thermastor Phoenix 1800 DX User manual

Owner’s Manual —
Phoenix 1800 DX Desiccant Dehumidifier
Installation, Operation & Service Instructions
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Read and Save These Instructions
The Phoenix 1800DX is a complete mobile desiccant drying
system. This powerful efficient desiccant has 1800 CFM of
process air while drawing only 16 amps at 115 volts. The
1800DX is constructed of durable, stainless steel and uses
an advanced silica gel rotor. The 1800DX has up to 6 days
run time on only 100 gallons of propane, beating all other
desiccants in its class.
The Phoenix 1800DX system includes a high performing, high
efficiency desiccant dehumidifier, a 16ft. tandem axle V-nose
trailer with electric brakes and a 120-gallon DOT approved
propane cylinder.
The Phoenix 1800DX is the perfect first-responder to any
drying emergency.
• Dual Axle, V-Nose Trailer
• 115 volts @ 16 amps
• 1800 CFM process airflow (3060 m3/hr)
• 1000 pints/day @ AHAM (473 L/Day)
• 420 lb DOT approved Propane Cylinder (190 kg)
Specifications subject to change without notice.
4201 Lien Rd. • Madison, WI 53704
The Phoenix 1800 DX
• Dries in temperatures to 140ºF (60°C)
• Corrosion Resistant Stainless Steel
Construction
• Reaches dew points as low as -40ºF (-40°C)
Phoenix 1800DX
Desiccant Dehumidifier
PN 4028001
1800 DX includes 16’ tandem trailer
w/electric brakes
TS-581
07/14
FOR YOUR SAFETY: DO NOT store or use
gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
Improper installation, adjustment, alteration, service
or maintenance can cause injury or property damage.
Refer to this manual. For assistance or additional
information, call a qualified installer, service agency or
the gas supplier.
FOR YOUR SAFETY: If you smell gas: DO NOT
try to light any appliance. DO NOT touch any electrical
switch. IMMEDIATELY call your gas supplier from a
location away from the device. If the gas supplier cannot
be reached, call the fire department.

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GENERAL HAZARD WARNING
Failure to comply with the precautions and
instructions provided with this unit can result
in death, serious bodily injury and property loss
or damage from hazards of fire, explosion, burn,
asphyxiation, carbon monoxide poisoning, and/or
electrical shock.
Only persons who can understand and follow the
instructions should use or service this unit.
If you need assistance or unit information such
as an instruction manual, label, etc., contact a
qualified installer, service agency, gas supplier, or
the manufacturer.
Do NOT use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas
control which has been under water.
Should overheating occur, or the gas supply fail
to shut off, shut off the manual gas valve to the
appliance before shutting off the electrical supply.
Installation must conform to applicable local codes and/
or the National Fuel Gas Code, ANSI Z223.1, the Standard
for the Storage and Handling of Liquefied Petroleum
Gasses, ANSI/NFPA 58 and the Natural Gas and Propane
Installation Code, CSA B149.1.
Other standards govern the use of fuel gases and
heat producing products in specific applications. Your
local authority can advise you about these.
FIRE, BURN, INHALATION, AND
EXPLOSION HAZARD.
Keep solid combustibles, such as building materials,
paper, or cardboard, a safe distance away from the
unit as recommended by the instructions. Never use
the unit in spaces which do or may contain volatile or
airborne combustibles, or products such as gasoline,
solvents, paint thinner, dust particles or unknown
chemicals.
MISES EN GARDE GENERALES
Le non-respect des mises en garde et des instructions fournies avec
ce radiateur peut entrainer la mort, de graves blessures et des pertes
materielles ou des dommages a la propriete resultant d’un incendie,
d’une explosion, de brulures, d’asphyxie, d’empoisonnement au
monoxyde, de carbone et/ou d’un choc electique.
Seules les personnes aptes a comprendre et a suivre les instructions
devraient se servir de ce radiateur ou le reparer.
Si vous avez besoin d’aide ou d’informations concernant ce radiateur
ou le reparer.
Avertissement
Risque d’incendie, de brulures, d’inhalation et d’explosion.
Garder les combustibles solides, tels les materiaux de
construction, le papier et le carton, a bonne distance de ce
radiateur, comme il est recommande dans les instructions.
ne jamais utiliser cet appareil dans des endroits qui
contiennent ou pourraient contenir des combustibles
volatiles ou en suspension dans l’air tels l’essence, les
solvants, les diluants pour peinture, les particules de
poussieres ou des produits chemiques inconnus.

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Table of Contents
Introduction ................................................................1
Warnings ..............................................................2
1. Specifications........................................................4
2. Operation .............................................................4
2.1 How the Phoenix 1800DX Works........................... 4
3. Installation............................................................5
3.1 Inspection ......................................................5
3.2 Location .........................................................5
3.3 Set-Up ............................................................5
3.4 Ducting...........................................................5
3.5 Avoiding Secondary damage.............................5
3.6 Electrical Requirements ...................................6
4. Operation Instructions............................................6
4.1 Start-Up Procedure ..........................................6
4.2 Cool Down ......................................................7
4.3 Shut Down and Disconnect Procedure...............7
5. Control Panel ........................................................7
5.1 Main Disconnect .............................................7
5.2 Power Light.....................................................7
5.3 Selector Switch ...............................................7
5.4 Run Light........................................................7
5.5 Alarm (Light and Horn).....................................7
6. Maintenance .........................................................7
6.1 General Maintenance ......................................7
6.2 Cabinet ..........................................................7
6.3 Filter ..............................................................7
6.4 Blower and Motor ............................................8
6.5 Drive Motor.....................................................8
6.6 Rotor Drive Belt...............................................8
6.7 Seals .............................................................8
6.8 Desiccant Media .............................................8
6.9 Fuel Cylinder ...................................................8
7. Wiring Diagram ................................................9,10
8. Troubleshooting...................................................11
9. Service Parts List ................................................12
10. Warranty.............................................................13
Serial No.__________________________________
Purchase Date_____________________________
Dealer’s Name_____________________________
Read the operation and maintenance instructions
carefully before using this unit. Proper adherence to these
instructions is essential to obtain maximum benefit from
your Phoenix 1800DX.

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1 Specifications
Part No. 4028001
Power 115 Volt, 16 amps
20 Amps minimum service required
BTU Input 60000 (17.6kW)
Water Removal 1000 pints/day @ AHAM (473 L/Day)
Blower 1800 CFM Process Air Flow (3060 m
3
/hr)
400 CFM Reactivation Air Flow (680 m
3
/hr)
Operating -10ºF to 140ºF (-23°C to 60°C)
Range
Filters (2) 16” x 16” x 2” (406mm x 406mm x 51mm)
Duct Options Process inlet 14” Flex-Duct (356mm)
Process outlet 14” Flex-Duct/Lay Flat (356mm)
Reactivation inlet NOT DUCTABLE
Reactivation outlet NOT DUCTABLE
Trailer 7’ x 16’ Dual Axle (2.1m x 4.9m)
V-nose Trailer (nominal)
Rear Ramp Door
Dual Side Access Doors
Propane
Cylinder Onboard 420 lb DOT (190kg)
Approved LP Tank
Warranty 1 year 100% Parts & Labor
Dimensions
Trailer Overall Height 96” (2438mm)
Trailer Overall Length 246” (6248mm)
Trailer Interior (not including V-nose) 163”L x 81”W x 75”H
(4140mm x 2057mm x 1905mm)
Trailer GVWR 7700 lbs. (3490kg)
1800DX Dry Weight 3660 lbs. (1660kg)
Tire Size 205/75/R15
Hitch Size 2-5/16” (58.74mm)
Fuel Tank 420 lb. DOT approved cylinder
(190kg)
100 gallon LP capacity (379L)
Accessories
4028029 16” x 16” x 2” Aluminum Process Air Filter
(406mm x 406mm x 51mm)
4021799 16” x 16” x 2” Pleated Reactivation Air Filter
(406mm x 406mm x 51mm)
4024936 14” x 250’ Lay-flat Duct (356mm x 76.2m)
4028043 14” Flex-Duct (356mm)
4026305 Humiport 05 Thermo-Hygrometer
4026310 Humiport 10 Thermo-Hygrometer
4024995 Phoenix HMI-41
2 Operation
The function of the dehumidifier is to remove moisture (in
the vapor state) from an air stream. This is accomplished
by exposing the air to an adsorbing media (desiccant) in
a sealed air stream (process). After the desiccant has
adsorbed moisture, it is exposed to a second air stream
at an elevated temperature (reactivation). This causes
the moisture to be driven out of the desiccant preparing it
for more moisture adsorption. This process is done on a
continuous basis, providing a constant drying process. The
two air streams (process and reactivation) are separated
by seals, which contact the desiccant media. Figure 1
illustrates the relationship of the seals and airflow pattern.
The dehumidifier is designed with the two air streams
flowing in opposite directions (counter flow) thereby
maximizing the energy efficiency of the equipment.
2.1 How the Phoenix 1800DX Works
The Phoenix 1800DX has two separate air streams that
run through it – Process and Reactivation (Fig. 1).
Process Air Stream:
P1 – 1800 (3060 m3/hr) CFM of air enters the machine
(Process Air Inlet) and...
P2 – ...water vapor from incoming air is deposited
(adsorbed) on the desiccant wheel.
P3 – 1800 (3060 m3/hr) CFM of dry air exits the machine
(Process Air Outlet).
Reactivation Air Stream:
R1 – 400 (680 m3/hr) CFM of air enters the machine
(Reactivation Air Inlet) and...
R2 – passes over the heater burner.
R3 – Water vapor is picked up (desorbed) from the
desiccant wheel by the hot air and...
R4 – ... 400 (680 m3/hr) CFM of wet air exits the machine
(Reactivation Air Outlet).
Cabinet Divider
and Seals
Reactivation Air Outlet
Process Air Inlet
Heater
Principle of Operation
Process Air Outlet
Desiccant Wheel
Desiccant Wheel
Drive and Chain
Reactivation Air Inlet
Figure 1
P1 P2 P3
R1
R2
R4 R3

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air from outside the drying chamber, while the Process Air
Outlet is ducted into the chamber.
3.4 Ducting
To get maximum performance out of the 1800DX
desiccant dehumidifier, ALL SUPPLY AND RETURN AIR
DUCTING MUST BE AIR AND VAPOR TIGHT. This is
extremely important for proper performance. Ensure that
reactivation discharge air does not enter the process
or reactivation inlets. Be sure that the return air duct
connection(s) is physically sound, is sealed to the
appliance casing, and terminates outside of the trailer.
Using excess duct length significantly reduces air flow
volume through duct. This is true in any application. If the
job at hand needs a short length of duct, cut a section to
the appropriate length. If air flow is restricted by excess
length, performance will suffer. The same can be said of
excess bends in the ducting.
All ducting materials are available from Therma-Stor LLC
(see accessories list in Section 1).
Process inlet: 14” flex duct. (356mm)
To attach flexible ducts to the process air inlet, push
the duct wire past the metal flange on the 1800DX duct
collar. Secure with hose clamps or ratcheting straps. If
only using one inlet connection, seal second connection.
Process outlet: 14” flex or lay flat plastic duct.
(356mm)
To attach flexible ducts to the process air outlet, push
the duct wire past the metal flange on the 1800DX duct
collar. Secure with hose clamps or ratcheting straps.
When using 14” (356mm) lay flat ducting, slip over the
outlet collar and zip-tie or duct tape in place.
3.5 Avoiding Secondary Damage
The Phoenix 1800DX is a powerful tool capable of
removing a great deal of water from most environments.
Care must be taken to avoid secondary damage of over-
drying and or unexpected condensation.
The Phoenix 1800DX removes vapor water from the
incoming process air stream and transfers it to the
outgoing reactivation air stream. The reactivation exhaust
air is hot and wet.
Take care to prevent the reactivation exhaust air stream
from causing secondary damage due to condensation.
Always ensure the 1800DX is located with the
reactivation outlet pointed such that reactivation air will
NOT be drawn back into the structure.
The Phoenix 1800DX does not produce liquid water
internal to the machine. There is no condensate pump
and no drain hose.
The 1800DX desiccant dehumidifier will continue to
remove water from already dry, cold air. It is possible to
over-dry objects and or structures.
Care must be taken to avoid secondary damage due to
over-drying.
3 Installation
Proper installation is critical to the performance of the
Phoenix 1800DX. Follow the guidelines below to maximize
service life and performance.
3.1 Inspection
Thoroughly inspect the machine to ensure no damage
has occurred during transport or on the job site. Check
for any obvious signs of deterioration of the 1800 device.
Examine the base of the 1800 for signs of sagging, gaps,
or cracks between the base and the trailer floor.
3.2 Location
Note the following precautions when locating the Phoenix
1800DX:
Trailer must be located outdoors with reactivation outlet
pointed away from open windows or building fresh air
inlets. Position trailer for shortest, straightest duct run
to structure. Provisions for adequate combustion and
ventilation air must be provided in accordance with section
5.3 of the National Fuel Gas Code ANSI Z223.1.
Always ensure the 1800DX is located with the reactivation
outlet pointed such that the reactivation air exhausts
to the atmosphere in an unoccupied area and can NOT
be drawn into any nearby structure. Do not exhaust
reactivation air across walkways or towards buildings,
openable windows, or building openings. Do not allow
the reactivation outlet to become obstructed by snow,
construction debris, etc. Maintain a minimum 4’
clearance around electric and gas meters, regulators, and
relief equipment. Locate device a minimum of 10’ from
combustible constructions. Be aware that reactivation air
contains flue gasses that, over time, can degrade some
building materials. Do not connect device to a chimney
flue serving a separate appliance designed to burn solid
fuel.
Do not direct process or reactivation air streams toward
any Propane-gas container within 20’ (6m).
3.3 Set-Up
When conditions warrant the use of a desiccant
dehumidifier, use one of the setups described below to
achieve efficient drying, while avoiding secondary damage.
Review Section 2.1 to understand the desiccant drying
process. Always ensure the 1800DX is located with the
reactivation outlet pointed such that reactivation air will
NOT be drawn back into the structure.
Neutral Pressure Setup
Many drying applications require neutral pressure
operation. In this setup, the Process Air Inlet pulls air
from the affected area (drying chamber) and returns dried,
processed air to the affected area via the Process Air
Outlet.
Positive Pressure Setup
For Positive Pressure operation, the Process Air Inlet pulls

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3.6 Electrical Requirements
A dedicated and properly grounded 115VAC outlet with
20A branch protection is required for correct operation.
Be sure no other devices are running, or could start on the
same circuit as the 1800DX device.
All local and state codes must be strictly adhered to and
good electrical practices should be followed to achieve the
best installation possible.
In the absence of local codes, refer to National Electric
Code, ANSI/NFPA 70 if an external electrical source is
utilized.
(See Electrical Schematic drawing in the back of this
manual for internal wiring.)
4 Operating Instructions
The Phoenix 1800DX dehumidifier comes complete and
ready for operation.
Note: Do not place any items over reactivation air filter
inside trailer. Adequate clearance must be provided for
proper combustion airflow.
4.1 Start-Up Procedure
1) Verify main disconnect and selector switch are both
in the OFF position.
2) Plug in power cord.
3) Open gas valves (one on tank in V-nose and one
inside trailer near 1800 device).
4) Switch on main disconnect.
5) Turn selector switch to ON.
6) Once both blowers have started, burner will light
(this could take 2 to 3 minutes).
7) Observe flame through window. Blue flame should be
steady and in contact with burner element.
Figure 2
Main Disconnect
Selector Switch
Figure 3
Gas Valves
NOTE: Consult local codes for
additional requirements involving
external shutoff valves. Observe flame through
window here.
Lead Power Cord through round
cord access port and plug into
20A 115VAC outlet
Figure 4
Flame should be blue in color and cling to the
surface of the fiber element within ½” to ¾”.

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5.5 Alarm (Light and Horn)
The alarm indicator lamp illuminates (and horn sounds) to
indicate that a fault condition exists. The fault conditions
could be:
• Motor overload
• Reactivation temperature greater than 375°F (190°C)
(possibly due to low reactivation airflow)
• No dehumidification (i.e. saturated wheel)
An external alarm can be wired to terminals 52 and 58.
This will provide 115VAC during an alarm condition.
6 Maintenance
6.1 General Maintenance
A definitive time schedule should be established for
inspecting all rotating parts and components. Inspection
requirements depend on the frequency of operation,
transport, and operating conditions. Periodically check
the condition of the air filter, rotating parts, and fasteners
to ensure they are secure and in proper working order.
Periodically check airflow to make sure there are no
obstructions to airflow in outlet or inlet ductwork.
Recommended minimum inspections:
• Upon installation
• After 1 week of operation.
• Annually thereafter or upon loss of performance
to include combustion system and be performed by a
qualified servicer.
Note: The appliance and its inidividual shut off valve must
be disconnected from the gas supply piping system during
any pressure testing of that system at test pressure in
excess of 1/2 PSIG (2.5 KPA).
6.2 Cabinet
Disconnect power before removing access panels.
Remove panel fasteners and panels from unit to access
internal components. The condition of the cabinet gaskets
should be observed during inspection and servicing to
insure a good seal. Any leaks must be sealed and panels
securely fastened for proper dehumidifier operation.
Burner compartment may be cleaned by removing burner
access panel and using compressed air to loosen
contaminants. Follow up by vacuuming loose debris.
6.3 Filter
The maintenance interval for the filter depends directly on
the cleanliness of the air entering the dehumidifier. It is
suggested that a program be established to assure that the
filters are replaced or cleaned prior to becoming clogged to
the point they create a system problem.
Two air filters (16”x16”x2”) (406mm x 406mm x 51mm)
must be checked regularly. One filter is located at the
4.2 Cool Down Procedure
Failure to follow COOL DOWN PROCEDURE may result in
damage to unit due to overheating. ALWAYS follow COOL
DOWN PROCEDURE before shutting unit down.
1) Set Selector switch to OFF and wait for COOL DOWN
light to come on.
2) Process blower and burner should be OFF.
3) WAIT for COOL DOWN LIGHT to go OFF (5 minutes).
4.3 Shut Down & Disconnect Procedure
1) Verify COOL DOWN LIGHT is not illuminated and
Cool Down Procedure has been followed.
2) Close gas valves. (valve on LP tank and valve
inside trailer)
3) Turn Main Disconnect switch to OFF.
4) Unplug power cord.
Note: Be sure the gas is turned off at the propane supply
cylinder when the 1800DX is not in use.
5 Control Panel
5.1 Main Disconnect
The Main Disconnect switches power from the source to
the panel. Power must be disconnected at the source
prior to accessing control panel. Access to the control
panel with power applied is ONLY by qualified service
personnel.
Power is present up to disconnect even in OFF position.
Disconnect power at the source before opening panel.
5.2 Power Light
The POWER indicator lamp illuminates to indicate that
power is supplied to the control panel.
5.3 OFF-ON Selector Switch
When the Selector Switch is moved to the ON position, the
reactivation blower and burner are started and the 1800DX
begins dehumidification. The 1800DX will continue to
dehumidify in all conditions until the power is turned off.
No dehumidistat is provided to monitor process inlet air
condition (see over-dry warning section 3.5). An external
control (dehumidistat, thermostat, or other contact) can be
wired in place of the jumper across terminals 55 and 56.
The external control must be a dry contact switch designed
to operate a 115VAC circuit.
5.4 Run Light
The Run light will illuminate when the OFF-ON Selector
switch is in the ON position. This light indicates the unit
is dehumidifying. The Run light will go out if an external
control is being used and there is no demand.

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and contact with petroleum based airborne particles can
reduce the efficiency of the desiccant media. The preferred
method of cleaning is to blow dust out with compressed
air. Proper filtration and preventing contact with chemicals
will greatly improve the life of the desiccant. Inspect the
face of the media to see that no surface damage has
occurred. If damage is noticed, please contact Therma-
Stor at 1-800-533-7533 for assistance. The rotor should
turn smoothly upon the shaft, if not check the support
bearings.
6.9 Fuel Cylinder
To remove LP cylinder for inspection, recertification, or
replacement, first disconnect the copper pigtail between
the cylinder and the pressure regulator. The tank is held in
place by rods through the lifting eyes and bolts through the
floor and frame. Note that cylinder is arranged to provide
vapor withdrawal only. After reconnecting the cylinder,
perform a leak check by opening the tank valve and
probing the joints between the tank and regulator with a
flammable gas detection device or spray joints with a leak
detecting fluid (soap/water solution) and watch for any
bubbles to form. Fix any leaks before operating device.
process air inlet. The other one is located
at the reactivation air inlet.
Wash aluminum filters with fresh water.
Clean the filter from the downstream side,
forcing debris toward the filter inlet. Dry the
filter completely before installing it in unit.
Replacement filters can be ordered from the
factory or purchased locally if available.
DO NOT operate the unit without the filters
or with less effective filters as the desiccant
wheel inside the unit will become clogged
and require disassembly to clean.
6.4 Blower and Motor
Blower and motor bearings are permanently
lubricated and do not require maintenance.
Blower wheel - inspect wheel blades for
accumulation of dust and dirt. Clean
thoroughly with compressed air and or
vacuum. The wheel should not strike the
housing or the inlet ring. Make sure wheel is rotating in the
proper direction.
6.5 Drive Motor
The media drive motor is permanently lubricated and
requires no maintenance.
6.6 Rotor Drive Belt
A spring loaded tensioner keeps the belt sufficiently
tensioned. Check the belt for signs of excessive wear.
Replace as necessary.
6.7 Seals
High temperature seals separate the process and
reactivation compartments. Normally, the seals will not
require service or replacement. However, should damage
occur, or if poor performance as the result of an air leak is
suspected, the following inspection must be performed to
determine whether the seals should be replaced:
Inspection:
1) Turn the unit off and remove the access covers.
2) Visually inspect for gaps between the desiccant media
and the seals.
3) If significant gaps, wear, or damage are observed,
the seal needs to be replaced.
6.8 Desiccant Media
The silica gel desiccant media supplied with the
dehumidifier will last indefinitely under normal conditions.
Due to the nature of desiccants they make very good
filters. The life of the desiccant is directly related to the
airborne contaminates passed through it. Atmospheric
contaminants, exposure to acidic gases/or air streams,
Figure 5

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7 Panel Layout/Wiring Diagram
*Heater Circuit
*See diagram on page 8

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7 Panel Layout/Wiring Diagram
*Remove jumper & install Remote Start Contact if desired.
Heater Circuit
60 (L1)
58 (N)
24 VAC Transformer
300°
T-Stat
350°
T-Stat
React Air
Press. Sw.
Combustion
Blower
Ignition
Control
Igniter
(120 VAC) Gas Valve
(24 VAC)

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8 Troubleshooting
9 Troubleshooting
Trouble Probable Fault Probable Cause Corrective Action
1. Main power off Check main power and cable
2. Main disconnect open Close or replace disconnect
3. Selector switch open Close or replace switch
Unit Stopped
(fan off, no
heater)
Power/Control
Failure
4. Dehumidistat Repair or replace
1. Motor circuit breaker or
overload tripped
Reset circuit breaker or
overload
2. Contactor failure Repair or replace
3. Motor winding failure Repair or replace
Fan off
(Rotor turns)
Power/Mechanical
Failure
4. Fan motor failure Repair or replace
1. Excessive unconditioned make-
up air
Reduce make-up air
2. Leaking ducts or air handling
equipment outside controlled
area
Seal leaks
3. Access opening to area not
sealed
Close and seal
Excessive
infiltration of
humid air into the
controlled area
4. Area not vapor tight Seal with paint or vapor barrier
1. Dehumidistat needs
adjustment
Re-adjust
2. Improper settings Re-adjust
Faulty humidity
controls
3. Defective Replace
1. Dirty filter Clean or replace
2. Obstruction at inlet, outlet or
ducting
Remove obstruction
Inadequate air flow
3. Clogged desiccant media
(high pressure differential
across media)
Remove and replace media
rotor
1. Element failure
Check elements – repair or
replace
2. Low / no voltage
Correct power supply /
breakers
Inadequate or no
reactivation heat
3. Control elements failure
Control set point / repair or
replace
1. Air leaking into dehumidifier
Replace access door gaskets
Air seals and
gaskets
2. Air bypassing media or leaking
seals
Check media position, replace
seals
1. Chain
Repair or replace
2. Motor/gear box
Repair or replace
3. Damaged desiccant rotor
Repair or replace
Unit running
but humidity
rises
Ineffective
desiccant media
4. Contaminated or damaged
desiccant
Replace desiccant rotor
Inadequate or no 1. No Fuel Check for fuel in tank, verify
reactivation heat valves open
2. No power to ignition module Watch for igniter glow through
inspection window, verify power
to transformer and ignition
module
3. Overtemp switch failure Check continuity of overtemp
switches
4. Igniter failure If ignition module has power,
watch for igniter glow through
inspection window
5. Gas Valve Failure With gas valves OFF,
power on the device and check
for voltage at the gas valve
6. Ignition control failure Check power to ignition module,
replace if igniter outputs are
never energized and LED never
blinks (allow several minutes to
verify)
9 Troubleshooting
Trouble
Probable Fault
Probable Cause
Corrective Action
1. Main power off
Check main power and cable
2. Main disconnect open
Close or replace disconnect
3. Selector switch open
Close or replace switch
Unit Stopped
(fan off, no
heater)
Power/Control
Failure
4. Dehumidistat
Repair or replace
1. Motor circuit breaker or
overload tripped
Reset circuit breaker or
overload
2. Contactor failure
Repair or replace
3. Motor winding failure
Repair or replace
Fan off
(Rotor turns)
Power/Mechanical
Failure
4. Fan motor failure
Repair or replace
1. Excessive unconditioned make-
up air
Reduce make-up air
2. Leaking ducts or air handling
equipment outside controlled
area
Seal leaks
3. Access opening to area not
sealed
Close and seal
Excessive
infiltration of
humid air into the
controlled area
4. Area not vapor tight
Seal with paint or vapor barrier
1. Dehumidistat needs
adjustment
Re-adjust
2. Improper settings
Re-adjust
Faulty humidity
controls
3. Defective
Replace
1. Dirty filter
Clean or replace
2. Obstruction at inlet, outlet or
ducting
Remove obstruction
Inadequate air flow
3. Clogged desiccant media
(high pressure differential
across media)
Remove and replace media
rotor
1. Element failure
Check elements – repair or
replace
2. Low / no voltage
Correct power supply /
breakers
Inadequate or no
reactivation heat
3. Control elements failure
Control set point / repair or
replace
1. Air leaking into dehumidifier
Replace access door gaskets
Air seals and
gaskets
2. Air bypassing media or leaking
seals
Check media position, replace
seals
1. Chain
Repair or replace
2. Motor/gear box
Repair or replace
3. Damaged desiccant rotor
Repair or replace
Unit running
but humidity
rises
Ineffective
desiccant media
4. Contaminated or damaged
desiccant
Replace desiccant rotor
ELECTRICAL SHOCK HAZARD: Electrical
power must be present to perform some
tests; these tests should be performed only
by a qualified service person.

12 www.UsePhoenix.com • [email protected]Toll-Free 1-800-533-7533
9 Service Parts
Part No. Description
4028008 Process Blower
4028009 Reactivation Blower
4028010 Magnehelic Gauge
4020175 Humidity Control
4026866 250-300F Thermostat (121°C to 150°C)
4030171 350F Thermostat
4029768 Gas Valve
4028015 Ignition Module
4028016 Hot Surface Igniter
4028018 Burner Element
4029769 Combustion Blower
4028029 Aluminum Washable Air Filter 16X16X2 (406mm x 406mm x 51mm)
4028033 Inspection Window Glass 6X6 (152mm x 152mm)
4028559 Inspection Window Glass 4X4 (100mm x 100mm)
4028043 14” Flexible Duct 25’ long (356mm x 76.2m)
4028048 Desiccant Wheel Motor
4027307 24VAC Transformer
4028994 14” Duct Cover (356mm)
4026835 14” Duct Cover Clamp (356mm)

13 www.UsePhoenix.com • [email protected]Toll-Free 1-800-533-7533
Phoenix 1800 DX Desiccant Dehumidifier Limited Warranty
Warrantor:
Therma-Stor LLC
4201 Lien Rd.
Madison, WI 53704
Telephone: [phone]
Who Is Covered: This warranty extends only to the original end-user of the 1800 DX Desiccant
Dehumidifier and may not be assigned or transferred.
First Year Warranty: Therma-Stor Products warrants that, for one (1) year the 1800 DX will operate
free from any defects in materials and workmanship, or Therma-Stor Products will, at its option, repair
or replace the defective part(s), free of any charge.
End-User Responsibilities: Warranty service must be performed by a Servicer authorized by Therma-
Stor Products. If the end-user is unable to locate or obtain warranty service from an authorized
Servicer, he should call Therma-Stor Products at the above number and ask for the Therma-Stor
Products 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 Products’ reasonable control.
Limitations and Exclusions: If any 1800 DX 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 1800 DX is out of service while
awaiting covered warranty service).
UPON THE EXPIRATION OF THE WRITTEN WARRANTY APPLICABLE TO THE 1800 DX 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 PRODUCTS
ARE SET FORTH HEREIN, AND NO CLAIM MAY BE MADE AGAINST THERMA-STOR PRODUCTS BASED
ON ANY ORAL WARRANTY. IN NO EVENT SHALL THERMA-STOR PRODUCTS, IN CONNECTION WITH THE
SALE, INSTALLATION, USE, REPAIR OR REPLACEMENT OF ANY 1800 DX 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.