Ruskin ENERVENT+ EVT-09 Series Installation manual
1
REVT-05ERV
APRIL 30 , 2020
SUPERSEDES: 01-23-20
ENERVENT+© SERIES: EVT-09 EVT-19, EVT-28, EVT-36, EVT-46,
EVT-62, EVT-74, EVT-88, EVT-10, EVT-12
ENERGY RECOVERY VENTILATOR WITH OPTIONAL TEMPERING
INSTALLATION, START-UP AND
MAINTENANCE INSTRUCTIONS
Energy recovery COMPONENT certied to the
AHRI Air-to-Air Energy Recovery Ventilation
Equipment Certication Program in accordance
with AHRI Standard 1060-2000. Actual
performance in packaged equipment may vary.
ETL Certied per UL 1995
and CSA 22.2
TABLE OF CONTENTS
I. MODEL NUMBER DECODER..................................................... 2
II. GENERAL.................................................................................... 3
III. PARTS ARRANGEMENT............................................................. 3
IV. FEATURES and OPTION
A. BASIC UNIT - STANDARD FEATURES............................... 4
B. OPTIONS and ACCESSORIES............................................ 5
V. DIMENSIONS............................................................................... 5
VI. BASIC OPERATING MODES
A. ENERGY RECOVERY MODE.............................................. 6
B. TEMPERING MODE (NEUTRAL AIR).................................. 6
C. HOW IT WORKS.................................................................. 6
VII. RECEIVING and INSPECTION
A. SHIPPING and PACKING LIST............................................ 6
B. SHIPPING DAMAGE........................................................... 6
C. REQUIREMENTS................................................................ 7
VIII. UNIT PLACEMENT and SUPPORT
A. POSITIONING (MIN CLEARANCES).................................. 7
B. DOWNFLOW APPLICATION............................................... 8
C. HORIZONTAL FLOW APPLICATION.................................. 8
IX. RIGGING and LIFTING............................................................... 9
X. UNIT INSTALLATION
A. DUCT SIZING and CONNECTION...................................... 9
B. GAS PIPING (OPTION)....................................................... 9
C. CONDENSATE DRAIN CONNECTIONS (OPTION)........... 10
D. WATER COIL CONNECTIONS (OPTION).......................... 11
E. DIRECT EXPANSION COIL CONNECTIONS(OPTION).....11
XI. ELECTRICAL CONNECTIONS
A. BASE UNIT POWER SUPPLY............................................ 12
B. POST-HEAT POWER SUPPLY (OPTION).......................... 12
C. PRE-HEAT POWER SUPPLY (OPTION)............................ 13
D. CONTROL WIRING.............................................................13
XII. BLOWER OPERATION
A. 3 PH VOLTAGE PHASING................................................ 14
B. SPEED SETTING.............................................................. 14
C. PULLEY ALIGNMENT........................................................ 14
D. BELT ADJUSTMENT.......................................................... 14
E. FIELD-FURNISHED BLOWER DRIVES............................ 15
XIII. OPTIONS (FACTORY INSTALLED)
A. ELECTRIC PRE-HEAT........................................................ 15
B. TEMPERING COILS........................................................... 15
C. ELECTRIC POST-HEAT...................................................... 16
D. GAS POST-HEAT................................................................ 16
E. MOTORIZED DAMPERS.................................................... 16
F. DIRTY FILTER SENSOR.................................................... 16
G. FROST CONTROL............................................................. 16
H. CO2 SENSOR.................................................................... 17
I. ROTATION SENSOR.......................................................... 17
J. SMOKE DETECTORS........................................................ 17
K. LOW AMBIENT KIT............................................................. 17
L. SENSIBLE-ONLY ERC....................................................... 17
M. MERV 11 and 13 AIR FILTERS.......................................... 17
N. ELECTRONIC TEMPERATURE CONTROL SYSTEM...... 17
O. FREE AIR APPLICATION................................................... 17
P. GFCI SERVICE OUTLET.................................................... 17
Q. EME INTAKE LOUVERS.................................................... 17
R. VFD BLOWER CONTROL................................................. 17
XIV. EVT SEQUENCE OD OPERATION........................................... 18
XV. UNIT STARTUP
A. WIRING............................................................................. 23
B. FAN WHEELS................................................................... 23
C. FAN RPM.......................................................................... 23
D. VIBRATION....................................................................... 23
E. TEMPERING COILS......................................................... 24
F. ENERGY RECOVERY CASSETTE.................................. 24
G. ELECTRIC POST-HEAT.................................................... 24
H. GAS POST-HEAT.............................................................. 24
XVI. ROUTINE MAINTENANCE
A. INTAKE HOOD MESH FILTER(S)..................................... 33
B. SUPPLY AND RETURN AIR FILTERS.............................. 33
C. TEMPERING COILS.......................................................... 34
D. ENERGY RECOVERY CASSETTE (ERC)........................ 34
E. GAS POST-HEAT............................................................... 35
F. BLOWER COMPONENTS................................................. 37
XVII. VFD FACTORY SET POINTS.................................................. 38
XVIII. WIRING DIAGRAMS............................................................... 47
XIX. FACTORY INSTALLED OPTIONS WIRING DIAGRAMS....... 49
XX. START UP INFORMATION SHEET........................................ 60
2 REVT-05ERV
I - MODEL NUMBER DECODER
1,2 3 4 5 6 7 8,9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
EVT XX XXXXXXXXXXXXXXXXXXXXX
Ruskin/RRS = EVT Smoke Detector
PennBarry = G A Intake Air
JCI/York = VT BExhaust Air
ProVent = EVT C Intake & Exhaust air
Wheel Air Flow Range Wheel Type
09 - 600 - 1000 cfm EEnthalpy-Non Mod.
19 - 900 - 1900 cfm FEnthalpy-Modulation. (stand alone 3 phase)
28 - 1600 - 2800 cfm SSensible-Non Mod.
36 - 2400 - 3600 cfm TSensible-Modilation. (stand alone 3 phase)
46 - 3000 - 4600 cfm Filter Type
62 - 3400 - 6200 cfm A2" Pleat Filters Merv 8
74 - 5400 - 7400 cfm B2" Pleat Filters Merv 11
88 - 6400 - 8800 cfm C2" Pleat Filters Merv 13
10 - 7600 -10000 cfm
Dirty Filter Sensor
12 - 8000 -12000 cfm FIntake Air Kit Only
Design Series E Exhaust Air Kit Only
EnERVent+
B B Fresh & Exhaust Air Kit
Stand Alone Series Filter Rack
Outdoor Downflow
D F Fresh Air Intake
Outdoor Side-By-Side
S E Exhaust Air
Indoor Horizontial
HBFresh & Exhaust Air
Indoor Downflow
YDrain Pans
Revision Level G Galvanized
First Generation
X S Stainless steel
Second Generation
A Control Package
Intake Blower Speed A
Standard Controls W/Contactors
Low SpeedL B
Standard Controls W/Contactors & Display
Meduim SpeedM C
BAS Controls W/VFDs
High SpeedH D
BAS Controls W/VFDs & Display
Exhaust Blower Speed C
CO2 Sensor
Low Speed
L R Rotation Sensor Kit
Meduim Speed
M Post-Heat
High Speed
H A Elec Stage #1
Voltage & Phase B Elec Stage #2
208-230v/3ph
23 C Elec Stage #3
460v/3ph
33 D Elec Stage #4
575v/3ph
43 E Spare
Coil Options F Spare
Gen 4 Cold Water Coil
A G Gas 2 stage (Outdoor only)
Gen 4 Hot Water Coil
B H Gas 5 to 1 (Outdoor only)
Gen 4 DX Coil
C J Gas 10 to 1 (Outdoor only)
Gen 4 Cold & Hot Water Coils
D
Gen 4 Dx & Hot Water Coils
E Pre-Heat
Gen 5 Cold Water Coil
F L Low
Gen 5 DX Coil
G H High
Gen 5 Cold & Gen 4 Hot Water Coils
H E Motorized Exhaust Hood Kit (Outdoor only)
Gen 5 DX & Gen 4 Hot Water Coils
I M Motorized Outside Air Damper Kit
Special DX (Split Tx Valve)
J
FAC controls in all controls
REVT-05ERV 3
These instructions are intended as a general guide and
do not supersede local codes in any way. Authorities
having jurisdiction should be consulted before installation.
This Manual covers Full Featured Energy Recovery
heat and tempering options designed to deliver neutral
air (outside air equal to or below the temperature of the
exhaust air) to the ventilated space, as well as additional
options designed to deliver an additional heating or
cooling load, See Page 15 for a full list and description
of options.
Communication and control of this unit can be achieved
through a bacnet compatible building automation system
like Metasys, or if ordered the unit can be controlled via
thermostat.
SUPPLEMENTAL POST-HEAT
FIGURE 1 - TYPICAL CABINET FEATURES AND OPTIONS
II - GENERAL
III - PARTS ARRANGEMENT
Figure 1 shows the parts arrangement for the typical
cabinet, including major standard features and factory-
be included in the unit being installed. The units shown
are typical of the entire series with regard to component
location, features, and options available
AIRFLOW CHOICE
BLOWER MOTOR
VIBRATION ISOLATORS
CONTROLS
MODULAR FRAME
EXHAUST AIR HOOD
OUTDOOR
AIR HOOD
DOUBLE-WALL CONSTRUCTION
DAMPER
AIR FILTERS
DEFROST CONTROLS
ACCESS DOOR
TEMPERING COILS
ENERGY RECOVERY CASSETTE
SILENT-PRO BLOWERS
BASE RAIL
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and
service must be performed by a qualied installer,
service agency or the gas supplier.
WARNING
Cancer - www.P65Warnings.ca.gov
4 REVT-05ERV
IV - FEATURES and OPTIONS (Figure 1)
A. BASIC UNIT - STANDARD FEATURES
1. BASE RAIL - Full perimeter, reinforced, heavy-gauge
base rail with forklift slots and rigging holes maintains
structural integrity during transportation, handling,
and installation.
2. MODULAR FRAME - Extruded aluminum Modular
Frame System adds structural strength and rigidity
to entire cabinet. Assures a square, sturdy overall
structure and frame for access doors and other
openings such as supply and return openings.
3. DOUBLE-WALL CONSTRUCTION - All exterior
panels, plus divider panel between supply and
exhaust chambers, are double-wall construction;
which, along with multiple modular framing cross
members, adds strength and rigidity to the top and
bottom panels. Each panel has an interior core of 1
and acoustical performance.
4. ACCESS DOORS - Hinged with tool-less, quarter-
turn latching handles that possess a "cam latch"
assuring tight air and water seal. Provide quick
access to components and protect panels and roof
from damage. Hinges and handles are made of high
5. AIRXCHANGE ERC - Standard Energy Recovery
Cassette is an all-welded stainless steel assembly
containing a desiccant coated (enthalpy) wheel.
Desiccant used is silica gel, which has superior
moisture handling capacity in the working range
above 30% R.H., the range of greatest concern.
Patented and proprietary process permanently bonds
desiccant to surface without adhesives permitting
long life with repeated washings without loss of
make easy cleaning and replacement possible and
credible and reliable performance per AHRI Standard
1060.
6. SILENT-PRO® BLOWERS - Manufactured
ground and polished steel mounted in permanently
lubricated, sealed, ball bearing pillow-block bearings
selected for a minimum life of L-10. All supply and
exhaust blowers are belt driven to allow independent
7. VIBRATION ISOLATORS - Both the supply and the
exhaust blowers are mounted on neoprene vibration
isolators providing additional acoustical performance.
8. BLOWER MOTORS and DRIVES - NEMA Premium
Policy Act of 1992. Base mount with easy adjustment
of belt tension. Mounting permits "slide-out" of motor
and adjustable mount for easy service or replacement.
horsepower. Low, medium, and high speed drive kits
are available to achieve required CFM range. Fixed
diameter cast iron pulley on blower with adjustable
EXTERIOR VIEWS
pitch cast iron sheave on motor - laser aligned for
V-belt connection.
9. AIRFLOW CHOICE
10. OUTDOOR AIR HOOD - Angled to prevent water
induction and includes 1 inch aluminum mesh mist
11. EXHAUST AIR HOOD - Shipped separately as an
dampers and cover screen.
12. AIR FILTERS - Supply and return MERV 8 (optional
MERV 11 and MERV 13 available), 2 inch pleated
13. CONTROLS - All internal electrical components
are factory wired for single-point power connection.
Units with electric pre-heat and/or post-heat are wired
where applicable and wired in compliance with
National Electric Code (NEC). Hinged external access
door to control box has an interlocking, fused NEMA
3R disconnect switch. Control box containing all
major electrical control components has removable
cover panel.
Direct Digital Controller - Unit controls are
performed by a Johnson Controls FEC programmable
direct digital controller with features that allow state
of the art commercial HVAC control. The controller
communicates with Building Automations Systems
Address, and baud rate set at the factory to customer
REVT-05ERV 5
B. OPTIONS and ACCESSORIES
14. DAMPERS
15. DEFROST CONTROL - Three types of frost control
available:
a. Electric pre-heater
b. Exhaust only (low ambient kit)
c. Modulating wheel frost control
Pre-Heater
heater with controls wired at the factory. Single point
16. SUPPLEMENTAL POST-HEAT - Two post-heaters
are available: Gas Fired (shown) and Electric.
Gas Fired Post-Heat
inducer, and redundant automatic 2-stage (EVT-28
options available are 5:1 modulation and; when a high
turn-down gas input ratio is needed; a split-manifold,
EVT-12 are stainless steel), and life cycle tested.
Stainless steel heat exchanger is an option, but
is required if mixed air temperature is below 45°F.
Electric spark ignition of burners on each operating
cycle. System permits main gas valve to stay open
only when the burners are proven to be lit. Should a
to burners. Ignition module has LED to indicate status
as troubleshooting aid. Ignition control is factory
installed in heating compartment. Redundant limit
setting. Heat limit controls protect heat exchanger
and other components from overheating. Flame roll-
proving switch protect system operation.
Electric Post-Heat
with controls wired at the factory. Single point power
heater option selected.
17. TEMPERING COILS - Copper tube and aluminum
410. Tubing and return bends are seamless copper
conforming toASTM B75 and ASTM B251 for standard
pressure applications. Designed to withstand 250
psi maximum operating pressures and a maximum
and are die-formed to provide self-spacing collars
which completely cover the entire tube surface.
Copper tubes are mechanically expanded to form an
Chilled and Hot Water - Design permits in-tube
water velocities up to 6 ft/sec. Headers have factory-
installed air vents and drain plugs placed at the highest
and lowest points respectively. MPT connections are
provided.
Direct Expansion - All copper tubing is internally
transfer performance. Factory-installed, externally
adjustable, Thermal Expansion Valve is standard.
Two-stage, interlaced circuiting is provided for the
EVT-46 and larger units with the Neutral Air Option
(See SECTION VI - TEMPERING MODE) and for the
EVT-28 and larger with the Neutral Air Plus Option.
PRODUCT SPECIFICATIONS - A summary of
ENERVENT+ series is listed in
Table 14. See Page 39.
V - DIMENSIONS
Overall unit dimensions are illustrated and tabulated in
Figure 2.
FIGURE 2 - OVERALL DIMENSIONS
JH
K
G
F
D
(BASE) B
EC
A
UNIT OVERALL DIMENSIONS (INCHES)
UNIT A B C D E F G H J K
EVT-09 / -19 93 ½47 ⁄ 92 ¼51 ¾11 ⁄ 6 ⁄ 17 ¾914 ⁄ 18 ¼
EVT-28 / -36 110 ⁄ 54 ⁄ 109 ⁄ 61 ⁄ 13 ⁄ 6 ¾20 8 ⁄ 15 ⁄ 18 ¼
EVT-46 / -62 135 ½70 134 ¼79 ½17 ½7 ¼24 ½11 ⁄ 20 ⁄ 18 ¼
EVT-74 / -88 149 ½76 ⁄ 148 90 ¼19 ¼11 ⁄ 29 12 ¼27 ¾21 ¼
EVT-10 / -12 161 ½88 ¼160 ¼101 ⁄ 21 10 ¾34 15 ⁄ 27 ¾21 ¼
6 REVT-05ERV
VI - BASIC OPERATING MODES
A. ENERGY RECOVERY MODE
continuously with one supplying the required VOLUME
of fresh outdoor air, and the other exhausting an equal
VOLUME of stale indoor air returned from the conditioned
space. Energy Recovery is achieved by slowly rotating
the Energy Recovery Wheel within its cassette framework,
known as the Energy Recovery Cassette, or ERC.
Duringwinter operationtheERC absorbsheat and moisture
from the return air stream during one half of a complete
revolution and recovers that energy by transferring it to
the cold, dryer outdoor air during the other half of the
same revolution. The process automatically reverses for
summer operation when heat and moisture are absorbed
from the fresh, outdoor supply air and transferred to the
return air stream being exhausted. This transfer of energy
This mode of operation allows outdoor air ventilation
rates to be increased by a factor of three or more without
cooling systems.
B. TEMPERING MODE
Neutral Air Option - Also available are cooling and
heating options installed after the ERC to further temper
the supply air to achieve a space neutral condition. This is
an ideal solution for applications requiring 100% outdoor
air.
Neutral Air Plus Option - If a cooling capacity beyond
that required to achieve a space neutral condition is
desired there is an option available that will meet that
requirement. This will provide a solution for applications
requiring 100% outdoor air, plus meet an additional
cooling load. See supplemental brochure for cooling
performance with matching condensing unit.
C. HOW IT WORKS
The ERC contains an Enthalpy Wheel that is a new
concept in rotary air-to-air heat exchangers. Designed as
a packaged unit for ease of installation and maintenance,
the standard unit (without optional features) requires only
the connection of electrical power to make the system
operational. The Enthalpy Wheel is coated with a Silica
Gel Desiccant using a patented and proprietary process
developed by the wheel manufacturer that permanently
bonds it to the polymer substrate without adhesives.
Even after years of operation and repeated washings, the
desiccant remains in place.
Silica Gel is a highly porous solid adsorbent material
that structurally resembles a rigid sponge. Water vapor
pressures; which drives water molecules into/from the
desiccant cavities to transfer moisture from the more
humid air stream to the dryer air stream.
Enthalpy is a term representing total heat energy, meaning
sensible heat energy plus latent heat energy. Sensible
and latent heat are the two components of total heat.
Sensible heat is the energy contained in dry air and can
a given VOLUME of air. While latent heat is the energy
contained in the water vapor within moist air.
During the summer cooling season the latent heat can
only be removed by condensing that vapor below its dew
point with the optional cooling coil (water or refrigerant)
the moist supply air stream and then transferring it to the
dryer return air stream, which exhausts it to the outside.
For buildings that require a large amount of outside air to
meet ventilation codes, this greatly reduces the cooling
load on the air conditioning system. An additional load
reduction can be achieved if the unit contains the optional
Tempering Coil.
In the winter heating season this vapor transfer capability
works to increase moisture in the supply air stream by
absorbing it from the return air. This reduces the amount
occupied space during the heating season. Since the
Enthalpy Wheel transfers moisture entirely in the vapor
phase, the wheel remains dry eliminating wet surfaces
that retain dust and promote fungal growth. Because it
is always dry and constantly rotating between the supply
and exhaust air streams, which reverses the direction of
When the outdoor air temperatures are below 15°F, it is
recommended to use the optional Low Ambient Kit
VII - RECEIVING and INSPECTION
Do not attempt to operate the unit if there is indication that
any part or control has been under water. Any control or
component that has been under water must be replaced
prior to start-up.
A. SHIPPING and PACKING LIST
1. Assembled ERV
2. Assembled Exhaust Hood
Inside ERV behind door marked:
"Filter Access-Exhaust."
3. Disassembled Intake Hood
Inside ERV behind door marked:
"Filter Access-Supply."
4. Flue Vent Hood (Gas Post-Heat Option)
Inside ERV behind door marked:
"Filter Access-Supply."
NOTE: The EVT 09/-19 will have Hoods attached
before shipping, remove during rigging for lifting if
they obstruct the lifting straps and reinstall after the
unit is set on its curb.
B. SHIPPING DAMAGE
The ERV is thoroughly inspected and test run at the
factory. Nevertheless, damage may occur during shipping
and handling; therefore, upon delivery, inspect the unit for
both obvious and hidden damage, and ensure all options/
accessories items are present.
Additional inspection steps:
CAUTION
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
contact with sharp edges.
REVT-05ERV 7
1. Turn each blower wheel by hand to ensure it turns
freely and does not bind.
2. Inspect dampers (if supplied) for free operation of all
moving parts.
3. If damage is found, record all necessary information
carrier.
C. REQUIREMENTS
If the unit is stored for any length of time prior to installation
it must be stored in the original crate and protected from
dust, debris, and weathering. If storage is in a humid,
dusty or corrosive atmosphere, rotate the blowers and
purge the bearings once a month. Improper storage
resulting in damage to the unit or components will void
the warranty.
Use of this unit as a construction heater is not
recommended during any phase of construction. If it has
been used for heating of buildings under construction, the
following conditions must be met or the warranty will be
void:
• The Intake Hood must be installed per these
installation instructions.
• The Flue Vent Hood (gas heat option) must be
installed.
• A room thermostat must control the unit; i.e., the
heating is not allowed.
•
completion.
• The input rate and temperature rise must be set
per the unit rating plate.
•
ignition, input rate, temperature rise, and venting)
instructions.
VIII - UNIT PLACEMENT and SUPPORT
A. POSITIONING (MIN CLEARANCES)
General Unit Requirements
Do not position the unit with the outdoor air intake into the
prevailing wind and keep the intake away from any other
exhaust fans. Likewise, position the exhaust discharge
opening away from the outdoor intakes of other units.
The following items must be completed prior to rigging
and lifting the ERV onto the roof.
WARNING
Electric shock hazard and danger of
explosion. Can cause injury, death
or product or property damage. Turn
o gas and electrical power to unit
before performing any maintenance or
servicing operations on the unit. Follow
lighting instructions attached to unit
when putting unit back into operation
and after service or maintenance.
MINIMUM CLEARANCES (INCHES)
UNIT A B C D
EVT-09/-19 48 36 42 42
EVT-28/-36 48 36 48 42
EVT-46/-62 48 36 60 48
EVT-74/-88 48 42 72 48
EVT-10/-12 48 48 84 48
SUPPLY AND RETURN DUCT OPENINGS DIMENSIONS (INCHES)
UNIT A B C D E F G H J
EVT-09/-19 18 16 18 16 3 ¾6 ½11 9 7
EVT-28/-36 22 22 ⁄ 22 ⁄ 22 ⁄ 3 ⁄ 7 ⁄ 9 ¾10 6 ⁄
EVT-46/-62 28 28 28 28 4 ⁄ 8 ⁄ 13 ¼13 ⁄ 7
EVT-74/-88 33 ⁄ 34 ⁄ 34 34 4 ⁄ 12 ⁄ 11 ⁄ 12 ⁄ 6 ⁄
EVT-10/-12 34 42 42 34 6 8 ⁄ 15 ⁄ 15 7 ¼
A
A
A F
G
B
B
E
D
E
C
C
H
J
D
B
C
D
FIGURE 3 - MINIMUM CLEARANCES
FIGURE 4 - DUCT OPENINGS
ALL UNITS WITH GAS POST-HEAT
OPTION - 42 INCH MINIMUM
TO COMBUSTIBLE MATERIAL
8 REVT-05ERV
1. Roof Mounting Frame (RMF) must be positioned to
provide minimum clearances shown in Figure 3.
2.
accordance with the manufacturer’s instructions
provided with the frame.
3. RMF should be square and leveled to ⁄ inch per
linear foot (5mm per linear meter) in any direction.
4. Roof openings for ducts must be complete and ducts
installed by attaching to the RMF and not to the unit.
See Figure 4
Return openings in the unit.
5. Roof curb gasket must be applied to all top surfaces
of the curb
Gas Heat Unit Requirements
1.
adjacent building openings, such as windows, fresh
air intakes, etc.
2.
public walkways, operable windows and other
building openings shall conform to local codes. In the
absence of applicable local codes, installation shall
conform to the National Fuel Gas Code ANSI Z223.1,
or CAN/CGA B-149 Installation Codes.
3.
should be protected. A minimum of 42 inches must
be provided from any combustible materials.
4. Avoid locating in an area where deep snow is likely
to accumulate. During winter months keep snow
clear on access side of unit to prevent blockage of
5.
from electric meters, regulators and relief equipment.
In Canada this minimum clearance is 72 inches.
6. To prevent premature heat exchanger failure, do not
locate unit where chlorinated, halogenated or acid
vapors are present.
7. Unit must not be installed in a potentially explosive,
8. Do not modify or obstruct the combustion air inlet,
9. Local codes may supersede any of the proceeding
provisions.
B. DOWNFLOW APPLICATION
NOTE: In downow applications, units equipped
with the post-heat option (gas or electric) must
be installed on a non-combustible surface only
unless installed on a Ruskin 022E1 Roof Mounting
Frame.
* DISCLAIMER for Indoor and Outdoor applications:
RRS shall not be liable for any consequential,
Incidental, contingent, indirect, special, punitive
CAUTION
In downow applications, do not drill or punch
holes in base of unit. Leaking in roof may occur if
unit base is punctured.
or liquidated damages whatsoever as a result of
purchasing another vendors roof curbs or other
accessories that have not been rst approved by
RRS.
Therefore any failures of said equipment due to the
non-use of RRS roof curb accessories, will render
any warranties provided with said equipment to
be null and void.
Roof Mounting with Ruskin 022E1 RMF
1. Securely fasten RMF to roof per local codes.
2.
accordance with the manufacturer’s instructions
provided with the frame.
3. The RMF should be square and level to ⁄ inch per
linear foot (5 mm per linear meter) in any direction.
4. Supply and return ducts must be attached to the RMF
and not to the unit and plenums must be installed
before setting the unit.
Roof Mounting with Installer’s RMF
structures. However, items to keep in mind when not
using a manufacturer’s roof mounting frame.
1. The Enervent base is fully insulated, so an enclosed
frame is not required.
2. The frame or support must be constructed with non-
combustible materials and should be square and
level to ⁄ inch per linear foot (5 mm per linear meter)
in any direction.
3. Frame or support must be high enough to prevent
any form of moisture from entering the unit.
Recommended minimum frame height is 14 inches
(356 mm)
4. Ducts must be attached to the roof mounting frame
and not to the unit. Supply and return plenums must
be installed before setting the unit.
5. Units require support along all four sides of unit base.
Supports must be constructed of steel or suitably
treated wood materials.
6. When installing a unit equipped with optional gas
or electric post-heat on a combustible surface, a
RMF must be provided to Ruskin Rooftop System’s
C. HORIZONTAL FLOW APPLICATION
NOTE: In horizontal ow applications, units equipped
with the post-heat option (gas or electric) may be
installed on combustible surfaces.
All exterior ducts joints and openings in roof or building
and sealing compounds in accordance with applicable
codes. Any duct passing through an unconditioned space
must be insulated.
1. The supply and return air ducts connect to the unit’s
2.
when positioning units. Refer to Figure 3.
3. Unit requires support along all four sides of unit base.
REVT-05ERV 9
Supports must be constructed of steel or suitably
treated wood materials.
4. If slab-mounted: top of support slab should be
ground can collect around the unit.
5. The bottom supply and return duct openings should
be closed with factory supplied panels, best practice is
to double check that these were ordered and installed
correctly before the unit is set on a slab or curb.
XI - RIGGING and LIFTING
1. Remove all shipping materials from the unit.
2. All panels must be in place before rigging.
3. Remove the forklift channels from the base frame
before setting the ERV on a roof curb.
4. Proper rigging and handling of the equipment is
mandatory during unloading and setting it into position
to retain warranty status.
5.
responsible for the handling and setting of the unit on
the roof curb.
6. Rigger should use suitable mating hardware to attach
to the unit’s lifting holes located on the base frame.
Refer to Table 1 to for unit weights.
Important: A properly qualied rigging professional
should be responsible for the handling and
setting of the unit on the roof curb.
UNIT MAXIMUM WEIGHT
LBS KG
EVT-09 1,510 680
EVT-19 1,670 760
EVT-28 2,610 1,180
EVT-36 2,780 1,260
EVT-46 3,080 1,400
EVT-62 3,330 1,510
EVT-74 5,210 2,360
EVT-88 5,560 2,520
EVT-10 6,230 2,830
EVT-12 6,670 3,030
TABLE 1 - MAXIMUM UNIT WEIGHTS WITH ALL OPTIONS
SPREADER BARS WIDER THAN THE UNIT’S WIDTH SHOULD
BE USED TO PREVENT DAMAGE TO THE ERV’S CABINET
FIGURE 5 - RIGGING UNIT FOR LIFTING
LIFTING POINT SHOULD BE DIRECTLY
ABOVE CENTER OF GRAVITY
IMPORTANT - ALL PANELS MUST
BE IN PLACE FOR RIGGING
CAUTION - DO NOT WALK ON UNIT
X - UNIT INSTALLATION
A. DUCT SIZING and CONNECTION
NOTE: Recommended duct sizes shown in Figure 4
result in duct velocities over the published cfm range
for each model of approximately 300 feet per second
minimum for the EVT-09 (600 cfm) to approximately
1200 feet per second maximum for the EVT-12 (12,000
cfm).
1. No holes should be drilled into the base of the Unit
for the installation of ductwork, all ductwork should be
attached to a roof curb that is either factory supplied
NOTE: The EVT 09/-19 will have Hoods attached
before shipping, remove during rigging for lifting if
they obstruct the lifting straps and reinstall after the
unit is set on its curb.
2. Installation of ducts should be done in accordance
with SMACNA and SMCA guidelines.
3.
should have the bottom supply and return openings
IMPORTANT: All downow units with any Gas or
Electric post heat options must have a sheet metal
L or T shaped supply duct that makes a transition
from vertical to horizontal directly below the
supply opening. No outlets or registers should be
placed directly below the supply opening.
B. GAS PIPING (OPTION)
NOTE: Before connecting gas piping, check with gas
provider or local authorities having jurisdiction
for local code requirements. When installing gas
supply piping, length of run from gas meter must
be considered in determining pipe size for 0.5
i.w.c. (0.12 kPa) maximum pressure drop. Do not
use supply pipe smaller than unit gas connection.
For natural gas units, operating pressure at the
unit gas connection must be a minimum of 4.7
i.w.c. (1.17 kPa) and a maximum of 10.5 i.w.c. (2.60
kPa).
Connect Gas Piping
1. All gas piping shall conform with local codes and
ordinances or, in the absence of local codes, to the
National Fuel Gas Code or ANSI Z223.1. In Canada,
installation must be in accordance with CAN/
CGA-B149.1 for Natural Gas.
10 REVT-05ERV
2.
must be installed immediately adjacent to the point
where the gas supply enters the cabinet. Codes may
union be installed and that the union must be of the
ground joint type. See Figure 6.
3. Always use clean, scale-free pipe and malleable iron
prior to connecting pipes.
4. Firmly support the gas piping so that it cannot be
dislodged from its installed position.
A. DUCT SIZING and CONNECTION
NOTE: Recommended duct sizes shown in Figure 4
result in duct velocities over the published cfm range
for each model of approximately 300 feet per second
minimum for the EVT-09 (600 cfm) to approximately
1200 feet per second maximum for the EVT-12 (12,000
cfm).
1. No holes should be drilled into the base of the Unit
for the installation of ductwork, all ductwork should be
attached to a roof curb that is either factory supplied
2. Installation of ducts should be done in accordance
with SMACNA and SMCA guidelines.
3.
should have the bottom supply and return openings
IMPORTANT: All downow units with any Gas or
Electric post heat options must have a sheet metal
L or T shaped supply duct that makes a transition
from vertical to horizontal directly below the
supply opening. No outlets or registers should be
placed directly below the supply opening.
B. GAS PIPING (OPTION)
NOTE: Before connecting gas piping, check with gas
provider or local authorities having jurisdiction
for local code requirements. When installing gas
supply piping, length of run from gas meter must
be considered in determining pipe size for 0.5
i.w.c. (0.12 kPa) maximum pressure drop. Do not
use supply pipe smaller than unit gas connection.
GROUND JOINT UNION
DRIP LEG
MANUAL SHUT-OFF VALVE
GAS PIPING SUPPORT
TO GAS SUPPLY (REFER TO LOCAL CODES)
FIGURE 6 - GAS SUPPLY PIPING
For natural gas units, operating pressure at the
unit gas connection must be a minimum of 4.7
i.w.c. (1.17 kPa) and a maximum of 10.5 i.w.c. (2.60
kPa).
Connect Gas Piping
CAUTION
Some soaps used for leak detection are corrosive
to certain metals. Carefully rinse piping thoroughly
after leak test has been completed. Do not use
matches, candles, ame or other sources of ignition
to check for gas leaks.
1. All gas piping shall conform with local codes and
ordinances or, in the absence of local codes, to the
National Fuel Gas Code or ANSI Z223.1. In Canada,
installation must be in accordance with CAN/
CGA-B149.1 for Natural Gas.
2.
must be installed immediately adjacent to the point
where the gas supply enters the cabinet. Codes may
union be installed and that the union must be of the
ground joint type. See Figure 6.
3. Always use clean, scale-free pipe and malleable iron
prior to connecting pipes.
4. Firmly support the gas piping so that it cannot be
WARNING
Danger of explosion. Can cause injury
or product or property damage. Do not
use matches, candles, ame or other
sources of ignition to check for leaks.
MAIN CONDENSATE
DRAIN (SEE FIGURE 12)
ROOF MOUNTING FRAME
ROOF STRUCTURE
DRAIN P-TRAP
FIGURE 7 - CONDENSATE ROOF DRAIN
NOTE: Use a PVC T-tting with a cap to provide
washout access for the P-trap.
REVT-05ERV 11
MAIN CONDENSATE
DRAIN (SEE FIGURE 12)
ROOF MOUNTING FRAME
ROOF STRUCTURE
OPEN VENT
MINIMUM PITCH:
1 IN. PER 10 FT.
OF LINE LENGTH
FIGURE 8- CONDENSATE DRAIN CONNECTION
dislodged from its installed position.
5.
the appliance. Refer to the unit rating plate for total
input.
6.
of the unit.
7. For the unit to operate properly, the inlet gas pressure
must be maintained at 7.0 i.w.c. for Natural Gas.
Maximum inlet pressure must not exceed 13.0 i.w.c.
to prevent damage to the gas valve.
8. A ⁄ inch NPT tap is provided on the inlet of the gas
gauge capable of measuring gas pressure should be
connected to the valve at this tap.
9. A drip-leg shall be provided at any point in the gas line
where condensate and sediment could collect.
10.
before turning on the unit.
Pressure Test Gas Piping
NOTE: The appliance gas valve can be damaged if
subjected to more than 0.5 psig (3.48 kPa).
RETURN CONNECTION - COLD WATER COIL
RETURN CONNECTION - HOT WATER COIL
SUPPLY CONNECTION - HOT WATER COIL
AUXILIARY CONDENSATE DRAIN
MAIN CONDENSATE DRAIN
SUPPLY CONNECTION - COLD WATER COIL
NOTE: FOR CONNECTION SIZE AND TYPE SEE TABLE 3.
FIGURE 9 - DRAIN CONNECTIONS
EXTERNAL CONNECTIONS
TEMPERING COILS CONDENSATE GAS
UNIT
WATER
COILS
DIRECT
EXPANSION MAIN & AUX 2 STAGE & 5:1
MODULATION
SPLIT
MANIFOLD 10:1
MODULATION
SUPPLY &
RETURN LIQUID SUCTION
EVT-09 1 MPT
⁄ SWT ¾ SWT
¾MPT
¾MPT
NA
EVT-19
½SWT
⁄ SWT
EVT-28 1 ¼MPT 1 ⁄ SWT
EVT-36
¾MPT
EVT-46 1 ½MPT ⁄ SWT
1 ⁄ SWT 1 MPT
EVT-62
EVT-74 2 MPT
¾SWT
EVT-88
EVT-10
2 ½MPT 1 MPT 1 MPT
EVT-12
TABLE 2 - EXTERNAL CONNECTIONS - SIZE AND TYPE
1.
before turning on the unit.
2. Isolate the gas valve from the gas supply system
disconnecting it from the gas supply piping system
during any pressure testing equal to or more than 0.5
psig (3.48 kPa).
3. After all connections have been made and the valve
connections for gas leaks, using only a leak detection
solution or other preferred means. DO NOT use
matches, candles or other sources of ignition to check
for gas leaks.
C. CONDENSATE DRAIN CONNECTIONS (OPTION)
Units ordered with a Cooling Coil Option are provided
optional) drain pan with a male, 1 inch N.P.T. main and
shown in Figure 7. A trap must be installed between
drain connection and an open vent for proper condensate
removal. It is recommended that the auxiliary drain also
be connected to a drain line. This line does not require
a trap or vent. If not connected, it must be plugged with
provided cap.
It is sometimes acceptable to drain condensate onto the
roof or grade. In this case a simple drain trap as shown in
Figure 7 may be suitable. If draining onto a roof, place a
drip pad below drain to protect roof.
If draining onto roof is not acceptable, a drain line must
be attached to the trap. In this case the main drain must
Figure 8 where
the condensate is routed downward to an open drain or
sump. Local codes may require drainage into a waste
water system. Do not connect drain to a closed waste
system. Additionally, the condensate line must be vented
and pitched away from the unit at least 1 inch for every 10
feet of line length. On longer runs, an air break should be
used to ensure proper drainage. Be certain to check local
codes concerning condensate disposal.
Drainage problems can also result from a lack of
12 REVT-05ERV
ACCESS DOOR - THERMOSTATIC EXPANSION VALVE
SUCTION LINE CONNECTION - REFRIGERANT COIL
LIQUID LINE CONNECTION - REFRIGERANT COIL
AUXILIARY CONDENSATE DRAIN
MAIN CONDENSATE DRAIN
FIGURE 10 - DRAIN CONNECTIONS
maintenance. Algae can form in the drain pan and
backup into the unit. Regular maintenance can prevent
this condition.
XI - ELECTRICAL CONNECTIONS
D. WATER COIL CONNECTIONS (OPTION)
Factory installed water coils for cooling and heating
are located after the ERC and before the blower on
the supply side of the unit. Note the supply and return
water connections extending outside the unit above the
condensate drain as shown in Figure 9.
TXV ACCESS COVER
EXTERNALLY
ADJUSTABLE TXV
FIGURE 11 - THERMOSTATIC EXPANSION VALVE
Electrical connections must conform to all local codes and
to current National Electric Codes (NEC) and Canadian
Electric Codes (CEC). Refer closely to unit wiring diagram
for proper wiring connections.
Refer to nameplate on Base Unit and on Electric Heat
Options (Pre- and Post-Heat) for minimum circuit ampacity
Ground Base Unit with a suitable ground connection,
either through unit supply wiring or an earth ground.
Power supply entries must be sealed weather tight after
wiring is complete.
A. BASE UNIT POWER SUPPLY
WARNING
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
Do not apply power or close disconnect switch until
installation is complete. Refer closely to start-up directions
and to unit wiring diagram on inside of control box access
door or see Pages 47-57, Electric and Gas Post-Heat unit
wiring diagrams respectively. Wiring diagrams for each
pre-heat and post-heat (electric and gas) option can be
found in SECTION XVIII - WIRING DIAGRAMS
1. 230/460/575 volt units are factory wired. For 208V
supply, remove the connector from the 208V terminal
and the wire from the 230V terminal on each of the
control power transformers (2). Place the connector
on the 230V terminal and connect the wire to the
208V terminal.
2. Route power through exterior panel below the Control
Box. Recommended entry location is indicated by
Drill Location Sticker (Figure 12). Power is then
routed upward through the bottom of the Control Box
and wired into the factory supplied Disconnect Switch
BASE UNIT ELECTRICAL
FACTORY SUPPLIED
DISCONNECT SWITCH
BASE UNIT ELECTRICAL
SERVICE ENTRANCE
ELECTRIC POST-HEAT ELECTRICAL
SERVICE ENTRANCE
FIGURE 12 - FIELD ELECTRICAL SERVICE ENTRANCE
DRILL LOCATION STICKER
B. POST-HEAT POWER SUPPLY (OPTION)
Do not apply power or close disconnect switch until
installation is complete. Refer to start-up directions.
Refer closely to unit wiring diagram on inside of Post-
Heat Control Box cover.
1. Route power through exterior panel to the left of
Base Unit power entry. Again the recommended
entry location is marked by Drill Location Sticker (two
if Post-Heat input is greater than 60kw) shown in
Figure 12.
2. EVT-09 and -19 - After entry through exterior panel,
wires are routed down through the Blower Deck into
the top of Post-Heat Control Box and connected to
the Power Distribution Block.
REVT-05ERV 13
3. EVT-28, -36, -46, -62, -74, -88, -10 and -12 - After
entry through exterior panel, wires are routed up into
the back side of factory installed Post-Heat Fuse Box
to the Power Distribution Block(s).
C. PRE-HEAT POWER SUPPLY (OPTION)
Do not apply power or close disconnect switch until
installation is complete. Refer to start-up directions.
Refer closely to unit wiring diagram on inside of Pre-Heat
Control Box cover. (NOTE - A typical Pre-Heat wiring
diagram can be found on Page 58 for general reference
only.)
1. Route power through front panel below and to the
right of the Intake Hood as noted in Figure 13.
Recommended location of entry is marked with a Drill
Location Sticker. Route through bottom of Pre-Heat
Control Box and connect to Power Distribution Block.
PRE-HEAT ACCESS DOOR
PRE-HEAT CONTROL BOX W/ HINGED COVER
FIGURE 13 - PRE-HEAT ELECTRICAL SERVICE ENTRANCE
D. CONTROL WIRING
Route low voltage control wire from thermostat or energy
management through small bushing in the upper right
corner of the Base Unit Control Box as shown in Figure
14.
PRE-HEAT ELECTRICAL
SERVICE ENTRANCE
EXHAUST AIR HOOD
OUTDOOR AIR HOOD
GAS POST HEAT OPTION
PRE-HEAT ELECTRICAL
SERVICE ENTRANCE
FIGURE 14 - THERMOSTAT CONTROL CONNECTIONS
IMPORTANT - Unless eld thermostat wires are rated
for maximum unit voltage, they must be routed
away from line voltage wiring.
1. Dependent Thermostat controlled units should use
a class II low voltage wire with at least 6 conductors.
2. Dedicated Thermostat - In the instance when an
connected to an HVAC system or BMS the control
terminals from the thermostat can be connected to
the corresponding terminals on the unit and 24v can
be taken from the 24v+ terminal (blue wire) on one of
the transformers
3. Energy Management System (EMS) - Connect the
shielded communication wire to the FC-Bus terminal,
24v+ to 1, Com to 2, Ground to 3.
See Sequence of Operations for EMS Details
14 REVT-05ERV
FIGURE 15 - TYPICAL CONTROLS LAYOUT
INPUT/OUTPUT
EXPANSION #1
WHEEL CONTACTOR POWER DISCONNECT
FAC CONTROLLER
INPUT/OUTPUT
EXPANSION #2
CONTROLLER RELAYS
TRANSFORMERS
BMS CONNECTION
TERMINAL STRIP
XII - BLOWER OPERATION
A. 3 PH VOLTAGE PHASING
Three phase blower motors must be phased sequentially
to ensure correct rotation and operation. Motors are
wired in phase at the factory. Check for proper blower
at the thermostat. Correct rotation is determined by
observing the wheel from the drive side and should match
not correct, direction can be reversed by interchanging
control box. Make certain the connections are tight. Do
not reverse wires at blower contactor.
B. SPEED SETTING
All drives are factory set at mid-range.
1. Determine Required RPM - Starting with desired
supply side (outdoor air) CFM use Chart 1 on Page 40
to determine the internal static pressure (ISP) drop for
each option. Total these values and add the external
static pressure (ESP), then refer to Chart 2 on Pages
41-43. Using this total SP (ISP + ESP) value, along
with the desired CFM, determine the RPM and BHP
required at that operating point. Adjust the blower
RPM by opening or closing the motor pulley. Loosen
the Allen screw and turn adjustable pulley clockwise
to increase RPM and counterclockwise to decrease
RPM.
Repeat this process for the return (exhaust) side to
determine the RPM and BHP requirements for that blower.
C. PULLEY ALIGNMENT
All Pulleys are laser aligned in the factory during
production, movement of the pulleys is possible however
if the set screws weren’t properly torqued down during
adjustment. Make sure blower and motor pulleys are
aligned as shown in Figure 16 before commissioning is
complete.
D. BELT ADJUSTMENT
Maximum belt life can be obtained only if proper pulley
alignment and belt tension are maintained. Tighten new
belts after 24-48 hours of operation. This is necessary
to allow for belt stretch and for belts to seat into grooves.
1. Loosen four nuts securing blower motor to adjustable
base. To increase belt tension turn motor mount
adjustment screw counterclockwise. Turn adjustment
screw clockwise to decrease belt tension.
2. Check belt tension as follows:
a. Measure center distance (CD) between blower
and motor shafts as noted in Figure 17.
b. Apply force perpendicular to CD line with enough
⁄ inch per inch (1.5 mm
CD of 24 inches would be ⁄ inch, or ⁄ inch.
c.
kPa). A force below these values indicates an
under tensioned belt and a force above, an over
tensioned belt.
REVT-05ERV 15
FIGURE 16 - PULLEY ALIGNMENT & BELT TENSION
VARIABLE PITCH MOTOR PULLEY
ALLEN SCREW
FIXED PITCH BLOWER PULLEY
BLOWER ASSEMBLY SLIDING BASE
(EVT-10 & EVT-12 ONLY)
ADJUSTABLE MOTOR MOUNT
BELT TENSION ADJUSTING SCREW(S)
TO INCREASE RPM:
Loosen motor pulley allen screw and turn pulley clockwise.
TO DECREASE RPM:
Loosen motor pulley allen screw and turn pulley counter clockwise.
TO INCREASE BELT TENSION:
1. Loosen four nuts securing blower motor to adjustable motor mount.
2. Turn belt tension adjusting screw(s) clockwise to move the motor downwards
increasing belt tension.
3. See Figure 19 to determine proper belt tension.
4. Re-tighten four nuts loosened in Step 1.
NUTS (4) SECURING MOTOR TO BASE
NUTS (4) SECURING MOTOR TO BASE
PULLEYS NOT ALIGNED
PULLEYS ALIGNED
0.7904
FIGURE 17 - BELT TENSION DETERMINATION
E. FIELD-FURNISHED BLOWER DRIVES
Charts 1 and 2
on Pages 40-43 as described in B.1. of this section to
determine BHP and RPM required. Use Chart 3 on
Pages 44-45 to determine components required for a)
the desired rpm, b) the Ruskin part number and c) the
corresponding manufacturer’s part number.
20 INCHES
(EXAMPLE
DEFLECTION FORCE:
NEW BELT = 5 LB (35 kPa)
USED BELT = 7 LB (48 kPa)
DEFLECTION F DISTANCE:
⁄ INCH PER INCH OF CENTER (CD)
- FOR THIS EXAMPLE (CD = 20); 20 x ⁄ = ⁄ INCH
XIII - OPTIONS (FACTORY INSTALLED)
A. ELECTRIC PRE-HEAT
Pre-Heaters are standard as 2-stage, step control. Step
control heaters are designed with multiple stagers made
up of equal increments of heating capacity. For example, a
10 kw heater with two stages will be composed of two 5 kw
stages. Pre-Heaters are single point wired at the factory.
mounted in the outdoor air stream after the pre-heater
to turn the pre-heater on. See Frost Control Application/
Operation for typical set points. If the temperature falls
below the set point and the wheel pressure drop sensor
stage will also turn on.
B. TEMPERING COILS
Factory installed cooling and/or heating coils are mounted
downstream of the Energy Recovery Cassette (ERC) on
the supply air side of the unit. All connections are located
external to the unit. Water coil connections are wrought
copper MPT, and refrigerant coil connections (suction and
liquid) are SWT. All coils are copper tubing and aluminum
Water System - Chilled and hot water coils may be
ordered together or separate in a given unit for installation
in either a four-pipe or a two-pipe system respectively.
Water coils are not normally recommended for use with
entering air temperatures below 40°F; but, while no
coils, the ERC does maintain an air temperature higher
than 40°F entering the coil. However; glycol solutions, or
low entering air temperatures. Additionally, continuous
Control of hot and cold water solenoids uses the same W1,
W2 / Y1, Y2 outputs from the controller as Gas/Electric
Post Heat and DX Cooling Coil. A separate controller is
required for Modulating Solenoids.
Refrigerant System - Evaporator Coil performance is
condenser matched to the Coil. An externally adjustable,
on the Evaporator Coil in order to match any 3rd Party
R-410a condenser on the market. Providing the TXV
with liquid line connection external to the unit reduces
installation time and provides peak cooling performance
across the entire application range.
As a guide for selecting a matching R-410a condensing
for each unit as shown in Table 3 on Page 16.
UNIT TXV NOM SIZE
NEUTRAL AIR NEUTRAL AIR PLUS
EVT-09 1.5 TON 4 TON
EVT-19 4 TON 8 TON
EVT-28 6 TON 12 TON
EVT-36 8 TON 15 TON
EVT-46 10 TON 20 TON
EVT-62 13.5 TON 26 TON
EVT-74 16 TON 32 TON
EVT-88 19 TON 37 TON
EVT-10 21 TON 43 TON
EVT-12 26 TON 50 TON
16 REVT-05ERV
TABLE 3 - MINIMUM CFM WITH ELECTRIC POST-HEAT OPTION
C. ELECTRIC POST-HEAT
Post-Heat will stage on and cycle with thermostat
demand. Number of stages will vary depending on Post-
Heat assembly. See Post-heat wiring diagram on unit
for sequence of operation. Limit controls are factory-
set and are not adjustable. A minimum air volume must
be maintained through Post-Heat section per Table 3 to
avoid tripping the limit during long periods of operation.
D. GAS POST-HEAT
Construction - Heat exchanger is tubular construction.
the EVT-10 and EVT-12 where stainless steel is required.
Stainless steel is optional for all other units unless the
air temperature supplied to the heat exchanger is below
steel, with direct spark ignition and the gas valve is a
Controls - Ignition Control provides positive, direct
ignition of burners on each operating cycle. The system
permits main gas valve to stay open only when burners
Ignition module has coded LED to indicate status and
aid in troubleshooting. Redundant limit controls are
controls protect heat exchanger and other components
combustion air proving switch protect system operation.
Available Selections - See Chart 4 on Page 46 for
Chart
5 on Page 46 lists performance data for all gas heat units.
E. MOTORIZED DAMPERS
Intake Air - Damper mounts behind the outdoor air intake
ELECTRIC POST-HEAT - REQUIRED MINIMUM AIR FLOW
UNIT NON CFM MAX KW NO
STAGES KW AVAIL MIN CFM
EVT-09 1,000 9.6 1 9.6 800
EVT-19 1,900 19.2 2
1
19.2
9.6
1,600
800
EVT-28 2,800 19.2 1 19.2 1,600
EVT-36 3,600 19.2 2
1
38.4
19.2
3,200
1,600
EVT-46 4,600 38.4 2
1
38.4
19.2
3,200
1,600
EVT-62 6,200 57.6
3
2
1
57.6
38.4
19.2
4,800
3,200
1,600
EVT-74 7,400 60 2
1
60
30
5,000
2,500
EVT-88 8,800 90
3
2
1
90
60
30
7,500
5,000
2,500
EVT-10 10,000 90
3
2
1
90
60
30
7,500
5,000
2,500
EVT-12 12,000 120
4
3
2
1
120
90
60
30
10,000
7,500
5,000
2,500
Exhaust Air - Mounts between the exhaust blower and
the return air exhaust hood. Operates in conjunction with
motor.
F. DIRTY FILTER SENSOR
Measures pressure drop across Intake and Exhaust
require maintenance.
G. FROST CONTROL
Extremely cold outdoor air temperatures can cause
moisture condensation and frosting on the energy
recovery wheel (ERW). The temperature below which
frost will begin to accumulate is referred to as the Frost
Threshold Temperature, and is a function of both outside
temperature and indoor relative humidity (See Table 4).
ERW; therefore, without frost control, energy recovery
Frost control is an optional feature that will control wheel
frosting. Three frost Control options are available:
1. Exhaust Only
2. Variable ERW Speed
3. Electric Pre-Heat
FROST THRESHOLD TEMPERATURE (OD DB)
INDOOR
RH (%)
INDOOR DB TEMPERATURE
70oF 72oF 75oF 80oF
20 -14 -13 -11 -8
30 -3 -2 -1 3
40 5 7 9 11
50 13 13 15 18
60 18 19 21 26
Exhaust Only - An exhaust temperature sensor value
will signal the controls to shutdown the supply blower
when the temperature in the exhaust quadrant reaches
temperature can only be reached when the wheel is
frosted over. Normal operation resumes after a heat rise
space, automatic or pressure operated fresh air dampers
may be required as part of the ventilation system.
Modulating Wheel Frost Control - The modulating
wheel feature uses a variable frequency drive to modulate
the wheel’s speed based on outside air temperature. The
wheels RPM will slow as the temperature drops, hence
icing up. The variable frequency drive is programmed to
not interfere with the wheel rotation sensor’s operation.
Values in Table 5 have been derived from the accepted
empirical model to allow entering supply air to remove all
water deposited on the wheel by the exhaust. This option
is best used for applications where the hours required for
frost control are limited.
Electric Pre-Heat - This is the recommended method
of preventing frost formation while ensuring required
ventilation rates for most cold climate applications. A
constant air temperature, above the frost threshold, is
TABLE 4 - FROST THRESHOLD GUIDELINES
REVT-05ERV 17
maintained entering the ERC by cycling a 2-stage electric
heat unit located just after the fresh air hood. The heater
located at the inlet of the wheel. If the temperature falls
not satisfy the load, the second stage turns on. See Pre-
Heat wiring diagram for circuit logic.
H. CO2SENSOR
Helps control indoor air quality based on CO2levels in
the occupied space. High CO2levels can either trigger
a response from the ERV unit by turning on the blowers
to bring in fresh air or by modulating the blowers if a
VFD option has been selected. See Basic Unit wiring
diagram for circuit information.
I. ROTATION SENSOR
The circuit indicates the absence of pulses, within a
detecting a magnet mounted on wheel surface. After the
initial time delay of approximately 5 seconds from circuit
power up, if the sensor fails to provide a signal pulse
(no wheel rotation) within approximately 5 additional
seconds, the alarm relay will activate the latch (until circuit
powers down) providing a 5 amp contact closure output.
This would indicate no wheel rotation and/or magnet in
the system has stopped at the magnetic sensor pickup
point. If the pulse (wheel rotation) is detected within the
approximately 5 second time period, the alarm relay will
be required.
J. SMOKE DETECTORS
Duct mounted smoke detectors can be installed in both
return and/or supply air streams. Signals from the smoke
detectors can be set to start-up or shut-down the ERV unit
if smoke is detected. See Basic Unit wiring diagram for
circuit information.
K. LOW AMBIENT KIT
Limits HVAC system operation when outdoor temperature
is below 10°F.
L. SENSIBLE-ONLY ERC
An Energy Transfer Wheel without the latent energy
transfer capability of the standard Enthalpy Wheel is
available for dry-climate application (RH less than 30%).
This wheel does not have the Silica Gel coating applied.
M. MERV 11 and 13 AIR FILTERS
All units are shipped with MERV 8 supply and exhaust
TABLE 5 - EXHAUST AIR LEAVING TEMPERATURE AND
ENERGY RECOVERY WHEEL EFFECTIVENESS
EXHAUST AIR TEMPERATURE AND ERW EFFECTIVENESS
ERW EFF
70oF AND 20% RH
INDOORS
70oF AND 30% RH
INDOORS
70oF AND 40% RH
INDOORS
DESIGN
TEMP EAT DESIGN
TEMP EAT DESIGN
TEMP EAT
% FoFoFoFoFoFo
0.80 -13 4.0 -3 12.0 4 17.3
0.70 -15 11.0 -4.5 18.0 3 23.1
0.60 -19 17.0 -8 24.0 1 28.6
0.50 -26 22.0 -13 28.5 -3 33.5
0.45 -31 25.0 -17 31.0 -5 36.2
0.40 -40 26.0 -24 32.5 -10 38.0
Green Building design. All are 2 inch thick, V-pleat design,
Reporting Value determined per ASHRAE 52.2.
N. ELECTRONIC TEMPERATURE CONTROL
SYSTEM
Works in conjunction with optional heating and cooling
coils to temper the supply air back to ambient conditions.
Tempering the air entering the occupied pace allows
Enervent to bring in 100% outside air without putting an
additional load on the rooftop unit. The ETCS can be
entreated with a building automation system.
O. FREE AIR APPLICATION
Operation of the Energy Recovery Wheel can be altered,
sometimes referred to as Start, Stop, Jog, to take
free cooling. This is accomplished by:
from a Primary Temperature Sensor mounted in the air
energy wheel when the outdoor air temperature falls
below the set point; which is factory set at 65°F, but is
also furnished in the outdoor air intake compartment to
less that the Primary sensor. The two sensors together
create a deadband where the ERC will not operate and
free cooling can enter the building unconditioned.
P. GFCI SERVICE OUTLET
installation. Requires separate power source so power
servicing.
Q. EME INTAKE LOUVERS
A fresh air hood consisting of a built-in, louvered, moisture
eliminator requiring no maintenance during the life of the
unit. This contrasts with the standard hood, which contains
The EME intake surface is parallel to front of the unit and
extends outward approximately four inches.
R. VFD BLOWER CONTROL
Variable Frequency Drives (VFD) control the blower
speed. One VFD is provided for each blower (supply and
return), as well as the ERC if Modulating frost Control
is selected.. The VFDs provided are Johnson Controls
DC* line of drives manufactured by Eaton. Refer to the
Drive’s manual included with the ERV for further technical
Refer to the VFD operation manual Chapter 5 for
information on parameters. Most manufactures setpoints
are retained except for :
18 REVT-05ERV
EVT Communications
The unit communication baud rate is set at 38400. The
MAC Address and device instance is set to customer
by connecting to the terminal block labeled Bacnet. It is
connected using an MS/TP network.
EVT Parameters
are separated into 3 categories:
• Hardware Inputs/Outputs:
Hardware Inputs/Outputs are the devices such as
Sensors, Actuators, Relays etc. connected to the
XIV - EVT SEQUENCE OF OPERATION (JCI) Inputs/Outputs of the controller to monitor and control
the unit’s behavior.
• Control Points:
Control points are intended to control the unit’s
behavior. Control points are meant to be overwritten
by the user according to the buildings requirement.
• Monitoring points:
Monitoring points are intended to monitor the unit’s
behavior. Monitoring points are read only points to
inspect the unit’s functionality.
description for each parameter. These parameters can be
accessed through the HMI display or a Bacnet network.
Controller Input/ Output Object Name Description (Hardware IO) Instance Number
FAC 2611
Inputs
IN1 SA-DP AI 10011
IN2 EA-DP AI 10047
IN3 OA-TEMP-REST Outside Air Temperature Resistance AI 25407
IN4 SA-TEMP-REST Supply Air Temperature Resistance AI 25413
IN5 RA-TEMP-REST Return Air Temperature Resistance AI 25410
IN6 EA-TEMP-REST Exhaust Air Temperature Resistance AI 25404
IN7 WHL-FAIL-SIG Wheel Failure Signal BI 10005
IN8 OCC-STS Occupancy Status BI 17564
Outputs
OUT1 SA-FAN-CMD Supply Air Fan Command BO 10017
OUT2 EA-FAN-CMD Exhaust Air Fan Command BO 17525
OUT3 WHL-CMD Wheel Command BO 10023
OUT4 MOH-CMD Outside Air Hood Command BO 15224
OUT5 MEH-CMD Exhaust Air Hood Command BO 17742
OUT6 Spare
OUT7 HTG-CMD Heating Command BO 21240
OUT8 SA-FAN-OUT Supply Fan Output AO 28730
OUT9 EA-FAN-OUT Exhaust Fan Output AO 28746
IOM4711-1
Inputs
IN1 BYP-STS Bypass Damper Status BI 24231
IN2 MOH-STS BI 17503
IN3 MEH-STS BI 17506
IN4 ECON-SIG BI 22410
IN5 SMOKE-ALM Smoke Alarm BI 17573
IN6 AF-STS Air Flow Status BI 21644
IN7 OAFILT-STS Outside Air Filter Status BI 23783
IN8 RAFILT-STS Return Air Filter Status BI 23786
Outputs
OUT1 CLG1-CMD Cooling 1 Command BO 23797
OUT2 CLG2-CMD Cooling 2 Command BO 21249
OUT3 PREHEAT-CMD Pre Heat Command BO 21252
OUT4 BYP-CMD Bypass Damper Command BO 21258
OUT5 HTG1-CMD Heating Stage 1 Command BO 30120
OUT6 HTG2-CMD Heating Stage 2 Command BO 30123
OUT7 Spare
OUT8 HTG-OUT Heating Output AO 21255
OUT9 WHL-OUT Wheel Modulating Signal Output AO 10014
IOM4711-2 Inputs
IN1 RA-CO2 Return Air CO2 AI 10008
IN2 CLG1-SIG Cooling 1 Signal (Y1) BI 24108
IN3 CLG2-SIG Cooling 2 Signal (Y2) BI 24111
IN4 HTG1-SIG Heating 1 Signal (W1) BI 24114
IN5 HTG2-SIG Heating 2 Signal (W2) BI 24117
IN6 Spare
IN7 SA-FAN-STS Supply Air Fan Status BI 17496
IN8 EA-FAN-STS Exhaust Air Fan Status BI 17500
REVT-05ERV 19
Object Name Description (Control Points) Instance Number
SAFLOW-SP-IN Supply Air Flow Set Point Input (For the units with VFD) AV 10188
EAFLOW-SP-IN Exhaust Air Flow Set point Input (For the units with VFD) AV 10091
CO2-SP-IN CO2 Set point Input (For the units with VFD) AV 10185
HTG-SP Heating Set Point (For the units with Gas Heat) AV 21236
PREHEAT-SP Pre Heat Set Point (For the units with Electric Preheat) AV 21238
LA-TEMP-MIN Low Ambient Minimum Temp (For Frost Control) AV 10092
UNIT-EN Unit Enable MV 25746
OCC-MODE Occupancy Mode (For TEC series Thermostat) MV 31996
NOCC-STS Network Occupancy Status (For BAS) BV 32004
HTG-EN Heating Enable Input (From the Thermostat/BAS to turn the GAS heat ON) BV 21829
HTG2-EN Heating 2 Enable (For Bacnet Thermostat/BAS) BV 32024
CLG1-SW-EN Cooling 1 Software Enable (For Bacnet Thermostat/BAS) BV 22415
CLG2-SW-EN Cooling 2 Software Enable (For Bacnet Thermostat/BAS) BV 22416
TUNING-RESET PID Tuning Reset BV 32041
USE-TSTAT-INPUTS Use Thermostat Inputs (For the units with Thermostat Control) BV 31930
USE-CO2-MODE Use CO2 Control Mode Flag BV 10218
USE-SSJ-MODE Use Start Stop Jog Mode Flag BV 10219
USE-LA-MODE Use Low Ambient Mode Flag BV 10216
USE-SMOKE-MODE Use Smoke Control Mode Flag BV 15295
USE-CLG-MODE Use Cooling Mode Flag BV 22433
USE-MOD-HTG Use Modulating Post Heat Mode Flag BV 21261
USE-PREHEAT-MODE Use Pre Heat Mode Flag BV 21263
USE-MOD-WHEEL Use Modulating Wheel Mode Flag BV 22667
USE-FILT-ALM Use Dirty Filter Indication Mode Flag BV 23748
USE-STAGED-HTG Use Staged Post Heat Flag BV 23879
USE-BYPASS-MODE Use Bypass Mode Flag BV 22435
EMG-STANDALONE-HTG Emergency Standalone Heating Mode Flag BV 32050
SSJ-MIN-TEMP Start Stop Jog Min Temperature AV 10186
SSJ-MAX-TEMP Start Stop Jog Max Temperature AV 10187
SSJ-ONTIME Start Stop Jog Wheel On Time AV 10184
SSJ-OFFTIME AV 10183
HTG-MINOFF AV 32052
HTG-MINON Gas Heat Minimum On Time (For 2 stage Gas Heating) AV 32051
WHL-INTERCEPT Wheel Intercept AV 10077
WHL-SLOPE Wheel Slope AV 10090
Object Name Description (Monitoring Points) Instance Number
EA-FLOW AV 10276
SA-FLOW AV 10277
RA-CO2 Return Air CO2 AI 10008
RA-TEMP Return Air Temperature (Calculated value using resistance input) AV 25418
OA-TEMP Outside Air Temperature (Calculated value using resistance input) AV 25417
EA-TEMP Exhaust Air Temperature (Calculated value using resistance input) AV 25416
SA-TEMP Supply Air Temperature (Calculated value using resistance input) AV 25419
SAFLOW-SP Supply Air Flow Set Point (Validated Set point) AV 17734
EAFLOW-SP Exhaust Air Flow Set Point (Validated Set point) AV 17735
CO2-SP CO2 Set Point (Validated Set point) AV 17736
MAX-FLOW AV 14835
MIN-FLOW AV 14836
OCC-STS Occupancy Status (24VAC signal from Thermostat) BI 17564
ECON-SIG BI 22410
AF-STS Air proving Status BI 21644
EA-FAN-STS Exhaust Air Fan Status BI 17500
SA-FAN-STS Supply Air Fan Status BI 17496
MEH-STS BI 17506
MOH-STS BI 17503
BYP-STS Bypass Damper Status BI 24231
20 REVT-05ERV
CLG1-SIG Cooling 1 Signal (Y1 From Thermostat) BI 24108
CLG2-SIG Cooling 2 Signal (Y2 From Thermostat) BI 24111
HTG1-SIG Heating 1 Signal (W1 From Thermostat) BI 24114
HTG2-SIG Heating 2 Signal (W2 From Thermostat) BI 24117
START-UP Start Up Mode Flag BV 17740
SMOKE-MODE Smoke Control Mode Flag BV 10255
LA-MODE Low Ambient Control Mode Flag BV 10252
CO2-MODE CO2 Control Mode Flag BV 10254
PREHEAT-MODE Pre Heat Mode Flag BV 21265
CLG-MODE Cooling Mode Flag BV 22443
HTG-MODE Heating Mode Flag BV 21266
SSJ-MODE Start Stop Jog Mode Flag BV 10257
BYP-MODE Bypass Mode Control Flag BV 22445
SAFAN-FAIL-ALM Supply Air Fan Failure Alarm MV 25178
WHL-FAIL-ALM Wheel Failure Alarm MV 25177
MOH-FAIL-ALM MV 25179
EAFAN-FAIL-ALM Exhaust Air Fan Failure Alarm MV 25180
MEH-FAIL-ALM MV 25176
BYP-FAIL-ALM Bypass Failure Alarm MV 25181
RAFILT-ALM RA Dirty Filter Alarm MV 25479
OAFILT-ALM OA Dirty Filter Alarm MV 25478
SAFLOW-SP-ALM SA Flow Set Point Out Of Range Alarm MV 25595
EAFLOW-SP-ALM EA Flow Set Point Out Of Range Alarm MV 25594
CO2SP-ALM CO2 Set Point Out Of Range Alarm MV 25596
Unit Enable (Standard)
EVT will be operational when "UNIT-EN" (Unit Enable)
of following two methods:
Occupancy signal from Bacnet: This is an option that
is used to gain control over the unit through a Bacnet
network. In order for the unit to operate, the "NOCC-S"
(Network occupancy Status) parameter must be true.
Occupancy signal from Thermostat (24VAC output): The
unit can be operated by supplying a 24VAC signal to the
occupied input in the terminal block labeled as "occ" and
"com". If the Thermostat used is of series TEC3630, then
it will automatically detect the occupancy signal, provided
Device ID: 1625.
If any of the two methods, "NOCC-S" parameter or an
occupancy input signal from thermostat are true the
sequence of operation is as follows:
1. The unit will set the "START-UP" parameter to True,
indicating unit is ready to operate.
2. The unit will turn on the wheel.
3.
air damper.
4.
opened.
5.
the blowers on.
Set Point Validation (Standard)
This mode is responsible for the validations of the user’s
inputted set points. It is important to note that the user’s
inputted set points "SAFLOW-SP-IN", "EAFLOW-SP-
IN" and "CO2-SP-IN" are not the machine’s validated
set points. The user’s inputted set points go through a
validation block that compares the set points to the unit’s
maximum and minimum capabilities. If the inputted set
point is greater than the maximum limit, the validation
block will modify the machine’s set point to the maximum
value of that particular unit. If the inputted set point is
below the machine’s minimum limit, the validation block
will modify the machine’s set point to the minimum value
of that particular unit. "SAFLOW-SP", "EAFLOW-SP" and
"CO2-SP" are validated set points for the EVT.
When the unit detects that the set points are outside the
unit’s range it will set the alarm parameters "SAFLOW-
SP-ALM", "EAFLOW-SP-ALM" and "CO2SP-ALM" to
true.
the user’s inputted set points, the user should check that
the set points are not outside the machine’s operating
range or that the unit is not engaged in a control mode.
Smoke Control Mode (Optional)
Smoke control is a mode that checks for the existence
of smoke on the return air stream. When this mode is
engaged, the unit will:
1. Set the "SMOKE-MODE" parameter to True,
indicating the unit is running on this mode.
2.
3. The unit will set the exhaust air blower speed to 90%
in order to exhaust the smoke out of the system.
4. Once this mode is disengaged the unit will:
a.
b.
blower on. Release exhaust air blower speed to
This manual suits for next models
9
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