Operate Phoenix DryMAX XL LGR Dehumidifier
Processes For Growing Restoration Companies
Operate Phoenix DryMAX XL LGR Dehumidifier
The groundbreaking DryMAX XL removes an amazing 125 ppd at AHAM while taking up only 50% of the space of the next smallest competitive XL dehumidifier. Because of its compact size, the DryMAX XL allows restorers to fit twice the amount of XL dehumidifiers on their vehicle. The DryMAX XL is also the first dehumidifier with built-in Bluetooth technology and the first with an advanced graphical control panel which puts all the information on homescreen in an easily understandable format. Our free DryLINK app is included with the unit upon purchase.  This unit will automatically send the psychrometric data by Bluetooth to the DryLINK app or an app you may already use for your drying jobs

Like our industry-leading DryMAX and AirMAX, the new Phoenix DryMAX XL was also designed with superior stacking features and easy service access. Our patented FiveCOIL design, which includes our micro-channel condenser, allows the featherweight DryMAX XL to pack a knock-out punch on drying performance every time.
Step 1: Specifications
  • Part No. 4037000 (Red) 4037060 (Blue)
  • Power 7.7 amps, 110-120 VAC, Grounded
  • Water Removal 125 pints/day @ AHAM (80°F, 60%)
  • Blower 300 CFM at max speed
  • Refrigerant Charge 1 lb, 8 oz. R-410A
  • Operating Range 33°F to 104°F
  • Filters: 12” x 14” x 1” Pleated Media MERV-10 (Part #4038558) (Part #4039853 Duct Ring 10”) (Part #4039854 Duct Ring 14”)
  • Duct Options Outlet – 2 x 10” Lay-Flat or 1 x 14” Lay-Flat
  • Warranty Five years; 1st year 100% of Parts and Labor 2nd-5th year 100% of sealed refrigeration system parts.
  • Dimensions Unit Shipping Width 16” 19.5” Height 17.5” 20” Depth 24” 28” Weight 88 lbs 90 lbs
  • US Patent 10,168,058
Step 2: Operation
Place dehumidifier inside structure, place condensate hose into a drain, or a very large container, and turn on. To decrease drying times, make sure all windows and doors are closed to the outside and seal off the wet area from any unaffected areas.

3.1 Transporting

The Phoenix DryMAX XL features a high-impact roto-molded housing which protects the unit. It is recommended the units are properly secured for transport. The Phoenix DryMAX XL must always be on its base when transported by vehicle.

3.2 Electrical Requirements

The Phoenix DryMAX XL plugs into a common grounded outlet on a 15 amp circuit. It draws 7.7 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 14 gauge conductors if 25 feet long or less and 12 gauge conductors if greater than 25 feet long.

3.3 Control Panel

When presented with Control Panel Selection Boxes in the control panel the white box with the black lettering will be the active selection.

Control Panel Key
Light Bar

Green Pulsing = The system is running correctly but the compressor is off.
Green = The system is running normally and the compressor is on.
Blue = The system is running normally but the unit is in defrost.
Red = Reservoir full, check the pump, float switch, or condensate hose

3.3.1 Startup
When the unit is plugged in you will see the Phoenix logo followed by the Standby Screen


3.3.2 Plugged In - Standby Mode

When plugged in but without pushing the power button, the display will communicate to the user that the machine is in Standby mode and ready to be powered on. In Standby Mode, the display will also show the current job and life hours on the fourth line.
Light Bar = Off
The Powering Up screen allows the compressor time to acclimate before starting up.
3.3.3 Power Button
When the dehumidifier is plugged in it will enter stand-by mode
Press the button to turn the dehumidifier on. The unit will begin the Powering Up sequence and you will see this screen:
Press and hold the Power button to turn the dehumidifier off. The dehumidifier will go through a powering-down cycle.

The default shut-down time is three minutes plus 20 seconds for a final purge. The shutdown time can be changed be scrolling through the menu to this screen.

  • Unplugging the unit without running the shutdown sequence will allow water to remain in the unit after use. 
  • Tilting the unit more than 70 degrees on the handle side or more than 20 degrees on the non-handle side may result in water spillage. 
  • Tilting the unit without running the final purge may result in water spillage.

3.3.4 PURGE Button

During normal operation the pump automatically cycles when the reservoir is full.

Press the button to remove condensate manually from the reservoir.

3.3.5 Dashboard
Dashboard while in Humidistat Mode
When the machine is dehumidifying the unit will display:
  • Inlet = Temperature and RH/Grains
  • Outlet = Temperature and RH/Grains
  • Hours = Job hours and Life hours
  • Grain Depression/Gram Depression = Grains/Grams per pound value will automatically be displayed with the RH SetPoint
Light Bar = On
Color = Green

3.3.6 Navigation

Press the NEXT key to advance to the next screen or to enter a value
Press the SET key to scroll through available values.

The White Box indicates the selected choice when two boxes are presented.

Press the Purge key to return to the dashboard

3.3.7 Purging
Press the PURGE button to purge the machine. The display will communicate to the user that the machine is purging on the fourth line of the dashboard and show a 20 second countdown timer. This will momentarily replace grain depression until the machine has finished purging.
The display will also communicate to the user that the machine is auto purging in the fourth line of the dashboard and show a 20 second countdown timer.

3.3.8 Condensate Removal

The Phoenix DryMAX XL is equipped with an internal condensate pump to remove the water that is condensed during dehumidification. This allows the condensate to be pumped up to 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 when the reservoir is full. Use the PURGE button to manually remove condensation.
For help with the “Reservoir full: check float, pump, and hose” error see Step 6 Troubleshooting

3.3.9 Defrosting

The display will communicate to the user that the machine is defrosting on the fourth line of the dashboard. This will momentarily replace grain depression until the machine has finished defrosting.

Light Bar = On
Color = Blue

3.3.10 Defrost Cycle

If the low side refrigerant temperature drops due to excessive frost formation on the evaporator coil and below the temperature set point, the thermistor activates the PLC and Status Light Indicator. 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 compressor 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.
Light Bar = Blue
Step 3: Maintenance
4.1 Air Filter

The Phoenix DryMAX XL is equipped with a pleated media air filter that must be checked regularly. The standard filter is a MERV-10 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 IMPORTANT: DO NOT operate the unit without the filter or with a less effective filter as the coils inside the unit could become clogged and require disassembly to clean.

1. Lift handle to replace filter
2. Pull on the filter tab \
3. Use finger slot to help push the filter out

4.2 Storage and Freeze Protection

There are two issues to consider when the Phoenix DryMAX XL is stored between uses and both pertain to water trapped in the unit.  The first is biological growth and the second is damage caused by freezing. The effects of the trapped water can be greatly reduced if precautions are taken to remove as much as possible before storage.
1. Use the pump PURGE button to reduce the water level in the reservoir.
2. Stretch the hose flat to drain it completely. Raise one end above your head and spool hose while draining water out the other end.
3. To reduce biological growth flush the unit with a bio-fungicide that is approved for use with copper, aluminum and polyethylene.
To flush:
a. Run the hose to a drain.
b. Plug in the unit but do not turn it on.
c. Remove the air filter. Slowly pour a quart of the antimicrobial through the heat exchanger
d. Hold in the pump purge switch to reduce the water level in the reservoir.
e. Flush with water.
4. If the unit will be exposed to freezing temperatures, after purging, take off the upper housing and pour 1 cup (8oz) of a propylene glycol based anti-freeze through the heat exchanger. It will flow down into the pump reservoir. Do NOT purge the solution out of the unit.
5. Dirty filters should be changed prior to long term storage to prevent biological growth on the filter.
Step 4: Service
WARNING: Servicing the Phoenix DryMAX XL 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.

CAUTION: Do not operate unit without the top cover in place.

5.1 Running Diagnostics
5.1.1 Diagnostic Mode

Contact Phoenix Tech Support for help with Diagnostic Mode - 800.533.7533. Diagnostics mode is used by our technical support team to help diagnose problems
Press the Next button for 3 seconds to enter Diagnostic Mode. This action can also be performed at any time while the machine is powered on. If Alerts are active, press the Next button to advance to the next screen. Otherwise, press the Next button again to return to the Dashboard.

5.1.2 Diagnostic Mode - Pump

Press the Set button to toggle the Pump On/Off.
Press the Next button to advance to the next screen.
5.1.3 Diagnostic Mode - Float Switch
This display will communicate to the user the current status of the Float Switch. Press the Next button to advance to the next screen. The float switch will be “Up” or “Down”.

5.1.4 Diagnostic Mode - Fan
Press the Set button to toggle the Fan On/Off.
Press the Next button to advance to the next screen.

5.1.5 Diagnostic Mode - Compressor
Press the Set button to toggle the Compressor On/Off.
Press the Next button to advance to the next screen.

5.1.6 Diagnostic Mode - Display Test
Press the Set button to start the Display test.

5.1.7 Diagnostic Mode - Refrig. Test
The display will communicate to the user the following information during a Refrigeration Test: Inlet = Temperature and RH/Grains
Outlet = Temperature and RH/ Grains
Hours = Life hours only.
Evaporator Coil = Temperature
Countdown timer = 20 minutes
Once the 20 minute countdown timer has expired, the display will automatically advance to show the refrigeration test results. The display will communicate to the user either “Refrig. test passed” or “Refrig. test failed”.


Press the Next button to return to the first diagnostic test or press and hold the Next button for 3 seconds to return to the Dashboard.

Step 5: Technical Description
The Phoenix DryMAX XL uses a refrigeration system similar to an air conditioner’s to remove moisture from incoming air and to add heat to the air that is discharged. 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 cause the refrigerant pressure and temperature to drop. It next enters the evaporator coil where it absorbs heat from the incoming air and evaporates. 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. The mixture of gas and liquid refrigerant enter the compressor after leaving the evaporator coil. The compressor evacuates the cool refrigerant gas from the accumulator and compresses it to a high pressure and temperature to repeat the process.
Step 6: Troubleshooting
Reservoir Full: Check Float, Pump, and Hose Error
If the float is up for 60 seconds the status bar will turn red and the screen will display “Reservoir full: check float, pump, and hose”.  To clear this error the float must go down.

Make sure the condensate hose is not kinking or blocked, make sure the float can go up and down freely.  If you cannot resolve this error call tech support at 800-533-7533.

If left on, the unit will try to pump every eight minutes.

No dehumidification, control does not light up and unit will not turn on from power button.
1. Unit unplugged or no power to outlet
2. Defective control board
3. Loose connection in internal wiring

Some dehumidification, air mover runs continuously but compressor only runs sporadically.
1. 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
6. Defective control board
7. Upper housing is not sealed to lower housing

No dehumidification, air mover runs but compressor does not.
1. Bad connection in compressor circuit
2. Safety float switch closed, check pump reservoir
3. Defective compressor capacitor
4. Defective compressor overload
5. Defective compressor
6. Defective control board

Air mover does not run. Compressor runs briefly but cycles on and off.
1. Loose connection in blower circuit
2. Obstruction prevents impeller rotation
3. Defective air mover

Unit removes some water but not as much as expected.
1. Air temperature and/or humidity have dropped
2. Humidity and/or temperature measurement is out of calibration
3. Defective defrost thermistor
4. Defective humidity sensor

Unit runs but does not pump water.
1. Hose kinked or plugged
2. Pump motor defective
3. Pump check valve plugged
4. Bad connection in pump circuit
5. Hose disconnected internally
6. Float switch

Unit pumps water automatically but not when PURGE button is pushed.
1. Bad connection in PURGE button circuit
2. Defective control board

Evaporator coil frosted continuously, low dehumidifying capacity.
1. 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

Compressor runs with POWER button OFF.
1. Defective control board

Air Mover
The air movement is created by an impeller. If defective, the complete assembly must be replaced.
1. Unplug power cord
2. Remove the exhaust grill
3. Disconnect the impeller leads
4. Remove the impeller bracket
5. Remove the four screws holding the impeller to the mounting plate
6. Reassemble the new impeller using the above procedure in reverse

Thermistor Probe
A thermistor is used to sense the temperature of the evaporator coil. It is inserted into the evaporator coil thru the top. To replace the thermistor probe:
1. Unplug the dehumidifier
2. Remove the top housing (3/8” driver)
3. Pull thermistor probe up and out of evaporator coil
4. Remove electrical box cover (T20 Torx)
5. Unthread thermistor probe wire from harness
6. Unplug thermistor probe connector on control board
7. Reassemble thermistor probe and dehumidifier using the above procedure in reverse

Condensate Pump
The internal condensate pump removes water that collects in the reservoir.
To replace the condensate pump:
1. Unplug the unit
2. Remove the top housing (3/8” driver)
3. Unplug the pump connector and the communications cable
4. Remove the condensate hose and the three screws (T27 Torx) attaching the pump bracket to the bottom housing . Swing connection bracket to the right and out of your way as pictured below
5. Pull on the white pump cover to remove the pump assembly
6. Remove the screws on the pump bracket (T20 Torx)
7. Replace the pump, hose, wiring, bolts, and housing in the reverse order

Float Switch
The float safety switch activates the pump when the water rises too high in the condensate reservoir. The float switch also turns off the compressor until the water level lowers and disengages the switch.


If the float switch is stuck in the up position for more than 60 seconds, a reservoir full error will occur.

The possible causes of this error are as follows:
  • Broken pump
  • Blockage on hose
  • Mechanical binding of the float switch

To replace the float switch: 
1. Unplug the unit 
2. Remove top housing (3/8” driver)
3. Check to see that the float moves freely. If the float needs to be replaced proceed to step 4
4. Open the electrical box cover (T20 Torx)
5. Unplug the Float switch wires from the control board
6. Unscrew the float switch from the bracket
7. Replace the float switch
Step 7: Options & Accessories
4038558 Air Filter, Pleated, 12” x 14” x 1” MERV 10
4024935 Phoenix Lay Flat 10” Round x 250’
4024936 Phoenix Lay Flat 14” Round x 250’
4024750 Flex Duct 12” x 25’
Step 8: Wiring Diagram


Step 9: Service Parts

* For compressor and coil issues please contact Phoenix Technical Support –608-237-8400.
Step 10: Warranty
Warrantor: Therma-Stor LLC 4201 Lien Rd. Madison, WI 53704 Telephone: 1-800-533-7533 Who Is Covered: This warranty extends only to the original end-user of the Phoenix DryMAX XL dehumidifier and may not be assigned or transferred. Year One: Therma-Stor LLC warrants that, for one (1) year the Phoenix DryMAX XL 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 DryMAX XL 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 DryMAX XL 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 DryMAX XL Dehumidifier is out of service while awaiting covered warranty service). UPON THE EXPIRATION OF THE WRITTEN WARRANTY APPLICABLE TO THE Phoenix DryMAX XL 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 DryMAX XL 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
Powered byKnowHow Logo
Learn more about how KnowHow trains, equips, and upskills workers on-the-go at tryknowhow.com