Indoor Packaged equIPement
InstallatIon, oPeratIons, maIntenance
VertIcal stacked water source Heat PumP
model VB/Vm/Vs09-36 caBInet
model Vscs09-36 cHassIs
Supersedes: ET145.18-IOM1 (513) Form ET145.18-IOM1 (115)
and
LD18013LD18014
r-410a
Issue Date:
January 21, 2015
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDLINES
This equipment is a relativ ely complicated apparatus.
During installation, operation, maintenance, or
service, individuals may be exposed to certain
components or
refrigerants
components, and both high and low voltage. Each of
these items has the potential, if misused or handled
improperly, to cause bodily injury or death. It is the
obligation and responsibility of operating/service
personnel to identify and recognize these inherent
hazards, protect themselves, and proceed safely in
completing their tasks. Failure to comply with any of
these requirements could result in serious damage to
the equipment and the property in which it is situated,
The following symbols are used in this document to alert the reader to areas of potential hazard.
conditions i ncluding, but not limit ed to:
, oils, materials under pressure, rotating
SAFETY SYMBOLS
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 de ath or serious
injury.
All wiring must be in accordance with publishe d specifications and must be performed ONLY
by qualified service personnel. The manufacturer will not be responsible for damages/problems
resulting from improper connections to the contr ols or appli ca tion of impr oper contr ol si gnals .
Failure to follow this will void the manufacturer’s warranty and cause serious damage to property
or injury to persons.
FORM ET145.18-IOM1 (115)
as well as sever personal injury or death to themselves
and people at the site.
This document is intended for use by owner-authorized
operating/service personnel. It is expected that this
individual possesses independent training that will enable them to perform their assigned tasks properly and
safely. It is essential that, prior to performing any task
on this equipment, this individual shall have read and
understood t his document a nd any referenced materia ls .
This individual shall also be familiar with and comply with
all applicable governmental standards and regulations
pertaining to the task in question.
CAUTION identifies a hazard which could
lead to damage to t he machine, damage
to other equipment an d/or envir onmental
pollution. Usually and instruction w ill be
given, together with a brief explanation.
NOTE is used to highlight additional information which may be helpful to you.
ENVIRO-TEC 2
FORM ET145.18-IOM1 (115)
In complying with the manufacturer’s policy for continuous product
improvement, the information contained i n this document is subject
to change without notice. While ENVIRO-TEC makes no
commitment to up-date or provide current inform ation automatically
to the manual owner, that information, if applicable, can be obtained
by contacting the nearest ENVIRO-TEC service office.
CHANGEABILITY OF THIS DOCUMENT
It is the responsibility of operating/service personnel as to the
applicability of these documents to the equipment in question. If
there is any question in the mind of operating/servic e personnel as
to the applicability of these doc uments, then, prior t o working on the
equipment, they should verify with the owner whether the equipment
has been modified and if current literature is available.
TABLE OF CONTENTS
NOTICE & DISCLAIMER………………………………………..………………...…………………………..... 4
PREPARING TO INSTALL UNIT………………………………………..………………...…………………... 4
Literature………………………………………..………………...…………………………………........... 4
Shipping………………………………………..………………...…………………………………............ 4
Inspection & Storage………………………………………..………………...…………………………… 4
Pre-Installation………………………………………..………………...………………………………….. 4
Rigging………………………………………..………………...………………………………….............. 5
RISER/CABINE T INSTALLATION………………………………………..………………...………………... 11
Cabinet Placement………………………………………..………………...………………………….… 11
Supply and Return Piping………………………………………..………………...……………………. 12
Hoses………………………………………..………………...………………………………….............. 12
ELECTRICAL WIRING……………………………… ………..………………...…………………………….. 15
Field Installed Power Wiring………………………………………..………………...…………………. 15
Field Installed Low Voltage Wiring………………………………………..………………...………….. 15
Optional Surface Mount Thermostat Connection Wiring………………………………………..……. 15
Optional Remote Mounted Thermostat Wiring………………………………………..………………. 15
Optional ADA Door Mounted Thermostat………………………………………..………………...….. 16
ECM Continuous Fan………………………………………..………………...……………………….... 16
CLOSET & DRYWALL INSTALLATION………………………………………..………………...…………. 16
ACOUSTIC RETURN AIR PANEL………………………………………..………………...………………... 16
SUPPLY AIR DUCTWORK………………………… ……… ……. .… ……………...………………………... 20
Horizontal Supply Air………………………………………..………………...…………………………. 20
Top Discharge Supply Air………………………………………..………………...……………………. 20
TOP MOUNTED FRESH AIR SUPPLY OPENING………………………………………..…………….... 23
Top Mounted Fresh Air………………………………………..………………...………………………. 23
Top Mounted Fresh Air with Motorized Damper………………………………………..…………….. 23
CHASSIS INSTALLATION………………………………………..………………...……………………….... 25
Units with NPSH Valve Connection and Hose Sets………………………………………..……….... 25
Units with NPT-Style (Tapered Pipe Thread) Valve Connection and Hoses.............. .... .. .. . .. .. .. .. .. 25
UNIT START-UP……………….………………………………………….................................................... 27
Pre-Start-up Checklist………………………………………..………………...………………………... 27
Initial Unit Start-up.......................................................................................................................... 27
System Loop Temperature........ ..................................................................................................... 27
FAN SPEED ADJUSTMENT……………………………. ………………................................................... 28
MAINTENANCE…………………….………………..…………………...................................................... 30
UNIT CONTROLS…………………………………….…………………….................................................. 30
SYSTEM FLUSHING AND CLEANING……………………………………............................................... 33
APPENDIX
Wiring Diagrams………………………………………..………………...…………………………….... 34
R-410A Quick Reference Guide...….............................................................................................. 38
ENVIRO-TEC 3
After installing the unit, show the user how to turn
off the electricity to unit. Point out control and
switch locations for turning off the electricity.
Make sure user understands the importance of
following all safety precautions.
1. NOTICE & DISCLAIMER
As originally manufactured, this unit contains refrigerant
installed by the manufacturer. The manufacturer uses only
refrigerants that have been approved for use in the unit’s
intended country or market. The manufacturer’s distributors
similarly are only authorized to provide refrigerants that have
been approved for use in the countries or markets they serve.
The refrigerant used in this unit is identified on the unit's
faceplate and/or in the associ ated manuals. Any additions of
refrigerant into this unit must comply with the country’s
requirements with regard to refrigerant use and should be
obtained from the manufacturer’s distributors. Use of
unapproved refrigerant substitutes will void the warranties and
can cause injury or death.
DISCLAIMER
Customer modific ations to ENVIRO-TEC certified product s are
prohibited.
The manufacturer has certified the product as being compliant
with applicable government and/or industry standards. Product
certification is designated either on the produc t itself or in the
product literature. The certification mark identifies the
applicable standards as well as the Nationally Recognized
Test Lab (NRTL) or other testing facility that conducted the
testing, where applicable. If changes are made to the product,
an engineering review will be needed to assess the impact to
the product certification. In some instances, the changes may
be such that the NRTL or testing facility will need to review and
potentially re-approve of the product by means of a field or site
inspection and certification. Any person or entity making
changes to the product is responsible for obtaining any
necessary engineering review and re-approval. Unaut horized
customer modifications to ENVIRO-TEC products are
prohibited for the following reasons:
A. Modifications may create hazards which could result in
death, serious injury or equipment damage.
B. Modifications will void product warranties.
C. Modifications may invalidate product certifications.
Modifications may violate Country standards. Country
standards may require that only certified products be
used in certain applications, and modificat ions that result
in the loss of product certification may violate those
standards.
2. PREPARING TO INSTALL UNIT
A. Literature
Review this Manual and the Users’ Manual Information.
After installing the unit; give this Installer’s Inform ation Manual
to the end user. If you need help on any of the installation
instructions or other matters relating to the unit, contact the
office where you bought the unit. You may also refer t o the
unit rating plate for a contact name.
B. Shipping
Cabinets and risers are shipped in one of the following
configurations:
A. Risers are attached to cabinet, and cabinets are stacked
on their side. Chassis ships on separate skids.
FORM ET145.18-IOM1 (115)
B. Risers ship loose packaged in boxes and s orted by floor.
Cabinets ship upright up to 4 per s kid. Chassis ships on
separate skids.
C. Risers ship loose in packaged boxes, sorted by floor.
Cabinets ship upright on skids with chassis inside cabinet
(chassis electrical and water connections are not
installed). Cabinet must remain standing upright. Do not
place cabinets on their side with chassis inside. Chassis
is secured to service panel. Remove screws before
removing service panel and chassis.
C. Inspection & Storage
Cabinets, chassis and risers should be stored in the sam e way
they were shipped. Store in a dry area and ensure chassis
units are always in their upright position. If risers are being
stored at the job site ensure the ends are capped to prevent
contamination.
In areas where construction is not complete—including dry
walling, plastering, painting, and where emission of dust
particulates or fumes from out-gassing are present—all
precautions must be taken to protect the cabinet, cabinet
openings, and chassis from physical damage and
contamination by foreign material.
A. Check the unit for indications of damage in shipment.
Notify the Transportation company of any damage and
note the damage on the shipping receipt.
Rough handling may dislocate and damage internal
components.
B. Check riser projections at each end of the cabinet for
misalignment or end damage that would prevent mak ing
an acceptable connection.
C. Thermostats and other accessories which have been
shipped separately should be inspected f or quantity and
transit damage.
D. Store the refrigeration chassis in the normal upright
orientation to maintain oil in the compressor sump.
D. Pre-Installation
A. Verif y the model number on the unit nameplate with the
ordering and shipping information, to ensure the correct
unit has been shipped.
B. All cabinets may not be equipped with the same size
riser, or the same air supply grille arrangement. Carefully
inspect each unit before delivery to the installation site. In
most cases, each cabinet will be indi vidually tagged for a
specific location in the building.
C. Keep the cabi net sealed with the s hipping materials until
all plastering, painting and construction work is complete.
D. Remove the inner service panel , and manual ly check the
blower wheel for free rotation.
E. Match the refrigeration chassis to the proper cabinets by
referring to the cabinet and chassis nam eplate and label
information.
F. Remove the chassis refrigeration access panel (top
cover) and inspect the unit. Ensure that the refrigerant
tubing is free from obvious physical damage and kinks,
and check that piping does not touch other unit
components.
ENVIRO-TEC 4
G. The compressor is mounted on neoprene isolators with
metal spacing sleeves inside and secured with nuts,
which must be snug against the metal spacer sleeves.
H. Inspect all electrical connections. Connections must be
clean and tight at the terminals.
DO NOT USE THE RISERS TO LIFT THE CABINET
ASSEMBLY!
DO NOT install this unit outdoors.
A compressor/unit comprises a pressurized
system. Never Loosen threaded joints while the
system is under pressure and never open
pressurized system parts.
Before servicing, open and tag all disconnect
switches.
Do not install units in a flammable environment due
to the danger of an explosion.
Safety guards, shields, barriers, covers and
protective devices must not be removed while the
compressor / unit is operating.
FORM ET145.18-IOM1 (115)
E. Rigging
All safety features, disengagement and interlocks
must be in place and function correctly before the
equipment is put into operation. Never by-pass or
wire around any safety device.
Use gloves and protective goggles and where
appropriate, make sure to have a gas mask close at
hand. Also use electrical protection equipment and
tools suited for electrical operation purposes.
Personnel must be qualified according to national
safety rules and regulations.
The system should be installed by manufacturerqualified personnel. If not, it may cause water
leakage, electric shock or fire.
Follow all applicable regulations and safety practices during
rigging and lifting. Prepare and follow written rigging and lift ing
plan. Lifting must be directed by trained professional rigger.
Spreader bars must be used and be long enough to prevent
rigging from contacting unit. Use all and only designated lift
points according to unit's Manual(s). Locate center of gravity
through trial lifts to account for possible variations in unit
configuration. Use rigging and lifting techniques that keep unit
stable and level. Keep clear of unit when lifted.
ENVIRO-TEC 5
FIGURE 1 – Cabinet & Chassis Model Nomenclature
FORM ET145.18-IOM1 (115)
ENVIRO-TEC 6
FORM ET145.18-IOM1 (115)
ENVIRO-TEC 7
Mod el Ser ies 09 12 15 18 24 30 36
Nominal Cooli ng (Ton)
1
0.75 1.0 1.25 1 .5 2.0 2.5 3.0
Compressor Type
Refr i gera nt C ha rge (o z) 21 25 34 38 44 48 50
Air Coil-Type
Fa ce Area (sq ft) 1.46 1.56 2.35 2.35 2.63 3.33 3.33
Rows /FPI 2/16 3/14 3/14 3/14 3/14 3/14 3/14
Water Coil-Type
Standard Bl ower/Motor
Diameter x Width (in) 9x4T 9x4T 9x7T 9x7T 9x7 9x8 9x8
Motor HP 0.10 0.10 0.17 0.17 0.25 0.33 0.50
Hi -Sta tic Bl ower /Motor
Diameter x Width (in) 9x4T 9x4T 9x7T 9x7T 10x7T 10x8T 10x8T
Motor HP 0.10 0.10 0.17 0.25 0.33 0.33 0.50
ECM Blower/Motor
Diameter x Width (in) 9x4T 9x4T 9x7T 9x7T 10x7T 9x8 9x8
Motor HP 0.33 0.33 0.33 0.33 0.33 0.50 0.50
Hi -Sta tic ECM Bl ower/Motor
Diameter x Width (in) 9x4T 9x4T 9x7T 9x7T 10x7T 10x8T 10x8T
Motor HP 0.33 0.33 0.33 0.33 0.33 0.50 0.50
Filter Quantity-Size (in) 1-14x25x1 1-14x25x1 1-16x30x1 1-16x30x1 1-16x30x1 1-20x30x1 1-20x30x1
Cabinet Weight (lb)
2
130 130 145 145 150 175 175
Chassi s Weight (lb) 70 75 95 100 140 155 160
DWDI Forward-Curved Centrifugal / ECM Direct-Drive
DWDI Forward-Curved Centrifugal / ECM Direct-Drive
Rota ry
Scrol l
Enhanced Copper Tubes, Enhanced Aluminum Fins
Enhanced Surface Co-Axial
DWDI Forward-Curved Centrifugal / PSC Direct-Drive
DWDI Forward-Curved Centrifugal / PSC Direct-Drive
TABLE 1 – Physical Data
FORM ET145.18-IOM1 (115)
1) Nominal Capacity calculated in accordance with ARI/ISO Standard 13256-1 for Water Loop Application.
2) Cabinet weight is approximate and does not include weight of risers.
ENVIRO-TEC 8
FORM ET145.18-IOM1 (115)
80"
or
88"
B A
6
48
4.5
3
50
7
OPTIONAL 24V
CONNECTION FOR
SURFACE-MOUNT/
REMOTE MOUNTED
THERMOSTAT
SWITCH PLATE w/
2-SPD FAN SWITCH
(OPTIONAL:
DISCONNECT/
FUSES,
ADA MOLEX CONN.)
7/8" CONTROL
ENTRANCE
CHASSIS
SERVICE
PANEL
ELECTRICAL BOX
OPTIONAL
FRONT SUPPLY
OPENING
RETURN AIR
FLANGE
STANDARD 1 IN.
LEFT VIEW
FRONT VI EW
SERVICE
HOSES
PASS-THRU
RISER
OPENING
KNOCK-OUTS
(ALL 3 SIDES)
Mode l A B
R.A Flange
Wi dth
09-12 17 17 16
15-24 20 20 19
30-36 24 24 23
Cabi net Dimensions
Note:
1) Supply, Return, and Condensate riser openings are pre-punched on all sides and field convertible. Cut tabs to remove knock-out.
2) Supply and Return openings are 4” x 2.5”. During riser installation, ensure stub-out is centered in supply and return openings.
3) Condensate P-trap is accessible from front by removing bottom cover plate.
4) Riser and shut-off location is measured from base of cabinet and does not include stand height.
FIGURE 2 – Cabinet Unit Dimensions & Floor Sleeve Dimensions
ENVIRO-TEC 9
FORM ET145.18-IOM1 (115)
Note:
1) Riser shut-off valve is measured from base of cabinet and does not include st and hei ght.
FIGURE 2A – Cabinet Riser Dimensions
ENVIRO-TEC 10
FORM ET145.18-IOM1 (115)
3. RISER / CABINET INSTALL ATION
A. CABINET PLACEMENT
Refer to Figure 2, which shows the correct location of the
cabinet in relation to the floor sleeve and risers.
Do not use the risers to lift or move cabinets.
Risers must not be used to lift cabinets. Risers are not
designed to support or lift any part of the cabinet. Risers are
attached using nylon ties to allow for slight adjustments during
installation, and expansion of riser column during operation.
Care must be taken during installation to avoid damage to
risers and riser stub-outs.
Improper handling and installation of risers could
damage riser stub-outs and valves could result in
property damage, death or serious injury.
Do not allow the risers to bottom out. Riser stub-out
should be centrally located with cabinet riser stubout opening. Do not allow riser stub outs or risers
to contact cabinet sheet metal.
Do not drag risers on floor while moving the
cabinet.
For orders where risers are shipped loose, riser installation
can be done first before installation of cabinets. During riser
installation ensure riser stub-outs will be centered in the
cabinet openings. Do not allow risers to bottom out in swage.
Where risers are shipped attached to cabinets, installation of
risers and cabinets is done at the same time without the need
to detach risers from cabinet.
1. Place the cabinet in a horizontal position on the floor
adjacent to its installation location (when risers are
attached to cabinet).
2. The units are designed to accommodate a maximum
supply and return riser stub-out movement of 1-1/2
inches, due to expansion and contraction (total movement
of 3 inches). If the total calculated riser expansion or
contraction exceeds 1-1/2 inches, field installed
expansion compensation must be provided.
The initial positioning of the riser stub-out is correct when
the top of the riser pipe is 3 inches above the t op of the
cabinet (applies to standard riser models only:
VBR/VMR/VBS)
3. If the installation requires the use of field or factory
provided riser extensions, install the extensions to the
unit-mounted risers prior to moving the cabinet i nto final
position.
4. Raise the cabinet upright and lower the ris ers t hrough the
floor cut-out, aligning the risers into the swaged section of
the unit on the floor below.
Take extra care not to scrape or dent risers during
positioning. The riser tailpiece should insert
approximately 2" into the 3" long swaged section of
the unit below.
To ensure correct riser positioning, and to
compensate for variations in floor-to-floor
dimensions, DO NOT allow the riser tailpiece to
bottom out into the swaged section.
5. Center the risers in the pipe chase, and level t he cabinet
using shims as necessary.
6. Plumb risers in two planes to assure proper unit operation
and condensate drainage.
7. Placing cabinets on vibration isolation pads is
recommended to reduce noise transmission into floor.
Anchor cabinets into place, using sheet metal angles.
Do not drill, or drive screws into the cabinet in the
area of the internal drain pan.
8. Center the risers’ horizontal stub-outs (complete with
factory-installed shut-off valves) in the cabinet slot
openings. Ensure that the stub-outs are perpendicular to
the side/back panel.
9. Verify all risers are vertical and that they penetrate the
swaged joint at least 1". Factory provided risers come
with a 3 inch deep swage. Do not allow risers to
completely bottom out at 3 inches in the swage. The 3
inch swage depth is oversized t o allow for adjustments if
necessary to keep riser s tub-outs and valves centered in
the cabinet opening. Riser stub-out should be c entered in
cabinet opening to allow for expansion and contraction.
Riser stub-outs must not contact on any sheet metal
opening, otherwise damage can occur to stub-outs,
resulting in water leaks and property damage.
Correct Position of Stub-Out in Cabinet Riser Opening:
Incorrect Position of Stub-Out in Cabinet Riser Opening:
10. Braze or solder riser joints with industry accepted solder
or brazing rod material.
Riser system must be secured to building
structure. Cabinets are not designed to support
riser system.
11. The riser system must be secured, at a minimum of
one point, to the building structure. Cabinets are not
intended to support riser system! If the temperature
range of the system will exceed the allowed expansion
and contraction limits (1-1/2 inches maximum), riser
compensation provisions must be made by the installing
contractor.
ENVIRO-TEC 11
FORM ET145.18-IOM1 (115)
12. Ensure that individual unit shut-off valves remain closed
until the circulating loop system has been cleaned and
flushed.
B. SUPPLY AND RETURN PIPI NG
1. Install a drain valve, shut-off / balancing valves, flow
indicators, and drain tees at the bas e of each supply and
return riser to enable system flushing, balancing, and
servicing.
2. Install strainers at the inlet of each circulating pump.
3. Insulate loop water piping that runs through
unconditioned areas of the building, or outside the
building. When loop water temperature is maintained
between nominal operating limits of 60-90
not sweat or suffer undue heat loss at c onditioned space
temperatures.
4. Install vents in piping loop as required to bl eed residual
air from the piping system during filling and servicing.
5. Refer to the following diagrams for determi ning what riser
shut-off valves and hose kits are required for job specific
site conditions.
A. Factory supplied risers will come with the
appropriate hose kits with NPSH type fittings (see
Diagram A). Before attaching hoses check that the
female end gasket is not missing and free of
damage or debris. See Table 3 below for
information on replacement gaskets.
B. For fi eld supplied risers we recommend ordering the
appropriate NPSH type field hose kits from the
factory, complete with shut-off valves. Shut-off
valves are to be fi eld sweat connec ted to ris ers (see
Diagram B).
C. Legacy chassis with NPT type connections and
matching risers with NPT shut-of f valve connections
require a special hose kit complete with NPT to
NPSH swivel adapter on the shut-off valve and
chassis connection (see Diagram C) to mate to
factory hoses.
C. HOSES
Ensure the correct hose set is matched with the compatible
unit size, see Table 2. W hen installing NPSH fact ory provided
hoses installer must follow these procedures when installing
hoses:
1. Inspect for missing or damaged hose gas ket, see Tabl e 3
for replacement gasket part numbers.
2. Tighten by hand screw connections to m ale NPSH fitting
on shut-off valve. Hold ferrule stationary when tightening.
3. Tighten by hand then using a back up wrench tighten a
further quarter (1/4) turn only. Do not over-tighten!
o
F, piping will
When installing hoses do not apply a twist or
torque load on the hose.
When tightening hoses hold ferrule stationary by
hand while tightening the screw connections. Avoid
tight bends or water flow and high pressure drops
may occur.
Hose gasket does not require extreme tightening to
obtain a seal. DO NOT OVERTIGHTEN or damag e to
gasket or sealing surface will occur. Do not apply
thread sealant.
Table 2: Chassis Hoses
CHASSIS MODEL HOSE TYPE
09/12/15/18 1/2” NPSH FEMALE-FEMALE
24/30/36 3/4" NPSH FEMALE-FEMALE
Table 3: Replacement Hose Gaskets
REPLACEMENT GASKETS FOR NPSH HOSE KITS
Part No. Description
VSGK-UFHW-050 1/2" RUBBER GASKET
VSGK-UFHW-075 3/4" RUBBER GASKET
HOSES MUST BE HAND TIGHTENTED THEN
FURTHER TIGHTENED NO MORE THAN 1/4 TURN.
DO NOT APPLY EXCESSIVE FORCE!
ALWAYS USE A BACK-UP WRENCH WHEN
TIGHTENING HOSES TO VALVES! OTHERWISE
VALVE SOLDER JOINT MAY FAIL LEADING TO
PROPERTY DAMAGE OR SERIOUS INJURY!
ENVIRO-TEC 12
FORM ET145.18-IOM1 (115)
Diagram A -Standard Factory Supplied NPSH Hose Kits and Risers (As of June 2013)
Diagram B –Optional Field Supplied Risers w/ Factory Supplied NPSH Hose Kits and Shut-Off Valves
ENVIRO-TEC 13
FORM ET145.18-IOM1 (115)
* For VB cabinets built prior to June 2013
Diagram C – Conversion of NPT to NPSH type fittings (VB Units with NPT fittings only)*
ENVIRO-TEC 14
4. ELECTRICAL WIRING
RECOMMENDED
MAX. LOW VOLTAGE
20 gauge
50 feet
18 gauge
75 feet
16 gauge
125 feet
LOCK ALL ELECTRICAL POWER SUPPLY
SWITCHES IN THE OFF POSITION BEFORE
INSTALLING THE UNIT. F AILURE TO DIS-CONNECT
POWER SUPPLY MAY RESULT IN ELECTRICAL
SHOCK OR EVEN DEATH.
A. Field Installed Power Wiring
Power wiring to the equipment must conform to National and
Local Codes (NEC) by a professional electrician.
Provide each unit with its own separate electrical circuit,
means of circuit protection, and electrical disconnect switch.
Follow current National Electrical Code ANSI /NFPA 70, CSA
C22.1 C.E.C. Part 1, and state and local codes.
Failure to provide these shut-off means could cause
electrical shock or fire, resulting in damage, injur y
or death.
Use Copper Conductors Only!
Verify that the available unit power supply is compat ible with
the unit’s nameplate rating. Ensure breaker is properly sized
as per nameplate. Line voltage supply enters through the right
hand side of the cabinet at the 7/8” power entrance knock-out.
Connect to the line side of the f actory installed terminal bl ock.
Unit terminals are not designed to accept other types of
conductors. Failure to use copper conductors may result in
equipment damage.
B. Field Installed Low Voltage Wiring
Select a location for room thermost at that is away from supply
air registers, on draft-free interior wall, and not near lights,
television, direct sunlight, or other heat sources.
Thermostat connection within the unit is accomplished by
connecting the remote thermostat wiring to microprocessor low
voltage terminal strip. See Figure 4 for typical wiring
connections.
Locate thermostat away from suppl y drafts. Ensure
the back of thermostat is sealed and pr otected from
air drafts. Short cycling can result in damage to unit.
WIRE SIZE
WIRE LENGTH
FORM ET145.18-IOM1 (115)
FIGURE 4 – FIELD WIRING DIAGRAM
Ensure that the control wiring between the thermostat and the
unit’s terminations does not exceed 1 ohm.
Resistance in excess of 1 ohm may cause
component damage due to insufficient AC voltage
supply.
Check all loads and conductors for grounds, shorts,
or misfiring. Do not run the low voltage wiring in the
same conduit with the high voltage power wiring.
C. Optional Surface Mount Thermostat Connection Wiring
For applications where thermostat is mounted directly above
the return air panel, cabinet Control Option ‘P’ must be
selected (i.e. VB12P). Thermostat molex pigtail harness
(shipped loose to field) is field wired to thermostat terminals
and molex connector clips to mating panel mounted molex
connector on unit cabinet, located 7 inches above the electrical
box. See optional 24V surface mount connection in Figure 2.
D. Optional Remote Mounted Thermostat Wiring
For units ordered with extended thermostat harnes s option t he
thermostat is remote m ounted and specific extended harness
length can be ordered. Extended harnes s is plenum rated. Use
low voltage 7/8” knock-out on the side of the unit at the
electrical box to field wire the low voltage therm ostat wiring.
Using a plastic bushing pass harness inside electrical box to
factory wired mating molex harness. See Figure 5 below.
Thermostat pigtail molex harness is shipped loose for field
wiring to thermostat terminals.
ENVIRO-TEC 15
Optional
Disconnect
Optional
FIGURE 5 – Remote Thermostat Wiring
E. Optional ADA Door Mounted Thermostat
For units ordered with ADA thermostat option to meet the
Americans with Disabilities Act’s (ADA) requirements,
thermostat is located on the return air panel door, at a height
of 48 inches from the base of t he cabinet. Unit is supplied with
a custom return air door panel with thermost at mounti ng holes,
unit switch plate with molex connec tor, and ADA mol ex pigtail
harness. See Section 6, Figure 9A.
Wire leads from ADA thermostat harness are field wired to
thermostat terminals. Molex end of A DA thermostat harness is
field connected to surface mounted molex connector at unit
switch plate.
Mount thermostat using the factory provided 1/4” #8 screws.
ADA thermostat harness is plenum rated and will hang in
behind the return air door. For chassis servicing, unclip
harness from unit switch plate.
FORM ET145.18-IOM1 (115)
5. CLOSET & DRYWALL INSTALLATION
To avoid potential vibration and noise issues the
Return Air Panel should not contact any part of the
unit cabinet or sleeve. Maintain a sufficient gap
between R.A. Panel frame and cabinet!
1. Build a closet enclosure for the cabinet that will
incorporate the Return Air panel size while maintaining a
sufficient gap between the closet and cabinet to prevent
the cabinet from contacting the R.A. panel and closet
enclosure. Refer to Section 6 and Figures 7 & 8.
2. Before installing drywall around cabinet , cover the supply
and return openings with plastic or cardboard to prevent
dust or debris from entering the unit components.
3. Install drywall using conventional construction methods.
Studs or drywall should not
cabinet surface. The spacing of the framing members will
be dependent on the return air access and the type
/quantity of supply air outlets. See Figures 7 and 8.
4. Install sheetrock around unit cabinet by securing the
drywall to building construction studs. Cut holes around
the supply air and return air openings to allow acc ess to
the unit chassis, unit controls, and the supply air
connection.
5. Vacuum all dust and construction debris from the unit
drain pan, electrical box, and discharge plenum, after
cutting out the supply/returns openings.
To prevent electrical shorts, and drain pan leaks,
DO NOT penetrate unit components when driving
screws near the unit control box or drain pan. Do
not allow screws or nails to penetrate chassis,
risers, electrical junction boxes, conduits, or to
interfere with chassis removal.
be fastened directly to the
ADA Molex
Connection
FIGURE 6 – Unit Switch Plate with ADA Thermostat Connection
F. ECM Continuous Fan
This option features a factory wired continuous low speed fan
circuit. The EC motor (ECM), due to available five motor speed
taps, offers ideal range for supporting continuous low speed
fan.
Fan will run continuously on low fan speed set ti ng even if there
is no demand for cooling or heating. The continuous fan is
controlled by a dry contact to provide int erlocking to ERV or
room occupancy control. See Appendix for electrical
schematics.
6. ACOUSTIC RETURN AIR PANEL
1. Return Air (R.A.) Panel is painted standard “Appliance
White”. Carefully unpack R.A. Panels from shipping box.
R.A. panel s with optional key locks require key locks to
be field installed to t he sl ot in panel door. ADA R.A. door
panels come with an opening and pilot holes mounti ng a
Johnson Controls thermostat. ADA harness for wiring to
thermostat and connecting to unit is shipped loose with
the thermostats.
2. Locate drywall opening at a distance from the unit that
prevents the R.A. panel from contacting the unit sleeve.
See Figure 7 & 8. R.A. panel throat opening should be
centered to the unit cabinet return air flange opening.
3. Fasten R.A. Panel to frame opening using screws
provided. See Figure 7.
4. Refer to Figure 9A showing opening for mounting ADA
compliant thermostat at 48” above floor. Note that
location of opening on door changes i f cabinet is ordered
with stand. A left hand opening door is shown. R.A Panel
with ADA is not reversible and must be ordered in either
Left or Right hand opening configuration, determined by
location of door hinge.
ENVIRO-TEC 16
FORM ET145.18-IOM1 (115)
FIGURE 7 – Critical Return Air Panel with Unit Cabinet Installation Dimensions
ENVIRO-TEC 17
Note:
*Cut away view for standard cabinet with no
1) Dimensions shown do not include optional stand height.
FIGURE 8 –Return Air Panel Dimensions
FORM ET145.18-IOM1 (115)
stand. Add stand height to cabinet to obtain
correct dimension of R/A panel from floor.
Note:
1) See Figure 7 for additional R.A. panel and cabinet installation information.
FIGURE 9 – R.A Panel Cross Section Installation at Floor Level
ENVIRO-TEC 18
FORM ET145.18-IOM1 (115)
FIGURE 9A – Optional Return Air Panel with ADA Mounted Thermostat
ENVIRO-TEC 19
FORM ET145.18-IOM1 (115)
7. SUPPLY AIR DUCTWORK
Installer must ensure there is no direct contact
between cabinet sheet metal parts and drywall
enclosure. This includes return air and supply air
flanges. Failure to follow these instructions will
negatively affect unit sound performance.
A. Horizontal Supply Air
A 2” duct flange (field provided) may be required to eliminat e
supply air recirculation when shall ow profile, single deflection
supply grilles are installed at the cabinet discharge openings. If
the discharge from the cabinet is not ducted completely into
the conditioned space, air can recirculate into the return air
opening from the space inside the drywall enclosure.
JCI supplied grilles shall have a clearance of ¼” around the
perimeter in order to fit inside the unit supply flange. Other
grille manufacturers could have different clearances and
should be verified.
Field supplied gasket must be applied ac cordingly in order to
prevent air recirculation and vibration transfer when supply
grilles are mounted to unit supply opening. When mounting
supply grilles with opti onal volume damper directly to cabinet
supply flange, the volume damper will fit inside the cabinet
supply flange. It is recommended to apply 1/8” neoprene tape
around the perimeter the volume damper prior to inserting into
the supply opening. See Figure 11 for an example. This will
assist in reducing noise transmission and air recirculation into
unit closet
For ducted openings connect the unit supply opening to the
supply ductwork using a watertight flexible duct connector.
This will minimize the transmission of operating sounds
through the supply ductwork. Elbows with turning vanes or
splitters are recommended to minimize air noise due to
turbulence and to help reduce static pressure.
B. Top Discharge Supply Air
Units that are installed with a top discharge should be
connected to the supply ductwork with a watertight flexible
connector. This will minimize the transmission of operating
sounds through the supply ductwork. Elbows with turning
vanes or splitters are recommended to minimize air noise due
to turbulence and to help reduce static pressure.
For information on available unit horizontal and top supply
openings see Table 4 on the following page. Recommended
face velocity at the outlet supply grille is 300-500 FPM. Table
4 gives face velocity at the unit supply openings in relation t o
Table 3. To calculate the face velocity at the supply grille, take
the FPM from Table 4 and divide by the supply grille free area
factor.
FIGURE 10 – Supply Grille with Volume Damper and 1/8”
Neoprene Tape Applied To Perimeter
ENVIRO-TEC 20
FORM ET145.18-IOM1 (115)
FIGURE 11 – Unit Mounted Supply Grille Ins t allation Dimensions
ENVIRO-TEC 21
FORM ET145.18-IOM1 (115)
Model
Horizontal Openings
Single Horizontal
Double Horizontal
Triple Horizontal
No Top Opening
w/ Top Opening
No Top Opening
w/ Top Opening
No Top Opening
09
14W x 12H
14W x 6H
14W x 8H
Not Available
Not Available
12x8
12
14W x 14H
14W x 6H
14W x 10H
Not Available
Not Available
12x8
15
16W x 14H
14W x 6H
14W x 10H
Not Available
14W x 8H
14x12
18
Not Available
14W x 6H
14W x 12H
14W x 6H
14W x 10H
14x12
24
Not Available
14W x 10H
16W x 14H
14W x 6H
14W x 10H
14x12
30
Not Available
14W x 6H
20W x 14H
14W x 6H
16W x 12H
18x16
36
Not Available
14W x 10H
Not Available
14W x 6H
16W x 14H
18x16
Model
Horizontal Openings
Single Horizontal
Double Horizontal
Triple Horizontal
No Top Opening
w/ Top Opening
No Top Opening
w/ Top Opening
No Top Opening
09
291
272
219
Not Available
Not Available
510
12
316
344
221
Not Available
Not Available
645
15
354
314
283
Not Available
236
471
18
Not Available
391
294
294
235
587
24
Not Available
397
273
364
291
729
30
Not Available
416
276
339
269
538
36
Not Available
410
Not Available
385
261
610
TABLE 4 – Unit Supply Opening Sizes
UNIT SUPPLY OPENING SIZES
Top
Opening
1. Unit supplied supply grilles wil be supplied as double-deflection type.
2.Grilles for unequal airflow applications (i.e. unit-mounted plus ducted suppl y) shall be provided with integral opposed-blade dampers.
3. All grilles will be supplied in standard “Appliance White” painted finish.
4. Grilles are shipped loose, for field installation upon completion of cabinet/ductwork/drywall installation.
5. Top opening size does not change. When combined with any other discharge arrangement, shallbe be included in determining horizontal
opening grille size.
6. Openings marked ‘Not Available’ result in face velocities outside the recommended 300-500 FPM range.
7. Hi-Static Blower option is not recommended or single horizontal discharge openings with unit mounted supply grille.
UNIT SUPPLY FACE VELOCITY (FPM)
Top
Opening
1. Tabulated Face velocities do not account for supply grille free area factor. Face velocities at supply grille will be higher depending on grille type.
2.Face velocities are based on the nominal rated CFM and in feet per minute (FPM).
3. Face velocities are calculated by taking the averate across all openings. Tabulated top opening face velocity is only for units with single Top
Opening and no horizontal openings.
ENVIRO-TEC 22
8. TOP MOUNTED FRESH AIR SUPPLY OPENING
2A
2B
2C
1
A. Top Mounted Fresh Air
The optional fresh air intake provides a 4” round duct
connection on top of the unit (see Figure 12, for right and left
hand version). The fresh air is discharged upstream of the DX
coil through the discharge collector box.
Do not allow incoming air to bypass the DX coil,
otherwise damage to unit may occur.
Unit can be selected with the fresh air opening located on top
left or right hand side for ease of installation.
It is recommended that applications requiring 10% or more
outdoor air utilize a pressurized fresh air s ystem. Unit cabinet
static pressure at the return air opening is not designed to draw
10% or more in passive fresh air systems.
It is recommended that fresh air with a high humidity ratio is pretreated before entering unit assembly using energy recovery
ventilators or make-up air units. Fresh air duct inside unit is
insulated to protect unit f rom condensation in the event of high
humidity air however excessively moist fresh air over prolonged
periods can potentially result in condensate inside unit or closet.
FORM ET145.18-IOM1 (115)
STEP 2. a) Remove red cover from actuator body, b) if
black cover has become loose, position it in place, and c)
slide back onto actuator.
Recommend fresh air is pre-treated before entering
unit assembly by energy recovery ventilators (ERV)
or make-up air units to avoid condensate developing
inside ducts and equipment.
Unit c omes wi th 4-1/4” return air sleeve. Front supply openings
will come with 4-1/4” supply plaster flange.
B. Top Mounted Fresh Air with Motorized Damper
Same features as in the top mounted fres h air int ake option and
including a motorized damper assembly inside the discharge
collector box similar to depiction i n F i gure 12. Damper assembly
can be easily removed, for servi c ing see steps below. Motorized
damper assembly opens during FAN ON operation. See
Appendix for electrical schematic. For other control options
please contact the factory.
During transportation, handling or installation of the
cabinet, excessive handling can cause an inner black
plastic cover to come loose and jam the actuator
preventing the damper from opening.
During start-up check that the damper is opening when unit fan
is running. It can take 20 seconds to full y open. If dam per opens
unit is operating as intended.
If it fails to open t he cause is likely a loose cover preventing
actuator from rotating. To remove actuator and service the
damper refer to instructions below:
STEP 1. Looking up underneath top of the return air
flange you will notice the damper assembly. Remove
seven fasteners holding t he damper plate. Drop the plate
down, disconnect the quick-connect terminals from the
harness.
STEP 3. Secure red cover back over actuator assembly.
Ensure the plastic tabs are secured to the metal body
bracket. Connect quick-connect terminals and insert
damper assembly into discharge collector box. Fasten
using screws.
ENVIRO-TEC 23
FIGURE 12 – Fresh Air Opening – Left Hand and Right Hand Unit Shown
Cabinet Dimensions
Model
A B C
09-12
17 8 12
15-24
20
12
14
30-36
24
16
18
1. Optional Fresh Air option comes with 4-1/4” R.A flange.
2. Optional front supply opening comes with 4-1/4” duct flange.
3. All other openings come with standard 1” duct flange.
4. Left and Right hand versions shown.
FORM ET145.18-IOM1 (115)
ENVIRO-TEC 24
9. CHASSIS INSTALLATION
Prior to installation of the refrigeratio n chassis, and
connection to the supply and return risers, the entire
water loop system must be flushed and cleaned. See
Section 14.
DO NOT APPLY SEALING TAPE OR PIPE DOPE ON
NPSH STYLE FITTINGS!
Check that fem ale end gasket from the hose is not
missing, has no visible damage and free of debris.
ALWAYS USE A BACK-UP WRENCH WHEN
INSTALLTING HOSES!
Protect chassis from physical damage, drywall dust,
paint fumes and construction contamination during.
FORM ET145.18-IOM1 (115)
B. Units with NPT-Style (Tapered Pipe Thread) Valve
Connection and Hoses:
Factory supplied NPT flexible connection hoses come with
thread sealing compound pre-applied. NO ADDITIONAL
THREAD SEALING TAPE SHOULD BE REQUIRED. Connect
the hoses to the FPT fitting on the shut-off val ves. Always use a
back-up wrench when tightening the hose to the valve fitting.
Allow the hoses to hang free inside the cabinet.
Slide chassis into place, see following page. J-swivel adapter
(supplied with the hose kit), comes with thread sealing
compound pre-applied. NO ADDITIONAL THREAD SEALANT
SHOULD BE REQUIRED. Thread the swivel adapters into the
FPT fittings projecting through the top of the compressor
compartment access cover. Always use a back-up wrench to
prevent twisting of the copper water piping within the chassis
assembly.
To minimize the possibility of damag e to the chassis
or cabinet, for maximum ease of installation, the use of
a two-wheeled dolly is strongly recommended.
Do not contact the finned coil face. Damage to the fins
will result.
1. Lift chassis from the front of chassis as shown.
Remove the inner service panel from the cabinet, and i nspect
the interior compartment for debris.
Locate the supply and return shut-off valves , and verify that the
valves are closed. Check to see what type of hos e kit fittings
were provided with the unit. Unit shipped after June 2013
feature NPSH fittings (straight thread), while previous
generation hose kits are NPT type (tapered thread). Refer to
previous section 6B for more information.
HOSES MUST BE HAND TIGHTENTED THEN
FURTHER TIGHTENED NO MORE THAN 1/4 TURN.
DO NOT APPLY EXCESSIVE FORCE!
ALWAYS USE A BACK-UP WRENCH WHEN
TIGHTENING HOSES TO VALVES! OTHERWISE
VALVE SOLDER JOINT MAY FAIL LEADING TO
PROPERTY DAMAGE OR SERIOUS INJURY!
A. Units with NPSH Valve Connection and Hose Sets:
NPSH Flexible connection hoses do not require any pipe dope
or sealant tape. DO NOT ADD THREAD SEALANT OR PIPE
DOPE TO NPSH FITTINGS. Connect the hos es to the NPSH
fitting on the shut-off valves. Always use a back-up wrench
when tightening the hose to the valve f itt ing. Allow the hoses t o
hang free inside the cabinet.
Once chassis is slid into place attach the NPSH hoses to the
NPSH fittings on the chassis stub outs projecting through the
top of the compressor compartment acc ess c over. A l ways us e a
back-up wrench to prevent twisting of the copper water piping
within the chassis assembly. Refer to the following page for
proper chassis installation.
2. Align chassis with the opening of the cabinet. Tilt back
sufficiently for the base of the chassis to clear the
mounting rails on the cabinet drain pan.
ENVIRO-TEC 25
3. Insert chassis midway into the opening of the cabinet.
Lower the rear of the chassis until the base of t he chassis
contacts the formed mounting rails in the cabinet drain
pan.
4. Pivot the chassis base on the front edge of the drain pan
rails. Before fully i nsert i ng chassis – Ensure wiring harness
and or water hoses will not be pinched between chassis
and cabinet.
FORM ET145.18-IOM1 (115)
Before fully inserting chassis, ensure wiring harness
and or water hoses will not be pinched.
Do not apply excessive force when sliding chassis
into cabinet!.
To avoid damage from clogged coil surfaces,
plugged motor ventilation openings, and potential
unit failure, DO NOT operate unit without compete
enclosure, supply grille, return air panel and filter in
place
6. Connect hoses t o the chassis. Ensure that the hoses will
not be pinched once the chassis is slid into place.
7. Check alignment of the chassis in the cabinet. The
chassis should be centered in the cabinet opening –
without touching the flanges on the sides of the cabinet
opening.
5. Slide the chassis into the cabinet until at least ¾ of the
depth of the chassis is supported. The chassis should slide
easily on the drain pan rails. Do not apply excessive
force! Ens ure that the chassis will not tip forward before
removing dolly.
8. Complete the electrical connections to the chassis by
means of the two quick connect mating plugs. The unitmounted plug ends are located on the bottom of the control
box.
9. Remove the shipping cover from the face of the air-torefrigerant coil. Install the inner service panel. Check that
the foam gasket seal between the panel and the chassis is
slightly compressed. If necessary, pull the c hassis forward
slightly to ensure an adequate seal between the chassis
and the service panel.
10. Install the air filter ont o the face of the service panel. Slide
the filter upward into the top-retai ning clip, unti l the bottom
of the filter can be dropped onto the lower clip.
11. Install service panel. If not done already, i nstall the Return
Air panel into the drywall opening. Refer to Section 6.
Secure the panel into the drywall with six screws.
ENVIRO-TEC 26
FORM ET145.18-IOM1 (115)
10. UNIT START-UP
A. Pre-Start-up Checklist
When the installation is complete and the s ystem is cleaned
and flushed, open the supply and return shut-off valves at
each unit, refill the system and bleed off all air.
Before energizing the unit, the following system devices must
be checked:
□ Is the high voltage power supply correct and in
accordance with the nameplate ratings?
□ Is the field wiring and circuit protection the correct size?
□ Is the unit electrically grounded?
□ Is the low voltage control wiring correct per the unit
wiring diagram?
□ Is vibration isolation provided? (unit isolation pad,
flexible hoses, etc.)
□ Are the low / high-side pressure temperature caps
secure and in place?
□ Are all the unit access panels secure and in place?
□ Is the thermostat in the OFF position?
□ Is the water flow established and circ ulating through all
the units?
□ Is the ductwork (if required) correctly sized, run, taped,
and insulated?
□ Does the indoor blower turn freely without rubbing?
□ If applicable has glycol fluid been added in the proper
mix to prevent freezing in closed system application?
□ Are clean, properly sized air filters in place?
□ Is the condensate drain pipe firmly sec ured to both drain
riser and drain pan stub?
B. Initial Unit Start-up
1. Close disconnect switches on all units to provide line
power.
During installation, testing, servicing, and
troubleshooting of this product, it may be
necessary to work with live electrical componen ts.
Failure to follow all electrical safety precautions
when exposed to live electrical components could
result in serious injury or death.
2. Set the thermostat to the highest temperature setting.
3. Set the thermostat system switch to COOL; the fan
control switch to AUTO. The compressor should NOT
run.
4. Reduce the temperature control setting until the
compressor and supply fan are energized. Water
temperature leaving the heat exchanger should be
warmer than the entering water temperature (approx. 9-
o
12
F). Blower operation should be smooth. Compres sor
and blower amps should be within t he nameplate data
values. The suction line should be cool, with no frost
observed in the refrigerant circuit.
5. Turn the thermostat switch to the OFF position. The
compressor and fan should stop running, and the
reversing valve should de-energize.
6. Leave the unit off for approxim ately 5 minutes to allow
for pressure equalization.
7. Turn the thermostat to the lowest setting.
8. Set the thermostat system switch to t he HEAT position.
The compressor should NOT run.
9. Adjust the temperature setting upward until the
compressor and supply fan are energized. Af ter several
minutes, warm air should be detected at the supply
register. A water temperature decrease of approximately
o
5-9
F across the heat exchanger s hould be noted. The
blower and compressor operation should be smooth,
with no frost observed in the refrigerant circuit.
10. Set the thermostat to maintain the desired space
temperature.
11. Check all water connections for any leaks, including
condensate drain hose connections.
C. System Loop Temperature
Loop temperatures affect unit performance, power
consumption (efficiency), maintenance and reliability, and
noise levels. High entering water temperatures (EWT) in
cooling mode above rated conditions of 86
increase power consumption and increase compressor noise
levels. Sustained operation above 100
maintenance costs and increased compressor noise may
affect occupancy comfort. Unit is designed to operate up to
o
110
F EWT for intermittent periods when system loop
temperatures become elevated under high load condit ions. It
is not recommended to set system loop temperatures at
o
110
F in case of high load conditions cause supply loop
temperatures to exceed 110
may be negatively impacted at high EWT.
When in heating season maximum operating loop
temperature is 90
system loop temperatures at or above rated conditions of
o
68
F EWT for optimal unit performance. If system loop
temperatures are low where freezing the coaxial is possible,
system loop must contain a glycol fluid mixture that is
adequate to prevent freezing. Minimum loop temperature
with glycol mixture is 20
will result in lower efficiency and heating capacity.
High system loop temperatures may negatively
affect unit performance, efficiency, maintenance
and reliability, and noise levels.
Operating Limits
o
F EWT. It is recommended to maintain
o
F EWT. Unit sound performance
o
F EWT. Lower loop temperatures
o
o
F EWT will
F EWT may increase
COOLING HEATING
MIN. ENTERING WATER
MAX. ENTERING WATER
o
30
F 20oF
o
F 90oF
110
ENVIRO-TEC 27
FORM ET145.18-IOM1 (115)
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
HIGH 340 330 320 310 300 285 270 255 240 225 LOW 255 250 240 230 220 210 - - - - HIGH 445 435 425 415 400 385 370 355 340 320 295
LOW 350 345 335 325 315 305 290 - - - HIGH 580 570 560 550 535 520 505 485 465 445 425
LOW 385 380 375 370 365 355 345 335 - - HIGH 700 690 675 660 635 615 595 575 550 525 495
LOW 450 445 440 435 430 425 - - - - HIGH 880 855 835 815 795 770 740 710 680 650 615
LOW 715 710 705 690 670 650 630 605 580 - HIGH 1115 1100 1075 1050 1020 990 960 930 895 850 800
LOW 965 960 950 935 915 895 870 840 810 780 745
HIGH 1230 1200 1170 1140 1110 1075 1040 1000 960 915 870
LOW 1115 1100 1075 1050 1020 990 960 930 895 855 805
30
1075
700
36
1220
840
24
850
575
15
550
09
340
220
12
430
290
335
Ext ernal Stat ic Pressure (in w.g.)
Unit
Size
Motor
Speed
Rated
CFM
Min.
CFM
18
685
430
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8
HIGH 375 370 360 350 340 330 315 300 285 265 245 220 - - - - LOW 330 320 310 300 290 280 270 255 240 225 - - - - - - HIGH 485 475 465 455 440 425 410 395 380 360 340 315 - - - - LOW 390 385 380 370 360 350 335 320 305 - - - - - - - HIGH 665 650 635 615 595 575 555 540 520 500 475 450 420 395 370 340 LOW 580 570 560 550 535 520 505 485 465 445 425 400 375 350 - - HIGH 750 735 715 695 675 655 630 605 580 555 525 495 465 435 - - LOW 670 655 640 625 605 585 560 535 510 485 460 435 - - - - HIGH 990 970 950 930 910 890 865 845 820 795 770 740 710 680 650 615 575
LOW 795 785 775 760 745 730 715 695 675 655 630 605 580 - - - HIGH 1180 1170 1160 1145 1130 1110 1090 1070 1050 1025 1000 970 940 910 875 840 800
LOW 985 980 975 970 960 950 940 935 920 905 895 875 850 825 795 765 730
HIGH 1340 1320 1295 1270 1245 1220 1190 1160 1130 1100 1070 1040 1010 980 945 910 870
LOW 1180 1170 1160 1145 1130 1110 1090 1070 1050 1025 1000 970 940 910 875 840 800
09
340
220
12
430
290
15
550
335
30
1075
700
36
1220
840
18
685
430
24
850
575
Rated
CFM
Min.
CFM
Ext ernal Stat ic Pressure (in w.g.)
Unit
Size
Motor
Speed
11. FAN SPEED ADJUSTMENT
Multi-speed direct drive motors are used in all units as
standard. Although the PSC fan motors have a minimum of
three selectable speeds, and EC motors have five speeds,
only two speeds are recommended and selected for use.
Optional ECM increases operating efficiency by consuming
fewer watts than standard PSC motors. Motors are factory
programmed and cannot be re-programmed i n the field. Each
motor contains 5 low voltage speed taps – t wo speed taps are
used as standard.
Blower speed taps are factory set for optimum heating and
cooling airflow ranges. Refer to Table 5 for factory blower
speed settings, and minimum operating airflow.
Operating unit below the minimum airflow may
result poor heating / cooling performance and
periodic unit lockout.
TABLE 5 – Fan Tables
PSC Standard Blower Performance (CFM)
Located on the electrical box cover, a unit mounted 2-speed
fan switch allows fan speed switching from LOW and HIGH fan
speeds to meet site conditions such as increased ductwork
static pressure, or the use of higher efficient filters.
Installed system must be test run to ensure operation with
sufficient heating and cooling airflow. Excessive ductwork
static pressure will result in an improper volume of airflow.
High airflow volumes will result in elevated noise levels and
may affect occupancy comfort.
LOCK ALL ELECTRICAL POWER SUPPLY
SWITCHES IN THE OFF POSITION BEFORE
SERVICING THE UNIT. FAILURE TO DISCONNECT
POWER SUPPLY MAY RESULT IN ELECTRICAL
SHOCK OR EVEN DEATH.
PSC High Static Blower Performance (CFM)
ENVIRO-TEC 28
ECM Standard Blower Performance (CFM)
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
HIGH 2 342 317 292 276 259 247 236 228 220 214 207
LOW 1 278 252 226 212 198 189 180 - - - HIGH 4 463 431 399 378 356 340 324 317 310 299 289
LOW 2 342 317 292 276 259 247 236 - - - HIGH 2 600 567 534 500 466 445 424 396 367 340 312
LOW 1 495 447 399 372 346 307 268 - - - HIGH 4 760 726 693 667 642 615 587 574 561 529 497
LOW 2 600 567 534 500 466 445 424 396 - - HIGH 4 891 863 835 809 784 757 730 689 648 601 554
LOW 2 760 726 693 667 642 615 587 574 - - HIGH 3 1131 1105 1079 1058 1037 1016 994 972 949 934 918
LOW 1 918 894 870 852 835 808 781 762 743 718 HIGH 4 1265 1235 1206 1184 1163 1141 1118 1085 1051 1008 965
LOW 2 1065 1037 1009 987 965 949 934 910 886 874 861
36
1220
861
24
850
574
30
1075
718
15
550
268
18
685
396
Ext ernal Stat ic Pressure (in w.g.)
09
340
180
12
430
236
Unit
Size
Motor
Speed
Rated
CFM
Min.
CFM
ECM
TAP#
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75
HIGH 3 411 382 354 334 315 300 286 279 272 263 254 242 231 220 - LOW 2 342 317 292 276 259 247 236 228 220 - - - - - - -
HIGH 5 554 529 504 477 451 430 408 393 378 360 341 330 319 300 - -
LOW 4 463 431 399 378 356 340 324 317 310 299 290 - - - - -
HIGH 3 659 623 587 564 541 511 482 462 441 419 397 372 346 320 - -
LOW 2 600 567 534 500 466 445 424 396 367 340 312 - - - - -
HIGH 5 891 863 835 809 784 757 730 689 648 601 554 518 482 446 408 -
LOW 4 760 726 693 667 642 615 587 574 561 529 497 469 441 412 - -
HIGH 5 1002 971 940 912 883 854 826 800 774 749 724 698 671 643 615 586
LOW 3 866 827 789 762 735 708 682 659 636 612 587 571 - - - -
HIGH 4 1265 1235 1206 1184 1163 1141 1118 1085 1051 1008 965 913 861 808 756 701
LOW 2 1065 1037 1009 987 965 949 934 910 886 874 861 839 818 - - -
HIGH 5 1462 1418 1375 1331 1287 1241 1194 1153 1112 1053 994 964 934 903 872 840
LOW 4 1265 1235 1206 1184 1163 1141 1118 1085 1051 1008 965 913 861 - - -
36
1220
840
24
850
571
30
1075
701
15
550
312
18
685
408
E xt ernal Stat ic Pressure (i n w.g. )
09
340
220
12
430
290
Unit
Size
Motor
Speed
Rated
CFM
Min.
CFM
ECM
TAP#
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75
1 278 252 226 212 198 189 180 - - - - - - - - 2 342 317 292 276 259 247 236 228 220 214 207 - - - - 3 411 382 354 334 315 300 286 279 272 263 254 242 231 220 - 4 463 431 399 378 356 340 324 317 310 299 290 - - - - 5 554 529 504 477 451 430 408 393 378 360 341 330 319 300 - 1 278 252 226 212 198 189 180 - - - - - - - - 2 342 317 292 276 259 247 236 - - - - - - - - 3 411 382 354 334 315 300 286 279 272 263 254 242 231 220 - 4 463 431 399 378 356 340 324 317 310 299 289 - - - - 5 554 529 504 477 451 430 408 393 378 360 341 330 319 300 - 1 495 447 399 372 346 307 268 - - - - - - - - 2 600 567 534 500 466 445 424 396 367 340 312 - - - - 3 659 623 587 564 541 511 482 462 441 419 397 372 346 320 - 4 760 726 693 667 642 615 587 574 561 529 497 469 441 412 - 5 891 863 835 809 784 757 730 689 648 601 554 518 482 446 408 1 495 447 399 372 346 307 268 - - - - - - - - 2 600 567 534 500 466 445 424 396 367 340 312 - - - - 3 659 623 587 564 541 511 482 462 441 419 397 372 346 320 - 4 760 726 693 667 642 615 587 574 561 529 497 469 441 412 - 5 891 863 835 809 784 757 730 689 648 601 554 518 482 446 408 1 659 623 587 564 541 511 482 462 441 419 397 372 346 320 - 2 760 726 693 667 642 615 587 574 - - - - - - - -
3 866 827 789 762 735 708 682 659 636
612 587 571 - - - 4 891 863 835 809 784 757 730 689 648 601 554 - - - - 5 1002 971 940 912 883 854 826 800 774 749 724 698 671 643 615 586
1 918 894 870 852 835 808 781 762 743 718 - - - - - 2 1065 1037 1009 987 965 949 934 910 886 874 861 - - - - 3 1131 1105 1079 1058 1037 1016 994 972 949 934 918 - - - - 4 1265 1235 1206 1184 1163 1141 1118 1085 1051 1008 965 913 861 808 756 701
5 1462 1418 1375 1331 1287 1241 1194 1153 1112 1053 994 964 934 903 872 840
1 918 894 870 852 835 808 781 762 743 718 - - - - - 2 1065 1037 1009 987 965 949 934 910 886 874 861 - - - - 3 1131 1105 1079 1058 1037 1016 994 972 949 934 918 - - - - 4 1265 1235 1206 1184 1163 1141 1118 1085 1051 1008 965 913 861 808 756 701
5 1462 1418 1375 1331 1287 1241 1194 1153 1112 1053 994 964 934 903 872 840
Unit Si ze
ECM TAP#
Rated
CFM
Min.
CFM
30
36
1220
550
268
09
12
15
18
24
180
Ext ernal Stati c P ressure (in w.g.)
861
1075
718
850
574
685
396
430
236
340
ECM High Static Blower Performance (CFM)
FORM ET145.18-IOM1 (115)
ECM Blower Performance – All Speed Taps (CFM)
Note: All airflow ratings are at lowest voltage rating of dual rating (i.e. 208 volt).
Airflow ratings include resistance of wet coil and clean air filters.
ENVIRO-TEC 29
FORM ET145.18-IOM1 (115)
12. MAINTENANCE
Maintenance on the unit is simplified with the following
preventive suggestions:
1. Visually inspect unit at least once a month. Special
attention should be paid to hose assemblies. Note any
signs of hose deterioration or cracking; attend to any
indication of minor leakage immediately.
2. Filter maintenance must be perform ed to ensure proper
operation of the equipment. Inspect filters at least every
three months, and replace when visible dirt build-up is
evident.
To avoid fouled machinery and extensive unit clean
up, DO NOT operate units without filters in place, or
use the unit as a temporary cooling/heating source
during construction.
3. Inspect condensate drain pan for algae growth and
mineral build-up every three months. Excessive algae or
mineral deposits in the drain pan or drain line can result in
condensate overflow and unpleasant mildew odors.
4. Check fan motor and blower assembly annually. All units
employ permanently lubricated fan motors. DO NOT OIL
FAN MOTORS. Vacuum any accumulation of dirt from
motor ventilation slots and the blower wheel.
5. Check the contactors and relays within the control panel
annually. Inspect for any visible signs of overheated
contacts or temperature damage to wiring. Check
terminals for tightness.
6. Conduct an amperage check annually on the compressor
and fan motor. Higher amperage draw than nameplate
values (more than 10%) may indicate heat exchanger
fouling, low water flow, or premature physical motor
failure.
7. Inspect air-to-refrigerant heat exchanger surface at least
once a year. A dirty or partially clogged coil can
significantly reduce operating capacity, and can result in
serious equipment problems. If the coils appear dirty,
clean them using mild detergent or a commercial coilcleaning agent.
8. Inspect hoses, valves and connections for water leaks.
For hose connection leaks inspect rubber hose gaskets
and replace as required.
Safety Control Reset
All VSCS heat pumps are furnished with a high-pressure
protection switch, a low-pressure control switch, low water
temperature protection switch and condensate overf low switch
to prevent compressor operation during abnormal conditions.
If either of these safety devices is activated a lockout relay
circuit is engaged, which interrupts heating and cooling
operation, even though the control contacts may have
automatically re-closed.
This microprocessor driven lockout circuit m ust be manually
reset. Reset is accomplished by m oving the thermostat c ontrol
(system) switch to the OFF position momentaril y, then back to
the HEAT, or COOL (or AUTO) position.
The lockout circuit may also be reset by opening and closing
the unit mounted disconnect switch.
If the unit must be reset more than twice on
consecutive operating cycles, check the unit for a
dirty filter, abnormal entering water temperature,
inadequate or excessive water flow, or refrigerant
circuit malfunction. If the unit continues to cutout,
contact a trained service technician.
13. UNIT CONTROLS
The control system microprocessor board is specifically
designed for water source heat pump operation. The control
system interfaces with a conventional type thermostat.
A. Unit shall be complete with self-contained low-voltage
control circuit
B. Unit shall incorporate a lockout circuit which provides
reset capability from a hard lock-out at the space
thermostat or base unit, should any of the following
standard safety devices trip and shut off compressor.
a. Loss-of-charge/Low-pressure switch
b. High-pressure switch
c. Freeze-protection thermost at, unit shutdown on low
water temperature.
d. Condensate Overflow protection switch
C. Unit shall operate with conventional thermostat designs
and have a low voltage terminal strip for easy hook-up.
D. Unit control board shall have on-board diagnostics and
fault code display.
E. Standard controls shall include anti-short cycle and low
voltage protection
F. Control board shall monitor eac h refrigerant safety switch
independently.
G. Control board shall have random start feature
H. Control board shall retain last 5 fault codes in non volatile
memory which will not be lost in the event of a power
loss.
Sequence of Operation
The room t-stat makes a circuit between “R” & “Y1” for cooling.
The call is passed to the unit micro process or control, which
then determines whether the requested operat ion is available
and, if so, which components to energize.
For the heating, the room t-stat makes a circuit between “R” &
“W1”. The micro processor control energizes the com pressor
and fan allowing the unit to run in heating mode.
If at any time a call for both heating and cooling are present,
the heating operation will be performed. If operating, the
cooling system is halted as with a completion of a call for
cooling. Heating always takes priority.
Continuous Blower
With the room t-stat fan switch set t o “AUTO” and the system
switch set to either the “AUTO” or “HEAT ” settings, the blower
is energized whenever a cooling or heating operation is
requested. The blower is energized after any specified delay
associated with the operation.
When energized, the indoor blower has a minimum run time of
30 seconds. Additionally, the indoor blower has a delay of 10
seconds between operations.
When the room t-stat calls for cooling, the low-voltage control
circuit from “R” to “Y1”and “G” is completed. The compress or
and fan motor are energized. After completing the specified
fan on delay for cooling, the micro processor control will
energize the blower motor.
ENVIRO-TEC 30
FORM ET145.18-IOM1 (115)
Once the room t-stat has been satisfied, it will deenergize”Y1”. If the compressor has satisfied its minimum run
time, the compressor and fan de-energize. Otherwise, the unit
operates the cooling system until the mi nimum run tim e for the
compressor has been completed. After the compressor deenergizes, the blower is stopped following the elapse of t he fan
off delay for cooling.
To be available, a compressor must not be locked-out due to a
high pressure switch; low pressure switch; condensate
overflow switch; freeze-stat trip and the anti-short cycle delay
(ASCD) must have elapsed.
Operation Errors
Each refrigerant system is monitored for operation outside of
the intended parameters. Errors are handled as described
below. All system errors override minimum run times for
compressors.
High-Pressure Limit Switch
If a high pressure limit switch opens. The micro processor
control de-energizes the compressor, initiates the A SCD (Anti short cycle delay), and stops the unit fans ( soft lock-out).If a
call for cooling or heating is still present at the c onclusion of
the ASCD, the micro processor control will re-energize the
compressor and unit fan.
Should a high pressure switch open three times within two
hours of operation, the micro processor control will
permanently lock –out the system compressor, requiring a
manual reset of the system (enter a hard lock-out), by deenergizing the 24 volt power to unit, or turning the room t -stat
to the “OFF” position then back to either heating or cooling as
required. The micro processor control will flash a fault code
indicating the high pressure lock-out. (See attached table).
Low Pressure Limit Switch
The low pressure limit switch i s not monitored during t he initial
30 seconds of compressor operation. For the following 30
seconds, the microprocessor control will monitor the low
pressure switch to ensure it closes. If the If the l ow pressure
switch fails to close after the 30 second m onitoring phase, the
micro processor control will de-energize the compressor,
initiate the ASCD, and stop the fan (soft lock-out).
Once the low–pressure switch has been proven (closed during
the 30 second monitor period described above), the
microprocessor control will monitor the low pressure switc h fo r
any openings. If the low–pressure switch opens for greater
than 5 seconds, the micro processor control will de-energize
the compressor, initiate the ASCD, and st op the compressor
(soft lock-out).
If the call for cooling is still present at the conclusion of the
ASCD, the micro processor control will re-energize the
compressor.
Should a low pressure switch open three times within one hour
of operation, the microprocessor control board will lock-out the
compressor (enter into a hard lock-out) and fl ash a fault code
(see attached table).
Freeze-stat
If a freeze-stat opens, the micro processor control will deenergize the compressor, and initiate the ASCD. If a call for
cooling or heating is still present at the conclusion of the
ASCD, the micro processor control will re-energize the halted
compressor.
Condensate Overflow Switch
A Condensate Overflow fault occurs if the Condensate
Overflow switch opens continuously for 30 seconds. The
compressor is shutdown regardless of Minimum Run Time and
alarm 15 is set. Fan continues operating in its current state.
The control logs the first incident per compressor request.
Lockout occurs on the second fault occurrence within a
request cycle, requiring reset or power cycling. If the
compressor request is removed, the fault occurrence counter
is reset to zero. When lockouts are removed, the alarm is
reset.
Safety Controls
The micro processor control monitors the following inputs:
1. A suction line freeze-stat to protect against low leaving
water temperatures (opens at 34F and resets at 48F.)
2. A high pressure switch to protect against excessive
discharge pressures (opens at 600 psig +/– 25 psig).
3. A low pressure switch to protect against loss of refrigerant
charge (opens at 55psig +/– 5 psig).
4. A Condensate Overflow Switch to protect against
condensate overflow
Coaxial Freeze Protection Set Point
The unit allows for field selection of the coaxial freeze
protection set point. Unit utilizes a suction line freeze-stat
factory set for compressor lock-out when leaving water
temperature drops below 35F (resets at 48F ). To lower the set
point for low temp heating applications with an adequate
water-antifreeze solution, unplug freeze-stat sensor, located at
P6 on the microprocessor control board and plug in the (pink)
jumper attached to existing harness. By installing the jumper,
the freeze-stat is bypassed allowing for heating operati on with
leaving water temperatures below 35F. Use jumper only in low
water applications with adequate antifreeze protection,
otherwise damage can occur.
Random Start
Random start function, upon power up, will im pose time delay
of 4 minutes plus a random delay of 1 to 64 seconds. The
random number generator seed is determined by a fixed seed
programmed at the factory combined with the serial number,
model number, and the hours of compressor run time of the
unit.
Compressor Protection
In addition to the external press ure switches, the compressor
also has inherent (internal) protection. If t here is an abnormal
temperature rise in a compressor, the protector will open to
shut down the compressor. The micro processor control
incorporates features to minimize compressor wear and
damage. An anti-short cycle delay (ASCD) is utilized to
prevent operation of a compress or too soon after its previous
run. Additionally, a minimum run time is imposed any time a
compressor is energized. The ASCD is initiated on unit startup and on any compressor reset or lockout.
Microprocessor Control Unit Flash Codes
Various flash codes are utilized by the microproc essor control
to aid in troubleshooting. Flash codes are dis tinguished by the
short on and off cycle used (approximately 200ms on and
200ms off). To show normal operation, the control boards flash
a 1 second on, 1 second off “heart beat” during normal
operation. This is to verify that the micro processor is
functioning correctly. Do not confuse this with an error flash
code. To prevent confusion, a 1-flash, fault code is not used.
See Table 6 for list of all flash codes.
ENVIRO-TEC 31
FORM ET145.18-IOM1 (115)
Flash Codes
Description
Current alarms or active restrictions are flashed on the
microprocessor control LED.
1. Last Error – When this button is pressed and released
one time within five seconds, it flashes the last five fault
codes on the board’s LED. The most recent alarm is
shown first and the oldest alarm is shown last.
2. Test Reset – When thi s button is pressed and released
one time with five seconds, any anti-anti-short cycle delay
(ASCD) is bypassed for one cycle.
3. Comm Set UP – If the board is to be networked with other
units, this button is used to set the network address.
The first time the button is pressed within five sec onds, it
scans the bus, and then assigns itself the first available
address, (starts at 2).It then flashes that address one
time.
Pressing the button two times within five seconds causes
the control to flash the address.
Communication
The communication protocol is MODBUS using the RTU
method of packet framing at 19200-baud rate.
TABLE 6 – Flash Codes
On Steady Control Failure – Replace Control
Heart Beat Normal Operation
2 Flashes Control Waiting on ASCD1 (Anti-Short Cycle Delay)
3 Flashes HPS1 – Compressor Lock out
5 Flashes LPS1 – Compressor Lock out
13 Flashes Compressor Held OFF due to Low Voltage1
14 Flashes EEPROM Storage Failure (Control Failure)
15 Flashes Condensate Overflow Switch – Compressor Lock out
16 Flashes Coaxial Freeze Therm os tat – Compressor Lock out
1. These flash codes do not represent alarms.
ENVIRO-TEC 32
14. SYSTEM FLUSHING AND CLEANING
After the piping system is complete, and prior to c onnection of
the refrigeration chassis, the risers should be flushed and
cleaned to ensure proper start-up and continued efficient
operation of the system.
1. Ensure that the supply and return riser shut-off valves are
closed at each unit.
2. Using flexible hoses or piping, connect the supply and
return stub-outs in the unit l ocated at the end of the riser
run(s). If the building has more than 10 floors, connect the
supply and return stub-outs in the last two units to divide
the water flow and reduce pressure drop at the pump.
(See Figure below)
3. Open the shut-off valves in the units that have had the
supply and return risers inter-connected.
4. The water circulation system should be fi lled with clean
water using the make-up water supply. The air vents
should be open during initial filling (Do not allow the
system to overflow).
5. With the air vents closed, start the circulating pump and
then crack each air vent to ensure t hat all air is bled from
the system. (Make-up water must be available in
sufficient volume to replace the volume occupied by the
air that is bled off.)
6. When all air is vented, and the wat er is circulating under
pressure, the entire system should be checked for leaks.
Make any repairs as required.
7. Set the loop temperature controls to raise the
temperature to approximately 85
check for any leaks that may have occ urred due to the
increased heat. Repair as required.
8. Open the drain at the lowest point in the system (make-up
water flow rate must be equal to rate of drain bleed).
Continue to bleed system until water l eaving the drain is
clear, but not less than 2 hours.
9. Completely drain the piping system.
o
F. Perform a visual
FORM ET145.18-IOM1 (115)
After the initial Flushing, the system should be chemically
cleaned. The procedure for re-filling the system, and
circulating the cleaning solution, is the repeat of the above
flushing method.
The services of a professional water treatment company are
recommended with regards to the type of solution to be used,
and the duration of the cleaning application.
Once the cleaning process is complete, shut off the circ ulating
pump and completely drain the system. Refill the system with
clean water in preparation for connection of the refrigeration
chassis, and system start-up.
It is strongly recommended a professional water
treatment company is used to perform on-going
maintenance of water loop including chemical
analysis, and if necessary flushing. The water l oop
testing should be performed at intervals
recommended by the professional water treatment
consultant. It is up to the customer to carry out
adequate water loop maintenance over the lifespan
of the units otherwise damage to the units may
occur.
ENVIRO-TEC 33
APPENDIX:
PSC MOTOR WIRING DIAGRAM
FORM ET145.18-IOM1 (115)
ENVIRO-TEC 34
ECM WIRING DIAGRAM
FORM ET145.18-IOM1 (115)
ENVIRO-TEC 35
CONTINUOUS FAN WITH ECM WIRING DIAGRAM
FORM ET145.18-IOM1 (115)
ENVIRO-TEC 36
MOTORIZED DAMPER ECM WIRING DIAGRAM
FORM ET145.18-IOM1 (115)
ENVIRO-TEC 37
Refer to Installation Instructions for specific installation requirements.
• R-410A Refrigerant operates at 50 - 70 percent higher pressures than R-22. Be sure that servicing
equipment and replacement components are designed to operate with R-410A.
• R-410A Refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be 400 psig. DOT 4BA400 or DOT BW400.
• Recovery equipment must be rated for R-410A.
• Do not use R-410A service equipment on R-22 systems. All hoses, gages, recovery cylinders,
charging cylinders and recovery equipment must be dedicated for use on R-410A systems only.
• Manifold sets must be at least 700 psig high side, and 180 psig low side, with 550 psig retard.
• All hoses must have a service pressure rating of 800 psig.
• Leak detectors, must be designed to detect HFC refrigerants.
• Systems must be charged with refrigerant. Use a commercial type metering device in the manifold
hose.
• R-410A can only be used with POE type oils.
• POE type oils rapidly absorb moisture from the atmosphere.
• Vacuum pumps will not remove moisture from POE type oils.
• Do not use liquid line driers with a rated working pressure rating less than 600 psig.
• Do not install suction line driers in the liquid line.
• A liquid line drier is required on every unit.
• Do not use an R-22 TXV. If a TXV is to be used, it must be an R-410A TXV.
• Never open system to atmosphere when under vacuum.
• If system must be opened for service, evacuate system then break the vacuum with dry nitrogen and
replace filter driers.
FORM ET145.18-IOM1 (115)
R-410A QUICK RE FE RE N CE GUI DE
ENVIRO-TEC 38
NOTES
FORM ET145.18-IOM1 (115)
ENVIRO-TEC 39
P.O. Box 1592, York, Pennsylvania USA 17405-1592 Subject to change without notice. Printed in USA
Copyright © 2015 ALL RIGHTS RESERVED
Form ET145-18-IOM1 (115)
Issue Date: January 21, 2015
Supersedes: ET145-18-IOM1 (513)
800-861-1001
www.enviro-tec.com
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