Enviro MQL B Series Installation Operation & Maintenance Download Page 36

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Catalog: ET102.19-NOM1 (0521) Supersedes ET102.19-NOM1 (517)
ENVIRO-TEC is a mark and/or registered mark. Unauthorized use is strictly prohibited.
© 2021 Johnson Controls
www.enviro-tec.com

Summary of Contents for MQL B Series

Page 1: ...MODEL MQL SERIES B INSTALLATION OPERATION MAINTENANCE INDOOR AIR HANDLING UNIT Supersedes ET102 19 NOM1 517 Form ET102 19 NOM1 0521...

Page 2: ...r with and comply with all applicable governmental standards and regulations pertaining to the task in question SAFETY SYMBOLS The following symbols are used in this document to alert the reader to sp...

Page 3: ...ushing or dismember ment injuries HOT PARTS HAZARDS Electric Resis tance heating elements must be discon nected prior to servicing Electric Heaters may start automatically disconnect all power and con...

Page 4: ...y rigging and lifting equipment All assemblies must be adequately se cured during lifting and rigging by temporary supports and restraints until equipment is permanently fastened and set in its final...

Page 5: ...rnal Isolation 15 External Isolation 15 Service Clearance 15 Panel Removal 15 General Piping 15 DX Connection Steps 16 In the field 16 Notes 16 Condensate Drain 16 Electrical Installation 16 INSPECTIO...

Page 6: ...25 Mounting Straight Bore Sheaves 25 Mounting Split Tapper Sheaves 26 Adjust Variable Pitched Sheaves 26 Belts 27 Adjusting Belt Tension 27 How to Increase Belt Life 27 Coils 28 Steam Hot Water and Ch...

Page 7: ...Sheaves 21 FIGURE 12 Sheave Alignment 22 FIGURE 13 Split Tapper Sheave Mounting 22 FIGURE 14 Belt Tension 23 TABLE 1 Minimum Hex Head Bolt Torque In Lb Ft Grade 5 Bolt 18 TABLE 2 Recommended Greasing...

Page 8: ...THIS PAGE INTENTIONALLY LEFT BLANK ENVIRO TEC 8 FORM ET102 19 NOM1 0521 LIST OF FIGURES...

Page 9: ...To ensure the assembled MQL modules are in the proper sequence each module has an identifying code and an airflow direction label The proper assembly sequence is listed on the supply fan nametag The...

Page 10: ...balanced Rough handling may cause bearing misalignment and or shaft damage STORAGE To transfer equipment from truck to storage site refer to Rigging And Handling on page 9 If a forklift is used lift...

Page 11: ...e actuator if the damp ers are the same size If the dampers are different sizes they must be driven by individual actuators and con trolled separately b Remove all shipped loose parts from job site to...

Page 12: ...THIS PAGE INTENTIONALLY LEFT BLANK ENVIRO TEC 12 FORM ET102 19 NOM1 0521 Section 1 introduction...

Page 13: ...ed from a ceil ing a base rail angle iron or channel must support the equipment The MQL product line is not designed to be suspended from the top of the equipment Be fore hanging the equipment all fie...

Page 14: ...Left Hand Fan Access Door Figure 7 HAND IDENTIFICATION ENVIRO TEC 14 FORM ET102 19 NOM1 0521 Section 2 installation...

Page 15: ...oil module is also isolated the piping must be isolated or have a flexible connection to prevent coil header damage due to equipment movement All piping wiring ductwork and external connections must b...

Page 16: ...at pump condensing units but require the addition of fittings or refrigerant specialties to be furnished and installed by others Condensate Drain All condensate drains must have a trap installed This...

Page 17: ...l Outside Air For Freeze Protection Proper Supply Return Grille Type Size Used Insulate All Ductwork As Required Verify All Ductwork Is Complete Dampers And Filters Are Installed Prior To Startup E EL...

Page 18: ...INTENTIONALLY LEFT BLANK ENVIRO TEC 18 FORM ET102 19 NOM1 0521 Section 2 installation...

Page 19: ...nly qualified individuals should perform these tasks Before entering the fan section make sure that the fan electrical power source is disconnected locked and tagged out in the OFF position 1 Check th...

Page 20: ...pment 7 Manually rotate motor shaft to ensure that it ro tates freely 8 Replace all panels that were removed during in stallation 9 Momentarily apply power and check direction of rotation of motor sha...

Page 21: ...sheaves Tighten sheave set screws to the proper torque see Table 1 on page 22 Check and adjust fan belt tension Tighten electrical connections Inspect coils for dirt build up or coil freeze up Every...

Page 22: ...posal of their product 6 Immediately rinse the drain pan thoroughly with fresh water to prevent potential corrosion from the cleaning solution of the drain pan and drain line components 7 Allow the un...

Page 23: ...ch conforms to NLGI Number 2 for consis tency See Table 2 on page 23 Table 3 on page 23 and Table 4 on page 23 for recommended greasing intervals operating range and bearing grease capacities Table 2...

Page 24: ...of operation It is important to remember that this recommendation is base of average use Refer to Table 2 on page 23 for additional information Types of Grease A high grade ball or roller bearing grea...

Page 25: ...5 The sheave should be close to the motor as possible with setscrew A in full contact with the key If the setscrew a is not fully in contact with key the sheave assembly could come off 4 Be sure that...

Page 26: ...ft 8 Tighten capscrews progressively with wrench Dothis following a star pattern taking a partial turn on each capscrew successively until all are tight see Table 1 on page 22 for proper torque Do not...

Page 27: ...be used to calculate the belt span LD14003 2 2 2 d D C Span C Center distance shaft to shaft D Driver sheave large sheave pitch diameter d Driver sheave small sheave pitch diameter 2 Calculate deflect...

Page 28: ...urface of the coil reduces its ability to transfer heat that can result in reduced performance and increased operating energy costs If the dirt on the surface of the coil becomes wet which commonly oc...

Page 29: ...10 Use caution to assure that any contaminated ma terial does not contact other areas of the unit or building Properly dispose of all contaminated ma terials and cleaning solutions Winterizing Water C...

Page 30: ...ON LEVELS FAN SPEED RPM VIBRATION 800 or less 5 mils maximum displacement 801 or greater 20 in sec Maximum velocity Note Excessive vibration from any cause contributes to premature fan and motor beari...

Page 31: ...l applications to prevent retaining con densate in the coil Generally the vacuum breaker is to be connected between the coil inlet and the return main the vacuum breaker should be open to the atmosphe...

Page 32: ...se fresh air dampers if steam supply pressure falls below minimum specified Water Heating Coils 1 Water supply and water return connections extend through the end panel of the coil section All con nec...

Page 33: ...k bear ing lubricant MOTOR STALLS Open phase Check line for an open phase Overloaded motor Reduce load or replace with larger motor Low line voltage Check voltage across AC line Correct voltage if pos...

Page 34: ...ignment Loosen bearing setscrews and realign see Fig 10 Inadequate lubrication Grease bearing s LOW COIL CAPACITY CHILLED WATER Air is bypassing coil Prevent bypass with block offs Coil tubes are bloc...

Page 35: ...5 ENVIRO TEC 35 Section 5 TROUBLESHOOTING FORM ET102 19 NOM1 0521...

Page 36: ...Catalog ET102 19 NOM1 0521 Supersedes ET102 19 NOM1 517 ENVIRO TEC is a mark and or registered mark Unauthorized use is strictly prohibited 2021 Johnson Controls www enviro tec com...

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