnection or isolation may be required to completely de-energize equipment. Contact with components carrying hazardous voltage can cause electric shock and may result in severe personal injury or death.

WIRING

Install the wiring so it does not cause a hazard, and is

protected against electrical and mechanical damage. .

Risk of electric shock Ground the FRBii according to local, national, and regional regulations. Failure to ground the FRBii may result in electric shock and severe personal injury or death.

Ground the assembly from the EARTH terminal (W2) to the enclosure.

Ratings

30VA – PC-01-0134

Model(s)

Voltage 120 through 277VAC

Current (fan relays) 12A

Operating temperature -4°F to 140°F (-20°C to 60°C)

PK-FCU030-0 (25-3043-7)

50VA – PC-01-0135 PK-FCU050-0 (25-3043-15)

ENVIRO-TEC

REFERENCE WIRE DIAGRAM

FORM ET115.24-NOM11 (118)

ENVIRO-TEC

FRBii INPUTS AND OUTPUTS

FORM ET115.24-NOM11 (118)

TB1 – Low Voltage Peripheral Devices TABLE F.1 – SCREW TERMINAL (TB1) SIGNAL IDENTIFICATION

(see Table F.9 for detailed description of each signal)

Pin Signal

Y1 – Cool 1

Y2 – Cool 2

W1 – Heat 1

L – Low

M – Medium

H - High

G – Fan Enable

C – Common (through JP2)

R – 24VAC

S2 – Auxiliary Input (Heat 2)

S1 – Common

J1 – Low Voltage Peripheral Devices TABLE F.2 – LOW VOLTAGE PERIPHERAL DEVICE (J1) SIGNAL IDENTIFICATION

Pin Signal

R – 24VAC

S2 – Aux In (Heat 2)

Y1 – Cool 1

Y2 – Cool 2

LOW

MED

HIGH

24V

G – Fan Enable

W1 – Heat 1

COM

DAMP - Damper

COM

HEAT – Heat output

COM

24V

S1 – Common

J2/J3 – Incoming Power TABLE F.3 – INCOMING POWER (J2 & J3) SIGNAL IDENTIFICATION

Pin Signal

NEUT

120

208

240

277

J4/J5 – Motor Output TABLE F.4 – MOTOR OUTPUT (J4 & J5) SIGNAL IDENTIFICATION

Pin Signal

LOW

MED

HIGH

NEUT

W1 – MTR PWR

The MTR PWR quick connect provides voltage to the line side of the fan speed relays through an external jumper. For PSC motors, this will be the line voltage of the unit. For EC motors, this will either be 24VAC (without PWM) or a switch contact common (with PWM).

W2 – EARTH

EARTH connection grounds the secondary side of the

transformer to the enclosure cabinet through a wire

bonded to the control enclosure.

ENVIRO-TEC

Figure F.2 – Connector layout

FORM ET115.24-NOM11 (118)

Tools needed for installation/troubleshooting:

• Digital multimeter capable of measuring 30 volts

• Insulated 1/8" at bladed screwdriver

• Fuse puller (optional)

• Mini hook test clips for multimeter (optional)

Fuse: A fuse is included on the secondary side of the transformer to protect the transformer from incorrect

wiring of thermostat, controller, etc. that shorts the 24VAC and COM. The fuse is a fast-acting glass body cylindrical fuse (5x20mm). If tripped, replace the fuse

by removing the tripped fuse with fuse pullers and

replace using one of the below listed fuses.

Suggested fuse replacement information:

TABLE F.5 – REPLACEMENT FUSE

Transformer Fuse Part Number Manufacturer Part Number

30VA 2A PE-06-0000 Littelfuse 0235002.MXP

Bussmann BK/GMA-2-R

50VA 3A PE-06-0016 Littelfuse 0235003.MXP

Bussmann BK/GMA-3-R

HEAT Output – The HEAT output connects to an electric heat contactor or relay. This output represents

the command signal from the thermostat or controller

on the W1 input. The output is interlocked with the fan

relays to ensure that a fan speed is commanded when

electric heat is requested.

DAMP Output – The DAMP output connects to a motorized damper actuator used to control airow from an external source. This output provides 24VAC to energize the damper actuator. This output is

interlocked with the fan relays to ensure that a fan speed

is commanded before energizing the damper actuator.

TABLE F.6 – FIELD INSTALLED COMPONENT DESCRIPTIONS

Name Description

To install a oat switch, wire the oat switch leads into S1 and C on the screw terminals. After wiring the oat switch, remove jumper JP2. The JP2 jumper

Field-provided Float Switch

must be removed for the oat switch to operate correctly.

Note: If a oat switch was installed in the factory, the oat switch may be connected

through a factory-provided harnesses instead of wired to the screw terminal.

To start or stop the fan from an external controller, wire the leads for the switch

Start/Stop for the fan

contacts that will be made or broken to R and G on the screw terminals. After wiring the switch, remove jumper JP3.

Remote 3-speed switch

To add a remote 3-speed switch, wire the leads for the switch to G, H, M and L on the screw terminals. After wiring the switch, remove jumper JP1.

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

JUMPERS

TABLE F.7 – JUMPER DESCRIPTION

Jumper Name Description

This jumper is installed between

24V and HIGH when no three

speed switch is included (remote

or unit mounted). The jumper

will be installed at the end of

the harness connected to J1. If a

JP1

Speed Select Jumper

three speed switch is added later,

JP1 must be removed.

This jumper is installed between

JP2

Float

Switch Jumper

S1 and C when a oat switch is not installed. The jumper is removed when a oat switch is installed.

This jumper is installed between

R and G/24V. The jumper is

removed when remote control of

the fan motor is desired. In most instances, JP3 will be installed

(unless a thermostat or controller

JP3

Fan Enable

Jumper

is remotely controlling of the

equipment).

TEST POINTS

TABLE F.8 – TEST POINT DESCRIPTION

Test Point Name Description

TP1

TP2

24VAC These test points can be

COM

used to verify 24VAC

assuming incoming voltage

is within tolerance. They

can be connected to with mini-hook test clips for a

digital multimeter. Test point locations for TP1 and TP2 can be seen in Figure F.3.

JP2 and JP3 locations can be seen in Figure F.3.

Figure F.3: FRBii Jumpers and Test Points

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

Screw Terminal Signals:

TABLE F.9 – SCREW TERMINAL SIGNAL IDENTIFICATION

Pin Signal Signal Name Description

Y1 Cool 1 Chilled water valve actuator control input, and thermostat cooling

output.

Y2 Cool 2 “Close” input of modulating chilled water valve actuator or 2nd stage

chilled water valve actuator control input, and thermostat cooling

output. Y1 is “Open” output if oating {tristate} chilled water valve actuator is installed.

W1 Heat 1 Wire connection point for hot water valve actuator or 1st stage EH

control input, and thermostat heating output.

L Low Low speed control input for onboard relay.

M Medium Medium speed control for onboard relay.

H High High speed control input for onboard relay.

G Fan Enable Used to allow external start-stop control from an external source.

C Common (through JP2) Device common, including onboard speed relays (all terminals C and

R 24VAC Transformer “hot” connection (24VAC).

S2 Auxiliary Input (Heat 2) Used for dierent functions based on application, such as:

“COM” on board are internally connected).

• 2nd stage heat control for two stage EH applications

• Changeover water valve/aquastat for two pipe changeover applications.

• “Close” input of modulating hot water valve actuator and “Close” output of thermostat in oating [tristate] water valve applications.

S1 Common Common side of transformer. Jumped to C (common) through JP2.

If application calls for oat switch JP2 is removed and oat switch is connected between S1 and C.

ENVIRO-TEC

CHECKING WIRE HARNESSES

FORM ET115.24-NOM11 (118)

Use ohmmeter to verify that ground wire has continuity from S1 to enclosure case.

To check incoming power wire harness:

• Refer to wiring diagram.

• Remove power from the unit. Unplug power harness J2 or J3 connector.

• Unplug power wires from connections (line block, disconnect switch, toggle switch or fuse(s)) in electrical enclosure. Verify continuity of wires, then reconnect to J2 or J3 connector.

To check motor harness:

• Refer to wiring diagram.

• Remove power from the unit. Unplug motor harness J4 and/or J5 connector.

• Unplug motor harness from motor connection or PWM board (depending on type of motor). Verify continuity of wires, then reconnect to J4 or J5 connector and to motor or PWM board.

To check low voltage wire harnesses:

• Remove power from the unit. Unplug low voltage harness J1 connector and disconnect connections at other end of J1 harness.

• Use ohmmeter to check continuity for each conductor, then reconnect harness to J1 connector and to other connections.

Before reconnecting power to unit, verify all harnesses

are connected per diagram.

Use caution when inserting meter probe into plug. Excess force will damage contacts.

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

FAN RELAY BOARD TROUBLESHOOTING GUIDELINES

Risk of Electric Shock. Disconnect or isolate all power supplies before making electrical connections. More than one disconnection or isolation may be required to completely de-energize equipment. Contact with components carrying hazardous voltage can cause electric shock and may result in severe personal injury or death.

No routine maintenance is required for the fan relay board.

TABLE F.10 - FAN RELAY BOARD TROUBLESHOOTING GUIDELINES

PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION

Measure resistance across fuse:

• A properly working fuse will measure <1.0 Ω.

• A blown fuse will measure as an open circuit.

Replace fuse if blown using replacement fuse

identied above.

Verify incoming voltage to the unit is within

tolerance.

• Verify that the unit is wired per the unit wiring diagram for incoming voltage. If the

unit includes main fusing, verify that the

fuses are not blown.

• Verify wire harness connections are secure. See “Checking Wire Harnesses” section.

Verify that either a float switch or JP2 are installed. If neither, install one of them.

Verify that either an external start/stop or JP3 are installed. If neither, install one of them.

If all of the above are conrmed, replace the fan relay board.

Verify a fan speed is commanded from either

jumper JP1, a unit-mounted or remote-mounted three speed switch, or a thermostat.

Verify that fan motor is running. A fan speed

must be commanded from one of these sources to allow the electric heat contactor to energize

on a call for heat.

Verify that fan motor is running. A fan speed

must be commanded from one of these sources

to allow the damper actuator to energize.

No 24VAC power

Fan motor will not run

Electric heat signal is not provided to contactor

Outside Air Damper actuator will not energize

Blown fuse onboard (F1)

Incorrect incoming line voltage

Improper wiring connections

JP2 removed without float switch

installed

Float switch tripped Verify oat switch (if present) is made.

JP3 removed without external start/

stop control installed

Damaged transformer

No 24VAC power See above.

Fan speed is not commanded.

ENVIRO-TEC

PSC MOTOR TROUBLESHOOTING GUIDELINES

Problem Possible cause Corrective action

No demand.

Fan speed is not commanded.

No power to motor. Possible

blown fuse or open circuit breaker

Verify thermostat or control is calling for heating or

cooling.

Verify fan run command is present at ‘g’ terminal of fan

relay board (24v units) or of terminal block.

Verify line voltage at motor terminals. Replace fuse or reset circuit breaker.

Incorrect voltage applied. Verify proper voltage to unit per unit label.

Verify wiring. If fan coil relay board present, verify all

Improper wiring connections

jumpers and harnesses installed. Refer to fan coil relay board troubleshooting guide.

Fan speed adjustment outside operating range

[24V units] three speed switch in o position.

If fan speed controller present, adjust fan speed control

screw to full clockwise position. Very that motor starts. Reduce adjustment.

Verify three speed switch, if present, is set to desired

speed.

[24V units] loss of 24v power Refer to fan relay board troubleshooting guide.

If drain pan oat switch installed. Verify drain pan is not full. Verify operation of oat switch. Adjust switch position if needed.

Verify operation of oat switch, if installed. Disconnect

switch and use volt-ohm meter to verify continuity of

switch and of wiring. Replace switch if faulty.

No air ow [psc

motor]

[24V units] drain pan oat

switch tripped

[24V units] drain pan oat

switch fault

If low temperature cutout present. Examine coil for signs

Low temperature cutout has

tripped

of freezing. Verify adjustment of freeze stat. Disconnect switch and use volt-ohm meter to verify continuity. Replace switch if faulty.

Remove power from unit. Clear blockage. Verify blower

Blower jammed

is not damaged and rotates freely while motor is not

energized.

If motor hums or buzzes but does not start. Disconnect power from unit. Discharge capacitor. Remove motor capacitor from circuit. Use analog volt-ohm meter to

Failed motor capacitor

verify motor capacitor. Set meter to kilo-ohms scale. Touch probes to capacitor terminals. Needle will jump to zero ohms then drift back to high ohms. Steady high ohms or stead low ohms indicates failed capacitor.

Motor seized

Remove power from unit. Verify motor rotates freely by hand with blower disconnected. If not, replace motor.

Damaged motor harness Replace motor harness

Verify motor is not overheated. Check to ensure blower

Motor overloaded.

rotates freely with motor disconnected. Verify proper duct static. Wait for motor to cool down and verify motor start. If motor overheats again, replace motor.

FORM ET115.24-NOM11 (118)

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

Fan speed

uctuates [psc

motor]

Poor airow

performance

[psc motor]

Fan speed adjustment outside operating range

If fan speed controller present, adjust fan speed control

screw to full clockwise position. Very that motor speed stabilizes. Reduce adjustment.

Loose motor wiring Reseat motor connector. Tighten all motor connections.

Loose control wiring Verify and/or tighten all control connections.

Verify operation of any control device such as drain pan

Intermittent control device

oat switch, freeze stat, thermostat, etc. When in doubt, jumper out and verify fan operation.

Blower set screw loose Remove power from unit. Tighten screw onto motor shaft.

Verify proper ductwork to unit. Verify ductwork is

Improper duct connections

installed per smacna and ashrae guidelines. Improper ductwork can cause turbulence at the motor.

Verify dampers, if present, are not closed. Verify there

Esp (external static pressure)

too high

are no obstructions in the discharge ductwork and/or at

the plenum opening. Verify lter is not dirty and does not obstruct airow.

Lack of required external static

pressure

[24V units] three speed switch in wrong position.

External static pressure not as designed. Adjust external

static pressure to design pressure

Verify three speed switch, if present, is set to desired

speed.

Poor voltage quality Verify input voltage within acceptable parameters.

Fan speed control adjustment outside fan operating range

Improper duct connections

Duct obstruction

If fan speed controller present. Adjust fan speed control screw to full clockwise position. Verify airow. Reduce adjustment to speed that provides desired performance.

Verify ductwork is installed per smacna and ashrae

guidelines.

Verify no obstructions. Verify all dampers are full open while fan operates.

Improperly set dampers Verify proper inlet air to unit.

Dirty coil

Check cleanliness of coil. Dirty coil ns will restrict airow.

Dirty lters Check for dirty or blocked lters. Replace as needed.

Damaged or blocked blower Verify blower rotates freely. Clear blockage.

ENVIRO-TEC

Fan motor starts

but stops. [Psc

motor]

Excessive fan noise

FORM ET115.24-NOM11 (118)

Voltage or ground loss at motor Verify proper voltage and ground at motor.

Blower blocked

Clear blockage. Verify blower rotates freely with motor disconnected.

Verify operation of thermostat or controller. If 24v unit,

Loss of fan speed command.

verify fan speed command at relay board. Refer to fan relay board troubleshooting guide.

Use amp meter to verify motor amps. Disconnect power

Motor overloaded

to unit. Verify motor rotates freely by hand with blower disconnected. If not, replace motor.

Open ductwork Verify ducts sealed properly.

Verify dampers, if present, are not closed. Verify there

Motor overheated due to lack

of airow

are no obstructions in the discharge ductwork and/or at

the plenum opening. Verify lter is not dirty and does not obstruct airow.

Voltage or ground loss at motor

Verify proper voltage and ground at motor power

terminals.

Motor fault or end of life. Replace motor.

Faulty motor harness

Reseat connector and verify operation. Disconnect motor harnesses and verify continuity. Replace motor harness.

Motor mounting bolts loose Tighten motor mounting bolts.

Motor shaft bent Replace motor.

Motor bearing end of life

Disconnect power from unit. Verify motor rotates freely by hand with blower disconnected.

Verify static pressure per system design. Use amp meter

Motor overloaded

to verify motor amps. Disconnect power to unit. Verify motor rotates freely with power disconnected. If not, replace motor.

Motor end of life Use amp meter to verify motor amps. Replace motor.

Dirty lters Verify lters. Replace as needed.

Obstructed airow

Improper duct connections

Verify blower is unobstructed. Verify no duct obstruction. Verify dampers are full open.

Verify ductwork is installed per smacna and ashrae

guidelines.

Static pressure too low Verify static pressure per system design.

Improperly balanced system Verify airow through connected ductwork

Fan wheel rubbing on fan housing

Loose fan wheel

Damaged fan wheel

Remover power from unit. Align wheel in housing.

Remover power from unit. Align wheel in housing and tighten.

Inspect fan wheel to verify ns are not bent. Replace blower as needed.

Imbalanced fan wheel Inspect fan wheel. Replace as needed.

ENVIRO-TEC

EC MOTOR TROUBLESHOOTING GUIDELINES

Problem Possible cause Corrective action

No demand.

Verify thermostat or control is calling for heating or cooling.

Fan speed is not commanded. Verify fan run command is present at Fan Relay Board.

No power to motor. Possible

blown fuse or open circuit breaker

Verify line voltage at motor terminals. Replace fuse or reset circuit breaker as needed.

Incorrect voltage applied. Verify proper voltage to unit per unit label.

Verify wiring. If Fan Coil Relay board present, verify

Improper wiring connections

all jumpers and harnesses installed on Fan Relay Board. Refer to Fan Coil Relay Board Troubleshooting Guide.

Three speed switch in OFF

position.

Verify three speed switch, if present, is set to desired

speed.

Loss of 24V power Refer to Fan Relay Board Troubleshooting Guide.

If drain pan oat switch is present, verify drain pan is

Drain pan oat switch tripped

not full. Verify operation of oat switch. Adjust switch position if needed.

Verify operation of drain pan oat switch, if present.

Drain pan oat switch fault

Disconnect switch and use volt-ohm meter to verify

continuity of switch and of wiring. Replace switch if faulty.

If low temperature cutout is present. Examine coil

Low temperature cutout has

tripped

No air ow [EC motor]

Blower jammed

for signs of freezing. Verify adjustment of freeze stat.

Disconnect switch and use volt-ohm meter to verify

continuity. Replace switch if faulty.

Remvoe power from unit. Clear blockage. Verify blower

is not damaged and rotates freely while motor is not

energized.

Remove power from unit. Verify motor rotates freely by

Motor seized

hand with blower disconnected. If not, replace motor.

Note: EC motors may not rotate freely as the rotor aligns

with the stator magnets.

Verify motor is not overheated. Remove power from unit. Check to ensure blower rotates freely with motor

Motor overloaded.

disconnected. Verify proper duct static. Wait for motor to cool down and verify motor start. If motor overheats again, replace motor.

Refer to PWM board status LEDs. Verify voltage input,

PWM board faulted

wiring and connections. Refer to PWM board IOM. Replace PWM board if fault returns.

EC motors may run at idle speed if they lose PWM signal

No control signal

while enabled. Verify PWM signal at motor connector. Refer to PWM board IOM.

Wiring harness improperly

seated

Wiring harness(es) open or

intermittent

Unplug harness and re-install, making sure plugs are fully seated.

Replace harness(es). Refer to PWM board IOM.

Damaged motor harness Replace motor harness

FORM ET115.24-NOM11 (118)

ENVIRO-TEC

Fan motor

surges [EC

motor]

Poor Airow

Performance

[ECM motor]

FORM ET115.24-NOM11 (118)

Loose motor wiring Reseat motor connector. Tighten all motor connections.

Loose control wiring Verify and/or tighten all control connections.

Verify operation of any control device such as drain pan

Intermittent control device

oat switch, freeze stat, thermostat, etc. When in doubt, jumper out and verify fan operation.

[EC motor] Fan speed

adjustment outside operating range

[EC motor] Faulty PWM

signal

Refer to Fan Calibration curve on unit. Adjust speed on PWM Controller to value that will allow motor to start. See instructions for Adjusting EC Motor Speed.

Verify PWM signal at motor connector. Refer to PWM board IOM.

Blower Set Screw loose Tighten Screw onto motor shaft.

Verify proper ductwork to unit. Verify ductwork is

Improper duct connections

installed per SMACNA and ASHRAE guidelines. Incorrectly sized ducts can cause motor surging.

Verify dampers, if present, are not closed. Verify there

ESP (external static pressure)

too high

are no obstructions in the discharge ductwork and/or at

the plenum opening. Verify lter is not dirty and does not obstruct airow.

Lack of required external static

pressure

[24V units] Three speed switch in wrong position.

External static pressure not as designed. Adjust external

static pressure to design pressure

Verify three speed switch, if present, is set to desired

speed.

Poor voltage quality Verify input voltage within acceptable parameters.

Speed adjustment outside fan

operating range

Erratic speed command (in

Proportional Control mode)

Improper duct connections

Duct obstruction

Refer to Fan Calibration curve on unit. Adjust speed on PWM Controller to value that will allow motor to start. See instructions for Adjusting EC Motor Speed.

Verify 2-10V analog signal at Remote Control Input terminals.

Verify ductwork is installed per SMACNA and ASHRAE guidelines.

Verify no obstructions. Verify all dampers are full open while fan operates.

Improperly set dampers Verify proper inlet air to unit.

Dirty coil

Check cleanliness of coil. Dirty coil ns will restrict airow.

Dirty lters Check for dirty or blocked lters. Replace as needed.

Damaged or blocked blower Verify blower rotates freely. Clear blockage.

ENVIRO-TEC

Fan motor starts

but stops. [EC

motor]

EC motor speed cannot be adjusted

EC motor runs in reverse, doesn’t respond to speed adjustment

FORM ET115.24-NOM11 (118)

Voltage or ground loss at motor Verify proper voltage and ground at motor.

Blower blocked

Clear blockage. Verify blower rotates freely with motor disconnected.

Verify operation of thermostat or controller. Verify fan

Loss of fan speed command.

speed command at relay board. Refer to Fan Relay board troubleshooting guide.

Use amp meter to verify motor amps. Disconnect power from unit. Verify motor rotates freely by hand with blower

Motor overloaded

disconnected. If not, replace motor. Note: EC motors

may not rotate freely as the rotor aligns with the stator

magnets.

Open ductwork Verify ducts sealed properly.

Verify dampers, if present, are not closed. Verify there

Motor overheated due to lack

of airow

are no obstructions in the discharge ductwork and/or at

the plenum opening. Verify lter is not dirty and does not obstruct airow.

Voltage or ground loss at motor

PWM board error or faulted

Verify proper voltage and ground at motor power

terminals.

Refer to PWM board status LEDs. Verify all connections. Cycle power to the board. Refer to PWM board IOM.

Motor fault or end of life. Replace motor.

Faulty motor harness

PWM board error or faulted

Improper wiring connections

EC wiring harness damaged or improperly seated

No control signal

Reseat connector and verify operation. Disconnect motor harnesses and verify continuity. Replace motor harness.

Refer to PWM board status LEDs. Verify all connections. Cycle power to the board. Refer to PWM board IOM.

Verify wiring. If Fan Relay board present, verify all jumpers installed.

Unplug harness and re-install, making sure plugs are fully seated. See section on checking wire harnesses, below. Replace harness if damaged.

EC motors may run at idle speed if they lose PWM signal while enabled.

Verify PWM signal at motor connector. Refer to PWM board IOM.

Verify dampers, if present, are not closed. Verify there

ESP (external static pressure)

too high

are no obstructions in the discharge ductwork and/or at

the plenum opening. Verify lter is not dirty and does not obstruct airow.

Motor Control failure Replace motor.

ENVIRO-TEC

Excessive fan noise

FORM ET115.24-NOM11 (118)

Motor mounting bolts loose Tighten motor mounting bolts.

Motor shaft bent Replace motor.

Disconnect power from unit. Verify motor rotates freely

Motor bearing end of life

by hand with blower disconnected. Note: EC motors

may not rotate freely as the rotor aligns with the stator

magnets.

Verify static pressure per system design. Use amp meter

Motor overloaded

to verify motor amps. Disconnect power to unit. Verify motor rotates freely with power disconnected. If not, replace motor.

Motor end of life Use amp meter to verify motor amps. Replace motor.

Dirty lters Verify lters. Replace as needed.

Obstructed airow

Improper duct connections

Verify blower is unobstructed. Verify no duct obstruction. Verify dampers are full open.

Verify ductwork is installed per SMACNA and ASHRAE guidelines.

Static pressure too low Verify static pressure per system design.

Improperly balanced system Verify airow through connected ductwork

Fan wheel rubbing on fan housing

Align wheel in housing.

Loose fan wheel Align and tighten.

Damaged fan wheel

Inspect fan wheel to verify ns are not bent. Replace blower as needed.

Imbalanced fan wheel Inspect fan wheel. Replace as needed.

ENVIRO-TEC

COOLING SYSTEM TROUBLESHOOTING GUIDELINES

Problem Possible cause Corrective action

Insucient airow Verify proper airow.

Dirty water coil Check cleanliness of water coil. Clean as needed.

Verify operation of drain pan float switch, if present.

Disonnect switch and use volt-ohm meter to verify continuity

of switch and of wiring. Replace switch if faulty.

Verify cooling valve opens with call for cooling. Verify all manual valves are open.

Verify coil is unobstructed. Verify all manual valves are open and have liquid ow through system.

Charge to proper cooling.

Verify coolant ow in coil. Verify proper ow per system design.

Verify cooling signal at 'Y' terminals. Verify thermostat setting/operation.

Insucient

cooling

[24V units] Drain pan float

switch fault

Cooling valve not operating properly

Insucient ow Verify liquid ow per system design.

Obstructed coil

[DX coils] Improper refrigerant

charge

[DX coils] Insucient cooling

liquid to coil

No call for cooling.

Air leak in ducts/unit Verify integrity of unit. Verify ducts are properly sealed.

Pipe insulation Verify pipes are properly insulated

Unit sweats

Damaged insulation Verify insulation at point of sweating

Unconditioned air to unit Verify conditioned air to unit

Drain pan is clogged Locate and remove blockage.

FORM ET115.24-NOM11 (118)

ENVIRO-TEC

ELECTRIC HEATER TROUBLESHOOTING GUIDELINES

Problem Possible cause Corrective action

Insucient airow Verify proper airow.

Loss of demand.

Verify thermostat or control is calling for heating. Verify demand voltage is present at unit.

[24V units] Loss of demand. Verify 24V control signal at ‘W’ terminal during demand.

[24V units] Loss of 24V

No airow.

Verify integrity of fuse on Fan Relay Board and replace if

need be. Refer to Fan Relay Board Troubleshooting Guide.

Electric heat will not operate unless fan motor is enabled. Verify fan speed is commanded.

Disconnect primary limit wire harness (the purple wire

harness coming out of the heater section.) Verify continuity

Damaged primary limit wire harness

across wire harness. If no continuity, check if primary limit is tripped. If primary limit is veried good, remove

power from unit, disconnect primary limit wire harness, and

measure continuity of wire harness. Replace if bad.

Verify no loss of demand to unit. Verify that voltage exists on magnetic heater contactor during demand for heat. If

demand reaches unit but not contactor, primary limit is

tripped. The primary limit switch(es) will auto-reset once the unit cools down. If unit is hot, wait for heater to cool down. This may take up to an hour.

The secondary limit may be manually reset. If unit is hot, wait for the heater to cool down. This may take up to an hour. Reset switch(es). Verify if heater will start.

With power removed, disconnect heater wire harnesses. (These are the harnesses with the black plugs.) Use a

volt-ohm meter to measure resistance across the electric

heat power harness coming out of the heater section. If

Electric Heat will not operate

CAUTION: UNIT MAY BE EXTREMELY HOT. TAKE GREAT CARE WHEN TROUBLESHOOTING.

Primary limit switch tripped.

Secondary limit switch tripped.

Improper wiring connections Verify wiring to schematic.

Open or damaged heater elements

the meter measures an open or shorted circuit, inspect the

heating elements.

Damaged electric heat wire harness

With power removed, disconnect heater wire harnesses. Use

a volt-ohm meter to verify continuity ofelectric heat power

harness wires in the control enclosure section.

With power removed and heater cool, remove primary limit

Primary Limit switch fault

switch. Verify continuity across switch. Replace switch if open.

With power removed and heater cool, remove secondary

Secondary Limit switch fault

limit switch. Verify switch is reset. Verify continuity across switch. Replace switch if open.

Verify heating demand voltage is at magnetic electric heat

contactor control coil terminals. If power is present but

[Magnetic contactor] Electric

heat contactor fault

contactor is not actuated, replace contactor. To verify

contactor: with power removed, unwire contactor and verify

continuity across contacts when manually operated. Cover

of contactor will need to be removed to access manual

operator. Replace contactor if faulty.

FORM ET115.24-NOM11 (118)

ENVIRO-TEC

FORM ET115.24-NOM11 (118)

Electric Heat will not operate (cont’d) CAUTION: UNIT MAY BE EXTREMELY HOT. TAKE GREAT CARE WHEN TROUBLESHOOTING.

Electric Heat shuts down unexpectedly

CAUTION: UNIT MAY BE EXTREMELY HOT. TAKE GREAT CARE WHEN TROUBLESHOOTING.

Electric heater is overheating

CAUTION: UNIT MAY BE EXTREMELY HOT. TAKE GREAT CARE WHEN TROUBLESHOOTING.

[Solid state relay] electric heat safety

contactor fault

[Solid state relay] Solid State Relay

fault

[Solid state relay proportional control] Heat controller fault

Loss of demand.

[24V units] Loss of demand.

Primary limit switch tripped.

Secondary limit switch tripped.

Loss of fan speed command. Heater will not operate if fan is not enabled.

Intermittent control device

Loose wiring Verify and/or tighten all wiring connections.

Insucient airow

Improper duct connections

Obstructed ductwork

Intermittent fan Verify fan motor runs continuously, providing even airow.

Incorrect voltage applied. Verify proper voltage to unit per unit label.

Improper wiring connections

Damaged heater elements

Shorted magnetic heater contactor

[Solid state relay] Shorted solid

state relay

Verify control voltage is at magnetic electric heat contactor control

coil terminals. If power is present at coil but contactor is not actuated, replace contactor.

Verify heating demand (control voltage) is at solid state relay control terminals. If power is present but relay is not actuated, replace relay.

Verify DC control signal is present at controller input terminals.

Verify that output control voltage to solid state relay varies with

variation in input. Replace controller if not.

Verify that thermostat or control command signal is not dropping

out. Verify voltage is present at unit during demand for heat.

Verify that signal from thermostat or control is not dropping out. During demand, there needs to be 24V on 'W1' terminal of Fan Relay board.

Verify no loss of demand to unit. Verify that voltage exists on heater contactor during demand for heat. If demand reaches unit but not contactor, primary limit is tripped. The primary limit switch(es) will auto-reset once the unit cools down. If unit is hot, wait for heater to cool down. This may take up to an hour. If limit trips again, verify heater is not overheating.

The secondary limit may be manually reset. If unit is hot, wat for the heater to cool down. This may take up to an hour. Reset switch(es). If limits trip again, verify heater is not overheating.

Verify operation of any control device such as drain pan oat switch, freeze stat, thermostat, etc. When in doubt, jumper out and verify fan operation.

Verify that airow is sucient to provide a minimum of 70 CFM per kW of electric heat.

Electric heaters require even airow across the face of the heater in order to operate properly. Verify ductwork is installed per SMACNA and ASHRAE guidelines.

Verify no obstructions. Verify all dampers are full open while fan operates.

Verify wiring to schematic. If Fan Coil Relay board present, verify all jumpers and harnesses installed. Refer to Fan Coil Relay Board Troubleshooting Guide.

Remove power from unit. Access the heater compartment. Verify heating elements are undamaged.

Remove thermostat or control command signal. Verify no control voltage to heater contactor. If electric heat continues to operate and all wiring has been veried, replace contactor.

Remove thermostat or control command signal. Verify no control voltage to solid state relay. If electric heat continues to operate and all wiring has been veried, replace solid state relay.

ENVIRO-TEC

Insucient

heating

CAUTION: UNIT MAY BE EXTREMELY HOT. TAKE GREAT CARE WHEN TROUBLESHOOTING.

FORM ET115.24-NOM11 (118)

Verify that thermostat or control command signal is not dropping

Intermittent demand for heating.

Heater is short cycling Verify thermostat settings. Verify proper location of thermostat.

Open or damaged heater elements

Loss of stage

Incorrect voltage applied. Verify proper voltage to unit per unit label.

Electric heat contactor fault

Primary limit switch cycling.

out. Verify voltage is continuously present at unit during demand for heat.

With power removed, disconnect heater wire harnesses. (These are the harnesses with the black plugs.) Use a volt-ohm meter

to measure the resistance across the electric heat power harness

coming out of the heater section. Verify ohms approximately equal to (Unit Volts)2/Unit kW.

Loss of demand for second stage. Verify demand voltage at stage 2 contactor.

Verify heating demand voltage is at each electric heat contactor

control coil terminals. If power is present but contactor is not actuated, replace contactor. To verify contactor: with power

removed, unwire contactor and verify continuity across contacts

when manually operated. Cover of contactor will need to be removed to access manual operator. Replace contactor if faulty.

Verify no loss of demand to unit. Verify that voltage exists continuously on heater contactor during demand for heat. If demand reaches unit but not contactor, primary limit is tripped. The primary limit switch(es) will auto-reset once the unit cools down. If unit is hot, wait for heater to cool down. This may take up to an hour. If limit trips again, verify heater is not overheating.

ENVIRO-TEC

ENVIRO-TEC is a mark and/or registered mark. Unauthorized use is strictly prohibited.

Enviro Series D, HL SERIES Installation Operation & Maintenance

Specifications and Main Features

Frequently Asked Questions

User Manual