Munters HC-300 Operating instructions

OPERATING AND MAINTENANCE MANUAL
MODEL: HC-300 / DEW-300
Section 1
a) Operating and Maintenance Text
Section 2
a) General Arrangement Drawing................................................................................... 74119
b) Wiring Diagram 208-240 /1/ 50/60.............................................................................. 50339
c) Wiring Diagram 208-240 /3/ 50/60.............................................................................. 50340
d) Wiring Diagram 380-415 /3/ 50/60.............................................................................. 50341
e) Wiring Diagram 460 /3/ 50/60..................................................................................... 50342
f) Wiring Diagram 208-240 /3/ 50/60.............................................................................. 50344
Section 3
a) Replacing Fusible Links
b) Humidistat Field Connections..................................................................................... 26992
c) Blastgate Installation Instructions ............................................................................... 27110
d) Recommended Spare Parts List ................................................................................ 21239

OPERATING AND
MAINTENANCE
MANUAL
MODEL HC-300
DEHUMIDIFIER
Rev 6.0 1/21

i
TABLE OF CONTENTS HC-300
SECTION 1 — INTRODUCTION ....................................................................... PAGE 1-1
1.1 DehumidierOperatingPrinciple.................................................................. 1-1
1.2 AbouttheHC-300.......................................................................................... 1-2
1.3 ControlsandIndicators ................................................................................ 1-3
1.4 ProtectiveCircuits ........................................................................................ 1-4
SECTION 2 — SAFETY NOTES .................................................................................. 2-1
SECTION 3 — INSTALLATION AND START-UP ......................................................... 3-1
3.1 Inspection..................................................................................................... 3-1
3.2 PositioningtheUnit ....................................................................................... 3-1
3.3 ConnectingtheDuctwork ............................................................................. 3-3
3.4 ElectricalConnections.................................................................................. 3-6
3.5 ConnectingtheRemoteHumidistat.............................................................. 3-6
3.6 AdjustingtheDampers................................................................................. 3-7
SECTION 4 — PREVENTIVE MAINTENANCE ........................................................... 4-1
4.1 CleantheAirFilters...................................................................................... 4-1
4.2 ChecktheHoneycombeWheel.................................................................... 4-1
4.3 ChecktheUpperandLowerAirSeals ......................................................... 4-1
4.4 ChecktheReactivationOutletTemperature................................................. 4-1
SECTION 5 — TROUBLESHOOTING ......................................................................... 5-1
5.1 PossibleTroubleConditions......................................................................... 5-1
5.2 Auto/Off/ManualSwitchisSettoAuto,
RunningLightDoesNotComeOn............................................................... 5-1
5.3 FaultLightisOn,andMachineShouldBeRunning..................................... 5-1
5.4 ReactivationOutletTemperatureisTooLow................................................. 5-2
5.5 PoorDehumidifyingPerformance ................................................................ 5-3
5.6 HoneyCombeWheelisStopped,RunningLightisOn................................. 5-3
5.7 CheckingtheHeatingElements................................................................... 5-4
5.8 CheckingtheThermistor .............................................................................. 5-4
5.9 CheckingtheHumidistat .............................................................................. 5-5
5.10 CheckingtheDriveMotor,WheelandSeals................................................ 5-5

ii
LIST OF FIGURES
Fig. 1-1 Operating Principle ......................................................................... PAGE 1-1
Fig.1- 2 HC-300 in Operation .................................................................................. 1-2
Fig. 1-3 Controls and Indicators .............................................................................. 1-3
Fig. 1-4 Front View, Cover Open ............................................................................ 1-4
Fig. 3-1 Dimensions ................................................................................................ 3-1
Fig. 3-2 HC-300 Installed in Process Space ........................................................... 3-2
Fig. 3-3 HC-300 Installed Outside of Process Space ............................................. 3-3
Fig. 3-4 HC-300 Installed with Existing Air-Handling Unit ....................................... 3-4
Fig. 3-5 Do Not Install HC-300 This Way ................................................................ 3-5

1-1
1 - INTRODUCTION
Your HC-300 dehumidier is durable, simple to operate, and needs very little mainte-
nance. The HC-300 can give you years of trouble-free service if you follow the recom-
mendations listed in this manual.
We strongly recommended that you read this whole manual. This should not take very
long. In return, you will learn how your dehumidier works, and how to get the best ser-
vice from your unit.
If you do not understand something in this manual, or you have a question about your
dehumidier, please call Munters at [phone] or send a fax to [phone]. Ask
to speak with one of our Technical Support people.
1.1 DEHUMIDIFIER OPERATING PRINCIPLE
Figure 1-1 shows how the HC-300 removes moisture from the air. The heart of the
system is the HoneyCombe® wheel. The detail in Fig. 1-1 shows the structure of the
wheel. As you can see, the wheel has a series of air passages or channels. The pas-
sages inside the wheel are coated with a special substance called a “desiccant.” When
this substance contacts damp air, it soaks up moisture. When the desiccant is heated, it
releases the moisture again.
Let’s say that you want to dry the air in a storage room, using the HC-300. Damp “pro-
cess” air is pulled into the unit from the storage room. The desiccant in the Honey-
Combe® wheel picks up most of the moisture in the air. Once it has been “dried out,” the
process air is vented back into the storage room. At this point, the moisture has been
taken out of the process air, and “stored” in the HoneyCombe® wheel.
FIGURE 1-1
OPERATING PRINCIPLE

1-2
The next job is to move this moisture out of the wheel. As we said, the desiccant will give
up moisture when it is heated. When it is heated, and the moisture released, we say it
is “reactivated.” In the HC-300, a stream of “reactivation” air is taken from outside the
controlled space and heated using an electric heater. This heated air is forced 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 is complete.
You may have noticed that, at one moment, we’re using the wheel to pick up moisture,
and a moment later, we’re heating the wheel to drive off the moisture. In the HC-300,
both actions are happening at the same time, on different sections of the wheel.
1.2 ABOUT THE HC-300
This is a simplied explanation of the operating principle. Figure 1-2 shows how we put
this principle to work in the HC-300. You can still see the parts we discussed in the last
Figure – the HoneyCombe®wheel, process air stream and reactivation air stream. We
have also added a number of other parts:
• Two sets of seals to separate the two streams of air (damp process air and the
heated reactivation air)
• Blower, damper and lter for the process air
• Blower and lter for the reactivation air
• Temperature sensors
• Electric heating elements for the reactivation air
FIGURE 1-2 - HC-300 IN OPERATION
Desiccant wheel
Heater
Filter
Process
air outlet
(dry air)
Blower
Drive
motor
Process air inlet
(moist)
Reactivation
blower
Reactivation
air outlet
(moist)
Temperature
sensor
TS02
Reactivation
sector of wheel
Process air
damper
Process
sector of wheel
Filter
Overheating
sensor
TS01
Reactivation air
temperature sensor
TSE1

1-3
Figures 1-3 and 1-4 show some additional parts on the HC-300 unit. The HoneyCombe®
wheel is turned by a small drive motor and a toothed belt. A spring-type tensioner
automatically adjusts the belt tension.
1.3 CONTROLS AND INDICATORS
The unit has four indicators and controls on the control panel:
Auto/Off/Manual switch:
Auto position (amber) This indicator is on whenever the HC-300 is operating in the
automatic mode. The unit is switched on and off by a remote
humidistat.
Off position (amber) This indicator is on when the AC power to the unit is on, and it
is not running (not set to Auto or Manual). (On shut-down, the
heating elements will switch off. The reactivation blower will
continue to run to cool down the unit. Once cooled down, the
unit will become inactive.)
Manual position (amber) This indicator is on whenever the HC-300 is operating in the
manual mode. The unit runs continuously until it is switched
off.
Running light (green) This indicator is on whenever the unit is running (the Auto/Off/
Manual switch is in the Manual position, or the switch is in the
Auto position and the humidistat contacts are closed).
Fault light (red) This indicator is normally off. This light turns on when the unit
overheats. See the section on “Troubleshooting.”
Time meter This indicator shows how many hours the unit has operated.
The control system uses a number of sensors and controllers to supervise the activity of
the HC-300. A Solid State Power Controller (SSP1) turns the heating elements on and
off. This controller responds to a signal from a temperature sensor (TSE1) which is
FIGURE 1-3
CONTROLS AND INDICATORS
Running light
Time meter
Fault light
Auto/Off/Manual switch

1-4
Circuit breaker
Drive motor and
belt tensioner
Reactivation fan
control board
Process air
inlet
Process
air blower
Process
air outlet
Temperature sensor
(TS01)
Temperature sensor
(TS02)
Solid state
power control
for heaters
(SSP1)
Process
air lter
FIGURE 1-4 - FRONT VIEW, COVER OPEN
located in the reactivation air stream after the wheel. This design allows reduced energy
consumption at low load levels.
The unit continues to run for a few minutes after the Auto/Off/Manual switch is turned off.
This “cool-down” cycle helps to protect the heating elements from overheating. During
the cycle, the reactivation blower continues to operate. The “cool-down” period is con-
trolled by a thermostat switch (TS02).
1.4 PROTECTIVE CIRCUITS
The HC-300 has several sensors and circuits which protect the machine and operator
from possible problems. A temperature switch (TS01) is located just downstream of the
heater. This sensor will tell the control circuits if the elements overheat (temperature
above 320°F). If this happens, the Fault indicator will light and the machine will stop. To
reset the machine, wait until the unit cools to normal temperature. Turn the Auto/Off/
Manual switch off, then on again.
The wiring for each heating element includes a fusible link. This link will open if the
element overheats. If this happens, the HC-300 will continue to operate, but will not
dehumidify the process air. To correct this, nd the cause of the overheat condition and
replace the fusible link.
If a blower motor is jammed, it will start to draw a large amount of electrical current. If
one of the motors detects this condition, that motor will shut itself down. The rest of the
unit will continue to operate, unless an overheat fault is triggered. The affected motor will
reset itself automatically.
Entrance for
power
connection
Reactivation
air inlet and
lter
Reactivation
air outlet

2-1
2 - SAFETY NOTES
Munters is concerned about the safety of anyone who uses or services the HC-300 unit.
Some of the parts inside the HC-300 can be dangerous if an untrained person tries to
service the unit. Throughout this manual, we have pointed out some of the hazards
which may occur in the use of the HC-300. We have also listed the precautions which
you should take to avoid these problems.
In this manual, we will use three different kinds of messages to warn you of possible
problems:
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.
Please keep these points in mind as you use or service the unit:
The HC-300 is wired for 208V to 480V AC. The unit can produce
enough voltage and current to kill you, or cause severe burns. Do
not work with the electrical parts unless you are a trained electrician.
Always turn off the power before you work inside the unit. There
shouldbe a disconnect switch installedoutside the unit. Turn off this
switch before you do any work. For extra safety, also turn off the
circuit breaker inside the unit.
Some HC-300 units are purchased with an optional humidistat. If
wired incorrectly, the contacts inside the humidistat may carry a
high voltage. This voltage and current can cause serious injury or
death. Don’t work on the parts inside the humidistat unless you are
a trained electrician.