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Installation, Operation & Maintenance Instructions

MUH SeriesModular Unit HeatersInstallation, Operation & Maintenance InstructionsECR 4055907/155200-11106-001 SpecificationsMountingWiringBasic Model Height Width DepthWeight (mm) in. (mm) in. (mm) lbs. (kg)VolumeMUH038127 ( )MUH032127 ( )MUH037127 ( )MUH034130 ( )MUH058127 ( )MUH0521161471/227 ( )90 in3 MUH0571( ) ( ) ( )27 ( )( cm3)MUH054130 ( )MUH033130 ( )MUH036130 ( )MUH053130 ( )MUH056130 ( )MUH07838 ( )MUH07238 ( )MUH07738 ( )MUH07438 ( )MUH108213/41971/238 ( )100 in3 MUH102( ) ( ) ( )38 ( )(1639 cm3)MUH10738 ( )MUH10438 ( )MUH07338 ( )MUH07638 ( )MUH10338 ( )MUH10638 ( )MountingWiringBasic Model Height Width DepthWeight (mm) in. (mm) in. (mm) lbs. (kg)VolumeMUH15854 ( )MUH15250 ( )MUH15450 ( )MUH208213/419123/460 ( )140 in3 MUH202( ) ( ) ( )55 ( )(2295 cm3)MUH20455 ( )MUH15655 ( )MUH20655 ( )MUH25289 ( )MUH25489 ( )MUH30830265/8113/489 ( )504 in3 MUH302( ) ) ( )89 ( )(8260 cm3)MUH30489 ( )MUH25689 ( )MUH30689 ( )MUH402119 ( )MUH404119 ( )MUH50830265/8171/4119 ( )648 in3 MUH502( ) ) ( )119 ( )(10620 cm3)MUH504119 ( )MUH406119 ( )MUH506119 ( )Heater location InstructionsArrange units so that discharge air streams:a.

MUH Series Modular Unit Heaters Installation, Operation & Maintenance Instructions ECR 40559 07/15 5200-11106-001 Specifications Mounting Wiring Basic Model Height Width Depth Weight Compartment

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1 MUH SeriesModular Unit HeatersInstallation, Operation & Maintenance InstructionsECR 4055907/155200-11106-001 SpecificationsMountingWiringBasic Model Height Width DepthWeight (mm) in. (mm) in. (mm) lbs. (kg)VolumeMUH038127 ( )MUH032127 ( )MUH037127 ( )MUH034130 ( )MUH058127 ( )MUH0521161471/227 ( )90 in3 MUH0571( ) ( ) ( )27 ( )( cm3)MUH054130 ( )MUH033130 ( )MUH036130 ( )MUH053130 ( )MUH056130 ( )MUH07838 ( )MUH07238 ( )MUH07738 ( )MUH07438 ( )MUH108213/41971/238 ( )100 in3 MUH102( ) ( ) ( )38 ( )(1639 cm3)MUH10738 ( )MUH10438 ( )MUH07338 ( )MUH07638 ( )MUH10338 ( )MUH10638 ( )MountingWiringBasic Model Height Width DepthWeight (mm) in. (mm) in. (mm) lbs. (kg)VolumeMUH15854 ( )MUH15250 ( )MUH15450 ( )MUH208213/419123/460 ( )140 in3 MUH202( ) ( ) ( )55 ( )(2295 cm3)MUH20455 ( )MUH15655 ( )MUH20655 ( )MUH25289 ( )MUH25489 ( )MUH30830265/8113/489 ( )504 in3 MUH302( ) ) ( )89 ( )(8260 cm3)MUH30489 ( )MUH25689 ( )MUH30689 ( )MUH402119 ( )MUH404119 ( )MUH50830265/8171/4119 ( )648 in3 MUH502( ) ) ( )119 ( )(10620 cm3)MUH504119 ( )MUH406119 ( )MUH506119 ( )Heater location InstructionsArrange units so that discharge air streams:a.

2 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 abuilding exposed to a prevailing thermostats approximately 5' (1524mm) above the flooron interior partition walls or post away from cold drafts, internalheat sources and away from heater discharge air rooms can be heated by one unit rooms require multi-unit installations. Number and capaci-ty of units will be determined by volume of building and squarefeet of floor area to be heated. Arrange units to provide perimeterair circulation where each unit supports the air stream UsiNg ELECTRiC AppLiANCEs, BAsiC pRECAU-TioNs sHoULD ALwAys BE foLLowED To REDUCE THERisK of fiRE, ELECTRiC sHoCK, AND iNJURy To pER-soNs, iNCLUDiNg THE foLLowiNg:1. Read all Instructions before installing or using this This heater is a commercial/industrial product not intendedfor use in a residential This heater is hot when in use.

3 To avoid burns, do not letbare skin touch hot surfaces. Keep combustible materials,such as furniture, pillows, bedding, papers, clothes, etc. andcurtains at least 3 feet ( m) from the front of the Extreme caution is necessary when any heater is used by ornear children or invalids and whenever the heater is leftoperating and This heater has hot and arcing or sparking parts inside andis not intended for use in hazardous atmospheres whereflammable vapors, gases, liquids or other combustibleatmospheres as defined in the National Electrical Code areused or stored. failure to comply can result in explosion Do not operate any heater after it malfunctions. Disconnectpower at service panel and have heater inspected by a rep-utable electrician before Do not use To disconnect heater, turn controls to off, and turn off powerto heater circuit at main disconnect Do not insert or allow foreign objects to enter any ventilationor exhaust opening as this may cause an electric shock, fire,or damage to the To prevent a possible fire, do not block air intake or exhaustin any Use this heater only as described in this manual.

4 Any otheruse not recommended by the manufacturer may cause fire, 12. This heater is not intended for use in special not use in damp or wet locations such as marine orgreenhouse or in areas where corrosive or chemical agentsare when installing, see iNsTALLATioN Instructions foradditional warnings and for safe and efficient Operation , and to extend the life of yourheater, keep your heater clean - see tHESE Instructions !WarNINGTo prevent a possible fire, injury to persons or damage to theheater, adhere to the following:1. Disconnect all power coming to heater at main service panelbefore wiring or Note: This heater must be installed by a qualifiedperson. 2. All wiring procedures and connections must be in accor-dance with the National and Local Codes having jurisdictionand the heater must be Verify the power supply voltage coming to heater matchesthe ratings as shown on the heater : ENER giziNg HEATER AT A VoLTAgE gREATERTHAN THE VoLTAgE pRiNTED oN THE NAMEpLATE wiLLDAMAgE THE HEATER AND VoiD THE wARRANTy ANDCoULD CAUsE A To reduce the risk of fire, do not store or use gasoline orother flammable vapors and liquids in the vicinity of The ceiling or wall mounting structure and the anchoringprovisions must be of sufficient strength to support the com-bined weight of the heater and mounting bracket.

5 6. All built-in thermostats: if the heater is used to prevent pip-ing or liquids from freezing, and if the thermostat is setbelow 45 f (7 C), the fan must run The heater must be mounted at least 7 (2134 mm) abovethe floor to avoid accidental contact with the fan blade whichcould cause Keep at least 5 clearance in front of the heater. Refer toTable 1 for side, top and back clearance Do not mount mercury type thermostat directly on could cause heater to malfunction.!WarNINGIMPOrtaNt INStrUCtIONSINS tallatION INStrUCtIONSM ounting the Heater - GeneralThe heater may be mounted to discharge the heated air eitherhorizontally or vertically. when the heater is mounted for verticaldischarge, it is recommended that the heater be positioned sothat the access door will open away from the wall to providegreater access to the wiring and control compartment. if theheater is to be mounted with the access door facing a wall, theheater must be mounted far enough from that wall to allow fullopening of the access door (a distance approximately equal tothe width of the heater, check clearance before installing).

6 Referto Table 1 for wall and ceiling clearances before mounting heater. The heater may be mounted for either vertical or horizontal dis-charge by the use of threaded rods. (Refer to Table 2 for thread-ed rod sizes required.) observe the detailed procedures in thefollowing installation heater may also be suspended from the wall or ceiling bymeans of an optional mounting bracket (type MMB or MCMB)which permits horizontal pivoting of the the heater is installed, the louvers may be positioned todirect the heated air in the desired direction. when the heater isinstalled for horizontal discharge, the louvers should direct theair either straight ahead or downward. Directing the air upwardmay cause the heated air to remain in the ceiling area and Discharge (rod-mount from Ceiling)1. install four threaded mounting rods in the threaded holes andsecure in place using lock nuts. (see Table 2).2. securely attach the four mounting rods to the ceiling. (Referto Table 1 for wall and ceiling clearances, and Table 2 formounting rod spacing).

7 Vertical Discharge (rod-Mount from Ceiling)1. Remove bolts from the threaded holes in the back of install four threaded mounting rods in the threaded holes andand secure in place using lock securely attach the four mounting rods to the ceiling. (Referto Table 1 for wall and ceiling clearances, and Table 3 formounting rod spacing dimensions.)Wiring Branch Circuit (Power)1. Connect heater only to the voltage, amperage and frequencyspecified on the field wiring must be properly sized to carry the amperage inaccordance with the The access door is hinged. There are either one or two screwsaccessible from the side that must be loosened to gain screws are the captive type; do not try to remove A knockout is provided in the back of the heater close to thepower terminal block and the control terminal board. The con-trol terminal board knockout is 1/2 inch ( mm) conduit power terminal block knockout is multiple diameter. Usethe diameter that fits the required conduit A ground terminal is provided near the power terminal ground wire should be connected before other connectionsare The power terminal block is equipped with box terminals sizedto accept the correct size power supply wire.

8 Branch circuitwire rated min 600V, 60 C is acceptable for heaters rated up to80 amps. for heaters rated more than 80 amps, branch circuitwire must be rated at least 75 C. Either aluminum or copperwire is satisfactory for connection to the heater power terminalblock box terminal. Copper wire is recommended and must beused with built-in disconnect 1. Horizontal Discharge Mounting and WallBaCKWallSIDEWallMOUNtINGrODlOCK NUtUNIt HEatErTHREADEDMoUNTiNgHoLEsBaDC(tOP VIEW)table 2. rod thread and Spacing Dimensions, inches (mm) for Horizontal Dischargerod threadUnittypeaBCD3 - 5 kw641/163/461/16( ) ( ) ( ) - 10 kw5/16- 18( )15 - 20 kw113/887/851/83/4( )( ) ( ) ( )25 - 30 kw109/1614 - 1263/165/8( ) ( ) ( ) ( )40 - 50 kw3/8- 161515/1614 - 1263/165/8( ) ( ) ( ) ( )table 1. Wall and Ceiling Clearance, inches (mm)UnitDischarge CeilingSide WallBack Wall3 & 5 ( )6 ( )9 ( ) ( )18 ( )18 ( ) to 10 ( )6 ( )13 ( ) ( )24 ( )24 ( )15 to 10 ( )9 ( )121/2( )Vert6 ( )24 ( )24 ( )25 to 50 ( )12 ( )181/2( ) ( )39 ( )39 ( )Figure 2.

9 Vertical Discharge Mounting and rod SpacingCEIlINGBaCKWallSIDEWallACCEssDooR MoUNTiNgRoD (4)THREADEDMoUNTiNgHoLEsCLEARANCE EQUAL To wiDTH ofHEATER To pERMiT fULL opEN-iNg of THE ACCEss DooRLoCK NUTBaCK WallEHfg(tOP VIEW)Table 3. Rod Thread and Spacing Dimensions, inches (mm) for Vertical Dischargerod threadUnittypeEFGH3 - 5 kw693/4241/165/16- 18( ) ) ( ) ( ) - 20 kw87/8145/8251/8( ) ( ) ( ) ( )25 - 30 kw3/8- 16141/2211/423/1663/16( ) ( ) ( ) ( )47. Each heater has a wiring diagram affixed to the inside of theaccess door. Consult this diagram before making any Note - Installation Screw lug torque: During transportation it is possible screw lug connections canloosen. After installation, before power is turned on to the heater,check all screw lug connections for tightness to a recommendedminimum torque of 35 in-lbs. ( N-m). Loose connections maypresent a single or three-phase power connections may be used withheater models MUH0521, MUH0581, MUH072, MUH078,MUH102, MUH108, and MUH158.

10 These units are factorywired for single-phase Operation . if these heaters are foruse with three-phased power, reconnect the wires as indicat-ed in the wiring diagram attached to the heater. Additionalinformation can be found by looking at the wiring illustrationsin figures 3a and 3b and following the directions 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. Theelement lead wire marked B1 which is factory connected to thepower terminal block (terminal located closest to the elements)must be moved to terminal B on the three-phase terminal block. ABLEAD WIRE "B1"ELEMENTSCONTACTOR (OR P2)POWER TERMINAL BLOCKHEATER FRONTLEAD WIRE "A1"3 PHASE BLOCKTO ELEMENTSABLEAD WIRE "B1"ELEMENTSCONTACTOR (OR P2)POWER TERMINAL BLOCKHEATER FRONTLEAD WIRE "A1"3 PHASE BLOCKTO ELEMENTSFACTORY-WIRED FOR SINGLE-PHASE POWER FIELD-WIRED FOR THREE-PHASE POWERF igure 3a.


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