Qmark MEDH User Manual

DH Series

Portable Industrial Unit

Blower Air Heaters

Dear Owner,

Congratulations! Thank you for purchasing this new heater by Marley Engineered Products. You have made a wise invest­ment selecting the highest quality product in the heating industry. Please carefully read the installation and maintenance
instructions shown in this manual. You should enjoy years of efficient heating comfort with this product from Marley
Engineered Products... the industry’s leader in design, manufacturing, quality and service.

... The Employees of Marley Engineered Products

Installation & Maintenance Instructions

When using electrical appliances, basic precautions should
always be followed to reduce the risk of fire, electric shock
and injury to persons, including the following:

1. Read all instructions before using this heater.

2. 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 3 feet (0.9 m) from the front of the heater
and keep them away from the sides and rear.

3. Extreme caution is necessary when any heater is used by
or near children or handicapped individuals and whenev­er the heater is left operating and unattended.

4. Always disconnect heater when not in use.

5. Do not operate any heater with a damaged cord or plug
or after the heater malfunctions, has been dropped or
damaged in any manner. Return heater to authorized ser­vice facility for examination, electrical or mechanical
adjustments, or repair.

6. Do not use outdoors.

7. 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.

8. Do not run cord under carpeting. Do not cover cord with
throw rugs, runners or the like. Arrange cord away from
traffic area and where it will not be tripped over.

9. To disconnect heater, turn thermostat off, then remove
plug from outlet.

10.Connect to properly grounded outlets only.

11.Do not insert or allow foreign objects to enter any ventila­tion or exhaust opening as this may cause an electric
shock, fire or damage the heater.

12.To prevent a possible fire, do not block air intakes or
exhaust in any manner. Do not use on soft surfaces, like
a bed, where opening may become blocked.

13.A heater has hot and arcing or sparking parts inside.Do
not use it in areas where gasoline, paint or flammable liq­uids are used or stored.

14.Use this heater only as described in this manual. Any
other use not recommended by the manufacturer may
cause fire, electric shock or injury to persons.

15.This heater is not intended for use with an extension cord.

16. Save these instructions.

SAVE THESE INSTRUCTIONS

WARNING

!

ASSEMBLY INSTRUCTIONS

The DH is shipped fully assembled. The handle is assembled in
the lower position (dotted line Fig. 1). To position handle in the
upright position, remove bolts securing the handle to the support
legs, lift handle until the handle holes line up with the upper holes
in the support legs and insert bolts to secure the handle in the full
upright position.

WIRING INSTRUCTIONS

1. Use heater only on the voltage and frequency specified on
the nameplate.

2. All wiring should be done in accordance with local codes and
the National Electrical Code by a qualified person.

3. Branch circuit wire for connection to heater must be at least
90°C wire.

4. The top access panel is secured by 4 screws that must be
loosened to gain access.

5. A ground terminal is provided near the power terminal board.
The ground wire should be connected before other
connections are made.

6. Refer to Chart A for proper size “SO” grade cable.

7. A proper strain relief must be used with “SO” grade cable.

8. Dragon heaters are factory pre-wired for 3-phase delta
operation. Some units can be converted to single phase
operation by changing the wiring. Refer to Chart A for those
heaters that can be converted to single phase. The
appropriate wiring diagram is also located on the back of the
wiring compartment cover.

Risk of fire. Do not use as a residential or household heater.

a

WARNING

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Hazard of Fire or Discoloration of Temperature Sensitive
Fabrics. Do not use as a residential or household heater. Keep
combustible material and such fabrics away from heater. Do
not operate heater where flammable vapors, gases or liquids
are present. Heaters in the heat mode should not be operated
in room temperatures above 80°F. Fan motor is not designed
to operate in ambients below -40°F.

To avoid personal injury read “IMPORTANT INSTRUCTIONS”
before installation or operation of heater.

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WARNING

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Keep electrical cords and combustible materials, such as
drapes and other furnishings, away from heater.

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WARNING

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Bolt ( )

Nut ( )

Support Leg

Handle

Direction of

Airflow

Figure 1

ELECTRIC SHOCK HAZARD. Disconnect all power before
installing or servicing heater. Failure to do so could result in
personal injury or property damage. Heater must be effectively
grounded in accordance with the National Electrical Code,
NFPA 70.v

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WARNING

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2

Fits Cable Dia. Plug Type Model Description Volts Amps Configuration NEMA # ANSI #

.385”-.780” Locking LPS25124 3 Pole, 4 Wire 250 20 L15-20 C73.85

.385”-.780” Locking LPS25103 3 Pole, 4 Wire 250 30 L15-30 C73.86

.595”-1.150” Locking LPS25104 3 Pole, 4 Wire 480 30 L16-30 C73.88

.595”-1.150” Locking LPS25084 3 Pole, 4 Wire 600 30 L17-30 C73.89

.750”-1.125” Locking LPS25083 2 Pole, 4 Wire 600 50 — —

.750”-1.125” Locking LPS25064 3 Pole, 4 Wire 600 50 — —

.625”-1.187” Non Locking NPS25650 2 Pole, 3 Wire 250 50 6-50 C73.53

.390”-.775” Non Locking NPS1520 3 Pole, 4 Wire 250 20 15-20 C73.59

.750”-1.250” Non Locking NPS1550 3 Pole, 4 Wire 250 50 15-50 C73.61

Plug Specifications

G

G

W

X

Z

G

W

X

Z

X

G

Y

Z

X

G

Y

Z

X

G

Y

Z

X

G

Y

Z

Y

X

G

Y

X

Z

WIRING 25 FT OPTIONAL PLUGS
MODEL DIAGRAM SHIP WIRE CORD LOCKING NON-LOCK
NUMBER KW VOLTS BTUH PH AMPS NUMBER WT. SIZE SET TYPE TYPE

DH1021C* 10 240 34,120 1 41.7 N/A 65 lbs N/A Included* - Included
DH0783 7.5 208 25,590 1 36.3 1A 65 lbs 8/3 CS25083 - NPS25650

3 21 1 10/4 CS25104 LPS25103 NPS1550

DH1023 10 240 34,120 1 40.8 1A 65 lbs 6/3 CS25063 - NPS25650

3 23.6 1 10/4 CS25104 - NPS1550
DH1583 15 208 51,180 3 41.8 1 65 lbs 6/4 CS25064 - NPS1550
DH1523 15 240 51,180 3 36.3 1 65 lbs 8/4 CS25084 - NPS1550
DH1521 15 240 51,180 1 62.5 1A 65 lbs 4/4 CS25044 - NPS1550
DH1543 15 480 51,180 1 31.4/18.2 2A 65 lbs 8/3 CS25083 LPS25083 -

3 2 12/4 CS25124 LPS25104 ­DH2043 20 480 68,240 1 41.6/24.4 4A 75 lbs 6/3 CS25063 LPS25083 -

3 4 10/4 CS25104 LPS25084 ­DH3043 30 480 102,360 3 36.3 4 75 lbs 6/4 CS25064 LPS25064
DH3063 30 600 102,360 3 29.1 4 75 lbs 8/4 CS25084 LPS25084

*Model DH1021C is shipped with 10 ft. power cord and plug.

Note: All units are factory wired for 3 phase operation. Models designated 1 and 3 phase can be field wired for single phase operation.

Chart A