Carel MC Instruction manual

MC
Room Atomizing
Humidification System
(Modulating Operation)
ROdfskd
Installation
Operation
& Maintenance
Manual
Read and Save
these Instructions

MC room modulating
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Installation, Operation, Maintenance Manual
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Table of Contents
Installation Instructions................................................................................................................5
Step 1 Installation Rules .....................................................................................................5
Step 2 Assemble atomizing head assemblies...................................................................6
Step 3 Plan system layout (assistance is available from Carel USA)..............................7
Step 4 Mount the cabinet ....................................................................................................9
Step 5 Connect air and water............................................................................................10
Step 6 Connect electric power..........................................................................................10
Step 7 Mount and wire sensors & safeties ......................................................................11
Step 8 Installation Checklist .............................................................................................12
Step 9 Startup Procedures................................................................................................13
Operating the MC controls..........................................................................................................14
Keyboard COMMANDS............................................................................................................14
System Status ..........................................................................................................................15
User Settings............................................................................................................................16
Current Alarms.........................................................................................................................17
Run Hours.................................................................................................................................19
Service Settings.......................................................................................................................20
Factory Settings.......................................................................................................................22
Factory Defaults (Caution) ......................................................................................................23
Date/Time Setting.....................................................................................................................24
Manual Control.........................................................................................................................24
Alarm History ...........................................................................................................................24
Communications......................................................................................................................25
Maintenance Instructions ...........................................................................................................26
Trouble Shooting Instructions ...................................................................................................27
Parts of Atomizing Heads...........................................................................................................29
Parts of Control Cabinet Control Sections................................................................................30
Wiring Diagrams..........................................................................................................................32
Copyright © 2005 by Carel USA, LLC. All rights reserved.
About Support Systems:
The MC system requires clean compressed air and water to operate efficiently and with
minimal maintenance.
Compressed Air Requirements: 0.15 CFM per pound of water per hour is required. DO
NOT UNDERSIZE AIR COMPRESSORS. The system cabinets should be fed with a minimum
of 100 psi of compressed air. Internal regulators are used to reduce it to the required discharge
pressure to the atomizing heads (30 psi at manifold ends, at full load output conditions).
Compressor after cooler, moisture separator and trap, and 0.1 micron coalescing filter are the
minimum requirements. Oil from compressed air will cause excessive maintenance on the
atomizing heads. SUPPLY AIR PIPING MUST BE SIZED PROPERLY TO AVOID
EXCESSIVE PRESSURE DROP.
Water Requirements: The system requires 5 psi of clean water at the atomizing manifolds.
20 psi to the cabinet is the recommended minimum. If water lines are old, steel, or galvanized,
then a water filter is required prior to the control cabinet. NEVER use steel or galvanized pipe
within the system.

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How the MC Works
The MC atomizing system is built around the exclusive atomizing nozzle design developed by
Carel LLC over 10 years ago. This nozzle has many exclusive features:
All stainless steel construction
Special piston lubricant that avoids liberation of ions
Most efficient design of air use versus droplet size
Simple design with extremely low maintenance
The MC atomizing head uses what is called “Supersonic Vacuum Implosion” technology. This
technology produces small droplets using minimal compressed air with relatively low pressures
(30 psi air, 5 psi water). Air and water regulators and solenoid valves in the control cabinet control
the pressures and flow to the nozzles.
On a call for humidity, the air valve is opened and air flows to the nozzles. When the air pressure
rises high enough, it will push back the pistons in the atomizing nozzles, pulling back the cleaning
needle and opening the water seat, allowing water to then flow out of the nozzles and be
atomized. The nozzles are failsafe in that if the air pressure is too low, the pistons will remain
closed and prevent water flow. The tip of the cleaning needle is also used as a secondary
modulation valve giving the MC its exclusive 100:1 modulating turn down.
In operation, compressed air exits the front of the nozzle through a precision metered orifice which
surrounds the water orifice. As the air exits at supersonic speed, it produces a high vacuum
around the water orifice. Water is drawn into the vacuum and super compressed. The water is
then instantly accelerated to supersonic speed and decompressed, tearing it into tiny droplets and
also distorting the droplets wildly. This distortion causes micro ingestion of the surrounding
atmospheric air, enhancing the speed at which the droplets then evaporate. Modulating the
compressed air supply to the heads causes the pistons to move, modulating the water flow.
LIMITED WARRANTY
All products manufactured by Carel USA, LLC are warranted to the original purchaser to be free from defects
in materials and workmanship in the course of normal and reasonable use for a period of 2 years from the
date of installation or 2 years and 1 month from the date of shipment (The OEM controls warranty is 2 years
from date of manufacture), whichever comes first, so long as the product has been installed and operated in
accordance with all appropriate manuals and wiring diagrams, and started up by a qualified Carel USA
technician. Any product or part that is found to be defective will, at the option of Carel USA, LLC be replaced
or repaired. Carel USA, LLC reserves the right to inspect any part or installation before replacing or repairing
defective parts. After startup of the product, labor for repairs or replacement of parts is not covered by this
warranty. Products not included in this warranty are NTC and PTC probes, transformers (TRA series), and
routinely replaceable parts such as steam cylinders and gaskets. Carel USA, LLC assumes no liability for
consequential or inconsequential damage, or damage due to negligence or improper use. Under the terms of
this warranty, the original purchaser may have certain legal rights and other rights, which may vary from state
to state. The Warranty will not be considered valid if a product is damaged due to negligence, mishandling or
misapplication, or if the product label is missing. Carel USA will attempt to repair or replace the products within
two (2) months of the receipt of the returned goods.

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Installation Instructions
Step 1 Installation Rules
The following general rules need to be applied to any MC installation. Carel will not take
responsibility for any system installed that does not follow these rules and warranty may be
voided.
1. All atomizing heads on a system must be at the same elevation. Due to the low water pressure
involved, a deviation in elevation of heads of more than 3 inches may be enough to cause the lower
heads to spray heavy while the higher heads don’t spray at all.
2. Keep minimum pressure drops in the air and water piping. Always use minimum 1/2” I.D. water
lines. Use minimum 1/2” I.D. air lines up to 200 lbs/hr in capacity and/or when the total system
layout is less than 100 feet. Use minimum 3/4” I.D. air lines when the system capacity is over 200
lbs/hr and/or they total system layout is more than 100 feet. Avoid excessive use of sharp 90°
elbows (use sweep elbows or 2-45° elbows when possible) - neatness is secondary to function.
NOTE: It is the installer’s responsibility to insure that the air and water lines are sized to
provide proper pressure and volume to the cabinet and then to the atomizing heads.
3. Avoid vertical bends in air and water system piping. These could trap dirt, water or air and
prevent proper blowout of the lines during maintenance.
4. Heads should be mounted above the air and water lines. This insures that sediment and debris
will not flow into the atomizing heads to cause maintenance.
5. Position atomizing heads to avoid direct discharge onto obstructions. As a rule of thumb, the
atomizing heads discharge a plume of mist up to 15 feet long and to 4 feet in diameter. Anything in
this plume has the potential to get wet.
6. Position the heads to allow access for maintenance. Position over aisles or along walls where
access is easy, rather than over equipment and racks.
7. The control cabinet should be located at least 3 feet below the elevation of the atomizing
heads. This is to allow a column of water pressure against the water regulator contained in the
control cabinet to allow controllability.
8. Size the compressor properly. 0.15 CFM per pound of water per hour is required. DO NOT
UNDERSIZE AIR COMPRESSORS. The system cabinets should be fed with a minimum of 100 psi
compressed air. Internal regulators are used to reduce it to the required discharge pressure to the
atomizing heads (30 psi at manifold ends, at full load output conditions).
9. Compressed air must be clean and without oil. Compressor after cooler, moisture separator
and trap, and 0.1 micron coalescing filter are the minimum requirements. Oil from compressed air
will cause excessive maintenance on the atomizing heads, causing a premature buildup of mineral
around the water nozzle tip and in the front air orifice of the atomizing heads, blocking air flow and
causing a heavy spray.
10. Insure proper water supply. 20 psi to the cabinet is the recommended minimum (100 psi
maximum). If water lines are old, steel, or galvanized, then a water filter is required prior to the
control cabinet. NEVER use steel or galvanized pipe within the system.

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Step 2 Assemble atomizing head assemblies
Assemblies are shipped preassembled except for connection of the plastic water lines. The
supporting air and water lines, and tees are supplied by the installer. All threaded fittings on the
head assemblies for air and water are 1/4” MPT.
Single Head Assembly
Double Head Assembly

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Step 3 Plan system layout (assistance is available from Carel USA)
First, determine where the atomizing heads can be best located to maintain necessary clearances
per the following diagrams. The atomizing heads may be located along a wall with all heads
discharging in the same direction,
or down the center of the building with every other head discharging in opposite directions,
NOTE: The installer is responsible for the final position of the atomizing assemblies.
Assemblies may have to be moved after startup if obstructions do not allow clear
discharge.

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or double head assemblies discharging in the same direction (or with every other head opposite).
The entire system layout then should resemble the following:
NOTE: WATER LINES MUST BE PVC OR SS WITH
AGGRESSIVE WATER
1/2" AIR LINES (200 lbs/hr OR LESS)
3/4" AIR LINES (OVER 200 lbs/hr)
NOTE: You can feed the system from the end when the capacity is under 200 lbs/hr and shorter
than 100 feet in length. Over 200 lbs/hr or longer than 100 feet, feed from the center as shown.

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Step 4 Mount the cabinet
The control cabinet should be mounted to a solid surface at a convenient height. However, the
cabinet should not be located above the atomizing heads. Optimum installation is with the control
cabinet at least 3 feet or more below the atomizing heads.
Air and water inlet connections are on the left side of the cabinet, outlet connections on the right,
so leave at least 2 feet clearance on both sides for these.
Cabinet must be mounted level and indoors. Minimum temperature = 40°F, maximum temperature
and humidity = 120°F and 85%RH noncondensing.
Dimensions and mounting holes for the cabinets are as follows.
2.500
15.000
21.752 Ø1.625
Ø2.313
Ø1.625
2.375
5.750
9.750
Ø1.625
Ø1.625
9.750
2.375
1.937
Ø0.870
3/8 Electrical
Knockout X 2
1.500
2.500
3.500
Ø0.870
3/8 Electrical
Knockout
(On Top)
1.500
3.500
2.500
2.312
20.000
2.500
1.813
24.000
SEE DWG. 10034 FOR
KEY HOLE DETAIL
0.750
Ø0.376 X 2
2.500
2.312
1.937
1.250
Ø0.376
Ø0.625
KEY HOLE DETAIL

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Step 5 Connect air and water
The air and water ball valves shown at right are
supplied loose with the cabinet. Solder a piece of 1/2”
copper tube (no longer then 2’) to the 1/2” ball valve
(supplied). Slip tube in top hole and 5/8” compression
fitting then tighten. Cement a piece of 1/2’ schedule 80
PVC pipe (no longer then 2’) to the 1/2” union PVC ball
valve (supplied). Slip pipe in bottom hole and cement to
the union fitting in cabinet.
On the inlet side (left), the top connection is for air,
bottom one is for water. On the outlet side (right) the middle connection is the drain.
Use 1/2” water lines to feed the cabinet and from the cabinet to the atomizing manifold.
Use 1/2” air lines when the system is under 200 lbs/hr and the piping distance is less than 100
feet. Use 3/4” air lines when the system is over 200 lbs/hr and/or the piping distance is longer
than 100 feet. If the piping has excessive elbows and is more than 100 feet, then use 1” air lines.
NOTE: Use two (2) wrenches on all fittings to prevent twisting of the fittings inside the
cabinet, which can cause them to leak.
NOTE: It is the installer’s responsibility to size the air and water lines to minimize the
pressure drop and provide 100 psi air and 20 psi water minimum to the cabinet in sufficient
volume for system operation.
Step 6 Connect electric power
In the top of the cabinet are the electrical connections. Connect 110 VAC to terminals 1 and 2
and the ground wire to the green and yellow ground terminal. Cabinet requires a 5 Amp service.
The terminals have knife blade disconnects. The power transformer has an internal circuit
breaker.
Power transformer
Circuit breaker reset
Power terminals with
knife switches
Control wiring terminals

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Step 7 Mount and wire sensors & safeties
Master control cabinet wiring The control humidity sensor is located in
the room.
The hi-limit humidity sensor is not used.
The airflow switch is not used.
Terminals 29 - 32 are connected to a
SPDT relay. Terminals 30 & 32 are the
common of the relay.
Compressor/water treatment enable is a
SPST relay.
Water treatment and compressor failure
alarms need to come from a dry contact.
24 VAC provided by the MC cabinet (#16).
Carel NTC sensors do not have polarity.
DDC input control signal
Remote on/off input needs to come from
dry contacts. 24 VAC provided by the MC
cabinet (#4). If a remote on/off device is
not used, then a jumper must be placed
across terminals 3 & 4.
Wire all power and controls according to
local and national electrical codes. Wire
the control cabinets according to the
wiring diagrams supplied with the cabinets
themselves. Wiring diagrams in this
manual are for reference only.
DPWC Wall Humidity Sensors
Model
Description
Humidity: Thin film capacitor
Linear 0-1 Vdc or 4-20 mAdc from 10 to 90%RH
Accuracy: +- 3%RH from 20 to 90%RH
calibrated at 55%RH and 25°C (77°F)
+- 5%RH above 90%RH and below 20%RH
Response time: 60 seconds
Power: 12 to 24 Vac/dc or +12 to –12 Vdc
Housing: Wall: ABS with glass fiber fill
Certifications: Calibrated to NIST traceable
humidity/temperature standard, CE Approved
Humidity (0-1 VDC or 4-20 mADC)
DPWC111000
Wall Humidity sensor (replaces ASWH100000 and SHWOOP)
24 Vac16
AS*H100000
REMOTE ON/OFF
- OUTSIDE AIR
COMPRESSOR FAILURE
3
1
2
G
10
6
5
4
9
8
7
13
11
12
14
15
NEUTRAL
110 Vac
GROUND
24 Vac
+ OUTSIDE AIR
- CONTROL SIGNAL
+ CONTROL SIGNAL
+Vdc (+G)
OUT H
MCONTROL HUMIDITY SENSOR
NC
WATER TREATMENT FAILURE
COMPRESSOR / WATER TREATMENT ENABLE
29
23
17
18
19
21
20
22
26
24
25
27
28
31
30
NO
NO ALARM
NC ALARM
32
GND
NC
NC
FIELD WIRING
CAREL NTC SENSOR

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Step 8Installation Checklist
The following checklist should be reviewed BEFORE contacting your CAREL representative for
system start-up:
_____ 1. Proper electric power is connected to the control cabinet. Controls light when power
is turned on by the on/off switch.
_____ 2. All plumbing connections are complete and tested for leaks. NOTE: Flush air &
water lines before cabinet. All manifolds are supplied pretested and cleaned. DO
NOT flush manifolds through the cabinet.
_____ 3. All sensors are installed and connected. Wiring tested by turning on power by the
on/off switch on the control cabinet and verifying proper humidity readouts.
_____ 4. All computer and/or DDC wiring is completed to the control cabinet and the signal is
verified.
_____ 5. Air compressor is installed and has been started up. The compressor has a
minimum of an aftercooler, moisture separator and trap, and a 0.1 micron coalescing
filter. (Oil in the heads will degrade performance and drastically increase
maintenance.) Check compressor size - should be sized to deliver 0.15 CFM per
lbs/hr of capacity.
_____ 6. Drain from cabinet is connected to an open drain and looped to height of nozzles or
no more than 6” below supporting water line.
_____ 7. All air and water lines and manifolds are terminated with removable plugs. Air
gauge on end of air line.
_____ 8. All atomizing heads are connected to the air and water manifolds properly. Verify air
to air and water to water.
_____ 9. Installation, plumbing and wiring matches layout drawings and specifications.
_____ 10. Supply water is connected and available. Water treatment system has been started.
Checklist checked by: ______________ Date checked: ____________________
NOTE: The above checklist MUST be returned before factory startup is begun. If any of the
above items are found not to be ready at time of startup, a second startup charge may be
assessed.

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Step 9 Startup Procedures
You will need: A VAC/VDC multimeter, a set of wrenches, a flat blade screwdriver, and a rag and bucket.
Close all atomizing head air and water valves. It is extremely important that no dirt gets into the atomizing
heads during startup.
Clean main air and water supply lines to the control cabinet. With the air and water shut off at their source,
break the unions on the intake side of the control cabinet. Put on safety glasses. Place a cloth over the open ends of
both the air and water lines to catch any flying debris. Slowly open the air and water valves respectively and bleed the
lines until all dirt has been removed.
Clean all air and water manifolds. Turn on the system power at the control cabinet and activate the system. To
activate the system, go to the Technician’s Menu by pressing the PRG button. Select “MANUAL CONTROL”. Enter
100% in the manual control screen by pressing ENTER, DOWN once, and ENTER again. Adjust air pressure to 30
psi, and water pressure to 5 psi to the manifold. Place a cloth over the open ends of both the air and water lines to
catch any flying debris. Slowly open the air and water ball valves and bleed the lines until all dirt has been removed
from both lines and all air is out of the water lines. Shut off the system at the cabinet.
Open all valves at the heads. With the system OFF, open all valves at the heads.
Start the system. With power to the system, go to the Technician’s Menu by pressing the PRG button. Select
“MANUAL CONTROL”. Enter 100% in the manual control screen by pressing ENTER, DOWN once, and ENTER
again. Once the modulating valve has fully opened, adjust the air pressure to 30 psi at the end of the air manifold,
note the cabinet pressure reading. Adjust the water pressure until you see visible spray out of each nozzle, note the
cabinet pressure reading. The water pressure may be adjusted up or down slightly to achieve the heaviest spray
possible without wetting items near the heads. Turn off Manual Control and return to automatic control.
Air regulator
Modulating air valve
Drain solenoid
Water regulator
Water feed solenoid
Set in final setpoints. See “Operating the MC controls following.
STARTUP IS COMPLETE - REFER TO OPERATING INSTRUCTIONS.

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Operating the MC controls
The MC system uses the very latest Carel controls technology known as the pCO2 programmable
controller. There is a backlit, 4 line by 20 character display and 6 user interface buttons.
Keyboard COMMANDS
Button
Description
ESC
Escapes to previous screen-loop. When already in the Technician’s Menu,
pressing ESC takes you to the main status screen.
If ESC’s green LED is blinking, part of the system is under “Manual Control.”
PROGRAM
Shortcut to the Technician’s Menu, where all application settings can be
reached. If protected, a password will need to be entered.
ALARM
Turns off the buzzer and displays the first alarm screen in the alarm-loop.
A red LED located under the Alarm button will be energized when there are
alarms present. If the red LED is blinking, that means an alarm has occurred,
but the condition has been corrected and the alarm can now be reset.
UP
Cycles upward through the screens, when cursor is in top left corner. When
cursor is in a field, the value of the field is increased. The longer the button is
held, the faster the value increases.
DOWN
Cycles downward through the screens, when cursor is in top left corner. When
cursor is in a field, the value of the field is decreased. The longer the button is
held, the faster the value decreases.
ENTER
Cycles through fields in a screen. When in a field, pressing ENTER confirms the
current value into the field and goes to the next field.
+
UP + DOWN
Shortcut to quickly see the Software Application’s Version Number and Date.
It is in this screen from which you can restore the Factory Settings, by pressing
, then , then , and finally one last time.
+
ESC + PRG
Shortcut to quickly see the System Type and Number of Humidification Stages.
When in the Alarm History Screen, pressing ESC+PRG will erase the history.
+
ESC +
ALARM
Keyboard shortcut to reset all Manually controlled points to Automatic control.
When in the System Run Hours screens, pressing these keys will reset the
currently selected Stage’s Run Hours.

Installation, Operation, Maintenance Manual
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NOTE: The standard MC display will have fields that can display values or accept values. Values
that are read only are preceded by a colon (:), ex: “Room: 040.4 %RH” indicates that the 040.4 is
a display only value and cannot be changed. Values that can be changed (such as set points) are
preceded by an arrow (>), ex: “Room> 040.4 %RH” can be changed by entering the field and
using the UP and DOWN buttons.
On initial powerup, the controller will go through a series of self-tests and then activate the
program, bringing up the following series of screens:
1 Initial Power Up
2
3
┌────────────────────┐
│ CAREL │
│ MC Atomizing │
│ Humidifier │
│Ver: 1.02 01/13/04│
└────────────────────┘
┌────────────────────┐
│ MC ATOMIZING │
│System: OFF 100%▪▪▪▪│
│ Room: 040.4 %RH │
│Supply: 040.4 %RH │
└────────────────────┘
┌────────────────────┐
│ Other Inputs │
│ DDC Demand:000.0% │
│Outside Temp:000.0°F│
│ Supply Temp:000.0°F│
└────────────────────┘
This is called the “splash screen”,
which appears on initial power up
only and displays the software
version and date.
You can reaccess this screen at any
time by pressing the UP and DOWN
buttons simultaneously.
This is the main display screen.
It shows the system status - on/off,
modulation % and the 4 blocks
indicate stages on.
Room and supply humidities are also
displayed.
DDC input demand and other
available sensors are displayed in
this screen if they are connected.
All functions are then accessed through the Technician’s Menu which is accessed by pressing the
PROGRAM button, which displays the Technician’s Menu with rolling choices:
The choices are accessed by using
the UP and DOWN buttons to scroll
the choice to the stationary arrow
line.
┌────────────────────┐
│ *TECHNICIANS MENU* │
│ │
│> SYSTEM STATUS │
│ user settings │
│ current alarms │
│ run hours │
│ service settings │
│ factory settings │
│ date / time │
│ manual control │
│ alarm history │
│ communications │
└────────────────────┘
Then press ENTER to make your
selection and go to that next screen.
Pressing ESC will return you to the
main display screen.
The following pages show each of the above menu selections.
NOTE: The screens shown following are comprehensive. Depending on configuration,
some of the items shown following will not appear.
System Status
See the standard screens shown at the top of this page.

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User Settings
(Initial password is 0001)
1 USER SETTINGS
2
3
┌────────────────────┐
│ROOM HUMIDITY SETUP │
│ Setpoint> 050.0 % │
│ Band> 10.0 % │
│Type>Prop Time>010s│
└────────────────────┘
┌────────────────────┐
│SUPPLY HUMID. SETUP │
│ │
│ Setpoint> 090.0 % │
│ Band> 10.0 % │
└────────────────────┘
┌────────────────────┐
│ STAGING SETUP │
│ ON OFF │
│Stage 1>010% >000%│
│Stage 2>035% >025%│
└────────────────────┘
Room humidity setpoint and band
may be changed.
The band is the proportional band
from the set point. In this example,
the system will operate at 49%RH
and reach full output at 40%RH.
Type is Proportional or Proportional +
Integral.
Time is the integral time during which
output is increased to achieve
setpoint.
Supply humidity high limit setpoint
may be changed.
The band is the proportional band
from the setpoint. In this example,
the system will begin modulating
down at 80%RH and will be off at
90%RH.
The point at which the atomizing
stages come on and off within the
proportional band may be changed.
For this example, stage 1 will activate
at 10% of the proportional band or
about 49%RH, shutting off at
50%RH. Stage 2 would activate at
46.5%RH and shut off at 47.5%RH.
4
5
┌────────────────────┐
│ STAGING SETUP │
│ ON OFF │
│Stage 3>060% >050% │
│Stage 4>090% >075% │
└────────────────────┘
┌────────────────────┐
│ OUTSIDE TEMP RESET │
│ Setpoint> 055.0°F │
│ Band> 05.0°F │
│Hum Set Drop>:10.0% │
└────────────────────┘
Stages 3 and 4 on and off points may
be changed.
This screen displays only if the
outside air reset temperature sensor
is installed and activated.
As the outside air temperature drops
below Setpoint, the Room Humidity
Setpoint is automatically reduced by
the Hum Set Drop value to avoid
condensation.

Installation, Operation, Maintenance Manual
17
Current Alarms
1 CURRENT ALARMS
2
3
┌────────────────────┐
│ *** ALARM *** │
│ │
│ ROOM HUMIDITY │
│ SENSOR FAILURE │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ SUPPLY AIR HUMIDITY│
│ SENSOR FAILURE │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ DDC SIGNAL │
│ SENSOR FAILURE │
└────────────────────┘
Check sensor wiring
Check sensor, clean or replace
Check controller input, replace
controller if bad
Check if sensor is getting wet
Check sensor wiring
Check sensor, clean or replace
Check controller input, replace
controller if bad
Check DDC signal
Check DDC wiring & polarity
Check that DDC signal is isolated
Check impedence of DDC input
Check controller input, replace
controller if bad
4
5
6
┌────────────────────┐
│ *** ALARM *** │
│ │
│ OUTSIDE AIR TEMP │
│ SENSOR FAILURE │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ SUPPLY AIR TEMP │
│ SENSOR FAILURE │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ LOSS OF AIRFLOW │
│ │
└────────────────────┘
Check sensor wiring
Check sensor, clean or replace
Check controller input, replace
controller if bad
Check sensor wiring
Check sensor, clean or replace
Check controller input, replace
controller if bad
On loss of air flow, system shuts
down. System will restart when air
flow is restored.
Check air flow switch, adjust
Check wiring - switch should
open on air flow loss
Check digital input on controller,
replace controller if bad
7
8
9
┌────────────────────┐
│ *** ALARM *** │
│ │
│ COMPRESSOR FAILURE │
│ │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ WATER TREATMENT │
│ FAILURE │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ HIGH ROOM HUMIDITY │
│ │
└────────────────────┘
Compressor has failed. System will
not operate.
Consult compressor manuals
and contact compressor
technical support
Water treatment system has failed.
System will not operate.
Consult water treatment manuals
and contact water treatment
technical support
Room humidity has exceeded the
high limit alarm set point.

10
11
12
┌────────────────────┐
│ *** ALARM *** │
│ │
│ LOW ROOM HUMIDITY │
│ │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ HIGH SUPPLY AIR │
│ HUMIDITY │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ LOW SUPPLY AIR │
│ HUMIDITY │
└────────────────────┘
Room humidity has fallen below the
low limit alarm set point. System will
still run.
Check if the system is operating
correctly
Look for openings in the room
that could leak humidity
Check sensor calibration
Supply air humidity has exceeded the
high limit alarm set point. System
should be off.
Make sure alarm set point is
higher than the supply set point
Check sensor calibration
Set alarm set point higher if too
low
Supply air humidity is below the low
supply air humidity alarm set point.
If initial startup - wait
Check if system is operating
correctly
Check sensor calibration

MC room modulating
18
13
14
15
┌────────────────────┐
│ *** ALARM *** │
│ │
│ HIGH CUSTOMER │
│ SENSOR READING │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ LOW CUSTOMER │
│ SENSOR READING │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ MAINTENANCE │
│ STAGE 1 │
└────────────────────┘
Check sensor calibration
Set alarm set point higher if too
low
Check sensor calibration
Set alarm set point lower if too
high
Indicates that this humidification
stage has exceeded its maintenance
alarm run hours.
Perform maintenance
Reset maintenance alarm
16
17
18
┌────────────────────┐
│ *** ALARM *** │
│ │
│ MAINTENANCE │
│ STAGE 2 │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ MAINTENANCE │
│ STAGE 3 │
└────────────────────┘
┌────────────────────┐
│ *** ALARM *** │
│ │
│ MAINTENANCE │
│ STAGE 4 │
└────────────────────┘
Indicates that this humidification
stage has exceeded its maintenance
alarm run hours.
Perform maintenance
Reset maintenance alarm
Indicates that this humidification
stage has exceeded its maintenance
alarm run hours.
Perform maintenance
Reset maintenance alarm
Indicates that this humidification
stage has exceeded its maintenance
alarm run hours.
Perform maintenance
Reset maintenance alarm
19
┌────────────────────┐
│ NO MORE ALARMS │
│ │
│Press DOWN to Repeat│
│Press ENTER to Clear│
└────────────────────┘
End of the alarm screen loop.
Pressing ENTER will clear and reset
the alarms. Alarms still present will
then repeat.

Installation, Operation, Maintenance Manual
19
Run Hours
1 RUN HOURS
2
3
┌────────────────────┐
│ SYSTEM RUN HOURS │
│ Stage 1> 00000 hr│
│ Alarm set> 1000 hr│
│Next alarm> 1000 hr│
└────────────────────┘
┌────────────────────┐
│ SYSTEM RUN HOURS │
│ Stage 2> 00000 hr│
│ Alarm set> 1000 hr│
│Next alarm> 1000 hr│
└────────────────────┘
┌────────────────────┐
│ SYSTEM RUN HOURS │
│ Stage 3> 00000 hr│
│ Alarm set> 1000 hr│
│Next alarm> 1000 hr│
└────────────────────┘
Stage run hours are shown, as well
as the maintenance alarm set point
and the time to the next alarm.
Pressing ALARM + ESC at the same
time will reset the Stage Run Hours.
Pressing ESC + PRG while the Alarm
Set is selected will reset the Next
Alarm remaining time.
Stage run hours are shown, as well
as the maintenance alarm set point
and the time to the next alarm.
Pressing ALARM + ESC at the same
time will reset the Stage Run Hours.
Pressing ESC + PRG while the Alarm
Set is selected will reset the Next
Alarm remaining time.
Stage run hours are shown, as well
as the maintenance alarm set point
and the time to the next alarm.
Pressing ALARM + ESC at the same
time will reset the Stage Run Hours.
Pressing ESC + PRG while the Alarm
Set is selected will reset the Next
Alarm remaining time.
4
┌────────────────────┐
│ SYSTEM RUN HOURS │
│Stage 4> 00000 hr│
│ Alarm set> 1000 hr│
│Next alarm> 1000 hr│
└────────────────────┘
Stage run hours are shown, as well
as the maintenance alarm set point
and the time to the next alarm.
Pressing ALARM + ESC at the same
time will reset the Stage Run Hours.
Pressing ESC + PRG while the Alarm
Set is selected will reset the Next
Alarm remaining time.

MC room modulating
20
Service Settings
(Initial password is 0001)
1 SERVICE SETTINGS
2
3
┌────────────────────┐
│ SENSOR FAIL ALARMS │
│ ENABLE DELAY│
│ Room Hum>YES >010s│
│Supply Hum>YES >010s│
└────────────────────┘
┌────────────────────┐
│ SENSOR FAIL ALARMS │
│ ENABLE DELAY│
│ Out Temp>YES >010s│
│Supply Tmp>YES >010s│
└────────────────────┘
┌────────────────────┐
│ SENSOR FAIL ALARMS │
│ ENABLE DELAY│
│DDC Demand>YES >010s│
│ │
└────────────────────┘
For each sensor connected, set
ENABLE to Yes to enable the alarm
and enter alarm delay time.
For each sensor connected, set
ENABLE to Yes to enable the alarm
and enter alarm delay time.
For each sensor connected, set
ENABLE to Yes to enable the alarm
and enter alarm delay time.
4
5
6
┌────────────────────┐
│ WARNING ALARMS │
│ Room Humidity │
│ High> 065.0 %RH │
│ Low> 035.0 %RH │
└────────────────────┘
┌────────────────────┐
│ WARNING ALARMS │
│ Supply Humidity │
│ High> 095.0 %RH │
│ Low> 040.0 %RH │
└────────────────────┘
┌────────────────────┐
│ WARNING ALARMS │
│ Customer Sensor │
│ High> 075.0 %RH │
│ Low> 025.0 %RH │
└────────────────────┘
Set high and low set points for alarm.
Set high and low set points for alarm.
Set high and low set points for alarm.
7
8
9
┌────────────────────┐
│ SENSOR CALIBRATION │
│ Room Humidity │
│ Offset> 00.0 %RH │
│ Actual> 000.0 %RH │
└────────────────────┘
┌────────────────────┐
│ SENSOR CALIBRATION │
│ Supply Air Humidity│
│ Offset> 00.0 %RH │
│ Actual> 000.0 %RH │
└────────────────────┘
┌────────────────────┐
│ SENSOR CALIBRATION │
│ DDC Demand Signal │
│ Offset> 00.0 % │
│ Actual> 000.0 % │
└────────────────────┘
Sensor calibration.
The Actual reading is the raw sensor
input.
Calibrate by entering a + or - value to
the Offset. This is then added to the
Actual value to provide the displayed
value which is also used for control.
Sensor calibration.
The Actual reading is the raw sensor
input.
Calibrate by entering a + or - value to
the Offset. This is then added to the
Actual value to provide the displayed
value which is also used for control.
Sensor calibration.
The Actual reading is the raw sensor
input.
Calibrate by entering a + or - value to
the Offset. This is then added to the
Actual value to provide the displayed
value which is also used for control.
10
11
12
┌────────────────────┐
│ SENSOR CALIBRATION │
│ Outside Air Temp │
│ Offset> 00.0 °F │
│ Actual> 000.0 °F │
└────────────────────┘
┌────────────────────┐
│ SENSOR CALIBRATION │
│ Supply Air Temp │
│ Offset> 00.0 °F │
│ Actual> 000.0 °F │
└────────────────────┘
┌────────────────────┐
│ STAGING DELAYS │
│Time Between> 000 s │
│ Min On Time> 010 s │
│Min Off Time> 010 s │
└────────────────────┘
Sensor calibration.
The Actual reading is the raw sensor
input.
Calibrate by entering a + or - value to
the Offset. This is then added to the
Actual value to provide the displayed
value which is also used for control.
Sensor calibration.
The Actual reading is the raw sensor
input.
Calibrate by entering a + or - value to
the Offset. This is then added to the
Actual value to provide the displayed
value which is also used for control.
To prevent the humidification stages
from short cycling, there should be a
time delay between stages and then
a minimum on and off time for all
stages.