Munters R Series Operating instructions

6.5.2020
OPERATING AND MAINTENANCE MANUAL
MODEL: R SERIES
Section 1
a) Operating and Maintenance Instructions................................................................I27028 R2
Section 2
a) Flow Diagram .......................................................................................................I20694 R1
b) General Arrangement Drawing R05.......................................................................88093 R4
c) General Arrangement Drawing R10.......................................................................88094 R4
d) General Arrangement Drawing R15.......................................................................88142 R1
Section 3
a) Wiring Diagram R05 Dual Reactivation, 460V............................................... K51525-01 R7
b) Wiring Diagram R10 Dual Reactivation, 460V............................................... K51526-01 R7
c) Wiring Diagram R15 Dual Reactivation, 460V............................................. K51527-01 R10
Section 4
a) Process Fan Curve –R05
b) Reactivation Fan Curve –R05
c) Process Fan Curve –R10
d) Reactivation Fan Curve –R10
e) Process fan Curve –R15
f) Reactivation Fan Curve –R15
Section 5
a) Spare Parts List R05................................................................................................... 21791
b) Spare Parts List R10................................................................................................... 21792
c) Spare Parts List R15................................................................................................... 21793
Section 6
a) Rigging Diagram.....................................................................................................I27080-01 R0

6.5.2020
Revision Changes:
6-5-2020:
Wiring Diagrams updated (K51525-01 now Rev 7 and K51527-01 now Rev 10)

PROTECTING
YOUR
INVESTMENT
As with all machinery,
continuation of long term,
satisfactory operation can
be best assured by regular
servicing.
To help you achieve this,
Munters Service has
developed a range of
service options that will
meet all your needs.
9/8/99
REPLACEMENT PARTS
Munters prides itself on being able to quickly respond to customer
requests for spare parts, whether the part is for a unit one year old or
twenty years old. All Munters manufactured parts carry a full one-year
warranty, guaranteeing that they will be free from defects and provide
you with the continued performance that you expect from your
dehumidifier. All vendor-supplied parts are manufactured to Munter’s
exacting specifications.
Days: 1-888-DHWheel 8am - 5 pm EST - ASK FOR PARTS
(1-888-349-4335)
SERVICING PROGRAMS
Regular preventive maintenance servicing is vital to maximizing
equipment efficiency and longevity, and reducing unscheduled down-
time. Your in-house maintenance personnel may not be familiar with
some of the technical aspects required to ensure peak efficiency, such as
performance monitoring and adjustment, and psychometric analysis.
Periodic visits by an experienced Munters technician to ensure optimum
performance may be the answer. A preventive maintenance service
program is available on all Munters units - new and used. Our service
programs are customized to your requirements with one to twelve visits
annually. Parts or additional service needed for equipment under a
service agreement are provided for at a discounted rate. If your situation
is unique, we can design a service program specifically to match your
requirements.
For more information contact: 1-888-DHWheel (1-888-349-4335)
TECHNICAL SUPPORT
At any time should you experience a mechanical or operational problem,
whether or not the equipment is still in warranty, you can obtain
telephone support from our technical staff to assist you in understanding
or troubleshooting the problem, 24 hours a day.
Days: 1-888-DHWheel 8am - 5pm EST - ASK FOR TROUBLESHOOTING
(1-888-349-4335)
EMERGENCY SERVICE
Downtime is costly …. Munters can help you minimize unscheduled
downtime and reduce production losses by providing quick response to
your service requirements from one of our fourteen regional offices
located throughout the United States and Canada. Munters factory-
trained Field Service Technicians are ready to respond to your needs.
Days: 1-888-DHWheel 8am - 5 pm EST
Nights: 1-978-372-9782 5pm - 8am EST
Munters Corporation
79 Monroe Street, P.O. Box 640, Amesbury, MA 01913 U.S.A. •TEL: [phone] or 1-800-843-5360
Web Address: www.munters.us Email: [email protected]

Manual# I27028 Rev. 2 -11/22/2017
MODEL R-Series
DEHUMIDIFIERS
with Electric & Direct Fired Gas Reactivation
Units with Siemens
Pr ogrammable Logic
Contr
oller
R-5000 unit shown

Manual# I27028 Rev. 2 -11/22/2017

Manual# I27028 iRev. 2 – 11/22/2017
TABLE OF CONTENTS
CHAPTER 1 – REVISION HISTORY................................................................................................. iii
CHAPTER 2 – INTRODUCTION.....................................................................................................1-1
CHAPTER 3 – SAFETY NOTES .....................................................................................................2-1
CHAPTER 4 – PRINCIPLES OF OPERATION...............................................................................3-1
3.1 Dehumidifier Operating Principle .........................................................................................3-1
3.2 About the R-Series Units......................................................................................................3-3
3.3 Control System and Power Distribution...............................................................................3-7
3.4 Energy Modulation...............................................................................................................3-7
CHAPTER 5 - INSTALLATION........................................................................................................4-1
4.1 Inspection.............................................................................................................................4-1
4.2 Lifting the unit.......................................................................................................................4-1
4.3 Stacking the units (cage option only)...................................................................................4-1
4.4 Positioning the Unit..............................................................................................................4-1
4.5 Connecting the Ductwork.....................................................................................................4-3
4.6 Gas Connections..................................................................................................................4-5
4.7 Electrical Connections..........................................................................................................4-6
4.8 Connecting a Remote Humidistat (OPTIONAL) ..................................................................4-7
CHAPTER 6 - OPERATING INSTRUCTIONS ................................................................................5-1
5.1 Controls and Indicators........................................................................................................5-1
5.2 Starting the Unit ...................................................................................................................5-2
5.3 Adjusting the Process and Reactivation Dampers...............................................................5-3
5.4 Adjusting the Process BYPASS Damper (R15 ONLY)........................................................5-4
5.5 Final Checks ........................................................................................................................5-4
5.6 Reacting to Alarms...............................................................................................................5-4
5.7 Stopping the Unit..................................................................................................................5-5
5.8 Long-Term Shutdown...........................................................................................................5-6
5.9 HMI (OPTION) .....................................................................................................................5-6
CHAPTER 7 - MAINTENANCE .......................................................................................................6-1
6.1 Quick Maintenance Check...................................................................................................6-1
6.2 Suggested Maintenance Schedule......................................................................................6-1
6.3 Checking the Reactivation Outlet Temperature...................................................................6-2
6.4 Cleaning the Air Filters.........................................................................................................6-2
6.5 Removing and Replacing the HoneyCombe®Wheel...........................................................6-3
6.6 Inspecting the HoneyCombe®Wheel...................................................................................6-4
6.7 Cleaning the HoneyCombe®Wheel.....................................................................................6-5
6.8 Inspecting the Seals.............................................................................................................6-6
6.9 Changing the Seals..............................................................................................................6-6
6.10 Inspecting the Blower Fans..................................................................................................6-7
6.11 Inspecting the Roller Wheels ...............................................................................................6-7
6.12 Inspecting the Electronic Controls .......................................................................................6-8
6.13 Inspecting the Wheel Drive Motor (CHAIN DRIVE SYSTEMS)...........................................6-8
6.14 Inspecting and Maintaining the Chain..................................................................................6-9
6.15 Inspecting the Wheel Drive Motor AND BELT (BELT DRIVE SYSTEMS)........................6-10
6.16 Checking the Humidistat (Optional)...................................................................................6-10
6.17 Burner Adjustment Procedure............................................................................................6-11
6.18 Checking the Flame Rod....................................................................................................6-17
6.19 Checking the Spark Plug....................................................................................................6-17
6.20 Storage and Long-Term Shut-Down..................................................................................6-17

Manual# I27028 ii Rev. 2 – 11/22/2017
CHAPTER 8 - TROUBLESHOOTING .............................................................................................7-1
7.1 Troubleshooting Guide.........................................................................................................7-2
7.2 Checking the Power Distribution System.............................................................................7-5
7.3 Checking the Heating Elements...........................................................................................7-5
7.4 Checking the Gas Modulation Valve....................................................................................7-6
7.5 Checking the Airflow Switch.................................................................................................7-6
7.6 Checking the High Temperature Limit Switch......................................................................7-6
7.7 Checking the Flame Rod Sensor.........................................................................................7-7
7.8 Checking the Humidistat (Optional).....................................................................................7-7
7.9 Checking the Thermocouples ..............................................................................................7-7
7.10 Troubleshooting Using the PLC...........................................................................................7-7
7.11 Terminal Block Wiring Instructions.....................................................................................7-10

Manual# I27028 iii Rev. 2 – 11/22/2017
REVISION HISTORY
REV DATE REASON FOR CHANGE APPROVED
BY
1 05/15 R15 model added AMcD
2 011/17 Model numbers updated. Gas train images
updated. HMI option added AMcD

Manual# I27028 1-1 Rev. 2 – 11/22/2017
1 - INTRODUCTION
The engineers at Munters have designed the HoneyCombe®dehumidifier using state-
of-the-art technology. The unit is durable, simple to operate, and needs very little
maintenance.
The R-Series unit can provide years of trouble-free service when the recommendations
listed in this manual are followed. It is strongly recommended that this entire manual is
read prior to operating the equipment. The manual describes how the dehumidifier works,
and how to get the best service from the unit. While a Munters dehumidifier is easy to
operate, it is a bit different from most air handling equipment.
The R-Series unit includes a heater which is used to remove moisture from the unit. (The
heater is used to “reactivate” the material in the R-Series unit which dries the air.) The R-
Series units described in this manual have electric and direct fired gas reactivation.
Figure 1-1 shows a typical unit.
Figure 1-1
R-5000 UNIT WITH ELECTRIC AND DIRECT FIRED
GAS REACTIVATION

Manual# I27028 1-2 Rev. 2 – 11/22/2017
The table below explains the identification system used for the model number:
R X X X - X X X - X X X - X X X
R SERIES
DEHUMIDIFIER MAX SCFM THRU UNIT REACTIVATION TYPE OPERATING VOLTAGE DUCT CONNECTION UNIT CAGE SKID / CAGE FINISH PROCESS FAN SWITCH HUMIDISTAT HMI
05: 5000 SCFM D: Dual Fuel 460: 460V~,
3PH, 60HZ 1: 18” Round 0: No G: Galvanized 0: No 0: No 0: No
10: 10000 SCFM E: Electric Only 575: 575V~,
3PH, 60HZ 2: 20” Round 1: Yes P: Painted 1: Yes 1: Yes 1: Yes
15: 15000 SCFM G: Gas Only
Note: SUFFIXES AER USED TO DESIGNATE FURTHER OPTIONS:
GREY: Grey BELT: Belt Drive C: Modbus TCP Comm Port
SIERRA: Sierra Tan CHN: Chain Drive
Example:
R05D-460-21G-001-SIERRA-BELT-C
R-Series, 5000 SCFM, Dual Fuel, 460V~, 20” connections, cage, galvanized
skid / cage, no process fan switch, no humidistat, HMI, sierra tan paint, belt
drive, with TCP Communication port.
If any part of this manual is not understood, or there is a question concerning the
dehumidifier, call the Service Operations Department of Munters and speak with a
Service Operation Technicians at [phone].

Manual# I27028 2-1 Rev. 2 – 11/22/2017
2 - SAFETY NOTES
Munters is concerned about the safety of anyone who uses or services the R-Series
unit. Some of the parts inside the R-Series unit can be dangerous if an untrained
person tries to service the unit. Throughout this manual, hazards are pointed out which
may occur in the use of the R-Series unit. Precautions are also listed which should be
taken to avoid these hazards.
In this manual, different kinds of messages are used to warn of possible hazards:
Immediate hazard which will result in severe personal injury or
death.
Hazard or unsafe practice which may result in severe personal
injury or death.
Hazard or unsafe practice which could result in minor personal
injury or property damage.
Hazard or unsafe practice which will not result in personal
injury, but could result in property damage.
Please keep these points in mind while using or servicing the unit:
The R-Series unit may be wired for up to 575V AC. The unit
can produce enough voltage and current to cause serious
injury or death. Always turn off and lock out the power before
working inside the unit. Only trained electricians should
perform work with the electrical parts.
The blowers inside the R-Series unit spin at a high rate of
speed. Hands may be badly hurt if put inside the blower
while it is turning. Keep hands away from the blowers while
the unit is turned on. Before working with the machine, allow
enough time for the blowers to come to a complete stop.
The wheel used in a larger R-Series unit can weigh
several hundred pounds. Never attempt to lift the wheel
without help from a second person. It is usually easier to
roll the wheel. When working near the wheel when it is
inside the unit, and the wheel is propped up, use blocks to
prevent the wheel from moving accidentally.
Units designed for outdoor use are not waterproof and
weatherproof unless all covers are secured in place.
During normal operation, do not run the unit with the access
panels removed. This can allow moist air to reach parts of
the machine which should be dry.

Manual# I27028 2-2 Rev. 2 – 11/22/2017
Do not use any kind of filter coating on the reactivation inlet
filter. This filter is located just upstream of the electric
heating elements. Some filter coatings give off volatile
chemicals, which could be pulled into the heating elements.
This could create a fire hazard. (If a filter is installed in the
process air duct, it is OK to use filter coating on this filter.
The process air is not pulled through the heating elements.)
The electric heaters and the solid state power controllers
are mounted in an electrical control enclosure. These
parts may carry high voltages from 460 to 575V AC.
Only trained electricians should perform work on these
parts.
On a unit with gas reactivation, take the normal
precautions you would take with any gas appliance.
Leaking gas can be explosive if it is allowed to collect. In
the presence of a gas odor:
• Open the windows.
• Don’t touch any electrical switches.
• Extinguish any open flames. Shut off the gas valves to the
heater in the R-Series unit.
• Call your gas supplier immediately.
Do not store gasoline or other flammable vapors and
liquids in open containers near this appliance. Direct-fired
burner units may include an open pilot flame which may
ignite flammable vapors.
Any unit which contains a gas flame can generate carbon
monoxide gas under certain circumstances. This can
happen if the flow of air to the flame is blocked, and the
flame cannot burn normally. Carbon monoxide is a
colorless, odorless gas which can be deadly in high
concentrations. Take particular care when setting up the
exhaust for these units. Once a unit has been set up
correctly, be careful not to make changes which could re-
strict the air flow. When the gas is burning correctly, it
produces a strong blue flame with small yellow tips. If the
air flow is restricted, it produces a smoky blue flame which
appears to be “lazy.”
Do not use any filter coating on the reactivation air filter.
This presents a possible fire hazard.
Do not use the unit to process air which contains solvents
or flammable vapors.
PLEASE READ THIS ENTIRE MANUAL. PLEASE FOLLOW THE INSTRUCTIONS
CAREFULLY AND COMPLETELY. PLEASE PAY PARTICULAR ATTENTION TO THE
SAFETY INSTRUCTIONS AND PRECAUTIONS.

Manual# I27028 3-1 Rev. 2 – 11/22/2017
3 - PRINCIPLES OF OPERATION
3.1 DEHUMIDIFIER OPERATING PRINCIPLE
Figure 3-1 shows how the R-Series unit removes moisture from the air. The “heart” of
the system is the HoneyCombe
®
wheel. The detail in Figure 3-1 shows how this wheel
is made. The wheel has a series of air passages or channels arranged in a
honeycomb pattern. Air can be forced through these channels in either direction.
The passages inside the wheel are impregnated with a special substance called a
“desiccant.” When this substance comes into contact with damp air, it soaks up moisture.
When the desiccant is heated, it releases the moisture. Figure 3-2 shows how this
principle is used in the R-Series unit. An example is using the R-Series unit to dry the air
in a storage room. Damp “process” air is pulled into the unit from the storage room. This
air is drawn through the channels in the HoneyCombe
®
wheel, as shown in the detail.
The desiccant picks up most of the moisture in the air. Once it has been “dried out,” the
process air is ducted back into the storage room. At this point, the moisture has been
taken out of the process air, and “stored” in the HoneyCombe
®
wheel.
The moisture then needs to be removed from the wheel. As previously mentioned, the
desiccant will give up moisture when it is heated. Hot air can hold a large amount of
moisture. When hot air reaches the desiccant, the moisture is released and the
desiccant is “reactivated.” In the R-Series unit, a stream of “reactivation” air is typically
taken from the outdoors and heated. The normal temperature range of the reactivation
air is from 120°to 300°F. Heat input is provided by either the electric heating elements
or the direct fired gas heater.
The heated air is pulled through the channels in the HoneyCombe
®
wheel. The desiccant
releases the moisture into the heated air stream. Finally, the damp reactivation air is
vented outside. At this point, the moisture has been moved from the storage room to the
wheel, then from the wheel into the outside air. The process continues until the R-Series
unit is turned off.
Figure 3-1
DESICCANT DEHUMIDIFIER OPERATING PRINCIPLE
Full contact
to
tw
o
Reactivation
air outlet
(moist)
air
air
(dry
Process
secto
r
air
Detail of
HoneyCombe®wheel
Desiccant
wheel

Manual# I27028 3-2 Rev. 2 – 11/22/2017
Figure 3-2
COMPLETE OPERATING UNIT
Figure 3-1 and Figure 3-2 show that, at one moment, the wheel is being used to pick up
moisture, and a moment later, the wheel is being heated to drive off the moisture. In
the R-Series unit, both actions are happening at the same time, on different sections of
the wheel. All sections of the wheel go through the following cyclic process:
• At the beginning of the process, this section of the wheel is exposed to the damp
“process” air.
• As the wheel turns, this section of the wheel moves under the stream of heated
“reactivation” air. This part of the wheel is then dried out by the heated air.
• Finally, the dried part of the wheel turns into the “process” area again so it can pick
up more moisture.
During this cycle, the wheel does not stop. One side of the wheel is picking up moisture
while the other side is being dried out. The wheel rotates quite slowly – 8 revolutions
per hour.
The HoneyCombe
®
wheel has been carefully designed. The honeycomb material is non-
metallic and does not react to bacteria. The desiccant material used in this model is
shown in the following table:
Desiccant Type
Color Marking
Titanium enhanced silica gel Red Tigel
A wheel using titanium enhanced silica gel depends on the “adsorption” principle. Each
particle of chemical can bond with a large number of water molecules. Each water molecule is
attracted to many sites on the outside of the silica gel molecule. The process can be reversed
within the wheel by adding heat. As the desiccant is heated, it releases water to the air.
air
(dry
Process
sector of
wheel
air
Bypass damper
(
R15 onl
y)
Reactivation
sector of wheel
Drive
Moto
r
Additional
filte
r
Reactivation
Blowe
r
Reactivation
air outlet
(moist)
Reactivation
Heate
r
Filter
Reactivation
air inlet
(
outside air
)
Blower
Desiccant
wheel

Manual# I27028 3-3 Rev. 2 – 11/22/2017
3.2 ABOUT THE R-SERIES UNITS
This is a simplified explanation of the operating principle. Further explanation illustrates
how this principle works in the R-Series unit. Figure 3-3 thru Figure 3-8 show most of the
important parts of the machine: the HoneyCombe®wheel, process air stream and
reactivation air stream. However, additional parts are required for the unit to function.
For example, the R-Series unit has two seals, mounted on the wheel plates on each side
of the HoneyCombe®wheel. These seals separate the two streams of air – the damp
process air, and the heated reactivation air. Notice that the two air streams move through
the R-Series unit in opposite directions (“counter flow”). The HoneyCombe®wheel is
turned by a small drive motor and chain. The drive mechanism is designed to
automatically adjust the chain tension.
The process air is pulled through the wheel by a blower. (Notice that the blower is on the
downstream side of the wheel – it “pulls” rather than “pushes.”) A damper is included
downstream of the blower. By adjusting this damper, the amount of process air moving
through the unit can be changed. This adjustment is important, and it will be discussed
again in the section on “Installation.” A filter is included to keep dirt from the process air
from plugging the wheel.
The reactivation side of the system has some of the same features. The air is pulled
through the wheel by a blower. Again, a damper is included to adjust the reactivation air
flow and a filter to keep the wheel from plugging due to contaminants. Just upstream of
the wheel, the reactivation system includes an electric heater and a direct fired gas
heater. These heaters provide the heat needed to “reactivate” the desiccant. Only one
heat source (electric or gas) is activated at any one time. The gas heat may be provided
by either natural gas or propane fuel.

Manual# I27028 3-4 Rev. 2 – 11/22/2017
Figure 3-3
R05 UNIT – FRONT VIEW
Figure 3-4
R05 UNIT – REAR VIEW
Electric heaters
Ignition control module,
main gas shut-off valve,
and gas modulation valve
Drive motor
(behind cover)
Inspection windo
w
Reactivation blower
Reactivation damper
Control panel
Process blowe
r
Process dampe
r
REACTIVATION
AIR IN
PROCESS
AIR OUT
PROCESS
AIR IN
REACTIVATION
AIR OUT
Direct fired gas burner
Reactivation air
filter access
Process air
filter access
Process and reactivation
pressure gauges
HoneyCombe® wheel
and seals
(behind access panel)

Manual# I27028 3-5 Rev. 2 – 11/22/2017
Figure 3-5
R10 UNIT – FRONT VIEW
Figure 3-6
R10 UNIT – REAR VIEW
Electric heaters
Ignition control
module, main
gas shut-off
valve, and gas
modulation
valve
Drive motor
(behind cover)
Inspection
window
Reactivation
blowe
r
Reactivation
dampe
r
Control panel
Process
blower
(behind cover)
Process
damper
REACTIVATION
AIR IN
PROCESS
AIR OUT
PROCESS
AIR IN
REACTIVATION
AIR OUT
Direct fired gas
burner
Reactivation air
filter access
(behind hinged
panel)
Process air
filter access
Process and
reactivation
pressure
gauges
HoneyCombe®
wheel and
seals
(behind access
panel)

Manual# I27028 3-6 Rev. 2 – 11/22/2017
Figure 3-7
R15 UNIT – FRONT VIEW
Figure 3-8
R15 UNIT – FRONT VIEW
Electric heaters
Ignition control
module, main
gas shut-off
valve, and gas
modulation
valve
Drive motor
(behind cover)
Inspection
window
Reactivation
blowe
r
Reactivation
dampe
r
Process
blower
(behind cover)
Process
damper
REACTIVATION
AIR IN
PROCESS
AIR OUT
PROCESS
AIR IN
REACTIVATION
AIR OUT
Direct fired gas
burner
Reactivation air
filter access
(behind hinged
panel)
Process air
filter access
Process and
reactivation
pressure
gauges
HoneyCombe®
wheel and
seals
(behind access
panel)
Process
bypass
damper

Manual# I27028 3-7 Rev. 2 – 11/22/2017
3.3 CONTROL SYSTEM AND POWER DISTRIBUTION
The R-Series unit is controlled by a “programmable logic controller” or “PLC.” The PLC
is a small computer which executes a simple set of commands or “program.” The
program is organized as a loop which repeats continuously. LEDs on the front of the
PLC show the status of each of the inputs and outputs. For more information on these
LEDs, see the section on “Troubleshooting.”
Different variations of the unit operate on either 460V or 575V three-phase AC power.
The blowers use this voltage. Motor starters are provided for each of the blower motors.
The PLC changes or “modulates” the power going to the heating elements or gas
flowing to the burner, depending on the mode of operation. A transformer provides
115V AC, which is used by the controls and indicators in the unit.
If a blower motor is jammed, it will start to draw a large amount of electrical current. Each
of the motor starters can detect this condition, and shut down the faulty motor
automatically. This will also shut down the rest of the unit. Each motor starter can be
reset by pressing the “Reset” button on the starter.
3.4 ENERGY MODULATION
The reactivation heaters and burners are sized to provide enough heat to remove the
maximum amount of moisture the unit was designed to handle. The R-Series unit is
efficient because the heat input can be changed or “modulated.” The heaters will
always supply enough heat to keep the wheel in “equilibrium.” This means that the
wheel releases moisture at the same rate it is being absorbed. Because the heat input
can be modulated, less energy is used when the moisture load drops.
As the reactivation air passes through the wheel, the air temperature drops (the
moisture “cools off” the reactivation air as it evaporates off the wheel.) Tests have
shown that when the wheel is in equilibrium, the ideal temperature at the reactivation
outlet is 120°F.
There are four factors which affect the temperature at the reactivation outlet:
• Changes in temperature at the reactivation inlet
• Changes in the flow of reactivation air
• Changes in moisture loads in the process air stream
• Changes in the amount of heat provided by the heat source
If the temperature at the reactivation outlet is higher than 120°F, this does not
necessarily indicate a problem. A low outlet temperature indicates a potential problem.
There are four possible causes for a low outlet temperature:
• Large drop in temperature at the reactivation inlet
• Large drop in flow of reactivation air
• Large increase in moisture load in the process air stream
• Reduced output from the reactivation heaters
The controller will issue a warning if the machine operates for over 30 minutes with the
temperature below 110°F.
The reactivation heaters are designed to produce enough heat to handle the full design
moisture load. If the moisture load is less than maximum, the amount of energy input may
be reduced. The amount of energy used is controlled or “modulated” to maintain a

Manual# I27028 3-8 Rev. 2 – 11/22/2017
constant 120°F (R05, R10) and 130°F (R15) at the output of the reactivation air stream.
Less moisture absorbed by the wheel means less evaporative cooling taking place in the
reactivation air stream. This means that less heat is required to maintain the temperature
at the reactivation outlet. Accurate energy modulation saves energy whenever the unit is
handling less than the full load. The reactivation air entering the wheel must never rise
above 350°F. High temperatures can damage the wheel.