Phoenix R175 LGR Dehumidifier
TS-348
PO Box 8680 • Madison, WI 53708
Owner’s Manual — Phoenix R175 LGR Dehumidifier
Installation, Operation & Service Instructions
Read and Save These Instructions
The Phoenix Rꢀ75 is the first roto-mold LGR (low grain refrigerant) dehumidifier manufactured
by Therma-Stor, LLC. The Rꢀ75 combines Phoenix innovation, technical expertise and
proven durability. This unit will remove more water, produce more grain depression and dry
structures and contents faster than standard refrigerant dehumidifiers.
In addition to the performance benefits are the multiple ducting options, pleated media filter
and energy efficient operation. The Rꢀ75 is the latest member of the Phoenix line of LGR
dehumidifiers; the most effective and versatile drying devices made.
The Phoenix R175 LGR Dehumidifier
Increased Capacity - The Phoenix Rꢀ75 removes over
30% more water than other dehumidifiers of equal
size.
Energy Efficiency - Removes 92 pints at AHAM while
drawing only 6.ꢀ amps.
230 CFM - More processed air speeds drying and
provides superior static pressure for ducting.
More Grain Depression - The driest air from an LGR
gets your jobs drier quicker.
Focused Airflow - Patent pending focused outlet directs
air downward towards the wettest surface.
Multiple Ducting Options - ꢀ2” intake, ꢀ0” exhaust.
Plastic Housing - Rugged roto-molded housing resists
dents and scratches.
Solid State Controls - Easy to read and operate.
Protected Condensate Hose - Located under the lid.
Cannot catch or be damaged on obstructions.
Telescoping Handle - A heavy-duty retractable handle
for ease of transport and reduces space for storage
and stacking.
Recessed 12” Wheels - For greater maneuverability on
the job site and efficient storage. Rolls over obstacles
with ease.
Pleated Media Air Filter - A MERV-7 is standard.
Phoenix R175
Stacking/Nesting - Reduces space for ease of stacking
and storage.
Part No. 4026300
Specifications subject to change without notice.
Revised 1/07
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3.2 Electrical Requirements
3.6 POWER Button
The Phoenix Rꢀ75 plugs into a common grounded outlet
on a ꢀ5 amp circuit. It draws 6.ꢀ amps at 80°F, 60% RH.
If used in a wet area, a ground fault interrupter (GFI) is
required. If an extension cord is required, it must have a
minimum of ꢀ4 gauge conductors if 25 feet long or less
and ꢀ2 gauge conductors if greater than 25 feet long.
Press the POWER button to turn the dehumidifier on or off.
When starting the dehumidifier the display will show the
accumulated hours. Press the POWER button again to turn
the dehumidifier off. The display will also power off.
3.7 PURGE Button
During normal operation the pump automatically cycles
every four minutes. Press the PURGE button to remove
condensate manually from the reservoir. There are several
ways to manually remove water from the reservoir:
3.3 Condensate Removal
The Phoenix Rꢀ75 is equipped with an internal condensate
pump to remove the water that is condensed during
dehumidification. This allows the condensate to be
pumped 20 feet with the attached hose. If the condensate
must be pumped more than 20 feet above the unit, a
second pump must be added to relay the condensate. The
condensate pump automatically purges for 20 seconds
every four minutes. Use the PURGE button to manually
remove condensation.
ꢀ. Press the PURGE button once and the pump will run
for 20 seconds
2. Press and hold the PURGE button and the pump will
run for up to 30 seconds
3. Press the PURGE button while the dehumidifier is
powered off and the pump will run for 30 seconds.
Always manually purge the water reservoir before transport
or storage. Turn off the power and allow the plugged in
dehumidifier to rest ꢀ5 minutes before the final purge.
3.4 Ducting
A wire duct collar is supplied to allow ꢀ0” lay-flat duct to
be attached to the Phoenix Rꢀ75 outlet. Lay-flat plastic
ducting is available; see accessories table page 6. To
attach ducting to the wire duct collar, put the plastic duct
end through the collar center and roll the duct end outward
so that it overlaps the outside of the collar. The duct and
collar may then be quickly attached to the Phoenix Rꢀ75
by snapping the collar over the four exhaust tabs.
3.8 Hour Meter
The digital hour meter displays the cumulative time the
dehumidifier has been turned on to the tenth of an hour.
The total hours measured is stored when the unit is
unplugged. The previous total will be displayed the next
time the unit is turned on.
3.9 HOURS Button
3.5 Defrost Cycle
Press the HOURS button when the dehumidifier cannot
be plugged in and the hour meter needs to be read. The
digital hour meter will display the last saved cumulative
time for ten seconds.
If the low side refrigerant temperature drops due to exces-
sive frost formation on the evaporator coil and below the
temperature set point, the thermistor activates the solid-
state control and defrost light. The compressor is cycled
off and on by the thermistor temperature measurement.
The air mover will continue to run, causing air to flow
through the evaporator coil and melt the ice when the com-
pressor is off. When the air temperature and/or humidity
increases, the evaporator temperature will rise and the
thermistor will end the defrost cycle at the temperature set
point.
3.10 DEFROST Light
The DEFROST light turns on when the unit is in defrost
cycle and indicates when the compressor is off.
4 Maintenance
4.1 Air Filter
The Phoenix Rꢀ75 is equipped with a pleated media air
filter that must be checked regularly. The standard filter
is a MERV-7 high efficiency filter. Operating the unit with
a dirty filter will reduce the dehumidifier’s capacity and
efficiency and may cause the compressor to cycle off and
on unnecessarily. The filter can generally be vacuumed
clean several times before needing replacement.
Replacement filters can be ordered from the manufacturer
or purchased locally if available.
Figure 2: Phoenix R175 control board.
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cause the refrigerant pressure and temperature to drop. It
next enters the evaporator coil where it absorbs heat from
the incoming air and evaporates.
IMPORTANT: DO NOT operate the unit without the filter
or with a less effective filter as the heat exchanger and
coils inside the unit could become clogged and require
disassembly to clean.
The evaporator operates in a flooded condition, which
means that all the evaporator tubes contain liquid
refrigerant during normal operation. A flooded evaporator
should maintain constant pressure and temperature
across the entire coil, from inlet to outlet.
4.2 Storage
The mixture of gas and liquid refrigerant enter the
accumulator after leaving the evaporator coil. The
accumulator prevents any liquid refrigerant from reaching
the compressor. The compressor evacuates the cool
refrigerant gas from the accumulator and compresses it to
a high pressure and temperature to repeat the process.
There are two issues to consider when the Phoenix
Rꢀ75 is stored between uses and both pertain to the
water trapped in the unit: damage caused by freezing or
biological growth. The effect of the trapped water can be
greatly reduced if precautions are taken to remove as
much as possible before storage.
ꢀ. Use the pump PURGE button to reduce the water level
in the reservoir
2. Walk out the hose to drain it completely
In order to reduce biological growth flush the unit with
a biofungicide that is approved for use with copper,
aluminum, polyethylene and ABS. To flush:
ꢀ. Run the hose to a drain
2. Plug in the unit but do not turn it on
3. Remove the air filter. Slowly pour a pint of the
chemical through the top so that it drains into the heat
exchanger
4. Use PURGE button to remove chemicals in reservoir.
Run PURGE until hose runs dry
5. Walk out hose to drain completely
6. Replace air filter
Figure 3: Refrigeration system
5.2 Troubleshooting
No dehumidification, neither hour meter display nor
compressor run and POWER button does not turn ON.
5 Service
ꢀ. Unit unplugged or no power to outlet
2. Defective control board
WARNING: Servicing the Phoenix R175 with its high
pressure refrigerant system and high voltage circuitry
presents a health hazard which could result in death,
serious bodily injury, and/or property damage. Only
qualified service people should service this unit.
3. Loose connection in internal wiring
No dehumidification, neither hour meter display nor
compressor run with POWER button ON.
ꢀ. Defective control board
CAUTION: Do not operate unit without the front housing in
place.
2. Loose connection in internal wiring
Some dehumidification, air mover runs continuously but
compressor only runs sporadically.
5.1 Technical Description
The Phoenix Rꢀ75 uses a refrigeration system similar to
an air conditioner’s to remove heat and moisture from
incoming air and to add heat to the air that is discharged.
ꢀ. Unit is in defrost cycle, DEFROST light on
2. Defrost thermistor defective or loose
3. Loose connection in compressor circuit
4. Defective compressor overload
5. Defective compressor
Hot, high pressure refrigerant gas is routed from the
compressor to the condenser coil. The refrigerant is cooled
and condensed by giving up its heat to the air that is about
to be discharged from the unit. The refrigerant liquid then
passes through a filter/drier and capillary tubing which
6. Defective relay
7. Upper housing is not sealed to lower housing
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No dehumidification, air mover runs but compressor does
not.
Compressor runs with POWER button OFF.
ꢀ. Defective relay
ꢀ. Bad connection in compressor circuit
2. Safety float switch closed, check pump reservoir
3. Defective compressor capacitor
4. Defective compressor overload
5. Defective compressor
2. Defective control board
3. Upper housing not sealed to tower
No hour meter display when the HOURS button is pressed.
ꢀ. Unit is plugged in
2. Battery charge is low. Replace battery
3. Defective control board
6. Defective control board
Air mover does not run. Compressor runs briefly but cycles
on and off.
5.3 Air Mover
The motorized impeller has a PSC motor and internal
thermal overload protection. If defective, the complete
assembly must be replaced.
ꢀ. Loose connection in blower circuit
2. Obstruction prevents impeller rotation
3. Defective air mover
ꢀ. Unplug power cord
2. Remove the four screws attaching the bottom plate to
the lower housing
Unit removes some water but not as much as expected.
3. Disconnect the impeller leads
ꢀ. Air temperature and/or humidity have dropped
4. Remove the four screws holding the impeller to the
bottom plate
2. Humidity meter and/or thermometer used are out of
calibration
5. Reassemble the new impeller using the above
procedure in reverse
3. Unit has entered defrost cycle
4. Air filter dirty
5. Defective defrost thermistor
6. Low refrigerant charge
5.4 Thermistor
The defrost thermistor is
attached to the refrigerant
suction line between
the accumulator and the
evaporator.
7. Air leak such as loose cover
8. Defective compressor
9. Restrictive exhaust or inlet ducting
Unit runs but does not pump water.
ꢀ. Hose kinked or plugged
To replace thermistor:
Figure 4: Thermistor attached
to the refrigerant line.
ꢀ. Unplug the dehumidifier
2. Pump motor defective
2. Remove the front housing
3. Pump check valve plugged
4. Bad connection in pump circuit
5. Hose disconnected internally
6. Defective control board (pump phase)
3. Cut cable ties and remove aluminum tape.
4. Remove control panel
5. Unthread thermistor from control housing grommet
6. Detach thermistor from control board jumper, Jꢀ
7. Reassemble thermistor and dehumidifier using the
above procedure in reverse
Unit pumps water automatically but not when PURGE
button is pushed.
ꢀ. Bad connection in PURGE button circuit
2. Defective control board
Evaporator coil frosted continuously, low dehumidifying
capacity.
ꢀ. Defrost thermistor loose or defective
2. Low refrigerant charge
3. Dirty air filter or restricted air flow
4. Upper housing is not sealed to lower housing
Figure 5: Picture of pump and reservoir.
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5.5 Condensate Pump
The internal condensate pump removes water that collects
in the reservoir.
6 Options & Accessories
4025568
4024750
Air Filter, Pleated ꢀ2” x ꢀ2” x ꢀ” MERV-ꢀꢀ
Intake Flex Duct ꢀ2” x 25”
Metallize Polyester
To replace the condensate pump:
ꢀ. Unplug the unit
4024935
Lay-Flat Duct ꢀ0” Round x 250’ Roll
2. Remove the front housing
3. Unplug the pump wires from the wire harness
To order, contact Therma-Stor LLC at ꢀ-800-533-7533.
7 Wiring Diagram
THERMISTER
4. Remove the condensate hose and the one screw
attaching the pump bracket to the compressor support
5. Replace the pump, hose, wiring, bolts, and housing in
the reverse order
5.6 Float Safety Switch
The float safety switch activates when the water rises too
high in the condensate reservoir. The float safety switch
turns off the compressor until the water level lowers and
disengages the switch.
J3
BLU-14
J1 J2
E2
E3
E1
E4
BLK-4
E5
S
C
FLOAT
SWITCH
R
COMPRESSOR
BLOWER MOTOR
4026354
CONDENSATE PUMP
Figure 6: Picture of the float safety switch
WHT
BLK
CONTROL
BOARD
BLK
E1
To replace the float safety switch
ꢀ. Unplug the dehumidifier
2. Remove the front housing
WHT
BRN
BLU
E2
RUN CAP
7.5 MFD
BLK
E4
3. Unplug the float safety switch wires from the wire
harness
BLOWER MOTOR
YEL
YEL
J3
4. Remove the one screw attaching the pump and float
switch bracket to the compressor support
FLOAT SWITCH
5. Remove the pump from the reservoir and slide out the
float switch from under the compressor support
BLK
WHT
E5
E3
CONDENSATE PUMP
6. Replace the float, pump, wiring, bolts and housing in
the reverse order
COMPRESSOR
OVERLOAD
RUN CAP
25 MFD
S
YEL
C
BLK
R
RED
COMPRESSOR MOTOR
Figure 7: Wiring diagram
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8 Service Parts
Items listed are not shown
Description
Item
Description
Qty
Part No.
Qty
Part No.
ꢀ
Top Cover
ꢀ
40263ꢀ6
Compressor
ꢀ
4023648
2
Top Cover Latch
ꢀ
ꢀ
ꢀ
2
ꢀ
2
2
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
4026322
4026323
ꢀꢀ540ꢀ9
ꢀꢀ540ꢀ4
402634ꢀ
4026304
40263ꢀ2
402660ꢀ
40263ꢀ5
40249ꢀ6
4026306
4026307
4025078
4026326
40249ꢀ2
4024548
4026602
ꢀ9ꢀ2500
Evaporator Coil
Condenser Coil
Accumulator
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
4
4026343
4026345
4026357
4026333
4026339
4026360
4026308
4026309
ꢀꢀ54006
3
Latch Backstop
4
Hex Bolts, ꢀ/4”–20 x 4” 4
Hex Bolts, ꢀ/4”–20 x ꢀ.75”
Handle Assembly
5
Condensate Pump
Float Safety Switch
Impeller, Air Mover
Exhaust Grill
6
7
Wheel, ꢀ2”
8
Retaining Ring
9
Control Interface
Wire Duct Collar
Impeller Plate Bolt
ꢀ0
ꢀꢀ
ꢀ2
ꢀ3
ꢀ4
ꢀ5
ꢀ6
ꢀ7
ꢀ8
ꢀ9
Filter, ꢀ2” x ꢀ2” x ꢀ”
Hose (ꢀ/4” ID x 33’ long)
Coupling Body, ꢀ/4” Tube
Coupling Insert, 3/8” Tube
Cord
Control Board
Capacitor, Compressor, 25 μF
Capacitor, Impeller, 7.5 μF
Thermistor
Battery, 9.0 V
1
6
10, 11,
12, 13,
14
2, 3
4
9
15, 16,
17, 18,
19
5
7, 8
Specifications subject to change without notice.
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Phoenix R175 Dehumidifier Limited Warranty
Warrantor:
Therma-Stor LLC
PO Box 8680
Madison, WI 53708
Telephone: ꢀ-800-533-7533
Who Is Covered: This warranty extends only to the original end-user of the Phoenix Rꢀ75
dehumidifier, and may not be assigned or transferred.
Year One: Therma-Stor LLC warrants that, for one (ꢀ) year the Phoenix Rꢀ75 dehumidifier will
operate free from any defects in materials and workmanship, or Therma-Stor LLC will, at its
option, repair or replace the defective part(s), free of any charge.
Year(s) Two Through Five: Therma-Stor LLC further warrants that for a period of five (5) years, the
condenser, evaporator, and compressor of the Phoenix Rꢀ75 dehumidifier will operate free of any
defects in material or workmanship, or Therma-Stor LLC, at its option, will repair or replace the
defective part(s), provided that all labor and transportation charges for the part(s) shall be borne
by the end-user.
Year(s) One Through Seven: Materials and workmanship of the housing are covered.
End-User Responsibilities: Warranty service must be performed by a Servicer authorized
by Therma-Stor LLC. If the end-user is unable to locate or obtain warranty service from an
authorized Servicer, he should call Therma-Stor LLC at the above number and ask for the Therma-
Stor Service Department, which will then arrange for covered warranty service. Warranty service
will be performed during normal working hours.
The end-user must present proof of purchase (lease) upon request, by use of the warranty
card or other reasonable and reliable means. The end-user is responsible for normal care.
This warranty does not cover any defect, malfunction, etc. resulting from misuse, abuse, lack
of normal care, corrosion, freezing, tampering, modification, unauthorized or improper repair or
installation, accident, acts of nature or any other cause beyond Therma-Stor LLC’s reasonable
control.
Limitation and Exclusions: If any Phoenix Rꢀ75 Dehumidifier part is repaired or replaced, the new
part shall be warranted for only the remainder of the original warranty period applicable thereto
(but all warranty periods will be extended by the period of time, if any, that the Phoenix Rꢀ75
Dehumidifier is out of service while awaiting covered warranty service).
UPON THE EXPIRATION OF THE WRITTEN WARRANTY APPLICABLE TO THE PHOENIX Rꢀ75
DEHUMIDIFIER OR ANY PART THEREOF, ALL OTHER WARRANTIES IMPLIED BY LAW, INCLUDING
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, SHALL ALSO EXPIRE. ALL
WARRANTIES MADE BY THERMA-STOR LLC ARE SET FORTH HEREIN, AND NO CLAIM MAY
BE MADE AGAINST THERMA-STOR LLC BASED ON ANY ORAL WARRANTY. IN NO EVENT
SHALL THERMA-STOR LLC, IN CONNECTION WITH THE SALE, INSTALLATION, USE, REPAIR OR
REPLACEMENT OF ANY PHOENIX Rꢀ75 DEHUMIDIFIER OR PART THEREOF BE LIABLE UNDER
ANY LEGAL THEORY FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES INCLUDING
WITHOUT LIMITATION WATER DAMAGE (THE END-USER SHOULD TAKE PRECAUTIONS AGAINST
SAME), LOST PROFITS, DELAY, OR LOSS OF USE OR DAMAGE TO ANY REAL OR PERSONAL
PROPERTY.
Some states do not allow limitations on how long an implied warranty lasts, and some do not
allow the exclusion or limitation of incidental or consequential damages, so one or both of these
limitations may not apply to you.
Legal Rights: This warranty gives you specific legal rights, and you may also have other rights
which vary from state to state.
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