nor-tec MES2 User manual

MES2
Installation and
Operation Manual
Includes installation, operation
maintenance and troubleshooting
information for the MES2 Electrode
Steam humidifier
2554140-B|18 OCT 2010
Important: Read and save these instructions. This guide to be left with equipment.

Thank you for choosing Nortec.
Proprietary Notice
This document and the information disclosed herein are proprietary data of WALTER MEIER LTD. Neither this
document nor the information contained herein shall be reproduced, used, or disclosed to others without the
written authorization of WALTER MEIER LTD., except to the extent required for installation or maintenance of
recipient’s equipment. All references to the Nortec name should be taken as referring to WALTER MEIER LTD.
Liability Notice
Nortec does not accept any liability for installations of humidity equipment installed by unqualified personnel or
the use of parts/components/equipment that are not authorized or approved by Nortec.
Copyright Notice
Copyright 2010, WALTER MEIER LTD. All rights reserved.
INSTALLATION DATE (MM/DD/YYYY)
MODEL #
SERIAL #
CYLINDER #

Contents
1 Introduction
2 Receiving and Unpacking
3 MES2 Models
6 Options and Accessories
7 Humidifier Components
9 Humidifier Schematic
9 How the Humidifier Works
11 Installation
12 Typical MES2 Installation
13 Location
14 Mounting
15 Plumbing
16 Steam Lines and Condensate
Returns
19 Primary Voltage Wiring
20 Control Wiring
21 Modbus Wiring
22 MES2 Installation Checklist
23 Operation
24 User Interface
25 Humidifier Configuration
27 Modbus Configuration
30 Start Up Procedure
31 Maintenance and
Servicing
32 Required Maintenance
36 Extended Shutdown
37 Maintenance Checklist
39 Troubleshooting
41 General Troubleshooting
43 MES2 Faults
45 Wiring Diagram
46 Spare Parts
50 Warranty

1 | Introduction
Introduction
CAUTION: Servicing
Disconnect main power before performing any servicing.
The plumbing and electrical compartments contain high voltage components and
wiring. Access should be limited to authorized personnel only.
During and following operation of the humidifier, the steam and components in
contact with the steam such as the steam lines, steam distributors, cylinders, and
condensate lines can become hot and can burn if touched.
Walter Meier does not accept any liability for improperly installed humidity
equipment or the use of parts/components/equipment that are not authorized or
approved by Walter Meier.
CAUTION: Electrical
All electrical work should in accordance with the local electrical code in location
where the humidifier will finally be operated.
CAUTION: Plumbing
Drain water from humidifier can be very hot. Do not drain to public sink.
All plumbing work should be in accordance with local plumbing code in location
where the humidifier will finally be operated.
CAUTION: Installation
Do not mount on hot surfaces
Do not mount in area where freezing can occur
Do not mount on vibrating surface
The MES2 produces steam at atmospheric pressure. No devices which could block
steam output should be connected to the steam outlet.
Steam lines must be installed so that no restriction can produce backpressure in
the humidifier.
Regardless of selecting on/off or modulating control method, Nortec humidifiers
must have a closed circuit across its on/off security loop control terminal to
operate. Nortec highly recommends the use of a duct high limit humidistat and air
proving switch.

Introduction | 2
Receiving and Unpacking
1Check packing slip to ensure ALL material has been delivered.
2All material shortages are to be reported to Nortec within 48 hours from receipt of goods.
Nortec assumes no responsibility for any material shortages beyond this period.
3Inspect shipping boxes for damage and note damages on shipping waybill accordingly.
4After unpacking, inspect equipment for damage and if damage is found, notify the shipper
promptly.
5All Nortec products are shipped on an FOB factory basis. Any and all damage, breakage or
loss claims are to be made directly to the shipping company.
Before Installation
1Ensure that available voltage and phase corresponds with humidifier voltage and phase as
indicated on humidifier’s specification label.
2Ensure that the dedicated fused disconnect provided for the humidifier is of sufficient size to
handle the rated amps as indicated on the specification label.
3Ensure sufficient clearances will be available as described in “Location” on page 13.
4Ensure steam lines can be routed to distributor as described in Steam Lines and
Condensate Returns on page 16.
Figure 1: Specification Label Location

3 | Introduction
MES2 Models
The MES2 is the most advanced OEM steam humidifier available and provides steady and
reliable humidification using the same proven cylinder technology as Nortec’s commercial
NHTC. The MES2 is offered in 5 models corresponding to control configurations as shown in
Figure 2. The remote configurations include 8 ft (2.4 m) of wiring for connecting the controls
to the plumbing cabinet. The Primary Voltage Wiring (PVW) model provides 8 feet of primary
wiring for connection to the contactor.
Figure 2: MES2 Models
The MES2 is available in 6 capacities ranging from 5 to 30 lb/hr (2.3 to 13.6 kg/hr) for
operation on a range of voltages and phases as outlined in Table 1: MES2 Part Numbers and
Electrical Data. The 6 capacities are packaged in 4 different cabinet sizes as shown in Figure 3.
Figure 3: MES2 Capacities and Cabinets
5 lb/hr
(2.3 kg/hr)
15 - 20 lb/hr
(6.8 - 9.1 kg/hr)
25 - 30 lb/hr
(11.4 - 13.6 kg/hr)
10 lb/hr
(4.5 kg/hr)
(REM CE)
(ATT OE)
(ATT CE) (ATT CE PVW)
(REM OE)
RemoteAttached Attached PVW
N/A
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Introduction | 4
Table 1: MES2 Part Numbers and Electrical Data
Capacity Phase Attached
Open
Elec.
Attached
Closed
Elec.
Remote
Open
Elec.
Remote
Closed
Elec.
Attached
Closed
Elec.
PVW
Stan
dard
Cylin
der
Volts Amps Max
Ext
Fuse
KW
lb (kg) ATT OE ATT CE REM OE REM CE
ATT CE
PVW No. V A A KW
5 (2.3) 1
2550262 2550263
2550264 2550265 2550266 102
208 8.2
15
1.7
240 7.4 15
277 6.1 15
2550267 2550268 2550269 2550270 2550271 103 380 4.5 15
2550272 2550273 2550274 2550275 2550276 104 480 3.7
15
600 3.0 15
10 (4.5) 1
2550277 2550278
2550279 2550280 2550281 202
208 16.3
25
3.4
240 14.8 20
277 12.3 20
2550282 2550283 2550284 2550285 2550286 203 380 8.9 15
2550287 2550288 2550289 2550290 2550291 204 480 7.4
15
600 5.9 15
15 (6.8)
1
2550300 2550301
2550302 2550303 2550304 321
208 24.5
40
5.1
240 22.2 30
277 18.4 30
2550305 2550306 2550307 2550308 2550309 305 380 13.4 20
2550310 2550311 2550312 2550313 2550314 309 480 11.1
15
600 8.9 15
3
2550315 2550316
2550317 2550318 2550319 303 208 14.2
20
240 12.8 20
2550320 2550321 2550322 2550323 2550324 311 380 7.7 15
2550325 2550326 2550327 2550328 2550329 311 480 6.4
15
600 5.1 15
20 (9.1)
1
2550340 2550341
2550342 2550343 2550344 321
208 32.7
50
6.8
240 29.6 45
277 24.5 35
2550345 2550346 2550347 2550348 2550349 305 380 17.9 30
2550350 2550351 2550352 2550353 2550354 309 480 14.8
25
600 11.8 20
3
2550355 2550356
2550357 2550358 2550359 303 208 18.9
30
240 17.1 25
2550360 2550361 2550362 2550363 2550364 311 380 10.3 15
2550365 2550366 2550367 2550368 2550369 311 480 8.5
15
600 6.8 15
25 (11.4) 3
2553765 2553766
2553767 2553768 2553769 421 208 23.6
35
8.5
240 21.3 30
2553770 2553771 2553772 2553773 2553774 407 380 12.9 20
2553775 2553776 2553777 2553778 2553779 411 480 10.7
15
600 8.5 15
30 (13.6) 3
2550370 2550371
2550372 2550373 2550374 421 208 28.3
40
10.2
240 25.6 40
2550375 2550376 2550377 2550378 2550379 407 380 15.5 25
2550380 2550381 2550382 2550383 2550384 411 480 12.8
20
600 10.2 15

5 | Introduction
MES2 Dimensions / Weights
Note: Unless otherwise specified dimensions are in inches (cm). Tolerance ±0.1 in. (0.25 cm)
Capacity
lb/hr (kg/hr)
A
Width
B
Depth
C
Height
D*
Steam
Outlet
E*
Steam
Outlet
F
Elec.
Pos.
G
Elec.
Height
H
Drain
Center
J
Drain
Center
Net/Full
Weight**
lb (kg)
5
(2.3)
7.5
(19)
6.4
(16.3)
12.7
(35.3)
4.2
(10.7)
5.1
(13)
0.3
(0.8)
4.9
(12.5)
5.6
(14.2)
3.4
(8.6)
10.7/14.2
(5/6.6)
10
(4.5)
7.5
(19)
6.4
(16.3)
16.8
(42.7)
4.2
(10.7)
5.1
(13)
0.3
(0.8)
8.0
(20)
5.6
(14.2)
3.4
(8.6)
12.4/18.4
(5.8/8.5)
15-20
(6.8 – 9.1)
8.9
(22.6)
7.9
(20.1)
20.0
(50.8)
5.1
(13)
4.0
(10.2)
1.1
(2.8)
11.2
(28.5)
6.4
(16.3)
4.2
(10.7)
16.5/30.5
(7.8/14.2)
25-30
(11.4 – 13.6)
10.3
(26.2)
9.8
(24.9)
20.7
(52.6)
5.5
(14)
4.9
(12.5)
2.2
(5.6)
11.6
(29.5)
6.8
(17.3)
5.2
(13.2)
20.2/43.2
(9.5/20.0)
Note: * Steam Outlet is not centered on MES2 5 & 10 lb/hr (2.3 & 4.5 kg/hr) models.
** Weights given for MES2 with enclosed electronics and optional plumbing enclosure. Full Weight is weight with cylinder full of
water. Full weight may exceed this value at end of cylinder life depending on the amount of scale and its composition.
Figure 4: MES2 Dimensions and Weights
5.50
14
F
2.30
5.8 A
B
C
D
E
3.70
9.4 1.73
4.4
G
7.79
19.8
1.28
3.3
0.57
1.4
2.5 (6.4) MES2 25 - 30
1.5 (3.8) MES 5 - 20
0.80
2
1.12 x 2.0 (2.85 x 5.1) Slot
Both Cabinet Sides
0.30
0.8
J
H
O
5.45
13.8
Rotate 360
v to
Desired Position
0.875 (22 mm) O
Steam Outlet
0.34 (9 mm)
Condensate
Return
1/8 NPT
Fill Connection
0.875 (22 mm) O
Drain Outlet

Introduction | 6
Options and Accessories
An enclosed plumbing option is available for each MES2 cabinet size. The option consists of a
fixed cabinet with an easily removable door for servicing. Figure 5 shows the enclosed
plumbing option installed on a 10 lb/hr MES2 ATT CE.
Figure 5: Enclosed Plumbing Option
Nortec also provides a complete line of options and accessories for every humidification
application. The following table lists some of the most common accessories available for use
with the MES2 humidifier. Refer to the installation instructions that come with the accessories
for their proper installation and operation.
Table 2: Options and Accessories
Option / Accessory Used For
Modbus Interface Controlling humidifier operation via Modbus (See Modbus Wiring
on page 21 and Modbus Configuration on page 27).
Enclosed Plumbing See above.
Steam Distributors Adding steam into air ducts.
On/Off or Modulating Control Humidistats Controlling the output of the humidifier based on sensed RH.
Air Proving Switch Insuring humidification only occurs when air is moving in a duct.
Steam Hose Connecting humidifier to steam distributor.
Condensate Hose Collecting and draining condensate that collects in steam
distributors and steam distribution lines.
Capacity Part No.
10 lb/hr (4.5 kg/hr)
15, 20 lb/hr (6.8, 9.1 kg/hr)
25, 30 lb/hr (11.4, 13.6 kg/hr)
Enclosed Plumbing Part Numbers
5 lb/hr (2.3 kg/hr) 2554073
2554074
2554075
2554076

7 | Introduction
Humidifier Components
Figure 6: MES2 Components
On/Off/Drain Switch
Control Board
Power Relay
Electrical Cover
Control Connection
Terminals
Ground Clam
p
Bracket, Remote
Electrical
Steam Outlet
Condensate Return
Fill Cup
Drain Valve Drain Outlet
Drain Canal
Fill Valve
Cylinder
Cylinder Plug
High Water Sensor
Plug
Fill Inlet
Plumbing
Enclosure
(Optional)
Plumbing
Door
(Optional)
Cylinder
Tie Wrap
Drain Pan
Status Lights
Current Sensor
Capacity Adjustment
Potentiometer