Quest Engineering EHS 20 Pro Manual
Quest Power Electric Heat EHS 20 Pro
PN 4033330
The Quest Power Electric Heat EHS 20 Pro portable, heavy duty electric heater features multiple power
receptacles for connection to common 120VAC outlets. The Power Electric Heat EHS 20 Pro can produce
up to 20,000 Btu of clean, safe heat at 250 CFM. Internal temperature cutouts prevent the Power Electric
Heat EHS 20 Pro from overheating the space, while the Power Electric Heat EHS 20 Pro’s remote thermostat
provides a means to control the heat up to 25’ away.
Quest Power Electric Heat EHS 20 Pro:
• Listed by ETL to UL Safety Standards
• 15 Amp Operation at 120VAC up to 4 independent
circuits (20,000 Btu)
• Remote Thermostat with 25’ connecting wire
(included with unit)
• Standard MERV-11 air filter included
• Multiple ducting options
• 8” Outlet Duct, 8” Inlet Duct Optional
• Stainless Steel Cabinet
• Double-Walled, Screened Enclosure for heating
elements
• Automatic Internal 140°F Safety Thermal Cutout
• Stackable for easy storage and transportation
Installation, Operation and Maintenance InstructionsInstallation, Operation and Maintenance Instructions
4201 Lien Rd. Phone 608-237-8400
Madison, WI 53704 Toll-Free 1-866-933-7486
– Read and Save These Instructions –
Specications subject to change without notice. TS-738
02/15
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Quest DRY150
Quest Power Electric Heat EHS 20 Pro
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Quest Power Electric Heat EHS 20 Pro Installation, Operation and Maintenance Instructions
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Table of Contents
Introduction.................................................................... 1
1. Specifications ........................................................... 4
2. Operation ................................................................. 4
2.1 Transporting ....................................................... 4
2.2 Electrical Requirements ...................................... 4
2.3 Ducting............................................................... 5
2.4 Control Panel ..................................................... 5
3. Maintenance............................................................. 6
3.1 Air Filter ............................................................. 6
4. Service ..................................................................... 7
4.1 Technical Description ......................................... 7
4.2 Troubleshooting ................................................. 7
5. Options and Accessories .......................................... 8
6. Wiring Diagram ....................................................... 8
7. Service Parts ............................................................ 9
Warranty ............................................................... 10
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 benet from
your Quest Power Electric Heat EHS 20 Pro.
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Quest Power Electric Heat EHS 20 Pro Installation, Operation and Maintenance Instructions
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• Read all instructions before using this heater.
• DO NOT OPERATE near children or invalids.
• This heater is hot when in use. To avoid burns, do not let bare skin touch hot surfaces. If provided, use
handles when moving this heater. Keep combustible materials, such as furniture, pillows, bedding,
papers, clothes, and curtains at least 36” (.91 m) from the front of the heater and keep them away from
the sides and rear.
• For temporary use only, not for comfort heat. See NFPA 70 Article 590.
• Always unplug unit when not in use.
• DO NOT OPERATE with damaged cord, plug, or after unit malfunctions, has been dropped or damaged
in any manner. Return to authorized service facility for examination or repair.
• Unit Intended for INDOOR USE ONLY; DO NOT USE OUTDOORS.
• This heater is not intended for use in bathrooms, laundry areas and similar indoor locations. Never
locate heater where it may fall into a bathtub or other water container.
• DO NOT run cord under carpeting. Do not cover cord with throw rugs, runners, or similar coverings.
Do not route cord under furniture or appliances. Arrange cord away from trafc area and where it will
not be tripped over.
• To disconnect device, turn controls off, then remove plug from outlet.
• Connect ONLY to properly grounded GFCI outlets.
• DO NOT insert or allow foreign objects to enter any ventilation or exhaust openings as this may cause
an ELECTRIC SHOCK or FIRE, or damage the heater.
• To prevent a possible re, do not block air intakes or exhaust in any manner. Do not use on soft
surfaces, such as a bed, where openings may become blocked.
• Device has hot and arcing or sparking parts inside. Do not use in areas where gasoline, paint, or
ammable liquids are used or stored.
• Use device only as described in this manual. Any other use not recommended by the manufacturer
may cause re, electric shock, or injury to persons.
• Cords used for 120V service shall be No. 12 AWG minimum size rated not less than 1440 Watts.
SAVE THESE INSTRUCTIONS
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Quest Power Electric Heat EHS 20 Pro Installation, Operation and Maintenance Instructions
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1 Specifications
Part No. 4033330
Power Blower Circuit: Amp at 120VAC 60Hz, 1 Phase
120VAC 60Hz, 1 Phase Heater Circuits (up to 4):
12 Amp / circuit = 9°F temperature rise/circuit: 5,000 Btu
Maximum Heat: 20,000 Btu with 80°F Maximum Temperature Rise
Blower 250 CFM
Filters Pleated Media MERV-11
Duct Options Outlet – 8” Flex-Duct
Warranty 1 year 100% of Parts and Labor
Dimensions
Unit Shipping
Width 13” 17”
Height 12.5” 17”
Depth 26” 30”
Weight 35 lb 42 lb
2 Operation
2.1 Transporting
The Quest Power Electric Heat EHS 20 Pro must always be upright when transported by
vehicle. EHS 20 is equipped with rubber corners to permit stacking for storage. If units are
transported, they need to be secured with restraining straps to prevent damage and possible
injury.
2.2 Electrical Requirements
The Quest Power Electric Heat EHS 20 Pro requires a 120VAC outlet to power the onboard blower, control
and rst heater circuit. Three additional heating elements are separately powered by additional cords and
receptacles.
120VAC heating elements each require cord connection to appropriate receptacles rated at 15A or more.
One cord and receptacle are required per heating element. Power cords should be appropriately sized
(typically #12 minimum). Each heater cord should have a three-blade grounding-type plug as shown. An
adapter is available for connecting to two-slot receptacles. The green grounding lug extending from the
adapter must be connected to a permanent ground such as a properly grounded outlet box. The adapter
should not be used if a three-slot grounded receptacle is available.
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Quest Power Electric Heat EHS 20 Pro Installation, Operation and Maintenance Instructions
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2.3 Ducting
The Quest Power Electric Heat EHS 20 Pro can be ducted at the inlet, the outlet or both. The Power Electric
Heat EHS 20 Pro inlet and outlet duct are designed to accommodate 8” exible duct. When selecting
exible ducting keep in mind anticipated outlet temperatures. Air temperature increase is typically 50
to 80 degrees F. Adding ducting decreases airow which can increase outlet temperatures by up to 40
additional degrees F.
NOTE: It is strongly discouraged to use Mylar ducting as this could burn and cause a re.
2.4 Control Panel
Fan Mode Switch: This switch allows the user to operate in ‘FAN ON’ or ‘FAN AUTO’ mode. In ‘FAN ON’
mode, the blower will remain on whenever the unit is energized. This mode is recommended for normal
operation where constant air circulation is desired. In ‘FAN AUTO’ mode, the blower will only energize
when there is a demand for heat from the remote thermostat connection. To use this mode, the CONTROL
POWER switch must be set to ‘THERMOSTAT CONTROLLED.’ This mode is recommended for applications
that do not require constant air circulation during heating.
Control Power Switch: The CONTROL POWER switch performs two functions. It controls the master power
to the Compact 20, and it allows the user to select from an internal or external thermostat. In ‘ALWAYS
ON’ mode, the Compact 20 uses an internal thermostat preset at 140F. Heat will continue to be produced
until the air owing into the inlet reaches 140F. In ‘THERMOSTAT CONTROLLED’ mode, the Compact 20
looks for a closed circuit at the THERMOSTAT connection on the front of the control panel. Any dry contact
switch or the included remote thermostat with 25’ of wire can perform this function.
Start/Reset Switch: The START/RESET Switch is used to enable the Compact 20 to produce heat. If at any
time power to the control circuit is lost or if a fault condition occurs, the Compact 20 will go into the
FAULT/NOT RUNNING mode. Pushing the START/RESET switch will energize the control circuit and restart
the Compact 20.
Grounding Pin
Plug Adapter Outlet
Grounding
Means
Metal
Screw
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OK/Running Lamp: The OK/RUNNING lamp will illuminate when the control circuit is energized. If the
lamp is lit, the Compact 20 is under the control of either the internal or external thermostat (depending
on which thermostat is selected with the control power switch). In this state, the heater will be on until it
reaches cycling temperatures (130F-140F) and will then self-regulate at this range.
FAULT/NOT RUNNING Lamp: If the FAULT/NOT RUNNING lamp is lit, the contactor control circuit is
not energized, which will disable the heater circuits and no heat will be produced.
Hour Meter: The digital hour meter measures the cumulative time that the unit is turned on to tenths of
an hour. It stores and displays the total when the unit is unplugged. It resets to zero after 99,999.9 hours
of operation.
Heat ON/OFF Switches: These switches individually control the heating elements. Each switch connects
and disconnects the power from the receptacle next to it. These switches are lighted to indicate when
power is connected and the corresponding heating element is on.
Remote Thermostat Connection: There are two spring loaded terminals for connecting the thermostat
wiring on the control panel. Connect one wire to each terminal. For applications where the FireBird
Compact 20 is placed outside the space to be heated (e.g. ducting heat into a chamber), the 25’ cord
allows you to place the thermostat inside the heated space.
In addition to the included thermostat, any dry-contact switch or other type of control that connects the
terminals together will cause the heating elements to run. The thermostat circuit is low voltage (24VAC).
DO NOT CONNECT POWER TO THE THERMOSTAT TERMINALS.
Control Power Switch: The Master Power Switch located on the center-top of the control panel can be
used to turn the unit ON, OFF, or set the unit to be controlled by an external thermostat.
When set to ON, the Compact 20 will energize the blower and close the heater contactors continuously.
Depending on the connected power sources, the corresponding heater elements will be energized. In this
mode, the Compact 20 is limited to 140°F incoming air temperature by an internal thermostat.
When set to THERMOSTAT, the blower will run continuously, but the heating contactors will only
energize when the thermostat terminals (located on the lower right of the control panel) are connected by
a switch, remote thermostat, timer, etc.
3 Maintenance
3.1 Air Filter
The Quest Power Electric Heat EHS 20 Pro is equipped with a pleated fabric air lter that must be
checked regularly. The standard lter is a MERV-11 high efciency lter. Operating the Power Electric
Heat EHS 20 Pro with a dirty or obstructed lter will reduce airow eventually causing the heating
element to shut off. Installing a clean lter or removing the obstruction to restore airow will allow the
heating element to operate again.
The lter can generally be vacuumed clean several times before needing replacement. Replacement
lters can be ordered from the factory or purchased locally if available.
WARNING: DO NOT operate the unit without the lter or with a less effective lter as the heating coils
inside the unit could become clogged and require disassembly to clean.
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Quest Power Electric Heat EHS 20 Pro Installation, Operation and Maintenance Instructions
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4 Service
WARNING: Servicing the Quest Power Electric Heat EHS 20 Pro with its high voltage circuitry presents a
health hazard which could result in death, serious bodily injury, and/or property damage. Only qualied
service people should service this unit.
Do not operate the unit without the front cover in place. High voltage is present, heater burnout may
result.
4.1 Technical Description
The Quest Power Electric Heat EHS 20 Pro uses a wound nichrome heating element to provide multiple
heat settings depending on application requirements or available power. The heating elements are operated
by a 24VAC control circuit and a number of relays and contactors. For safety, there is an air pressure
switch that will shut the heating elements off or prevent the heating elements from coming on if airow is
restricted at either the inlet or the outlet. An additional safety switch limits the incoming air temperature
to approxmiately 140°F. This switch shuts off the heating elements and automatically resets when the
temperature falls to approximately 130°F.
4.2 Troubleshooting
Low voltage heating circuits require dedicated 15A minimum service for each circuit (up to 4 total).
Blower not running
1. Unit unplugged, no power to outlet
2. Control Switch not working
3. Wiring fault inside device
4. Defective blower or blower capacitor
Blower running but no heat when Ok/Running lamp is on
1. Power switch is set to “Thermostat” and no thermostat is connected, or thermostat is open
2. High temperature limit reached (140°F)
3. Heating relays not operating
4. Wiring fault inside device
5. Defective heating element, pressure switch, or temperature limit switch
Fault/Not Running lamp illuminated
1. Press Start/Reset button
2. Reduce the length of inlet or outlet duct (if ducted)
3. Check duct for kinks or sharp bends in inlet or outlet (if ducted)
4. Impeller is obstructed or slow
5. Voltage is low
6. Create openings in heated cavities to reduce backpressure.
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Quest Power Electric Heat EHS 20 Pro Installation, Operation and Maintenance Instructions
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5 Options and Accessories
4033895 Duct Kit, Compact Heater, 8” inlet (no ex Duct)
4027415 8” x 25’ Flex Duct
4032773 Cord Kit, (2) 25’ Lighted Cords & (2) 50’ Lighted Cords
4030671 9” x 11 3/8 x ¾” Mini-Pleated MERV-11 Filter
4030733 Filter Package, 12 PK; 9” x 11 3/8 x ¾” Mini-Pleated MERV-11 Filter
4033734 Filter Package, 4 PK; 9” x 11 3/8 x ¾” Mini-Pleated MERV-11 Filter
4030115 Reed LM 8000 Multi-Function Meter
6 Wiring Diagram
BRN
BLK
REMOTE
THERMOSTAT
15A #1
MASTER POWER
15A #2 POWER
15A #3 POWER
15A #4 POWER
#2 CIRCUIT
POWER SWITCH
#3 CIRCUIT
POWER SWITCH
#4 CIRCUIT
POWER SWITCH
MASTER POWER
SWITCH
HOUR METER
#2 HEATER CIRCUIT
1500 WATTS
#3 HEATER CIRCUIT
1500 WATTS
#4 HEATER CIRCUIT
1500 WATTS
#1 HEATER CIRCUIT
1250 WATTS
HEATER
SWITCH
#1
HEATER
SWITCH
#2 PUSH TO
START
RED TROUBLE
INDICATOR
LIGHT
GREEN OK
INDICATOR
LIGHT
AIR
TEMPERATURE
THERMOSTAT
A B
RELAY
R 3
RELAY
R 1
RELAY
R 2
A
A
B
B
28 VAC
TRANSFORMER
HEATER
SWITCH
#1
HEATER
SWITCH
#2
PUSH TO
START
BLU
GRN
BRN
BLK
BLU
GRN
HOUR METER
CAPACITOR
MASTER POWER
SWITCH
CIRCUIT POWER
SWITCH RELAY
CONTACT
(R1B) (R2A) (R2B)
R1A 1250 WATT
HEATER #1
28 VAC
PRIMARY
1500 WATT
HEATER #2-4
RELAY 3
COIL
R3
AIR TEMPERATURE
THERMOSTAT
R1
R2
R3A
R3B
R3B
RELAY 1
COIL
RELAY 2
COIL
RED TROUBLE
INDICATOR
LIGHT
GREEN OK
INDICATOR
LIGHT
24VAC SECONDARY
LADDER DIAGRAM
120VAC
CIRCUIT #1
120VAC
CIRCUIT #2-4
REMOTE
THERMOSTAT
MASTER POWER
SWITCH
PN 4034884 REV A
24VAC
CONTROL
CIRCUIT
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Item Description QTY Part No.
1 Flanged 120V Inlet 4 4027258
2 Master Power Switch 1 4030941
3 Rocker Switch 1 4021796
4 Hour Meter 1 4028795
5 Foot 8 4032784
6 Heat On/Off Switches 3 4021822
7 Spring Connector 1 4032765
8 Green Indicator Light 1 4034878
9 Red Indicator Light 1 4034886
Item Description QTY Part No.
10 Blower 1 4032769
11 Thermostat 1 4030614
12 10mfd Capacitor 1 4033031-05
13 24VAC Transformer 1 4022487
14 Relay, DPDT 3 4029575
15 Heater Element 1 4034885
16 Tinnerman Clip 10 4032761
7 Service Parts
9
1
2
3
4
5
678
10
11
12 13 14 15 16
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Quest Power Electric Heat EHS 20 Pro Installation, Operation and Maintenance Instructions
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Quest Power Electric Heat EHS 20 Pro Limited Warranty
Warrantor:
Therma-Stor LLC
4201 Lien Rd
Madison, WI 53704
Telephone: 1-866-933-7486
Who Is Covered: This warranty extends only to the original end-user of the Quest Power Electric Heat EHS 20 Pro, and
may not be assigned or transferred.
Year One: Therma-Stor LLC warrants that, for one (1) year the Quest Power Electric Heat EHS 20 Pro 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.
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, modication, 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 Quest Power Electric Heat EHS 20 Pro 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 Quest Power Electric Heat EHS 20 Pro is out of service while awaiting
covered warranty service).
UPON THE EXPIRATION OF THE WRITTEN WARRANTY APPLICABLE TO THE Quest Power Electric Heat EHS 20 Pro 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 Quest
Power Electric Heat EHS 20 Pro 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 specic legal rights, and you may also have other rights which vary from state to
state.
Other manuals for EHS 20 Pro
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