ConServ N Series User manual

www.conserv.com 1 7-2020
9h
N Series
Installation and
Operation Manual

www.conserv.com 2 7-2020
ARC FLASH AND ELECTRIC SHOCK HAZARD
Disconnect all electric power supplies, verify with
a voltmeter that electric power is off and wear
protective equipment per NFPA 70E before
working within electric control enclosure. Failure
to comply can cause serious injury or death.
Installer must provide earth ground to unit, per
NEC, CEC, and local codes, as applicable. Before
proceeding with installation, read all instructions,
verifying that all the parts are included and check
the nameplate to be sure the voltage matches
available utility power.
The line side of the disconnect switch contains
live high voltage. The only way to ensure that
there is NO voltage inside the unit is to install and
open a remote disconnect switch and verify that
power is off with a voltmeter. Refer to unit
electrical schematic.
▪This equipment is to be installed by following
Industry Best Practices and all applicable
codes. Any damage to components,
assemblies, sub-assemblies, or the cabinet
which is caused by improper installation
practices will void the warranty.
▪Air ducts connecting this ERV to the
Occupied Space must be installed in
accordance with the Standards of the
National Fire Protection Agency for the
installation of Air-Conditioning and
Ventilating Systems (Standard No. 90A) and
Warm-Air Heating and Air-Conditioning
Systems (Standard No. 90B)
▪This unit is intended for general ventilating
and heating only. Do not use to exhaust
hazardous or explosive materials and
vapors. Do not connect this equipment to
range hoods, fume
hoods or collection systems for toxics.
▪This unit is for operation for ventilating
finished structures only. It is not to be used
until after all construction has been
completed and construction debris and dust
are cleaned from the Occupied Space. For
proper operation, inspect the equipment
filter condition before operation.
▪This manual contains a section for
maintaining written records of unit
maintenance and/ or repairs. Refer to the
Maintenance Section. At the time the ERV is
commissioned, the user should develop a
maintenance schedule to incorporate
monthly and seasonal maintenance and
include start-up maintenance tasks as
described in this manual.
RISK OF ELECTRIC SHOCK OR EQUIPMENT
DAMAGE
Whenever electrical wiring is installed,
disconnected, or changed, the power supply to
the ERV and its controls must be disconnected.
Use established Lock Out and Tag Out
procedure, disconnect power, and lock out
power source to prevent accidental reconnection
of electric power.
RISK OF CONTACT WITH HIGH-SPEED
MOVING PARTS
Disconnect all local and remote power supplies,
verify with a voltmeter that electric power is
removed, and all fan blades have stopped
rotating before working on the unit. Do not
operate this unit with any cabinet panels
removed.

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THE ConsERV™ N SERIES PRODUCT LINE
Four models of ConsERV™ systems are available to cover a range from 200 to 4250 CFM (three phase
models have additional flow capability). Each model is a distinct physical size and can be outfitted with C750A
ConsERV™ cores to provide the appropriate performance. Each of these systems can be configured for use
indoors or outdoors and for vertical or horizontal return and supply air streams.
EXAMPLE: A system with the product code N3XVVB-ACBBAA-AC would have three (3) C750A ConsERV™
cores, be suitable for exterior (rooftop) use, supplied in a vertical configuration where the return and supply air
openings are on the bottom for mating with a roof curb (supplied by others or selected as an Option), and
would have an electrical system suitable for operation with medium voltage (208 VAC) three phase power.
Extra cost options installed at the factory would include motorized dampers on the fresh and exhaust air
streams; differential pressure switches triggered by excessive static pressure differential across either bank of
filters; and an internally mounted PLC with the ability to relay unit status back to a building management system
via BACnet while sending the fan speed control voltage requested via BACnet to the onboard blowers.
NOTE: Dais Corporation reserves the right to make changes to the design or specifications of its products at any
time without notice.
* See electrical data sheet for options
** N1 Cabinets only
† 15,000 hour salt spray corrosion
resistance
‒
Series
Name:
N
N
‒
Number of
Cores:
1 - 4
Location:
N = Interior
X = Exterior
C: Ceiling**
Return Air
Flow Direction:
H = Horizontal
V = Vertical
Supply
Voltage:
A = 200 - 277 V / 1 Ø
B = 208 - 230 V / 3
Ø
C = 460 V / 3 Ø
D = Other
Options:
See codes below
Supply Air
Flow Direction:
H = Horizontal
V = Vertical
Motors*:
A = 2 Motors
B = 3 Motors
C = 4 Motors
D = 2 Motors, 480V High Static
Coating:
A = G90 Galvanized
B = Powder Coat
C = Extended Life Coating†
D = Powder Coat + Extended Life Coating†
Exhaust
Dampers:
A = Class 1
B = Class 2
C = None
Outside
Air Filter:
A = MERV 8 Pleated Filter
B = MERV 13 Pleated Filter
Option Codes:
A = Filter pressure differential switches
B = Double wall construction
C = BACnet enabled PLC
D = Flow monitoring
E = Temperature sensors (up to 4 quadrants)
F = T/RH sensors (up to 4 quadrants)
G = CO
₂Monitoring
H = Fused disconnects
I = Extra filters
J = Sloped roof
K = 575 V / 3Ø transformer
L = Digital time clock
M = Defrost control
N = Economizer
O = CO
₂ Control
P = 14” Knockdown Curb
Q = Foam Insulation
R = Additional options (contact factory)
Outside
Dampers:
A = Class 1
B = Class 2
C = None
Exhaust
Air Filter:
A = MERV 8 Pleated Filter
B = MERV 13 Pleated Filter

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ConsERV™ ENERGY RECOVERY VENTILATION SYSTEM SPECIFICATIONS:
Energy recovery ventilation units shall be factory assembled, wired and tested prior to shipment. Units shall be constructed
and assembled to UL 1812 and inspected by an approved NRTL. Field wiring shall require a single point power connection
and a numbered terminal strip for low voltage remote wiring connections.
UNIT CONSTRUCTION
Unit construction for indoor or outdoor applications, with all seams sealed with weather-resistant sealant. The interior
cabinet surfaces shall be lined with 1” thick fiberglass insulation board with a foil face. The base rail for exterior/rooftop
units shall be constructed with heavy gauge galvanized steel with integral supports. Perimeter base frame designed to be
such that it overhangs when mounted on a roof curb
CONSERV ENERGY RECOVERY VENTILATOR CORES
The energy recovery cores shall be made with Aqualyte™, a moisture transfer membrane. The moisture transfer membrane
shall be made of polymeric materials without using paper products and shall form a positive barrier between air streams
without pores or holes communicating between the air streams. The membrane shall be selectively permeable to water
molecules while substantially eliminating the permeation of nitrogen, oxygen, carbon dioxide, and other components of dry
air. The housing of the energy recovery cores shall be constructed of a galvanized sheet metal (G60 rated) or equivalent
material capable of protecting the energy transfer core and preventing corrosion. The crossflow energy flow separation
layers are thermoformed corrugated plastic spacers that provide support and separation to the membrane layers.
The ConsERV™ core shall be tested and certified by the Air-Conditioning, Heating and Refrigeration Institute (AHRI) to AHRI
Standard 1060. At the nominal certified CFM, the ConsERV™ core shall provide at least 60% total effectiveness for both
heating and cooling conditions and 0% exhaust air transfer ratio (EATR) when tested at AHRI differential pressure between
airstreams. These values are to be produced from official AHRI certification data. Verification may be obtained via the
www.ahri.org website, which is made available to the public by AHRI, to ensure proper comparison of air-to-air energy
recovery products.
FANS
Supply and exhaust fans shall be motorized impellers with electronically commutated (EC) motors and backward-inclined
aluminum blades. Motor speed is adjustable via external potentiometers or voltage sources that provide a variable 0 –10
VDC signal to the EC motor.
FILTERS
The entering Outside Air and entering exhausting air side of the enthalpy cores have a 2" deep MERV-8 medium efficiency
pleated throwaway type filters.
OUTDOOR UNITS
Outdoor units shall be provided with a factory installed fresh air inlet and exhaust hoods. Hoods are constructed with
minimum 20-gauge coated steel with the same finish as the unit. Fresh air inlet hoods are complete with galvanized steel
wire mesh on the entering air side of the filter that doubles as a bird screen. Exhaust hoods are complete with a similar
galvanized steel wire mesh screen. All flanges that meet the unit shall be sealed with caulking.
FRESH AIR MOTORIZED INLET DAMPER
Units shall be completed with a factory installed and wired two-position, gear-driven motorized damper on the fresh air
inlet. The damper motor shall be spring return, 24 V powered, and complete with an internal circuit to ensure fan activation
when damper is fully open. Outdoor applications will mount the damper assembly within the fresh air hood, while indoor
applications will require the damper assembly to be mounted within a sleeve.
EXHAUST AIR MOTORIZED DISCHARGE DAMPER
Units shall be completed with a factory installed and wired two-position, gear-driven motorized damper on the exhaust air
discharge. The damper motor shall be spring return, 24 V powered, and complete with an internal circuit to ensure fan
activation when damper is fully open. Outdoor applications will mount the damper assembly within the exhaust air hood,
while indoor applications will require the damper assembly to be mounted within a sleeve.
FILTER PRESSURE DIFFERENTIAL SWITCHES
Units shall be complete with two (2) factory-installed and wired differential pressure switches. One switch will measure the

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differential pressure at the inlet and exit of the Outside Air filter bank, while the other switch will measure the differential
pressure at the inlet and exit of the Return Air filter bank. The customer shall have the ability to adjust the activation point
of the switches to match a desired maximum pressure drop for the filters at each location. Switches shall be SPDT and
rated for 115 –277 VAC with 300 VA pilot duty and 15 A noninductive load ratings.
MERV-13 PLEATED FILTERS
Units shall be supplied with disposable, 2” thick pleated filters that are rated MERV-13 instead of the standard MERV-8
pleated filters.
DOUBLE WALLS
Units shall be complete with a factory installed internal liner constructed from 24-gauge galvanized steel to cover all interior
insulation surfaces.
BACnet CONTROLLER
Unit shall be provided with an internally mounted controller that connects to a building management system via the BACnet
MS/TP protocol. At a minimum, the controller replaces the standard manual control of blower rpm via external
potentiometer or voltage source and allows the blower rpm to be set directly on the controller or remotely via BACnet.
Internal feedback control of blower speed to vary automatically in response to sensor settings is not included in this option.
The controller will connect to any sensors installed in the unit and relay their information to the building management
system via BACnet.
ONBOARD FLOW MONITORING & CONTROL
Unit shall be provided with an internally mounted controller that connects to a building management system via the BACnet
MS/TP protocol. At a minimum, the controller replaces the standard manual control of blower rpm via external
potentiometer or voltage source and allows the blower rpm to be set directly on the controller or remotely via BACnet.
Onboard sensor measurements will be used by the controller to calculate air flow rates and vary the blower speed control
voltages to maintain a desired flow rate as conditions change. The controller will also connect to any sensors installed in
the unit and relay their information to the building management system via BACnet.
TEMPERATURE SENSORS (PER QUADRANT)
Please order a BACnet controller as an additional option when requesting this option. A temperature probe will be mounted
in each specified quadrant and connected to the BACnet controller, which will make its data available to the BMS.
TEMPERATURE/RELATIVE HUMIDITY SENSORS (PER QUADRANT)
Please order a BACnet controller as an additional option when requesting this option. Measurements of temperature and
humidity will be performed in each specified quadrant and reported to the BACnet controller, which will make its data
available to the BMS.
STANDARD PROTECTIVE CABINET COATING
All sheet metal will be fabricated with a G90 galvanized coating. All parts exposed to the exterior of the unit will be factory-
coated with a gray, weather-resistant coating for enhanced protection vs. the galvanized coating. The protective coating
shall be rated to a minimum of 1000 hours of life in ASTM B117 testing.
ENHANCED PROTECTIVE CABINET COATING
All sheet metal will be fabricated with a G90 galvanized coating. All parts exposed to the exterior of the unit will be factory-
coated with a weather-resistant coating for enhanced protection vs. the galvanized coating. The protective coating shall
be rated to a minimum of 2500 hours of life in ASTM B117 testing. Custom coating coloration will also be available with
this option.
FUSED DISCONNECTS
All systems include a non-fused disconnect switch as standard. With this option, appropriately sized fuses shall be installed
inside the system on the incoming power circuit.
ADDITIONAL FILTERS
Units shall be supplied with additional filters that are shipped with the unit for later installation. These filters shall be
disposable, 2” thick pleated filters that are rated MERV-8 or MERV-13 according to which rating is used in the system.

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SLOPED ROOF
Rooftop units will be supplied with a continuous roof membrane over a level, horizontal sheet metal roof surface as standard
equipment. This option adds additional hardware to slope the roof away from the side with the primary access panel. A
continuous roof membrane of the same construction as the standard equipment shall then be mounted over the sloped
roof to prevent liquid intrusion into the system.
ConsERV™ SYSTEM SUMMARY
Models
C750
Cores
CFM Range
Total
Filters*
Total
Fans
Supply VAC /
Phase**
Unit
Power†
MCA / MOP
N1NH
N1XH
N1XV
1
200 –1000
2
2
200 - 277 / 1
200 - 240 / 3
380 - 480 / 3
2.0 kW
3.8 kW
5.2 kW
12 / 15
13 / 15
8 / 15
N2NH
N2XH
N2XV
2
400 –2300
4
2
200 - 277 / 1
200 - 240 / 3
380 - 480 / 3
2.0 kW
3.8 kW
5.2 kW
12 / 15
13 / 15
8 / 15
N3NH
N3XH
N3XV
3
600 –3200
6
2
200 - 277 / 1
200 - 240 / 3
380 - 480 / 3
380 - 480 / 3††
2.0 kW
3.8 kW
5.2 kW
7.6 kW††
12 / 15
13 / 15
8 / 15
11 / 15††
N4NH
N4XH
N4XV
4
600 –3500
8
2
200 - 277 / 1
200 - 240 / 3
380 - 480 / 3
2.0 kW
3.8 kW
5.2 kW
12 / 15
13 / 15
8 / 15
N4NH
N4XH
N4XV
4
800 –4250
8
3
200 - 277 / 1
200 - 240 / 3
380 - 480 / 3
3.0 kW
5.7 kW
7.8 kW
18 / 25
20 / 25
12 / 25
N4NH
N4XH
N4XV
4
800 –4250
8
4
200 - 277 / 1
200 - 240 / 3
380 - 480 / 3
4.0 kW
7.4 kW
10.2 kW
24 / 25
25 / 30
18 / 20
* Filters are 20” x 20” x 2” thick pleated MERV 8 by default. 2” thick MERV 13 pleated filters are available as an option.
** Each configuration (NH, XH, and XV) is available with any of the electrical power combinations in the sixth column.
†This table shows the faceplate power rating for the system as a whole. Standard electronically commutated (EC) motors
allow efficient speed control of each fan, meaning that actual power draw can and usually will be much lower than the
faceplate maximums listed.
†† N3 High Static variant uses higher power impellers.

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FAN SELECTIONS
Maximum External Static Pressure (ESP) capability shown. Fan speed is continuously variable and can be reduced to
operate in areas below and to the left of the curves shown.
Single phase fans (200 –277 V / 1 Ø / 60 Hz)
Three phase fans (200 –240 V / 3 Ø / 60 Hz)

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Three phase fans (380 –460 V / 3 Ø / 60 Hz)
RIGGING AND UNIT PLACEMENT
▪Inspect the unit for transportation damage. File any claim with transportation agency promptly.
▪Do not drop unit, keep upright. Use spreader bars over the unit to prevent sling or cable damage (see below).
Ensure the spreader bars extend past the outside of the unit to reduce uneven loading to door panels.
▪For roof mounted installations, place unit on the installed roof curb. Assure unit is placed in the proper orientation
on the roof curb so that the supply and return sections are properly oriented.
Suggested rigging for indoor units
Suggested rigging for outdoor/rooftop units

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ConsERV™C750A Core Specifications
Dimensions:
21.75” x 21.75” x 19.5”
(552 x 552 x 495 mm)
Weight:
50 lb (22.7 kg)
Performance Certification:
AHRI 1060
Safety Certification:
ETL Listed to the UL 900
standard
Warranty:
Limited 10 year
NOTE: Dais Corporation reserves the right to make changes to the design or specifications of its products at any time without notice.

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IMAGES ARE NOT TO SCALE –ALL DIMENSIONS ARE INCHES, ALL WEIGHTS ARE LB
DIMENSIONS
N1NH
N2NH
N3NH
N4NH
A*
59.3
59.3
59.3
59.3
B
21.8
41.3
60.8
80.4
C
56.3
56.3
56.3
56.3
D
34.9
34.9
34.9
34.9
E
12.0
24.0
36.0
48.0
F
13.0
13.0
13.0
13.0
WEIGHT
330
480
630
780
* ADD 3.5 FOR EACH OPTIONAL MOTORIZED DAMPER THAT IS INSTALLED ON THE UNIT.
NOTE: Dais Corporation reserves the right to make changes to the design or specifications of its products at any time without notice.
N SERIES INDOOR UNIT
N2NH SYSTEM
SHOWN
FILTER AND CORE
ACCESS PANEL
BLOWER
ACCESS
EA
OA
RA
SA
ELECTRICAL/CONTROL PANEL
CONNECTIONS AND ACCESS

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IMAGES ARE NOT TO SCALE –ALL DIMENSIONS ARE INCHES, ALL WEIGHTS ARE LB
DIMENSIONS
N1XH
N1XV
N2XH
N2XV
N3XH
N3XV
N4XH
N4XV
A
23.1
42.6
62.1
81.6
B*
110.7
110.7
110.7
110.7
C
59.9
59.9
59.9
59.9
D
38.9
38.9
38.9
38.9
E*
26.5
26.5
26.5
26.5
F*
17.8
17.8
17.8
17.8
G
12.0
24.0
36.0
48.0
H
13.0
13.0
13.0
13.0
I
21.8
41.3
60.8
80.4
J
56.3
56.3
56.3
56.3
WEIGHT
350
500
650
800
* ADD 3.5 FOR EACH OPTIONAL MOTORIZED DAMPER THAT IS INSTALLED ON THE UNIT
NOTE: Dais Corporation reserves the right to make changes to the design or specifications of its products at any time without notice.
N SERIES EXTERIOR UNIT
FILTER AND CORE
ACCESS PANEL
N2XV SYSTEM
SHOWN
BLOWER
ACCESS
BLANK PANEL, FIELD SELECTABLE FOR
VERTICAL OR HORIZONTAL ORIENTATION
OUTSIDE
AIR HOOD
EXHAUST
AIR HOOD
ELECTRICAL/CONTROL PANEL
CONNECTIONS AND ACCESS
J
I

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OPTIONAL SPLIT ACCESS PANEL
(Available on N1NH model)
DETAIL A
N1NH SYSTEM SHOWN WITH SPLIT ACCESS PANEL
CORE
ACCESS
PANEL
(SCREWS)
BLOWER
ACCESS
PANEL
(SCREWS)
EA
OA
RA
SA
ELECTRICAL/CONTROL PANEL
CONNECTIONS AND ACCESS
FILTER
ACCESS
PANEL
(HINGED)
IMAGES ARE NOT TO SCALE
ALL DIMENSIONS ARE INCHES
APPROXIMATE WEIGHT = 620 LB
ALLOWS SYSTEM TO BE MOUNTED
AGAINST A CEILING WITH ACCESS
PANELS ON THE BOTTOM

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IMAGES ARE NOT TO SCALE –ALL DIMENSIONS ARE INCHES, ALL WEIGHTS ARE LB
DIMENSIONS
N1XH
N1XV
N2XH
N2XV
N3XH
N3XV
N4XH
N4XV
A
57.7
57.7
57.7
57.7
B
18.3
37.6
57.1
76.7
C
14
33.4
53.0
72.6
D
53.6
53.6
53.6
53.6
E
56.9
56.9
56.9
56.9
F
17.5
36.8
56.4
76.0
G
14
14
14
14
Duct Support
*Not Available
26.5 x 2 x 1.5
WEIGHT
60
80
100
120
Roof curbs shall be knock down construction with minimum 18-gauge galvanized steel; 14" high with perimeter wood
nailer, and corner clips to facilitate field assembly. Duct supports can be positioned at user’s discretion to match
ductwork. Supports and corner braces are not required for N1 units due to compact size. Adhesive backed foam gasket
seal shall be provided loose for field installation to act as a seal between the unit and the roof curb.
NOTE: Dais Corporation reserves the right to make changes to the design or specifications of its products at any time without notice.
*FIELD-INSTALLED
DUCT SUPPORTS
A
DETAIL A
1.
INSERT TABS INTO SLOTS
2. BEND TABS FLAT TO SECURE
3.
INSTALL BRACES TO KEEP
CORNERS SQUARE (NOT
AVAILABLE IN N1 UNITS)
KNOCKDOWN ROOF CURBS

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THE MINIMUM CLEARANCE SHOWN BELOW MUST BE MAINTAINED
FOR ACCESS AND REMOVAL OF INTERNAL COMPONENTS.
THE FRESH AIR INLET SHOULD BE AWAY FROM SOURCES OF CONTAMINANTS
SUCH AS DISCHARGE AIR FROM OTHER VENTILATION UNITS.
TOP VIEW OF AN N2XV SYSTEM SHOWN, BUT DIMENSIONS ARE
REPRESENTATIVE OF THE ENTIRE PRODUCT LINE.
36”
36”
SECONDARY
CORE, FILTER, AND BLOWER ACCESS
(PRIMARILY FOR N3 AND LARGER SYSTEMS)
36”
SERVICE CLEARANCES
CORE AND FILTER ACCESS
BLOWER ACCESS
ELECTRICAL
ACCESS

15
ConsERV™ SYSTEM CONNECTIONS
Power and control connections to the ConsERV system are made at the bottom corner of unit where the disconnect
switch and control cabinet are located:
▪Power and control connection holes are sized for ½” conduit.
▪Fan speed controls allow continuous adjustment of fan rpm.
Power Wiring Hole
Control Wiring Knockout
Disconnect Switch
Upper Fan Speed Control
Lower Fan Speed Control
Internal Control Panel
Shown with dedicated
access cover removed.
Switch and
controls shown
with protective
cover removed.

16
Wiring:
ARC FLASH AND ELECTRIC SHOCK HAZARD
Disconnect all electric power supplies, verify with a
voltmeter that electric power is off and wear
protective equipment per NFPA 70E before
working within electric control enclosure. Failure to
comply can cause serious injury or death.
Installer must provide earth ground to unit, per
NEC, CEC, and local codes, as applicable. Before
proceeding with installation, read all instructions,
verifying that all the parts are included and check
the nameplate to be sure the voltage matches
available utility power.
The line side of the disconnect switch contains live
high voltage. The only way to ensure that there is
NO voltage inside the unit is to install and open a
remote disconnect switch and verify that power is
off with a voltmeter. Refer to unit electrical
schematic
1. Remove the access plate on the side of the N
series enclosure.
2. If adding interface wiring for BacNet PLC
system, remove the knockout below the wiring
access hole. If not adding wires, seal knockout
with silicone.
3. Route the power wires through the access hole
above the switch box.
4. Connect the ground wire to the green DIN
connector terminal at the top of the enclosure.
5. The power wires are connected to the non-fused
connector switch.
Loosen the
locking nut on
the side of the
switch box.
Then rotate
the box cover
back to
access the
power switch
and speed
controls
Route power
wiring through
7/8” hole
If adding wiring
for building
system wiring,
remove knockout.
If not adding
wiring seal with
silicone caulk
Remove access
plate to access
the system
controls
Connect Ground
to ground
connector
Connect input power to
non-fused switch

17
System operation:
1. Loosen the locking nut on the side of the
switch box. Then rotate the box cover back
to access the power switch and speed
controls.
2. The N Series comes with a potentiometer as
the standard speed control. The optional
control is a digital 0-10vdc voltage source
control.
3. If the N series unit is equipped with a BacNet
PLC control, the switch above the PLC must
be in the ON position for the system to
operate.
4. The speed controls are setup for minimum
fan speed. So the system air flow will need
to be adjusted during the setup and balance
of the system.
Note:
1. The 0-10vdc speed control allows you to
view the control voltage running the fan. The
standard potentiometer does not allow this
directly.
2. If using a BacNet PLC, the EPROM will save
the final speed setting by cutting or removing
the jumper wire between the digital input
connections DI3 and DI4.
Power switch
Potentiometer
speed control
0-10 vdc
speed
control
If the system is
equipped with a
BacNet PLC,the
switch above the
PLC must be in
the on position
for the system to
operate
The EPROM will
save the final
speed setting by
cutting or removing
the jumper wire
between the digital
input connections
DI3 and DI4

18
Wiring Diagrams
2 Fans, 1Ph, Potentiometers, Dampers

19
2 Fans, 3Ph, Potentiometers, Dampers

20
4 Fans, 1Ph, Potentiometers, Dampers