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 - These instructions are written to help you	5.	Do not insert or allow foreign objects to enter any ventilation
	prevent difficulties that might arise during installation of heaters.		or exhaust opening as this may cause an electric shock,
			fire,or damage to the heater.
	Studying the instructions first may save you considerable time	6.	To prevent a possible fire, do not block air intakes or
	and money later. Observe the following procedures, and cut		exhaust in any manner. Keep combustible materials, such
	your mounting time to a minimum.		as crates,	drapes, etc., away from heater. Do not install
			behind door, furniture, towels, or boxes.
	To reduce risk of fire or electric shock:
		7.	A heater has hot and arcing or sparking parts inside. Do not
	1. To prevent electrical shock, disconnect all power coming to
			use it in areas where gasoline, paint or flammable liquids
	heater at main service panel before wiring or servicing.		are stored.
	2. All wiring must be in accordance with the National and	8.	Use this heater only as described in this manual. Any other
	Local Electrical Codes and the heater must be grounded as		use not recommended by the manufacturer may cause fire,
	a pre-caution against possible electric shock.		electric shock, or injury to persons.
	3. Verify the power supply voltage coming to heater matches	9.	This heater is not approved for use in corrosive atmos-
	the ratings printed on the heater name plate before energiz-		pheres such as marine, green house or chemical storage
	ing.		areas.

4. This heater is hot when in use. To avoid burns, do not let bare skin touch hot surfaces.

SAVE THESE INSTRUCTIONS

THE HEATER MUST BE MOUNTED AT LEAST 7' (2134MM) 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 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.

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
	Horiz.	2 (50.8)	6 (152.4)	9 (228.6)
3 & 5 kW	Vert.	6 (152.4)	18 (457.2)	18 (457.2)
	Horiz.	6 (152.4)	6 (152.4)	13 (330.2)
7.5 to 10 kW	Vert.	6 (152.4)	24 (609.6)	24 (609.6)
	Horiz.	6 (152.4)	9 (228.6)	121/2 (317.5)
15 to 10 kW	Vert	6 (152.4)	24 (609.6)	24 (609.6)
	Horiz.	16 (406.4)	12 (304.8)	181/2 (470.0)
25 to 50 kW	Vert.	12 (304.8)	39 (914.4)	39 (914.4)
	CEILING		BACK WALL
MOUNTING		THREADED
		MOUNTING
ROD			BB	D
		HOLES
				S
				I
LOCK NUT				D
B				E
A				W
C		AA		A
K				L
W				L
A
L
L
				CC
		UNIT HEATER	(TOP VIEW)

Figure 1. Horizontal Discharge Mounting and Spacing.

Table 2. Rod Thread and Spacing Dimensions, inches (mm) for Horizontal Discharge

		Rod Thread
	Unit	Type		A		B	C	D
3	- 5 kW					6	41/16	3/4
				61/16		(152.4)	(103.1)	(19.0)
7.5 - 10 kW		5/16 - 18		(153.9)		87/8	51/8	3/4
15	- 20 kW			113/8		(225.6)	(130.3)	(19.0)
				(289.0)
25	- 30 kW			109/16		14 - 12	63/16	5/8
				(268.2)		(368.3)	(157.2)	(16.0)
		3/8 - 16
40	- 50 kW			1515/16		14 - 12	63/16	5/8
				(404.9)		(368.3)	(157.2)	(16.0)

2

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		6	93/4	2	41/16
			(152.4)	247.7)	(50.8)	(103.1)
		5/16 - 18
	7.5 - 20 kW		87/8	145/8	2	51/8
			(225.6)	(371.6)	(50.8)	(130.3)
	25 - 30 kW	3/8 - 16	141/2	211/4	23/16	63/16
			(368.3)	(539.8)	(56.0)	(157.2)

	CEILING
ACCESS	LOCK NUT
DOOR

B

A

C

K

W

A

L

L

CLEARANCE EQUAL TO WIDTH

OF HEATER TO PERMIT FULL

OPENING OF THE ACCESS DOOR

MOUNTING ROD (4)

		BACK WALL
		E
	G		S
			I
			D
	THREADED		E
	MOUNTING		W
	HOLES	F
			A
			L
			L

(TOP VIEW)
			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.

10.208/240 VOLT HEATER: 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 (units rated 7 KW and higher) refer to Figure 5 for wiring diagram. Control wiring must be rated minimum 18 AWG.

3

HEATER FRONT					LEAD WIRE			3 PHASE BLOCK
					"A1"

TO ELEMENTS	B
	A
		ELEMENTS
CONTACTOR		LEAD WIRE
	POWER TERMINAL BLOCK	"B1"
(OR P2)

HEATER FRONT	LEAD WIRE	3 PHASE BLOCK
	"A1"

		LEAD WIRE
		"B1"
	TO ELEMENTS	B
		A
		ELEMENTS

	CONTACTOR	POWER TERMINAL BLOCK
	(OR P2)

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	C	D	D	C
			1
				1
		3 PHASE BLOCK
			D	C
				1
B	C	D	1

3 PHASE BLOCK

B	C	D	D	C
			1
				1
		3 PHASE BLOCK
			D	C
				1
B	C	D	1

3 PHASE BLOCK

FACTORY-WIRED FOR SINGLE-PHASE POWER

FIELD-WIRED FOR THREE-PHASE POWER

Figure 3b. Wiring Connections for Single-Phase and Three -Phase Power (MUH158)

2-STAGE

INTERNAL THERMOSTAT

REMOTE SUMMER RED FAN SWITCH (MRFS-1)

OR SUMMER FAN SWITCH MCFS (MANUAL)

MT-2
BLACK
H1	H2	F2	S
RED
BLACK
P1	P2	F1

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.

MT-1

Figure 4. Control Terminal Board (for Heaters Without Contactors)

					S	REMOTE SUMMER FAN
		RED				SWITCH (MRFS-1)
	BLACK TO W1	BLACK				FAN RELAY
						(FOR MRFS-2 AMD MHRT)
T	T
MT-1	MT-2
	2-STAGE				TR
	INTERNAL					S
	THERMOSTAT
		BLACK	G			SUMMER
		RED		W2	F1
						FAN
	RED TO R					SWITCH
	MHRT HEAT RECOVERY	C	R	W1	F2
	THERMOSTAT OR
	REMOTE FAN	T
	SWITCH (MRFS-2)

Figure 5. Control Terminal Board (for Heaters With Contactors)

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 INSTALLED IN A SINGLE HEATER.

4.EXTERNAL LINE VOLTAGE THERMOSTATS SHOULD BE TREATED AS SINGLE STAGE ONLY.

4

Table 4. Specifications

				Mounting		Wiring
Basic Model	Height	Width	Depth	Weight		Compartment
No.	in (mm)	in. (mm)	in. (mm)	lbs. (kg)		Volume
MUH0381				27 (12.2)
MUH0321				27 (12.2)
MUH0371				27 (12.2)
MUH0341				30 (13.6)
MUH0581				27 (12.2)
MUH0521	16	14	71/2	27 (12.2)		90 in3
	(406.4)	(355.6)	(190.5)			(14.70 cm3)
MUH0571				27 (12.2)
MUH0541				30 (13.6)
MUH0331				30 (13.6)
MUH0361				30 (13.6)
MUH0531				30 (13.6)
MUH0561				30 (13.6)
MUH078				38 (17.2)
MUH072				38 (17.2)
MUH077				38 (17.2)
MUH074				38 (17.2)
						100 in3
MUH108	213/4	19	71/2	38 (17.2)
	(552.5)	(482.6)	(190.5)			(1639 cm3)
MUH102				38 (17.2)
MUH107				38 (17.2)
MUH104				38 (17.2)
MUH073				38 (17.2)
MUH076				38 (17.2)
MUH103				38 (17.2)
MUH106				38 (17.2)
MUH158				54 (24.5)
MUH152				50 (22.7)
MUH154				50 (22.7)
MUH208	213/4	19	123/4	60 (27.2)		140 in3
	(552.5)	(482.6)	(323.9)			(2295 cm3)
MUH202				55 (24.9)
MUH204				55 (24.9)
MUH156				55 (24.9)
MUH206				55 (24.9)
MUH252				89 (40.4)
MUH254				89 (40.4)
MUH308				89 (40.4)
	30	265/8	113/4			504 in3
MUH302				89 (40.4)
	(76.2)	676.4)	(298.5)			(8260 cm3)
MUH304				89 (40.4)
MUH256				89 (40.4)
MUH306				89 (40.4)
MUH402				119 (54.0)
MUH404				119 (54.0)
MUH508				119 (54.0)
	30	265/8	171/4			648 in3
MUH502				119 (54.0)
	(76.2)	676.4)	(435.1)			(10620 cm3)
MUH504				119 (54.0)
MUH406				119 (54.0)
MUH506				119 (54.0)

IMPORTANT INFORMATION

NAMEPLATE

MODEL NO.		MUH0321					DATE CODE 0395
MFG. NO.
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
AIR		MINIMUM MOUNTING CLEARANCE
FLOW	SIDE		BACK		CEILING		FLOOR
HORIZ.		6"	9.5"		2"		7'
VERT.		18"	18"		6"		7'

WARNING: DO NOT TURN LOUVERS ABOVE LEVEL OF THE UNIT. DISCONNECT POWER BEFORE SERVICING. IF EXTERNAL CONTROL IS USED, ALSO DISCONNECT EXTERNAL POWER SUPPLY.

NE PAS RELEVER LES LAMES AU-DEL`A DU NIVEAU PREVU DE 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.

774G LISTED AIR HEATER

MARLEY ENGINEERED PRODUCTS
BENNETTSVILLE, SC 29512	4104-0275-036

5

LIMITED WARRANTY

All products manufactured by Marley Engineered Products are warranted against defects in workmanship and materials for one year from date of installation, except 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	1-800-642-4328
2.	Purchase Replacement Parts	1-800-654-3545
3.	General Product Information	www.marleymep.com

Note: When obtaining service always have the following:

1.Model number of the product

2.Date of manufacture

3.Part number or description

470 Beauty Spot Rd. East

Bennettsville, SC 29512 USA

Part No. 5200-0722-013

ECR 38995

03/11