Qmark MUH User Manual [en, es, fr]
MUH Series
Modular Unit Heaters
FILE #E21609
Installation, Operation & Maintenance Instructions
Dear Owner,
Congratulations! Thank you for purchasing this new heater manufactured 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
WARNING
Read Carefully
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 mounting time to a minimum.
To reduce risk of fire or electric shock:
1. To prevent electrical shock, disconnect all power coming to
heater at main service panel before wiring or servicing.
2. All wiring must be in accordance with the National and
Local Electrical Codes and the heater must be grounded as
a pre-caution against possible electric shock.
3. Verify the power supply voltage coming to heater matches
the ratings printed on the heater name plate before energizing.
4. This heater is hot when in use. To avoid burns, do not let
bare skin touch hot surfaces.
- These instructions are written to help you
!
5. Do not insert or allow foreign objects to enter any ventilation
or exhaust opening as this may cause an electric shock,
fire,or damage to the heater.
6. To prevent a possible fire, do not block air intakes or
exhaust in any manner. Keep combustible materials, such
as crates, drapes, etc., away from heater. Do not install
behind door, furniture, towels, or boxes.
7. A heater has hot and arcing or sparking parts inside. Do not
use it in areas where gasoline, paint or flammable liquids
are stored.
8. 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.
9. This heater is not approved for use in corrosive atmospheres such as marine, green house or chemical storage
areas.
SAVE THESE INSTRUCTIONS
THE HEATER MUST BE MOUNTED AT LEAST 7' (2134MM)
A
B
C
D
ABOVE THE FLOOR TO PREVENT ACCIDENTAL CONTACT
WITH THE FAN BLADE WHICH COULD CAUSE INJURY.
THE CEILING MOUNTING STRUCTURE AND THE ANCHORING PROVISIONS MUST BE OF SUFFICIENT STRENGTH
TO SUPPORT THE COMBINED WEIGHT OF THE HEATER
AND MOUNTING BRACKET. (SEE TABLE 4).
ALL BUILT-IN THERMOSTATS: IF THE HEATER IS USED TO
PREVENT PIPING OR LIQUIDS FROM FREEZING, AND IF
THE THERMOSTAT IS SET BELOW 45° F (7°C), THE FAN
MUST RUN CONTINUOUSLY.
TO PREVENT POSSIBLE OVERHEATING OR DAMAGE DUE
TO OVERHEATING, KEEP AT LEAST 5' (1524MM) CLEARANCE IN FRONT OF HEATER. REFER TO TABLE 1 FOR
SIDE, TOP, AND BACK CLEARANCE REQUIREMENTS.
DO NOT MOUNT MERCURY TYPE THERMOSTAT DIRECTLY
ON UNIT. VIBRATION COULD CAUSE HEATER TO
MALFUNCTION.
MANUAL RESET LIMIT
(FACTORY INSTALLED OPTION
ONLY.) THE LIMIT SWITCH IS LOCATED INTERNALLY ON
THE REAR OF THE HEATER. ON THE 3KW AND 5KW
MODELS, THE ACCESS TO THE RESET BUTTON IS ON THE
RIGHT SIDE (WHEN FACING REAR OF HEATER); ON ALL
OTHER MODELS IT IS NEAR THE TOP REAR OF THE
HEATER.
THE MANUAL RESET LIMIT IS IN SERIES WITH THE AUTOMATIC RECYCLING PROTECTOR (LIMIT). THE MANUAL
RESET LIMIT WILL NOT RESET UNTIL THE HEATER HAS
COOLED AND THE BUTTON IS PUSHED IN.
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
building exposed to a prevailing wind.
Locate thermostats approximately 5' (1524mm) above the floor
on interior partition walls or post away from cold drafts, internal
heat sources and away from heater discharge air streams.
Small rooms can be heated by one unit heater.
Large rooms require multi-unit installations. Number and capaci-
ty 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.
MOUNTING THE HEATER - GENERAL
The heater may be mounted to discharge the heated air either
horizontally or vertically. When the heater is mounted for vertical
discharge, it is recommended that the heater be positioned so
that the access door will open away from the wall to provide
greater access to the wiring and control compartment. If the
heater is to be mounted with the access door facing a wall, the
heater must be mounted far enough from that wall to allow full
opening of the access door (a distance approximately equal to
the width of the heater ... check clearance before installing).
Refer to Table 1 for wall and ceiling clearances before mounting
heater.
The heater may be mounted for either vertical or horizontal discharge by the use of threaded rods. (Refer to Table 2 for threaded rod sizes required.) Observe the detailed procedures in the
following installation instructions.
The heater may also be suspended from the wall or ceiling by
means of an optional mounting bracket (type MMB or MCMB)
which permits horizontal pivoting of the heater.
After the heater is installed, the louvers may be positioned to
direct the heated air in the desired direction. When the heater is
installed for horizontal discharge, the louvers should direct the
air either straight ahead or downward. Directing the air upward
may cause the heated air to remain in the ceiling area and
waste energy.
Table 1. Wall and Ceiling Clearance, inches (mm)
Unit Discharge Ceiling Side Wall Back Wall
3 & 5 kW
7.5 to 10 kW
15 to 10 kW
25 to 50 kW
MOUNTING
ROD
LOCK NUT
B
A
C
K
W
A
L
L
Figure 1. Horizontal Discharge Mounting and Spacing.
Table 2. Rod Thread and Spacing Dimensions, inches (mm)
for Horizontal Discharge
Unit Type A B C D
3 - 5 kW
7.5 - 10 kW
15 - 20 kW
25 - 30 kW
40 - 50 kW
2
Horiz. 2 (50.8) 6 (152.4) 9 (228.6)
Vert. 6 (152.4) 18 (457.2) 18 (457.2)
Horiz. 6 (152.4) 6 (152.4) 13 (330.2)
Vert. 6 (152.4) 24 (609.6) 24 (609.6)
Horiz. 6 (152.4) 9 (228.6) 12
Vert 6 (152.4) 24 (609.6) 24 (609.6)
Horiz. 16 (406.4) 12 (304.8) 18
Vert. 12 (304.8) 39 (914.4) 39 (914.4)
CEILING
UNIT HEATER
THREADED
MOUNTING
OLES
H
A
BACK WALL
B
(TOP VIEW)
1
/2(317.5)
1
/2(470.0)
D
C
Rod Thread
3
3
8
5
5
5
/16- 18
3
/8- 16
51/
1
/
16
16
16
64
61/
(153.9)
11
(289.0)
10
(268.2) (368.3) (157.2) (16.0)
1515/1614 - 12 63/
(404.9) (368.3) (157.2) (16.0)
(152.4) (103.1) (19.0)
16
87/
3
/
8
9
/
16
8
(225.6) (130.3) (19.0)
14 - 12 63/
/
4
/
4
/
8
/
8
S
I
D
E
W
A
L
L
Horizontal Discharge (Rod-mount from Ceiling)
1. Install four threaded mounting rods in the threaded holes and
secure in place using lock nuts. (See Table 2).
2. Securely attach the four mounting rods to the ceiling. (Refer
to Table 1 for wall and ceiling clearances, and Table 2 for
mounting rod spacing).
Table 3. Rod Thread and Spacing Dimensions, inches (mm)
for Vertical Discharge
Rod Thread
Unit Type E F G H
3 - 5 kW
7.5 - 20 kW
25 - 30 kW
ACCESS
DOOR
B
A
C
K
W
A
L
L
CLEARANCE EQUAL TO W IDTH
OF HEAT ER TO PERMIT FULL
OPENING OF THE ACCESS DOOR
CEILING
LOCK NUT
5
/16- 18
3
/8- 16
THREADED
MOUNTING
HOLES
3
/
4
145/
8
211/
4
G
(TOP VIEW)
24
25
23/
E
69
152.4) 247.7) (50.8) (103.1)
(
7
8
/
8
225.6) (371.6) (50.8) (130.3)
(
1
14
/
2
368.3) (539.8) (56.0) (157.2)
(
MOUNTING
ROD (4)
16
BACK WALL
1
/
6
1
1
/
8
63/
16
S
I
D
E
W
F
A
L
L
H
Figure 2. Vertical Discharge Mounting and Rod Spacing
Vertical Discharge (Rod-Mount from Ceiling)
1. Remove bolts from the threaded holes in the back of the
heater.
2. Install four threaded mounting rods in the threaded holes and
and secure in place using lock nuts.
3. Securely attach the four mounting rods to the ceiling. (Refer
to Table 1 for wall and ceiling clearances, and Table 3 for
mounting rod spacing dimensions.)
WIRING
Branch Circuit (Power)
1. Connect heater only to the voltage, amperage and frequency
specified on the nameplate.
2. Field wiring must be properly sized to carry the amperage in
accordance with the NEC.
3. The access door is hinged. There are either one or two
screws accessible from the side that must be loosened to
gain access. These screws are the captive type; do not try
to remove them.
4. A knockout is provided in the back of the heater close to the
power terminal block and the control terminal board. The
control terminal board knockout is 1/2 inch (12.7 mm) conduit
size. The power terminal block knockout is multiple diameter. Use the diameter that fits the required conduit size.
5. A ground terminal is provided near the power terminal board.
The ground wire should be connected before other connections are made.
6. The power terminal block is equipped with box terminals sized
to accept the correct size power supply wire. Branch circuit
wire rated min 600V, 60° C is acceptable for heaters rated up
to 80 amps. For heaters rated more than 80 amps, branch
circuit wire must be rated at least 75°C. Either aluminum or
copper wire is satisfactory for connection to the heater power
terminal block box terminal. Copper wire is recommended
and must be used with built-in disconnect switch.
7. Each heater has a wiring diagram affixed to the inside of the
access door. Consult this diagram before making any field
connections.
Important Note - Installation Screw Lug Torque:
During transportation it is possible screw lug connections can
loosen. After installation, before power is turned on to the
heater, check all screw lug connections for tightness to a recommended minimum torque of 35 in-lbs. (3.9 N-m).
8. Single or three-phase power connections may be used with
heater models MUH0521, MUH0581, MUH072, MUH078,
MUH102, MUH108, and MUH158. These units are factory
wired for single-phase operation. If these heaters are for
use with three-phased power, reconnect the wires as indicated in the wiring diagram attached to the heater.
Additional information can be found by looking at the wiring
illustrations in Figures 3a and 3b and following the directions
shown below.
On models MUH0521,MUH0581, MUH072, MUH078, MUH102,
and MUH108 (Figure 3a), move only the two wires marked “A1”
and marked “B1”; do not move or change any other wiring. The
element lead wire marked “B1” which is factory connected to the
power terminal block (terminal located closest to the elements)
must be moved to terminal “B” on the three-phase terminal
block.
The relay (contactor) lead wire “A1” must be moved from the
end terminal of the power terminal block (terminal closest to the
contactor or control terminal board) to the “A” terminal of the
lower terminal block (center terminal).
Model MUH158 (Figure 3b) has two three-phase terminal blocks
located adjacent to the relays (contactors). Move only the two
wires marked “C1” and “D1” on each of these two three-phase
terminal blocks to terminal “B”. Do not move or change any
other wires.
9. Electrical Accessories, either kits or factory-installed
options, are shown connected by a dash line on the heater
wiring diagram.
208/240 VOLT HEATER:
10.
The heaters are wired for 240V
from factory. When heater is to be connected to 208V supply, the transformer leads have to be interchanged. For units
rated 30/40kW or higher, interchange ORANGE and RED
primary leads. The black colored lead is the COMMON for
the transformer (50VA) provided with the high wattage units.
For lower kW rated heaters, interchange BLACK and RED
primary leads. The WHITE colored lead is the COMMON for
the control transformer provided with these heaters. Always
refer to the wiring diagram on the cover of the heater before
making this reconnection of tranformer primary leads.
Control Wiring
LINE VOLTAGE IS PRESENT ON SOME OF THE TERMINALS ON THE CONTROL TERMINAL BOARD. ALWAYS
DISCONNECT THE POWER FROM THE HEATER BEFORE
MAKING ANY CONNECTIONS TO THE CONTROL BOARD
TO PREVENT ELECTRIC SHOCK HAZARD.
1. Use min. 600 volts, NEC Class 1 insulated wire for all control
circuit wiring.
2. Use a crimp-on type fork terminal on the wire ends that attach
to the control terminal board if more than one connection is to
be made under the terminal screw.
3. On units not provided with internal contactor (3 & 5 KW), refer
to Figure 4 for wiring diagram.
Note:
Thermostat and control circuit wiring must be suitable to
handle the full load of the heater (example MUH0581 is rated 24
amps)
4. On units provided with internal contactor
higher) refer to Figure 5 for wiring diagram. Control wiring
must be rated minimum 18 AWG.
3
(units rated 7 KW and
A
B
LEAD WIRE
"B1"
ELEMENTS
CONTACTOR
(OR P2)
POWER TERMINAL BLOCK
HEATER FRONT
LEAD WIRE
"A1"
3 PHASE BLOCK
TO ELEMENTS
A
B
L
EAD WIRE
"B1"
ELEMENTS
CONTACTOR
(OR P2)
POWER TERMINAL BLOCK
HEATER FRONT
LEAD WIRE
"A1"
3 PHASE BLOCK
TO ELEMENTS
FACTORY-WIRED FOR SINGLE-PHASE POWER FIELD-WIRED FOR THREE-PHASE POWER
Figure 3a. Wiring Connections for Single-Phase and Three -Phase Power(MUH0521, MUH0581, MUH072, MUH078, MUH102 and MUH108)
B
3 PHASE BLOCK
FACTORY-WIRED FOR SINGLE-PHASE POWER
C
1
D
1
D
1
C
1
C
D
B
C
D
3 PHASE BLOCK
B
3 PHASE BLOCK
FIELD-WIRED FOR THREE-PHASE POWER
C
1
D
1
D
1
C
1
C
D
B
C
D
3 PHASE BLOCK
BLACK
RED
RED
BLACK
C
RW1
W2
F 2
F 1
G
T R
T
S
S
REMOTE SUMMER FAN
SWITCH (MRFS-1)
FAN RELAY
(FOR MRFS-2 AMD MHRT)
SUMMER
FAN
SWITCH
MT-1
MT-2
2-STAGE
INTERNAL
THERMOSTAT
BLACK
RED
RED
BLACK
P2
H2
F 1
F 2
S
REMOTE SUMMER
FAN SWITCH (MRFS-1)
OR SUMMER FAN
SWITCH MCFS (MANUAL)
P1
H1
T
T
MT-1
MT-2
BLACK TO W1
RED TO R
2-STAGE
INTERNAL
THERMOSTAT
MHRT HEAT RECOVERY
THERMOSTAT OR
REMOTE FAN
SWITCH (MRFS-2)
BLACK
RED
RED
BLACK
C
RW1
W2
F 2
F 1
G
T R
T
S
S
REMOTE SUMMER FAN
SWITCH (MRFS-1)
FAN RELAY
(FOR MRFS-2 AMD MHRT)
SUMMER
FAN
SWITCH
Figure 3b. Wiring Connections for Single-Phase and Three -Phase Power (MUH158)
NOTES:
1. THIS STYLE CONTROL TERMINAL BOARD USED WITH MODELS
MUH0321, MUH0371, MUH0381, MUH0521, MUH0571, AND
MUH0581.
2. WHEN UNIT IS WIRED FOR SINGLE-PHASE, JUMPER H1 TO H2.
IF SINGLE-POLE THERMOSTAT IS USED WITH SINGLE-PHASE
UNIT, CONNECT THERMOSTAT LEADS TO P1 AND H1.
3. EXTERNAL LINE VOLTAGE THERMOSTATS SHOULD BE
TREATED AS SINGLE STAGE ONLY.
Figure 4. Control Terminal Board (for Heaters Without Contactors)
Figure 5. Control Terminal Board (for Heaters With Contactors)
4
NOTES:
1. THIS STYLE CONTROL TERMINAL BOARD USED
WITH MODELS EXCEPT MUH0321, MUH0371,
MUH0381, MUH0521, MUH0571, AND MUH0581.
2. REMOVE JUMPER W1 TO W2 WHEN 2-STAGE THERMOSTAT IS USED.
3. *ONLY ONE OF THESE ACCESSORIES MAY BE
4. EXTERNAL LINE VOLTAGE THERMOSTATS
INSTALLED IN A SINGLE HEATER.
SHOULD BE TREATED AS SINGLE STAGE ONLY.
Table 4. Specifications
Basic Model Height Width Depth Weight Compartment
No. in (mm) in. (mm) in. (mm) lbs. (kg) Volume
MUH0381 27 (12.2)
UH0321 27 (12.2)
M
UH0371 27 (12.2)
M
MUH0341 30 (13.6)
MUH0581 27 (12.2)
UH0521
M
MUH0571
6 14 7
1
406.4) (355.6) (190.5)
(
MUH0541 30 (13.6)
UH0331 30 (13.6)
M
MUH0361 30 (13.6)
MUH0531 30 (13.6)
MUH0561 30 (13.6)
UH078 38 (17.2)
M
MUH072 38 (17.2)
MUH077 38 (17.2)
UH074 38 (17.2)
M
MUH108
MUH102
3
21
/
19 71/
4
(552.5) (482.6) (190.5)
MUH107 38 (17.2)
MUH104 38 (17.2)
MUH073 38 (17.2)
UH076 38 (17.2)
M
MUH103 38 (17.2)
MUH106 38 (17.2)
MUH158 54 (24.5)
MUH152 50 (22.7)
MUH154 50 (22.7)
MUH208
MUH202
3
21
/
19 123/
4
(552.5) (482.6) (323.9)
MUH204 55 (24.9)
MUH156 55 (24.9)
MUH206 55 (24.9)
MUH252 89 (40.4)
MUH254 89 (40.4)
MUH308
MUH302
MUH304 89 (40.4)
30 26
(76.2) 676.4) (298.5)
5
/
113/
8
MUH256 89 (40.4)
MUH306 89 (40.4)
MUH402 119 (54.0)
MUH404 119 (54.0)
MUH508
MUH502
MUH504 119 (54.0)
30 26
(76.2) 676.4) (435.1)
5
/
171/
8
MUH406 119 (54.0)
MUH506 119 (54.0)
Mounting Wiring
1
/
7 (12.2)
2
2
27 (12.2)
38 (17.2) 100 in
2
38 (17.2)
60 (27.2)
4
55 (24.9)
89 (40.4)
4
89 (40.4)
119 (54.0)
4
119 (54.0)
0 in
9
14.70 cm
(
(1639 cm
140 in
(2295 cm
504 in
(8260 cm
648 in
(10620 cm
3
3
)
3
3
)
MODEL NO.
MFG. NO.
NAMEPLATE
MUH0321
DATE CODE
0395
VOLTS AC KILOWATTS PHASE MIN. SUPPLY
60 HZ CIR. AMPACITY
208 / 240 2.2 /3 1
MAX. FUSE MOTOR CONTROLS CUSTOMER NO
VAC AMP VAC
208/240 .25 208/240
3
3
)
AIR MINIMUM MOUNTING CLEARANCE
FLOW SIDE BACK CEILING FLOOR
HORIZ. 6" 9.5" 2" 7'
VERT. 18" 18" 6" 7'
WARNING:
DISCONNECT POWER BEFORE SERVICING. IF EXTERNAL CONTROL IS
USED, ALSO DISCONNECT EXTERNAL POWER SUPPLY.
NE PAS RELEVER LES LAMES AU-DEL
3
3
)
L'APPAREIL. METTRE HORS TENSION AVANT DE PROCEDER A
L'ENTRETIEN. SI UNE COMMANDE EXTERNE EST UTILISEE, COUPER
AUSSE L'ALIMENTATION EXTERNE. ASSURER UN DEGAGEMENT D'AU
MOINS 6 PI ENTRE L'APPAREIL DE CHAUFFAGE ET LEPLANCHER.
MARLEY ENGINEERED PRODUCTS
BENNETTSVILLE, SC 29512 4104-0275-036
3
3
)
DO NOT TURN LOUVERS ABOVE LEVEL OF THE UNIT.
`
A DU NIVEAU PREVU DE
774G LISTED
AIR HEATER
IMPORTANT INFORMATION
5
All products manufactured by Marley Engineered Products are warranted against defects in workmanship and materials for one year from date of installation, except
LIMITED WARRANTY
heating elements which are warranted against defects in workmanship and materials for five years from date of installation. This warranty does not apply to damage from
accident, misuse, or alteration; nor where the connected voltage is more than 5% above the nameplate voltage; nor to equipment improperly installed or wired or
maintained in violation of the product’s installation instructions. All claims for warranty work must be accompanied by proof of the date of installation.
The customer shall be responsible for all costs incurred in the removal or reinstallation of products, including labor costs, and shipping costs incurred to return products
to Marley Engineered Products Service Center. Within the limitations of this warranty, inoperative units should be returned to the nearest Marley authorized service center or the Marley Engineered Products Service Center, and we will repair or replace, at our option, at no charge to you with return freight paid by Marley. It is agreed that
such repair or replacement is the exclusive remedy available from Marley Engineered Products.
THE ABOVE WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED, AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE WHICH EXCEED THE AFORESAID EXPRESSED WARRANTIES ARE HEREBY DISCLAIMED AND EXCLUDED FROM
THIS AGREEMENT. MARLEY ENGINEERED PRODUCTS SHALL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES ARISING WITH RESPECT TO THE
PRODUCT, WHETHER BASED UPON NEGLIGENCE, TORT, STRICT LIABILITY, OR CONTRACT.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above exclusion or limitation may not apply to you. This warranty gives
you specific legal rights, and you may also have other rights which vary from state to state.
For the address of your nearest authorized service center, contact Marley Engineered Products in Bennettsville, SC, at 1-800-642-4328. Merchandise returned to the factory must be accompanied by a return authorization and service identification tag, both available from Marley Engineered Products. When requesting return authorization,
include all catalog numbers shown on the products.
HOW TO OBTAIN WARRANTY SERVICE AND
WARRANTY PARTS PLUS GENERAL INFORMATION
1. Warranty Service or Parts
2. Purchase Replacement Parts
3. General Product Information
Note:
When obtaining service always have the following:
1. Model number of the product
2. Date of manufacture
3. Part number or description
1-800-642-4328
1-800-654-3545
www.marleymep.com
470 Beauty Spot Rd. East
Bennettsville, SC 29512 USA
Part No. 5200-0722-013
ECR 38995
03/11
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