Qmark GUX User Manual
Horiz. Air
Discharge Wt.
kW Voltage and Phase (Ft.) BTUH CFM (Lbs.) A B C D E
3
208/240V-1 or 3Ø
28 10,236 700 127 19-1/8 23-7/8 21 3-1/2 13-5/8
480/575V-3Ø
5
208/240V-1 or 3Ø
28 17,060 700 127 19-1/8 23-7/8 21 3-1/2 13-5/8
480/575V-3Ø
7.5
208/240V-1 or 3Ø
32 25,590 840 133 19-1/8 23-7/8 21 3-1/2 13-5/8
480/575V-3Ø
10
240V-1 or 3Ø
32 34,120 840 138 19-1/8 23-7/8 21 3-1/2 13-5/8
208/480/575V-3Ø
15
208/240/480V
47 51,180 1450 150 25 27-7/8 21 4-13/32 17-5/8
575V-3Ø
18 240V-3Ø 43 61,420 1400 165 25 27-7/8 21 4-13/32 17-5/8
20 480/575V-3Ø 43 68,240 1400 165 25 27-7/8 21 4-13/32 17-5/8
25 480/575V-3Ø 54 85,300 2330 200 32-1/8 31-7/8 21-3/4 5-1/2 21-5/8
30 480/575V-3Ø 54 102,360 2330 200 32-1/8 31-7/8 21-3/4 5-1/2 21-5/8
35 480/575V-3Ø 54 119,420 2330 200 32-1/8 31-7/8 21-3/4 5-1/2 21-5/8
Class I
Group C & D, Div. 1 & 2
Class II
Groups E, F & G
T3B - 165°C (329°F)
Table A Specifications
SALES
X Series (Model B)
Explosion Proof
Heater
SAVE THESE INSTRUCTIONS
11-1/16
C
A
D
B
A
E
2
2
Overall Dimensions
(In.)
5/8 UNC Tapped
Mounting Hole
Locations
REFERENCE
5200-2474-000
161-302421-006
DATE
MAY, 2002
INSTALLATION, OPERATION
RENEWAL PARTS IDENTIFICATION
2
Read Carefully - These instructions are written to help you prevent difficulties that might arise during installation of heaters.
Studying the instructions first may save you considerable time and
money later. Observe the following procedures, and cut your
installation time to a minimum.
TO REDUCE RISK OF FIRE AND ELECTRIC SHOCK:
1. To reduce the risk of ignition of hazardous atmospheres:
In accordance with the National Electrical Code, do not install
where operating temperature code exceeds the ignition temperature of the hazardous atmosphere. Use only in atmospheres
having an ignition temperature higher than 165°C (329°F).
2. Disconnect from supply circuit before opening enclosures.
3. Hazard of Electric Shock. Heater must be effec-
tively grounded in accordance with N.E.C. to
eliminate shock hazard.
4. Heat exchanger contains Propylene Glycol under pressure at
operating temperature. A material safety data sheet (MSDS) is
available from Marley upon request. Should leakage occur,
remove unit from service and investigate cause.
5. Keep all electrical enclosure covers tightly closed and secured
with all bolts and threads. Cover joints must be clean before
replacing covers.
6. Install and operate in upright position only. Refer to Figure 3
for level requirements. Failure to comply will cause overheating of the element and shutting down the unit by tripping the
high temperature cutout.
7. All unused threaded openings not used for supply wiring must
be fitted with threaded plugs approved for use in hazardous
locations.
8. All unit electrical installation fittings, conduit, wiring and seals
must meet NEC and local codes for hazardous locations.
9. External line fusing or circuit breaker protection is required.
10. Hi limit cutouts must never be bypassed in the control circuit.
11. Alarm pilot lamp, if supplied, will turn on if the high limit con-
trol actuates. Steady on lamp indicates manual reset protector
has tripped. This could result if the heat exchanger is obstructed (dirty), inlet air restricted or fan not turning. Shut off power
to unit and refer to repair procedures section of instruction
sheet.
12. Mounting clearances on nameplate must be observed.
13. Use copper wire for supply connections according to size and
rating on nameplate.
14. Do not install any type of gasket material on any of the electri-
cal junction box cover surfaces.
15. Do not attempt to override louver stops or operate unit with
louvers fully closed.
GENERAL
The X-Series units rated 3 through 35 kW are designed for
operation in Class I, Div. 1, Group C & D and Class II, Div. 1,
Groups E, F and G hazardous atmospheres having an ignition temperature of 165°C (329°F) or higher. They are designed for comfort heating and should not be operated in ambient temperatures
exceeding 40° (104°F). All units in Table A are UL listed. The
units are easily adapted for wall, ceiling or pole mounting. Refer
to Figure 4 on Page 3 for mounting information. They are supplied
with either 24 or 120V internal control circuit voltage. The heater
is designed for use with an external hazardous location thermostat
or optional built-in thermostat.
The standard heater is designed to operate up to 7500 feet
(2286 m) altitude. Consult factory for specific recommendations when using the units at higher altitudes.
Heavy gauge adjustable
louver with minimum
opening stops - to direct air flow
Removable front cover
for ease of cleaning
High efficiency heat exchang-
er with integral
aluminum-finned steel tubes
Optional service light to
indicate when unit
needs servicing
Built-in 120V control cir-
cuit transformer
(Optional 24V available)
Heavy duty immersion heater assembly
with manual reset limit control and NEMA
7 and 9 terminal enclosure
Protective housing for
immersion heater ter-
minal enclosure
Convenient terminal
block for room
thermostat connection
Motor connections
wiring access
Explosion-proof
(NEMA 7 and 9)
controls enclosure
Integral, heavy duty
magnetic contactor
Explosion
proof motor
Mounting bolt hang-
er connections
Polyester powder-coated
heavy gauge steel corrosion
resistant cabinet
Overpressure
protection device
The heaters may be mounted at any convenient height above
floor. The minimum spacings shown in Figure 4 should be maintained to adjacent walls and ceiling. If floor heat is desired, do not
mount higher than 8 to 10 feet above floor.
Controlling thermostats to individual heaters should be mounted at shoulder height on inside walls or columns and clear of the
discharge air stream of the unit. Allow at least 4 in front of heater
for air stream to discharge freely.
Do not mount mercury type thermostat directly on unit, vibration could cause malfunction.
Heater may be mounted on a shelf or stand from the bottom. Be
sure that mounting clearances are maintained and that bottom of
unit has at least 1 clearance underneath it. This is necessary for
good air circulation and servicing of heat exchanger. All mounting
methods must allow for removal of front cover.
The mounting and anchoring provisions must take into account
the unit vibration and cantilevered loading when wall or pole
mounted. One of the Marley mounting kits shown in Figures 5, 6
and 7 must be used whenever possible.
INSTALLATION
Fire/Explosion Hazard. Mount only in upright position and observe nameplate mounting clearances.
Heater Location instructions:
Arrange units so their discharge air streams:
A. are subjected to a minimum of interference from columns,
machinery and partitions.
B. wipe exposed walls without blowing directly at them.
C. are directed away from room occupants in comfort heating.
D. are directed along the windward side when installed in a build-
ing exposed to a prevailing wind.
Locate thermostat on interior partition walls or posts away
from cold drafts, internal heat sources and away from heater discharge air streams.
Small rooms can be heated by one unit heater. Where two walls
are exposed, the heater should be mounted as shown in Figure 2.
Large rooms require multi-unit installations. Number and capacity
of units will be determined by volume of building and square feet
of floor area to be heated. Arrange units to provide perimeter air
circulation where each unit supports the air stream from another.
The X-Series hazardous location heaters are designed for use
only in a permanently mounted upright position. We recommend
the use of a mounting kit (ceiling, wall or pole) available from
Marley. (Figures 5, 6 and 7)
The ceiling or wall mounting surface and the anchoring provision must be sufficient to support the combined weights of the unit
and mounting hardware.
If using mounting hardware or a supporting structure not supplied by Marley, the unit should be suspended from the supporting
structure thru the two mounting points on top of the unit with 5/8
NC bolts and lockwashers. If single point mounting is desired,
order the correct size Marley adapter bracket (P/N 027-302361001 for 12” fan units, P/N 027-302361-002 for 16” fan units) and
P/N 027-302361-003 for 20” fan units. This bracket is designed to
hold the unit over its center of gravity with a 1 dia. bolt. The maximum tilt angles as shown in Figure 3 must not be exceeded in
either direction during operation and installation. Failure to comply will cause high limit shut down.
Figure 3
Maximum Out of Plane Allowance
Installation Clearances
Figure 4
EXPOSED
EXPOSED
EXPOSED
EXPOSED
EXPOSED
EXPOSED
Figure 2
3
1/2" Max.
4" Min.
1/2" Max.
4"
5/8 NC (2)
Thds. For
Mounting
Min.
2"
Min.
8"
4
MOUNTING KITS
Figure 5
Figure 7
Figure 9
Figure 6
Figure 10
Wall Mount Kit
Model # XMB-12 12 Fan (3-10 kW)
Model # XMB-16 16 Fan (15-20 kW)
Model # XMB-20 20 Fan (25-35 kW)
Pole or Wall Mount Kit
Model # XPM-12 12 Fan (3-10 kW)
Model # XPM-16 16 Fan (15-20 kW)
Model # XPM-20 20 Fan (25-35 kW)
Ceiling Mount Kit
Model # XCMOB
P
12 Fan - 16-3/4
16 Fan - 18-1/2
20 Fan - 22
Wall
Bracket
1ø Hardware % Bolt
Single Point
Swivel Mount
Supplied
1/2 ø Hardware
Not Supplied
Adapter Bracket
& 5/8 NC Hardware
Supplied
5-1/2 - 12 Fan
5-1/8 - 16 Fan
6-3/8 - 20 Fan
3 through 10 kW P=10
15 through 20 kW P=11-1/2
25 through 35 kW P=14-1/2
4-7/8
4-9/16
Swivel Ceiling
Hanger S/A &
Hardware
5/8 ø Hex
Nuts & Washers
Cust. Supplied ø 1/2 Mounting
Hardware. Bracket Spacing
suitable for use with 4 U-Bolts
Supplied for
Installation
Top & Bottom
ø 5/8 Rods Length to
suit 1 Min. Threaded
Ends Customer Supplied
Pole Base
➀
3/8 ø Hardware
Required for
Mounting Cust. Supplied
6 Ref.
3-1/2 SCH. 40 Pipe
or 4 O.D. X .25 Wall
Tube Cust. Supplied
Length to Suit
P
Adapter Bracket
Supplied
with 5/8 Bolts
Single Point
Swivel 4ø
Supplied
➂
➁
Pole Support
Bracket
Heater Mounting
Bracket Arm &
Hardware
ø 3/8 Hardware
Cust. Supplied
ø 1/2 x 4 U-Bolts
& Hardware
Cust. Supplied
5/8-11 Threaded
Mounting Holes (2)
1/2 NPT
Thermostat Entry
1 NPT
Top Line Supply
Entry
Unit Top View
Electrical
Components
Pilot Lamp (Opt.)
Transformer
1 NPT
Jumper Wire
Contactor
Heat
Exchanger
Wiring
Compartment
3 through 10 kW P=10
15 through 20 kW P=11-1/2
25 through 35 kW P=14-1/2
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