Qmark MSDH User Manual
Specifications – Table 1
Electrical Data (50 Hz) Dimensions (In)
Model
Volts kW Phase Amps BTU Height Width Depth
SDH3043 480 30 3 37.2 102,360 38.5 26 44
SDH3093 600 30 3 30.0 102,360 38.5 26 44
SDH4843 480 48 3 58.9 163,776 38.5 30-1/4 44
SDH4893 600 48 3 47.3 163,776 38.5 30-1/4 44
SDH6043 480 60 3 73.3 204,720 38.5 30-1/4 44
SDH6093 600 60 3 58.9 204,720 38.5 30-1/4 44
Portable High
Temperature
Blower Heater
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
Attention: Do not operate this heater in
explosive areas.
2
WARNING - IMPORTANT SAFTY 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 (0.9m) 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 cable 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, 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. Do not use as a residential or household heater.
17.
SAVE THESE INSTRUCTIONS.
WIRING
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.
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 Table A for proper size “SO” grade of cable.
7. A proper strain relief must be used with “SO” grade cable.
8. Heaters are factory pre-wired for 3-phase delta operation. Some
units can be converted to single phase operation by changing the
wiring. The appropriate wiring diagram is also located on the back
of the wiring compartment cover.
Cord Preparation for Portable Heaters
1. Determine the gage and number of conductors from the tabulation
below using amps and phase from the heater nameplate. It is not
recommended that cord exceed 50 feet in length.
Model Number Volts kW Phase Amps Min Wire Size
SDH3043 480 30 3 37.2 6 Ga
SDH3063 600 30 3 30.0 8 Ga
SDH4843 480 48 3 58.9 4 Ga
SDH4863 600 48 3 47.3 4 Ga
SDH6043 480 60 3 73.3 2 Ga
SDH6063 600 60 3 58.9 4 Ga
SET-UP AND OPERATION
Heaters in the heat mode should not be operated in room tempera-
tures above 130˚F. Fan motor is not designed to operate in ambients
below -10˚F. The SDH is designed to be used with 20” diameter flexible duct. A feature of the heater is that the fan speed can be easily
adjusted from 1500 to 2300rpm, (SDH heaters are shipped from the
factory with the fan speed set at 1800 rpm). The maximum external
static load for the blower is .38” H
2
O, regardless of the fan speed
selected. The outlet temperature is controlled by a built-in thermostatic control; the maximum outlet temperature is a function of the kW rating and the amount of air (cfm) flowing through the heater. The addition of flexible duct will provide additional static load, resulting in a
lower cfm, the lower air flow will reaise maximum outlet temperature
until the static load reaches .38”H
2
O. Exceeding the maximum static
load will result in the tripping of the overtemperature control. The performance range of the SDH units is as shown in table B.
The motor and fan have variable pitch pulleys for changing the air
flow and the ∆T. Graphs 1, 2 and 3 provide the performance data for
each size heater at the recommended minimum, medium and maximum fan speeds. The curves end at the point where the .38” H
2
O static load has been reached. The temperature rise is based on using
Marley 20” diameter SDHFX20 flexible duct. The performance curves
were determined by actual testing; therefore using flexible duct not
supplied by Marley may vary the results. The introduction of bends in
the ducting will add static load equivalent to adding 15 feet of duct
length for each 90˚ bend and 25 feet of duct length for each 180˚ bend.
∆ T Max. ∆T at Max.
kW Fan RPM CFM No Load Static Load Static Load
30 1800 2200 42˚F .38” H2O86˚F
48 1800 2200 68˚F .38” H2O 144˚F
60 1800 2200 88˚F .38” H2O 170˚F
Table A
Table B
3
WIRING (cont’d.)
ACCESSORIES
Temperature Rise vs Duct Length
60 kW
100
60
40
20
0
0
100
75
50
25
125
150
175
Duct Length in Feet
Temperature Rise ˚F
120
140
160
1800
RPM
2200
RPM
1500
RPM
80
180
200
SDH heaters can be easily field if modified to vary the fan speed.
There may be some circumstances where the use of short lengths of
duct may not create sufficient pressure drop to achieve the desired temperature rise. This may also be the case of using the unit without a duct.
This insufficient static pressure drop may result in high air flow, with
the maximum temperature rise below the desired level, (even after the
fan speed has been reduced to the minimum rpm). An accessory
SDHAD, adjustable damper, is available and can be attached to the
heater to produce a static load, ranging from .1” to .19” H
2
O which will
act to reduce the amount of air flow.
The “Friction Loss” Graph 4 provides the actual test data on the
friction loss for the ADHAD damper attachment. The losses are stated
as the equivalent length in feet of 20” duct.
The SDH Dragon includes 2 thermostats. The thermostat on the air
inlet end of the unit is for the minimum air temperature desired. The
thermostat on the discharge end of the heater is for the maximum air
temperature desired. The two thermostats are wired in series with the
heating element contactor coil. The temperature range of both thermostats is 60 - 180˚F.
Adjustable Damper and Duct Adaptor
Rear of
Heater
Front of
Heater
Adjustable
Damper
1/4-20 Wing nut
Provided with
SDHAD
Duct
Adapter
100
75
50
25
Temperature Rise ˚F
0
0
25
Temperature Rise vs Duct Length
160
140
120
100
80
60
40
Temperature Rise ˚F
20
0
0
1500
RPM
25
Temperature Rise vs Duct Length
30 kW
1500
RPM
50
75
Duct Length in Feet
48 kW
75
50
Duct Length in Feet
2200
RPM
100
100
2200
RPM
1800
RPM
1800
RPM
125 150
125
150
175
175
Friction Loss SDHAD Damper
90
80
70
60
50
40
30
20
Equivalent Duct Length FT
10
0
1400
Damper Full Open
1600
Damper Full Closed
1800
2000
Fan RPM
2200
2400
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