Honeywell CENTRA LINE MERLIN N Series User manual

® U.S. Registered Trademark
Copyright © 2021 Honeywell Inc. • All Rights Reserved
EN1Z-1076GE51 R1021
MERLIN NX
IP AND MS/TP VAV CONTROLLER INSTALLATION
INSTRUCTIONS
General ............................................................................. 2
Trademark Information .................................................. 2
Product Description ....................................................... 2
Network Security .............................................................. 3
General Safety Instructions ............................................ 3
Specifications ................................................................... 4
Electrical ....................................................................... 4
Hardware ...................................................................... 4
Communication ............................................................. 4
Airflow Sensor ...............................................................4
Integrator Actuator ........................................................ 4
Operational Environment ..............................................4
Sylk™ Devices Supported ............................................ 4
UIO (Configurable as analog output or universal input) 4
Solid State Relay .......................................................... 5
Standards and Compliances ......................................... 5
Wireless Connectivity .................................................... 5
Interface ............................................................................ 5
IP Variant ...................................................................... 5
MS/TP Variant ............................................................... 6
Internal Wiring .................................................................. 6
Controller Terminals ...................................................... 7
Mounting ...........................................................................8
Before Mounting Actuator onto the Damper Shaft ........ 8
Mounting Actuator onto Damper Shaft .......................... 9
Differential Pressure Sensor ......................................... 10
Airflow Sensor Replacement ......................................... 11
Wiring ................................................................................12
Power supply ....................................................................14
General Information ...................................................... 14
Power Wiring ................................................................. 14
Communication ................................................................ 17
BACnet MS/TP VARIANT ................................................. 17
Antenna ........................................................................ 19
Sylk Bus™ ........................................................................ 20
Modbus ............................................................................. 21
Wiring Topology ............................................................ 21
Modbus Master Specifications ...................................... 21
BACnet IP .......................................................................... 23
Connecting to a IP network ........................................... 23
Static IP Configuration .................................................. 23
Network Topologies ...................................................... 23
Commissioning ................................................................ 24
Automatic MAC Addressing .......................................... 24
Service Button .............................................................. 25
Operator interface LEDs ............................................... 26
Regulatory Information .................................................... 27
FCC Regulation ............................................................ 27
Canadian Regulatory Statement ................................... 27
Approvals and Certifications ......................................... 28
Appendix ........................................................................... 29
Sensor Input Accuracy .................................................. 29
Recognition of Sensor Failure of Sensor Inputs ........... 29
Sensor Characteristics .................................................... 29
PT1000 ......................................................................... 30
PT3000 ......................................................................... 33
NTC10K TYPE II ........................................................... 33
NTC10K TYPE III .......................................................... 34
PT100 ........................................................................... 34
JOHNSON A99 ............................................................. 35
NTC20K ........................................................................ 35
10K3A1 ......................................................................... 37
Nickel Class B DIN 43760 sensors ............................... 38
NI1000TK5000 .............................................................. 39
Related Technical Literature ........................................... 40

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 2
GENERAL
Trademark Information
Sylk™ is a trademark of Honeywell International Inc.
BACnet® is a registered trademark of ASHRAE Inc
Product Description
The CLMEVAxxxx24NM IP and MSTP VAV controller with
integrated actuator and air flow sensor are a part of the
MERLIN NX family.
The MERLIN NX family of room controllers offers
performance-based engineering with ARENA NX (Niagara
eXtended) and enables Single-Tool-Engineering throughout
the whole Building Management System and allowing cost-
effective installation and commissioning and driving new
levels of functionality and efficiency in today's buildings.
These scalable and freely programmable BACnet/IP and
BACnet MS/TP based unitary controllers utilize smart
engineering and commissioning tools. It supports multiple
flexible configurations to address specific applications with
ARENA NX (Niagara) tool, Modbus, and Sylk™ bus sub-
bus integration options.
Fig. 1. Controller Part Numbers Description
Table 1. ordering part number
Part Number UIO SSR Sum IO Backbone Comm. DIP switch BLE integrated
CLMEVA75I24NM 7 5 12 IP No No
CLMEVA00IB24NM 0 0 0 IP No Yes
CLMEVA75IB24NM 7 5 12 IP No Yes
CLMEVA75M24NM 7 5 12 MS/TP Yes No
CLMEVA00MB24NM 0 0 0 MS/TP Yes Yes
CLMEVA75MB24NM 7 5 12 MS/TP Yes Yes
Table 2. Replacement Parts
Part Number Comments
SDPPF500PA Spare part used in case, original air flow sensor gets damaged.
Table 3. Mobile Application
Honeywell Connect Mobile
application
Honeywell Connect Mobile application for the VAV balancing can be downloaded from the Google
Play Store / Apple App store.
CLME V
Modbus
Master
VAV
Integrated Actuator
Brand Identifier
A 7 5 IB 24 N M
Universal Inputs
Digital Outputs (SSR)
Niagara
Power Supply
BLE
I - IP
M - MS/ TP

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
3 EN1Z-1076GE51 R1021
DIMENSION
Fig. 2. Dimensions
NETWORK SECURITY
WARNING
CentraLine hereby expressly states that the MERLIN
NX IP and MSTP VAV controllers are not inherently
protected against cyber-attacks from the Internet and
that, it is therefore intended solely for use in private,
protected networks.
Unprotected Internet connections can expose the MERLIN
NX IP and MSTP VAV controller to cyber-attacks from third-
parties who can then damage it and connected facility
components or cause them to malfunction, or who can
misuse it for illegal purposes for which the operator may
then be held liable. When directly connected to the Internet,
the MERLIN NX IP and MSTP VAV controllers
automatically becomes a potential target for cyber-attacks.
To ensure safe and reliable operation take necessary
protective measures. If it is not necessary for the MERLIN
NX IP and MSTP VAV controllers to be accessible from the
Internet, it should be isolated from the Internet via a suitable
firewall.
If it is necessary for the MERLIN NX IP and MSTP VAV
controllers to be accessible from the Internet (e.g., to
perform a remote maintenance), the use of a coded VPN
connection is indispensable. Suitable VPN routers are
available from numerous third-party manufacturers in a
wide variety of designs, for operation at 230 V or 24 V.
GENERAL SAFETY INSTRUCTIONS
While performing any work (installation, mounting, startup),
follow all instructions given by the manufacturer and the
safety instructions provided in this document.
— The MERLIN NX IP and MSTP VAV controllers must be
installed and mounted by authorized and trained personnel.
— If the unit is modified in any way, except by the
manufacturer, all warranties concerning operation and
safety become invalid.
— Make sure that applicable local standards and
regulations are always observed.
— Use only CentraLine supplied or approved accessories.
— Before dismantling the system, disconnect the power
supply by either removing the power terminal block from the
controller or by means of local isolation. Read the following
caution note carefully.
197 mm
7 3/4”
3 1/2”
90 mm
3 1/2”
92 mm
124 mm
4 3/4”
147 mm
5 3/4”
175 mm
7”
187 mm
7 1/4”
154 mm
6”
66 mm
2 1/2”
2”
52 mm
All dimensions in mm and inch

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 4
CAUTION
CAUTION
Disconnect the power supply before installing the
MERLIN NX IP and MSTP VAV controllers. Do not
reconnect the power supply until you have completed
the installation.
Switch off the power before you plug / un-plug the
jumper.
SPECIFICATIONS
Electrical
Voltage Range: 20-30 VAC; Class 2 transformer
Nominal Power Consumption:
—IP variant: 8VA; Controller and actuator load (nothing
connected to IO's and COM)
—MSTP variant: 6VA; Controller and actuator load (nothing
connected to IO's and COM)
Full Load Power Consumption:
—IP variant: 30VA; Maximum load including external loads
(including SYLK™, communication, BLE, UIO output,
20V output)
—MSTP variant: 22VA; Maximum load including external
loads (including SYLK™, communication, BLE, UIO
output, 20V output)
— If SSR is used, it should consider real VA needed.
Frequency Range: 50 to 60Hz
Auxiliary Output: 20 VDC @ 75 mA
Hardware
CPU: Crossover processor NXP I.MRT, Cortex M7
Memory Capacity: 16MB QSPI Flash, 16MB SDRAM
Ethernet: 2 X RJ-45 Ethernet ports with integrated fail-
safe for daisy-chaining for IP variants.
Real Time Clock: 24-hr backup after power failure.
The controller includes a supercapacitor to power the built-
in real time clock for 24 hours. In case of power failure, the
super capacitor retains the time set in controller for 24
hours. After 24 hours, the time will reset to default factory
time until user perform BACnet Time Sync.
Communication
The controller is available either with BACnet IP or BACnet
MSTP as a backbone bus.
— Modbus RTU (Modbus Master only)
— Sylk™ Bus: 2-wire, polarity-insensitive
— Optional Bluetooth: BLE for using mobile balancing
application
BACnet IP (IP variants):
—Addressing: Dynamic: DHCP and LinkLocal, Static
—Connection Speed: 10/100 Mbps
Airflow Sensor
Range: ±2.0 in. H2O (±500 Pa)
Accuracy: ±3% of full range
Dimension (LXWXH): 175 X 154 X 90 mm (7 X 6 X 3 1/2
inch)
Weight: 1.5 Kg
Integrator Actuator
Torque: 44 in-lbs (5 Nm)
Run Time: Floating 108 s at 50 Hz; Floating 90 s at 60 Hz
Mounting Shaft: Round 5/16 – 5/8 in (8- 16 mm); Square 1/4
– 1/2 in (6-13 mm)
Shaft Length: ≥ 1 5/8 in (41 mm).
Operational Environment
Storage: -40 °C to 66 °C (-40 °F to 150 °F)
Operation: 0 °C to 50 °C (32 °F to 122 °F)
Humidity: 5% to 95% RH., non-condensing
protection: IP20, NEMA -1
Pollution: Level 2
Sylk™ Devices Supported
Wall Modules Sensors: CLCMTR40, CLCMTR40-H,
CLCMTR40-H-CO2, CLCMTR40-CO2, CLCMTR42,
CLCMTR42-H, CLCMTR42-H-CO2, CLCMTR42-CO2,
CLCMTR71-H, CLCMTR120 (TR75E) and CLCMTR120-H
(TR75-HE)
UIO (Configurable as analog output or
universal input)
AO
— 0(2)…10V direct/reverse with -3mA …+20mA (nega-
tive current needed for light dimming)
— Current output with 0(4)…20mA
UI
— 0(2) to 10V direct/reverse or 0(4) to 20 mA input
—Sensors: NTC10k(Type 2), NTC10K3, 10K3A1,
NTC20k, PT100, PT1000, NI1000TK5000, NI1000
Class B DIN43760, PT3000, JOHNSON A99, 100
Ohm to 100k Ohm resistive (custom characteristic)
— Hardwired wall modules: set point, fan speed, occu-
pancy override
— Dry contact binary input with direct/reverse
— Counter (S0) with 100Hz (min. pulse width 5 ms; e.g.
used to measure fan speed)
— Internal use of UIO 1: resistive input for position
potentiometer providing a 0 to 100% linear position
signal
— Parameters: Resistive value for 0% and resistive
value for 100%; direct/reverse

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
5 EN1Z-1076GE51 R1021
Common terminal shared by 2 UIO, protected against
24VAC mis-wiring and short circuit
Solid State Relay
SSR does switch supply voltage, works with AC and DC,
however in case of DC no support of synchronous motor.
— 1.5A constant; 3.5A inrush for 0.1 sec per SSR out-
put
— Optional bridge between 24 VAC supply and SSR
input shared by all SSRs
Standards and Compliances
CE, UL916 Energy Management Equipment, UL60730,
FCC Part 15; Class A verified, EN 55022; Class A, EN
61000-3-2, 61000
Wireless Connectivity
INTERFACE
IP Variant
Table 4. Connectivity Frequency Range
Connectivity Medium Frequency range E.I.R.P for CE E.I.R.P for FCC/IC
Bluetooth 2400 MHz- 2483.5 MHz 20 mW 20 mW
DECLUTCH BUTTON
RS485 MODBUS
RTU
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MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 6
MS/TP Variant
INTERNAL WIRING
Fig. 3. Internal Wiring
DECLUTCH BUTTON
RS485 MODBUS
RTU
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NOTE: For BACnet MS/TP variant, terminal 34 (COM), is internally connected to C (connections in green above)
and COM terminals (connections in blue above).

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
7 EN1Z-1076GE51 R1021
Controller Terminals
All the terminals for this controller are removable.
Table 5. Controller Terminals
Type Legend Printing Description
Power
1 Earth Ground (Connected to power earth ground)
2 V0 Ground
3 ~ Power supply voltage (Connected to 24VAC~)
4 AC OUT 24VAC~ output
5 SR IN SSR POWER input (Connected to terminal 4 (AC OUT) by a jumper wire)
SSR
6 SR1 SSR1 output (if SSR1 is on this pin should be 24VAC~)
7 C Ground
8 SR2 SSR2 output (if SSR2 is on this pin should be 24VAC~)
9 SR3 SSR3 output (if SSR3 is on this pin should be 24VAC~)
10 C Ground
11 SR4 SSR4 output (if SSR4 is on this pin should be 24VAC~)
12 SR5 SSR5 output (if SSR5 is on this pin should be 24VAC~)
13 C Ground
SYLK 14 WM1 Interface for Sylk™ bus
15 WM2 Interface for Sylk™ bus
RS
485
16 + RS 485 Modbus interface
17 - RS 485 Modbus interface
18 COM Ground
UIO
19 IO1 Universal signal input/output1 (Input<"0-20mA" "0-10V" "NTC10K" NTC20K" "RTD" >; Output<"0-
10V" "0-20mA">
20 C Ground
21 IO2 Universal signal input/output2 (Input<"0-20mA" "0-10V" "NTC10K" NTC20K" "RTD" >; Output<"0-
10V" "0-20mA">
22 IO3 Universal signal input/output3 (Input<"0-20mA" "0-10V" "NTC10K" NTC20K" "RTD" >; Output<"0-
10V" "0-20mA">
23 C Ground
24 IO4 Universal signal input/output4 (Input<"0-20mA" "0-10V" "NTC10K" NTC20K" "RTD" >; Output<"0-
10V" "0-20mA">
25 IO5 Universal signal input/output5 (Input<"0-20mA" "0-10V" "NTC10K" NTC20K" "RTD" >; Output<"0-
10V" "0-20mA">
26 C Ground (Connected to 24VAC~ground)/System ground
27 IO6 Universal signal input/output6 (Input<"0-20mA" "0-10V" "NTC10K" NTC20K" "RTD" >; Output<"0-
10V" "0-20mA">
28 C Ground
29 IO7 Universal signal input/output7 (Input<"0-20mA" "0-10V" "NTC10K" NTC20K" "RTD" >; Output<"0-
10V" "0-20mA">
20 VDC
30 C Ground
31 20 VDC
OUT 20VDC power output
BACnet
MS/TP
32(a + Signal for RS 485 bus +
33(a - Signal for RS 485 bus -
34(a COM Ground

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 8
MOUNTING
To mount the MERLIN NX IP and MSTP VAV controllers
refer the mounting instructions provided with the controller.
Before mounting the controller on damper shaft, review the
power, inputs and output specifications. See
“Specifications” on page 4.
Hardware driven by the analog current outputs must have a
maximum resistance of 550 Ohms.
NOTE:
Avoid mounting in areas where acid fumes or other
deteriorating vapors can harm the metal parts of the
controller, or in areas where escaping gas or other
explosive vapors are present.
Before Mounting Actuator onto the
Damper Shaft
MERLIN NX IP and MSTP VAV controller includes a direct
coupled actuator with Declutch mechanism, which is
shipped hard-wired to the controller.
1. Determine the direction in which the damper shaft
rotates to open the damper. Typically, there is an
etched line on the end of the damper shaft that indi-
cates the position of the damper.
Fig. 4. Determining the rotation direction (CW or CCW)
Fig. 5. Damper with 90 degree CW rotation to open
NOTE:
Mount the actuator flush with damper housing or add
a spacer between the actuator mounting surface and
damper box housing.
Fig. 6. Mounting Controller to VAV box damper housing when
actuator is not parallel to VAV box damper housing
IP ethernet RJ45-1/RJ45-2(b
(aTerminal 32,33, and 34 are available in MSTP variant only.
(bTerminal for IP variant only.
Table 5. Controller Terminals (Continued)
Type Legend Printing Description
VAV BOX
DAMPER
VAV BOX
DAMPER
HOUSING
SHAFT
ADD WASHER OR SPACER (OBTAINED
LOCALLY) BETWEEN VAV BOX DAMPER
HOUSING AND THE ACTUATOR TAB TO
KEEP THEM PARALLEL.

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
9 EN1Z-1076GE51 R1021
2. Determine the damper ‘full opening angle’ (45, 60, or
90 degrees). In Fig. 5 the damper is open to its fully
open position of 90 degrees.
Mounting Actuator onto Damper Shaft
MERLIN NX IP and MSTP VAV controllers can be mounted
in any orientation. However, ensure that, they are mounted
in a position that allows clearance for wiring, servicing,
removal, connection of the BACnet connector and access
to the service button.
Fig. 7. Mounting Actuator on Damper Shaft
NOTE:
The controller is not position sensitive and can be
mounted sideways or upside down. Use the drilling
template provided in box.
The MERLIN NX IP and MSTP VAV controller's inte-
gral actuator does not float inside the housing there-
fore it should be installed with a floating mount to
allow for non-concentric travel, which can occur with
damper shaft that are out-of-round and/or have
asymmetrical damper shaft mounts.
If the actuator does not allow any wobble, then it is
likely to bind. To prevent this, when installing the
MERLIN NX IP and MSTP VAV controllers, install it
over the damper shaft and then slide the anti-rotation
bracket underneath and into the mounting slot but not
at the very end of the slot (leave a little wiggle room).
Screw the anti-rotation bracket using two screws on
the sides of the controller. The anti-rotation bracket is
designed to be bent as needed (it has built-in bend-it-
easy slots) to accommodate difficult installation loca-
tions.
Tools Required:
— Phillips #2 screwdriver for end-limit set screw adjust-
ment
— 8 mm wrench for centering clamp
The actuator mounts directly onto the VAV box damper
shaft and has up to 44 in-lb. (5 Nm) torque, 90-degree
stroke, and 108 second timing at 50 Hz and 90 second
timing at 60 Hz.
The actuator is shipped with two mechanical end limit set
screws to control the amount of rotation from 12° to 95°.
These set screws must be securely fastened in place. To
ensure tight closing of the damper, the shaft adapter has a
total rotation stroke of 95°.
Fig. 8. Setting the mechanical end limits
NOTE: The actuator is shipped with the mechanical end-
limit set screws set to 95° of rotation.
Adjust the two set screws closer together to reduce
the rotation travel. Each “hash mark” indicator on
the bracket represents approximately 6.5° of rota-
tion per side.
The Declutch button, when pressed, allows you to
rotate the universal shaft adapter.
The unit is shipped with the actuator set to rotate open in
the clockwise (CW) direction to a full 95°. The extra 5°
ensures a full opening range for a 90⁰ damper. The
installation procedure varies depending on the damper
opening direction and angle:
1. If the damper rotates clockwise (CW) to open, and the
angle of the damper open-to-closed is 90°:
a. Manually open the damper fully (rotate clockwise).
b. Using the Declutch button, rotate the universal shaft
adapter fully clockwise.
c. Mount the actuator to the VAV damper box and shaft.
d. Tighten the two bolts on the centering clamp (8 mm
wrench; 70 lb.-in. [8 Nm] torque). When the actuator
closes, the damper rotates CCW 90 degrees to fully
close.
2. If the damper rotates clockwise (CW) to open, and the
angle of the damper open-to-closed is 45 or 60 degrees:

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 10
a. Manually open the damper fully (rotate clockwise).
b. The actuator is shipped with the mechanical end limits
set at 95 degrees. Adjust the two mechanical end-limit
set screws to provide the desired amount of rotation.
Adjust the two set screws closer together to reduce the
rotation travel.
c. Tighten the two mechanical end-limit screws (Phillips #2
screwdriver; (26.5-31 lb.-in. [3.0-3.5 Nm] torque).
d. Using the Declutch button, rotate the universal shaft
adapter fully clockwise.
e. Mount the actuator to the VAV damper box and shaft.
f. Tighten the two bolts on the centering clamp (8 mm
wrench; 70 lb. in. [8-10 Nm] torque).
g. When the actuator closes, the damper rotates CCW
either 45 or 60 degrees to fully close.
3. If the damper rotates counterclockwise (CCW) to open,
and the angle of the damper open-to-closed is 90
degrees:
a. Manually open the damper fully (rotate counterclock-
wise).
b. Using the Declutch button, rotate the universal shaft
adapter fully counterclockwise.
c. Mount the actuator to the damper box and shaft.
d. Tighten the two bolts on the centering clamp (8 mm
wrench; 70 lb.-in. [8Nm] torque). When the actuator
closes, the damper rotates CW 90 degrees to fully close.
4. If the damper rotates counterclockwise (CCW) to open,
and the angle of the damper open-to-closed is 45 or 60
degrees:
a. Manually open the damper fully (rotate counterclock-
wise).
b. The actuator is shipped with the mechanical end limits
set at 95 degrees. Adjust the two mechanical end-limit
set screws to provide the desired amount of rotation.
Adjust the two set screws closer together to reduce the
rotation travel.
c. Tighten the two mechanical end-limit screws (Phillips #2
screwdriver; (26.5-31 lb.-in. [3.0-3.5 Nm] torque).
d. Using the Declutch button, rotate the universal shaft
adapter fully counter-clockwise.
e. Mount the actuator to the VAV damper box and shaft.
f. Tighten the two bolts on the centering clamp (8 mm
wrench; 70 lb.-in. [8Nm] torque).
g. When the actuator closes, the damper rotates CW either
45 or 60 degrees to fully close.
Differential Pressure Sensor
Connect the air flow pickup to the two restrictor ports on the
controller.
NOTE:
Use 1/4 in. (6 mm Outside diameter and 5 mm inner
diameter), with a 3/64 in. (1 mm) wall thickness, ple-
num-rated 1219 FR (94V-2) tubing.
Always use a fresh cut on the end of the tubing that
connects to the air flow pickups and the restrictor
ports on the controller. Secure the connection using a
zip tie (procured locally).
NOTE:
The pressure sensor is polarity sensitive. Connect
the high pressure or upstream tube to the plastic
restrictor port labeled (+), and the low pressure or
downstream tube to the restrictor port labeled (-).
When twin tubing is used from the pickup, split the pickup
tubing a short length to accommodate the connections.
Fig. 9. Airflow pickup connections
Best Practice for Zero Calibration of Air Flow
Sensor
NOTE: The controller must be powered up for a minimum
of 1 hour before performing the zero calibration for
the air flow sensor.
If controllers are mounted in unusually dusty or
dirty environments, an in-line, 5-micron disposable
air filter (use 5-micron filters compatible with pneu-
matic controls) is recommended for the high-pres-
sure line connected to the air flow pickup.
The tubing from the air flow pickup to the controller
should not exceed three feet (1 m). Any length
greater than this will degrade the flow sensing
accuracy.
Use caution when removing tubing from a connec-
tor. Always pull straight away from the connector or
use diagonal cutters to cut the edge of the tubing
attached to the connector. Never remove by pulling
at an angle.
50°C
(122°F)
0°C
(32°F)
±500 Pa
(± 2” H2O)
Air, N2, O2
non-condensing
ø5.2mm
ø3.5mm
mm8
Secure with
cable tie

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
11 EN1Z-1076GE51 R1021
NOTICE
Dust particle contamination may be present in some
applications. Ensure appropriate measures are taken to
minimize the effect of particulate contamination.
The sense element is in parallel to the air stream and tends
to direct the dust particles in the airflow stream past the
sense element away from the sense bridge. The sense
element is a micro-structure-based device and the bridge
portion of the sense element structure is made up of two
platinum sense elements and a heater. The heater tends to
repel dust particles via a thermophoretic effect past the
heater and tends to keep most dust off the bridge structure.
The heat affect, along with a simple filter, can help to keep
the dust from causing output shifts in the output of the
device. Although the sensor naturally repels dust, some
dust and contamination can still collect on the
microstructure. Dust adherence to chip edges and channel
surfaces can be prevented by using a simple filter. A
disposable five micron filter used in series on the upstream
side of the airflow divide will provide adequate filtering in
most applications. See Table 6, “Recommended Filter
Suppliers,” on page 11 below for recommended filter
suppliers.
Airflow Sensor Replacement
Procedure to replace the airflow sensor is as follows:
1. Gently pull the sensor cover outward and rotate it by
75 degree.
Fig. 10. Removing the sensor cover
2. Disconnect the electrical connector by gently pulling it
away from the differential pressure sensor.
3. Replace the airflow sensor.
Fig. 11. Replace the sensor
4. Attach the electrical connector.
NOTE: Before closing the sensor cover, make sure to push
the excess cable into the controller cavity. The sen-
sor cover will not snap into the controller if the
cable is not tucked correctly.
5. Close the cover.
Table 6. Recommended Filter Suppliers
Pall Corporation www.pall.com
Acro 50
The filter may be used at a common mode pressure
of 0.17 MPa (24.6 psi) at a temperature of 80 °C [176
°F] May be used with swag lock compression fittings
Approximate pressure drop is 5 kPA at 1 SLPM of
flow.
Acro cap
May be used at an operating temperature of 55 °C
[131 °F] and common mode pressure of 30 psi
Sensors connections are1/4 barb fittings General
Gas filter Pressure drop is 1 psi with a flow of 15
SLPM Fittings are 1/8 barbed tubing.
Parker Balston www.balstonfilters.com
Model
9933-05
US and EMEA only sales offices. May be used at
common mode pressures up to 125 psi and operating
temperature to 135 °C [275] °F Sensor connections
are 1/4 tube.
MAHLE:
https://catalog.mahleaftermarket.com/eu/product.xhtml?ei
d=184
MAHLE
KL13 Automotive filter

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 12
WIRING
Fig. 12. UIO Wiring
NOTE:
All wiring connections for the IO, SSR, 24VAC, and 20VDC circuits are limited to the same room.
19 20 21 22 23 24 25 26 27 28 29
IO1 C IO2 IO3 C IO4 IO5 C IO6 C IO7
7 x Universal Input/Output (UIO)
Output Connection Example
Input Connection Example
ensure
correct
polarity
+
-
0 to 10 Vdc V
Volatage Inputs Thermistor / Resistive input
Volt-free / Digital input
Current Input
100 to
100k:
e.g.
20kNTC
PT1000
volt free
contact
open
collector
ensure correct
polarity
logic
circuit
3.5 mA
TTL /
CMOS
0V
IOx C
+
-V
V
IOx
IOx C
IOx C
IOx C
S
External
Power
Supply
ensure correct
polarity
SSS
S
0V IN
IN 0V
0V IN
Output Type Load
0 to 10 Vdc, 10 mA max. 1k:
4 to 20 mA 550:
IOx C IOx IOx C
Externally Powered
wetting
current
C IOx
-Voltage output to power external relay
-Protective Diode is recommeded
to protect the output
+ -
Ensure correct
polarity
IOx
C
0 to 10 V
LOAD
Ensure correct
polarity
Analog Output (UIO)
+
-
IOx
C
Analog Output (UIO) provides a variable
voltage between 0-10 VDC and the output
can source up to 20mA

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
13 EN1Z-1076GE51 R1021
Fig. 13. 20 VDC Auxiliary wiring
Fig. 14. SSR Wiring
31 30
20V DC OUT
C
1 x 20V DC Auxiliary
Power Output
31 30
20V DC OUT
C
29 28
IO7
C
S
BlackWhite
7
8 9
10
11
12 13
4 5
SR1 C SR2 SR3 C SR4 SR5 C AC OUT SR IN
5 x Solid State Relay (SSR)
6
SR IN (terminal 5, SSR POWER input) is connected to AC
OUT (terminal 4, 24V AC~ output) by a jumper wire at
factory.
Remove the jumper if different voltages needs to be used
for SSRs.
All ports are protected against short circuit and 24VAC
miswiring
LOAD LOAD POWER
SUPPLY
SRx C
SRx C

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 14
POWER SUPPLY
General Information
To prevent a risk of injury due to electrical shock and/or
damage to device due to short-circuiting, low-voltage and
high-voltage lines must be kept physically separate from
one another. Further, to prevent a risk of short-circuiting
and damage to your unit, do not reverse the polarity of the
power connection cables, and avoid ground loops (i.e.,
avoid connecting one field device to several controllers).
Before wiring the controller, determine the input and output
device requirements for each controller used in the system.
Select input and output devices compatible with the
controller and the application. Consider the operating
range, wiring requirements, and the environment conditions
when selecting input/output devices.
Determine the location of controllers, sensors, actuators
and other input/output devices and create wiring diagrams
for illustrations of typical controller wiring for various
configurations.
The application engineer must review the control job
requirements. This includes the sequences of operation for
the controller, and for the system as a whole. Usually, there
are variables that must be passed between the controllers
that are required for optimum system wide operation.
Typical examples are the TOD, Occ/Unocc signal, the
outdoor air temperature, the demand limit control signal,
and the smoke control mode signal.
It is important to understand these interrelationships early in
the job engineering process, to ensure proper
implementation while configuring the controllers.
NOTE:
All wiring must comply with applicable electrical
codes and ordinances. Refer to job or manufacturers’
drawings for details. Local wiring guidelines (for
example, IEC 364-6-61 or VDE 0100) may take pre-
cedence over recommendations provided in these
installation instructions.
To comply with CE requirements, devices having a
voltage of 50-1000 VAC or 75-1500 VDC but lacking
a supply cord, plug, or other means for disconnecting
from the power supply must have the means of dis-
connection incorporated in the fixed wiring. This type
of disconnection must have a contact separation of at
least 1/8 in. (3 mm) at all poles.
Power Wiring
All wiring must comply with applicable electrical codes and
ordinances, or as specified on installation wiring diagrams.
Controller wiring is terminated to the screw terminal blocks
located on the device.
NOTE:
For multiple controllers operating from a single trans-
former, the same side of the transformer secondary
must be connected to the same power input terminal
in each controller.
All loads on the controller must be powered by the
same transformer that powers the controller itself. A
controller can use separate transformers for control-
ler power and output power.
The 24 VAC power from an energy limited Class II power
source must be provided to the controller. To conform to
Class II restrictions (U.S. only), the transformer must not be
larger than 100 VA.
NOTE:
Power must be off prior to connecting or removing
connections from the 24 VAC power (24 V~/24 V0),
and 20 VDC power (20 VDC) terminals.
Use the heaviest gauge wire available, up to 18 AWG
(1 mm2), with a minimum of 22 AWG (0.3 mm2), for
all power wiring.
CAUTION
CAUTION
Where multiple devices are powered from a single
transformer, the same side of the transformer
secondary must be connected to the same power
input terminal in each device.

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
15 EN1Z-1076GE51 R1021
Fig. 15. Power wiring
!
Important: Where multiple devices are powered from
a single transformer, the same side of the transformer
secondary must be connected to the same power input
terminal in each device.
Supply voltage: 24 VAC (20 to 30 VAC) 50/60 Hz
O
I
DO NOT SWITCH ON POWER
For UL rating the
transformer must
be class 2 rated.
*If the power supply
is not current-limited,
an external 4A fuse
or circuit breaker
*
110VAC
/230VAC 24 VAC
321
~
V0
!
must be fitted.
!Important: When connecting power ensure that one
leg of the 24VAC secondary circuit and the ground
terminal on the device are connect to a known earth
ground at the panel/enclosure. Limit the distance of the
power wire run between the device and the transformer
to 15 feet (4.5 meters and restricted for same room
installation).
The transformer must be UL Listed for smoke control.
The transformer also needs to mounted and installed in
an enclosure. It is recommended to use a 15407287

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 16
The RS485 Standard
According to the RS485 standard (TIA/EIA 485: “Electrical
Characteristics of Generators and Receivers for Use in
Balanced Digital Multipoint Systems”), only one driver
communicating via an RS485 interface may transmit data at
a time. Further, according to U.L. requirements, each
RS485 interface may be loaded with a max. of 32 unit
loads. For example, if a controller utilizes as little as 1/8 unit
load each, up to 256 devices can be connected.
BACnet connections to the RS485 interfaces must comply
with the RS485 standard. Thus, it is recommended that
each end of every bus should be equipped with a
termination resistor (not included in shipment) having a
resistance equal to the cable impedance (120 Ω; the
wattage should be in the range of 0.25 – 0.5 W).
RS485 systems frequently lack a separate signal ground
wire. However, the laws of physics still require that a solid
ground connection be provided for in order to ensure error-
free communication between drivers and receivers – unless
all of the devices are electrically isolated, and no earth
grounding exists.
NOTE:
A separate signal ground wire must be used. Failing
to obey this requirement can lead to unpredictable
behavior if other electrically non-isolated devices are
connected and the potential difference is too high.
TIA/EIA 485 Cable Specifications
The following cable specification is valid for BACnet MS/TP
EIA 485 buses.
The following cables fulfill this requirement:
— AWG 18 (1 mm2)
— Shielded, twisted pair cable J-Y-(St)-Y 4 x 2 x 0.8 mm2.
— CAT 5,6,7 cable - use only one single pair for one bus
— Belden 9842 or 9842NH.
Wiring Method
NOTE:
When attaching two or more wires to the same termi-
nal, other than 14 AWG (2.0 mm2), be sure to twist
them together. Deviation from this rule can result in
improper electrical contact, see Fig. 16 below.
Each terminal can accommodate the following gauge of
wire:
•Single wire: From 22 AWG (0.3 mm2) to 18 AWG (1
mm2) solid or stranded
•Multiple wires: Up to two 18 AWG (1 mm2) stranded, with
1/4 watt wire-wound resistor
— Prepare wiring for the terminal blocks, as follows:
— Strip 1/2 in. (13 mm) insulation from the conductor.
— Cut a single wire to 3/16 in. (5 mm). Insert the wire in
the required terminal location and tighten the screw.
— If two or more wires are being inserted into one ter-
minal location, twist the wires together a minimum of
three turns before inserting them, see Fig. 16 below.
— Cut the twisted end of the wires to 3/16 in. (5 mm)
before inserting them into the terminal and tightening
the screw.
— Pull on each wire in all terminals to check for good
mechanical connection.
NOTE:
Do not over-tighten the terminal screws to avoid
deformation and damage of the terminal block. The
maximum torque for the terminal screws 4.4 lb.-in.
(0.5 Nm).
Fig. 16. Attaching two or more wires at terminal block
Table 7. TIA/EIA 485 cable specifications
Maximum length 4000 ft (9.6–76.8 kbps)
Cable type Twisted pair shielded (foil or braided
shields are acceptable)
Characteristic
impedance 100-130 Ω
Distributed
capacitance between
conductors
Less than 100 pF per meter (30 pF
per foot)
Distributed cap.
between conductors
and shield
Less than 200 pF per meter (60 pF
per foot)

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
17 EN1Z-1076GE51 R1021
COMMUNICATION
BACNET MS/TP VARIANT
Each controller uses a BACnet MS/TP communications
port. The controller’s data is presented to other controllers
over a twisted-pair MS/TP network, which uses the TIA/EIA
485 signaling standard capable of the following baud rates:
9.6, 19.2, 38.4, 57.6, and 76.8 Kilobits per second. The
MERLIN NX BACnet MS/TP controllers are master devices
on the MS/TP network. Each MERLIN NX BACnet
controller uses a high-quality TIA/EIA 485 transceiver and
exerts 1/8 unit load on the MS/TP network.
The controller features an 2-wire non-isolated RS485
interface (terminals 32, 33, and 34) suitable for BACnet
MS/TP communication. The terminal block containing it is
Grey. The cable length affects the baud rate, see Table 8,
“Baud rate vs. Maximum cable length,” on page 17 below.
NOTE: The maximum BACnet MS/TP network Bus seg-
ment length is 4,000 ft. (1200 m) using recom-
mended wiring. Repeaters must be used when
making runs longer than 4,000 ft. (1200 m). A max-
imum of three repeaters can be used between any
two devices.
Setting the MS/TP MAC Address
The MS/TP MAC address for each device must be set to a
unique value in the range of 1-127 on an MS/TP network
segment (address 0, 1, 2, & 3 should be avoided as they
are commonly used for the router, diagnostic tools, and as
spare addresses). A seven position DIP switch on the
MERLIN NX MS/TP BACnet controller is used to set the
controller's MAC address.
NOTE:
DIP setting of all-ON or all-OFF will enable the Auto
MAC mode in controller and the dip switches will not
be used for MAC addressing. See “Automatic MAC
Addressing” on page 24.
To set the MS/TP MAC address of a MERLIN NX BACnet
MSTP VAV controller:
1. Find an unused MAC address on the MS/TP network to
which the MERLIN NX MS/TP VAV controller connects.
2. Locate the DIP switch bank on the MERLIN NX MS/TP VAV
controller BACnet for addressing.
3. Powered off the MERLIN NX MS/TP BACnet Controller and
set the DIP switches for the MAC Address you want.
Add the value of DIP switches set to ON to determine the
MAC address. See Table 9, “DIP Switch Values For
MS/TP MAC Address,” on page 17 below.
For example, if only DIP switches 1, 3, 5, and 7 are enabled
the MAC address would be 85 (1 + 4 + 16 + 64 = 85).
Fig. 17. Calculating the MAC address
Setting the Device Instance Number
The Device Instance Number must be unique across the
entire BACnet system network because it is used to
uniquely identify the BACnet devices. It may be used to
conveniently identify the BACnet device from other devices
during installation. The MERLIN NX MS/TP BACnet
Controllers Device Instance Number is automatically set
when it is added to a ARENA-NX project. The Device
Instance Number can be changed by the user, which may
be necessary when integrating with a third party or when
attempting to replace an existing controller and it is desired
to maintain the existing Device Instance Number.
NOTE:
This controller is insensitive to bias voltages because
of failsafe chip-set inside and can share the BACnet
bus with other devices with or without bias voltages.
Termination Resistors
Matched terminating resistors are required at each end of a
segment bus wired across (+) and (-). Use matched
precision resistors rated ¼ W ±1% / 80 - 130Ω.
Ideally, the value of the terminating resistors should match
the rated characteristic impedance of the installed cable.
For example, if the installed MS/TP cable has a listed
characteristic impedance of 120Ω, install 120 Ω matched
precision resistors.
Table 8. Baud rate vs. Maximum cable length
Baud rate Maximum cable
length (L)
9.6, 19.2, 38.4, 57.6, and 76.8 kbps 4000 ft (1200 m)
1 432 5 76
ON
1 432 5 76
ON
All ON All OFF
Table 9. DIP Switch Values For MS/TP MAC Address
DIP 1 2 3 4 5 6 7
VALUE 1 2 4 8 16 32 64
1 432 5 76
ON
1 4 16 64
+ + +
= 85
0
+ +
0 0
+

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 18
Shied Termination
Following proper MS/TP cabling shield grounding
procedures is important to minimize the risk of
communication problems and equipment damage caused
by capacitive coupling. Capacitive coupling is caused by
placing MS/TP cabling close to lines carrying higher
voltage. If shielding is used, the shielding of each individual
bus segment should be separately connected at one end to
earth.
NOTE:
If any of the devices are electrically isolated, it is rec-
ommended that those devices be connected to signal
ground.
Connecting to BACnet MS/TP Buses
The controller communicates via its BACnet MS/TP
interface with other BACnet MS/TP-capable devices (for
example, other room controllers or MS/TP controllers). In
doing so, the following considerations should be taken into
account.
— Maximum BACnet MS/TP bus length = "L" on
Fig. 18 See Table 8, “Baud rate vs. Maximum cable
length,” on page 17.
— Twisted-pair cable, for example,
• AWG 18 (1 mm2)
• J-Y(ST)Y 4 x 2 x 0.8 mm2 or a special RS485 cable.
• CAT 5,6,7 cable – use only one single pair for one bus
• Belden 9842 or 9842NH and
• Daisy-chain topology.
• Must conform to TIA/EIA RS485 cabling guidelines and
ANSI/ASHRAE Standard 135-2010.
BACnet MS/TP Limitataions
There are two limitations regarding the number of
controllers per BACnet MS/TP channel:
PHYSICAL LIMITATION:
32 loads as per TIA/EIA-485 standard. One MERLIN NX
MSTP VAV controller represents 1/8 load. The physical
limitation is important in case 3rd party devices
representing a full load are connected.
AUTOMAC LIMITATION:
See Table 8, “Baud rate vs. Maximum cable length,” on
page 17 for default maxmaster value. It can be modified by
the user. Refer IRM Engineering Tool User Guide for more
information on how to do this?
A maxMaster of 64 means we can support a maximum of
62 BACnet MSTP VAV controllers, one supervisor, and one
BACnet client (tool) per BACnet MS/TP channel.
Thus, depending upon the actual performance needs and
required communication rates, it is recommended to
connect a smaller number of BACnet MS/TP devices per
channel.
NOTE:
It is recommended not to have more than 62 control-
lers on single MSTP channel.
Fig. 18. Connection to a BACnet MS/TP Bus
Default
maxmaster
Default
MinMAC
Default
MaxMAC
Default Baud
rate
64 1 60 38400
L*
ϭϮϬɏ
RS485+
RS485-
COM
MSTP VAV
CONTROLLER #1
+
- COM
MSTP VAV
CONTROLLER #2 MSTP VAV CONTROLLER #..N
ϭϮϬɏ
PLANT
CONTROLLER
+
- COM
+
- COM
*for Maximum BACnet MS/TP bus length refer table Baud rate vs. Maximum cable length
NOTE:
1) If any of the devices are not electrically isolated, it is recommended that those devices be connected to the ground terminal (V0).
2) The 120-Ohm termination resistor must be inserted directly into the terminals of both end devices.
3) If shielding is used, the shielding of each individual bus segment should be separately connected at one end to earth.
4) Always power each controller and the connected slaves via separate transformers.
5) Between devices equipped with non-isolated RS485 bus interfaces, potential dierences of max. ±7 V are allowed. Further, this bus should not extend beyond a single building.

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
19 EN1Z-1076GE51 R1021
Wiring Topology
Only daisy-chain wiring topology is allowed. Other wiring
topologies (such as, star wiring, mixed star wiring, and
daisy chain wiring) are prohibited. This is to avoid
communication problems of the physical layer. See Fig. 24
and Fig. 25.
Antenna
MERLIN NX IP and MSTP VAV controllers has a local
rubber antenna included in the kit. The antenna facilitates
wireless communication via Wi-Fi and Bluetooth with other
devices. If the MERLIN NX IP and MSTP VAV controller is
mounted inside a cabinet/enclosure and you are using the
local antenna, use an enclosure that is made of a non-
metallic material to achieve a reliable wireless signal.
Replace the local antenna with the Remote antenna when
an extended range is needed or when the MERLIN NX IP
and MSTP VAV controller is mounted in a metal
cabinet/enclosure. The Remote antenna has a cable that
connects to the MERLIN NX IP and MSTP VAV controller,
and the antenna mounted outside the cabinet/closure.
When the MERLIN NX IP and MSTP VAV controller are
mounted inside a metal cabinet/enclosure, the Remote
Antenna is required to achieve a reliable wireless signal.
Installing the Local Antenna
1. Insert local antenna terminal nut into the SMA con-
nector.
2. Tighten by turning the base of the antenna clockwise.
Fig. 19. Installing a Local Antenna
Installing the Remote Antenna
1. Uninstall the Local antenna by turning the base of the
antenna counter-clockwise.
2. Place the Remote antenna where the signal reception
is good.
3. Safely route the Remote antenna wire terminal nut to
the MERLIN NX IP and MSTP VAVcontroller.
4. Insert the wire terminal nut into the SMA connector.
5. Tighten the wire terminal nut by turning the nut clock-
wise. Do not over-tighten.
Fig. 20. Installing a Remote Antenna
Remote Antenna Placement
• Place and align the antenna in a way that the Wi-Fi
signal does not interfere with many obstacles.
• Make sure that the antenna is installed perpendicular to
the surface for a good Wi-Fi signal.
• The antenna has a strong signal transmission and
reception from the side. See figure below. Position the
sides of the antenna towards the device it is
communicating with (e.g WiFi Node).
Fig. 21. Remote Antennae Placement
SMA Connector
Local Antennae
Table 10. types of building materials and range
reduction
Wall Material Range
Reduction
Wood, drywall, glass 0-10%
Brick, Particle board 5-25%
metal, steel-reinforced concrete wall 10-90%
SMA Connector
Remote
Antennae
Terminal nut
Wi-Fi Node
Wi-Fi Node
Wi-Fi Node

MERLIN NX IP AND MST/TP VAV CONTROLLER - INSTALLATION INSTRUCTIONS
EN1Z-1076GE51 R1021 20
• Do not install the antenna close to the floor.
Fig. 22. Remote Antennae Placement
• Keep the antenna away from devices that cause wireless
interference such as other Wi-Fi network and
telecommunications equipment.
• The Local antenna can be used when the IP and MSTP
VAV controller is installed in a plastic cabinet/enclosure.
SYLK BUS™
Sylk™ Bus capable wall modules such as CLCMTR40x /
CLCMTR42x can be connected to the controller's Sylk™
Interface (terminals 14 and 15).
• The Sylk™ Bus is single pair, and polarity-insensitive.
• Maximum current provided at the Sylk™ Bus interface:
96 mA.
• The maximum number of wall modules depends on the
following wall module specific information:
— Sylk™ bus power consumption
— Number of parameters used
— Total config file size
The Niagara tool has an inbuilt resource calculator to
calculate the number of Sylk™ wall modules.The Sylk™
devices supported by the MERLIN NX IP and MSTP VAV
are;
CLN WALL MODULES
CLCMTR40, CLCMTR40-H, CLCMTR40-H-CO2,
CLCMTR40-CO2, CLCMTR42, CLCMTR42-H,
CLCMTR42-H-CO2, CLCMTR42-CO2, CLCMTR71-H,
CLCMTR120 (TR75E) and CLCMTR120-H (TR75-HE)
NOTE:
The CLCMTR42x Wall Module must be version
1.00.3 or higher.
NOTE:
CLCMTR70 Wall Modules are not supported.
Fig. 23. Sylk™ Wiring Topologies
Surface
Surface
Table 11. Recommended max. distances from controller to
TR40x/T42x wall modules
Single twisted pair, Non-Shielded,
Stranded or Solidc)
Standard non-twisted
thermostat wire
shielded or Non-
Shielded, Stranded or
Solidd)
18 - 22 AWG
(0.33 to 1mm2)
24 AWG
(0.20 mm2)
18 - 24 AWG
(0.20 to 1 mm2)
500 ft
(150 m)
400 ft
(120 m)
100 ft
(30 m)
c)As a rule of thumb, single twisted pair (two wires per
cable, only), thicker gauge, non-shielded cable yields the
best results for longer runs.
d)The 100 ft (30 m) distance for standard thermostat wire
is conservative but is meant to reduce the impact of any
sources of electrical noise (incl. but not limited to VFDs,
electronic ballasts, etc.). Shielded cable recommended
only if there is a need to reduce the effect of electrical
noise.
These distances apply also for shielded twisted pair.
Number of Devices: Subject to power loading - refer to device
documentation).
to additional
Sylk devices
OVERRIDEFAN
polarity
independent
IP VAV IP VAV
Sylk Device
e.g.
TR40, TR42.
14 15
Home Running Daisy Chaining