Enviro VDD, HDD Installation Operation & Maintenance

DIRECT DRIVE BLOWER-COIL UNITS

INSTALLATION, OPERATION & MAINTENANCE

Model VDD

Form ET115.24-NOM12 (718)

Model HDD

TABLE OF CONTENTS

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

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

FORM ET115.24-NOM12 (718)

Section One - Receipt & Initial Installation

Direct Drive Blower-Coil Series Features......... 2

Preface ................................... 2

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

Code Compliance...........................3

Handling and Installation ..................... 3

Unit Rigging and Placement...................4

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

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

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

Ductwork Connections . . . . . . . . . . . . . . . . . . . . . . . 6

Electrical Connections ....................... 6

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

Condensate Drain and Traps . . . . . . . . . . . . . . . . . . 8

Service and Clearance Requirements ........... 9

Clearance ................................ 11

Section Two - Start-Up

General.................................. 12

Cooling/Heating System.....................12

Air System Balancing ....................... 12

Motor & Fan Data .......................... 13

Water System Balancing .................... 13

Controls Operation ......................... 13

Section Three - Normal Operation &

Periodic Maintenance

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

Motor/Blower Assembly ..................... 14

Coil .....................................15

Electric Resistance Heater Assembly........... 15

Electrical Wiring & Controls .................. 16

Filters, Throwaway ......................... 16

Drain....................................17

Optional Item Installation .................... 17

Condensate Float Switch Installation........ 17

Replacement Parts......................... 18

Section Four - Discrete Components

Fan Motor Control.......................... 19

Installation ............................... 19

Reference Wire Diagram .................... 20

Inputs and Outputs ......................... 21

Tools Needed for Installation/Troubleshooting .... 21

Jumpers ................................. 21

Checking Wire Harnesses ................... 22

Section Five - Troubleshooting

Discrete Components....................... 23

EC Motor ................................ 24

Cooling System ........................... 24

Electric Heat .............................. 25

ii

Section Six - Inspection &

Start-Up Checklist

Inspection & Start-up Checklist ............... 29

ENVIRO-TEC

FORM ET115.24-NOM12 (718)

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.

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.

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.

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

ENVIRO-TEC

1

SECTION ONE - RECEIPT & INITIAL INSTALLATION

Direct drive fan
and EC motor

1" duct collar
allows for quick
connection of
duct work

Three different EC
motor control options

Door interlocking
disconnect

DIRECT DRIVE BLOWER-COIL FEATURES

Optional closed cell
foam insulation

NEMA 1 control enclosure
houses disconnect,
fusing, and more

3, 4 or 6 row cooling coil
with 1 or 2 row heating coil
in preheat or reheat

FORM ET115.24-NOM12 (718)

Hanger
holes in
top and
bottom
panels for
thru rod
installation

Auxiliary drain
pan connection

Access panels on both
sides for easy access
to blower and motor

PREFACE

ENVIRO-TEC direct drive blower-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 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.

2

ENVIRO-TEC

FORM ET115.24-NOM12 (718)

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.

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
to conform to UL Standard for Heating and Cooling
Equipment, UL 1995 (4th Edition) and to CSA Standard
C22.2 No. 236. It bears the ETLc listed mark under
Intertek Client #41629.

HANDLING AND 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 must be maintained in an

upright position and handled by the chassis as close as

possible to the mounting point locations.

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

ENVIRO-TEC

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.

3

FORM ET115.24-NOM12 (718)

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, coil,

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

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

in immediate or premature failure. All manufacturers’

warranties are void if foreign material is 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.

UNIT RIGGING AND PLACEMENT

Install ductwork to comply with ASHRAE Fundamentals
Handbook, SMACNA, NFPA 90A and local code.

The installation must conform with local building codes

and the National Electric Code.

Locate unit support in accordance with the mechanical
and structural plans. If so equipped, locate the isolator

placement and correct size as shown on the submittal

drawing.

Ceiling suspension of horizontal units have factory

provisions for thru bolt hanger rods. If oor mount

isolators are required for either horizontal or vertical

units, then factory or eld provisions must be made
for isolator attachment. Vertical units can be mounted
directly to the oor or on a base rail. For units with
isolators but no base rail, 6" legs are required and will
need to be mounted to the base of the unit. If a base rail

is provided, isolators can be installed in mounting holes

provided on this base rail.

Do not handle the unit using coil stubout connectors, as

damage may occur at brazed joint(s).

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

Figure 1a: Side view

Threaded rod

Unit

Figure 1b: Installation detail

Nut

Washer

Optional
vibration
isolator

4

Figure 1a-1b: Typical ceiling installation

ENVIRO-TEC

DRAIN PAN

Standard drain pans are constructed of single wall
galvanized steel (with an option for stainless steel)
and sit on insulation. The drain protrudes from the unit

cabinet and can be equipped with a secondary drain

connection. See illustration below.

COILS

All blower-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.

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 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.

FORM ET115.24-NOM12 (718)

Figure 2a

Figure 2b

Figure 2a-2b: Drain pan access

ENVIRO-TEC

5

FORM ET115.24-NOM12 (718)

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 are to be eld provided

and installed as required and all service valves should

be checked for proper operation. Refer to the valve
component manufacturer’s IOM manual for proper
installation, troubleshooting, and operational guidance.

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

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

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

All leaks should be repaired before proceeding with

the installation.

DUCTWORK CONNECTIONS

All ductwork and/or supply and return grilles (provided
by others) 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 are 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.

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.

6

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
unit-wiring diagram shows all unit and eld wiring
connection points. Since each project is different and

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

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

ENVIRO-TEC

FORM ET115.24-NOM12 (718)

ELECTRICAL ENCLOSURE

Figure 3: Electrical enclosure

The electrical control enclosure provides access to

the electrical compartment. This compartment houses
all electric heat and control components. Terminals

are furnished for simple power and control wiring

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

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. For electrical devices that
are eld mounted and provided by others, please refer to
the original manufacturer’s IOM for proper installation,
troubleshooting and operation guidance. Failure to do so

could result in personal injury or damage to components

and will void all manufacturer’s 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/CSA 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.

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 connections should be
periodically checked for tightness.

ENVIRO-TEC

7

CONDENSATE DRAIN AND TRAPS

Trap detail for negative

cabinet static pressure

Trap detail for positive

cabinet static pressure

NO BASE RAIL

Housekeeping pad
Required to accommodate
trap height

WITH BASE RAIL

Depending on static

pressure, housekeeping
pad may not be needed
for trap installation

WITH BASE RAIL AND
HOUSEKEEPING PAD

Drain lines should be at least the same size as the drain

pan connection. Properly sized traps should be used to

allow the condensate from the coils to drain from the

drain pan. See Fig. 4.

FORM ET115.24-NOM12 (718)

Figure 4: Condensate drain and traps

8

LD13929

ENVIRO-TEC