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Summary of Contents for Johnson Controls ENVIRO-TEC MQL B Series
- Page 1 INDOOR AIR HANDLING UNIT BY JOHNSON CONTROLS INSTALLATION, OPERATION Supersedes: ET102.19-NOM1 (1012) Form ET102.19-NOM1 (813) & MAINTENANCE MODEL MQL SERIES B Issue Date: August 26, 2013...
- Page 2 All wiring must be in accor- dance with Johnson Controls’ published specifications and must be performed only by a qualified electrician. Johnson Controls will NOT be responsible for damage/problems resulting from improper connections to the controls or application of improper control signals.
- Page 3 More than one source of power may be power and control circuits prior to servic- present. Disconnect all power sources ing to avoid burns. to avoid electrocution or shock injuries. JOHNSON CONTROLS...
- Page 4 CHANGEABILITY OF THIS DOCUMENT In complying with Johnson Controls’ policy for con- these documents, the technician should verify whether tinuous product improvement, the information con- the equipment has been modified and if current litera-...
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Page 5: Table Of Contents
Air Balancing ............................20 Sheaves ............................20 SECTION 4 - PERIODIC MANINTENANCE AND SERVICE .................21 PERIODIC MAINTENANCE AND SERVICE ....................21 General ..............................21 After 48 Hours of Operation ........................21 Weekly ..............................21 Every Month ............................21 Every Three to Six Months ........................21 JOHNSON CONTROLS... - Page 6 Vibration Levels .............................29 Vibration Causes ...........................30 Periodic Service and Maintenance ......................30 APPLICATION RECOMMENDATION FOR COILS ..................30 General ..............................30 Water Cooling Coils ..........................30 Direct Expansion Coils ..........................30 Steam Coils ............................31 Water Heating Coils..........................32 SECTION 5 - TROUBLESHOOTING ........................33 JOHNSON CONTROLS...
- Page 7 TABLE 4 - Fan Bearing Maximum Grease Capacity ....................20 TABLE 5 - Recommended Motor Greasing Schedule ....................21 TABLE 6 - Determining Deflection Force ........................25 TABLE 7 - Forward Curve Fan Data ........................26 TABLE 8 - Vibration Levels .............................26 TABLE 9 - MQL Troubleshooting Analysis ......................29 JOHNSON CONTROLS...
- Page 8 FORM ET102.19-NOM1 LIST OF FIGURES ISSUE DATE:08/26/2013 THIS PAGE INTENTIONALLY LEFT BLANK. JOHNSON CONTROLS...
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Page 9: Section 1 - Introduction
Modules bolt together from the inside of the upstream equipment is ready for final placement, as damage to module. equipment can result. Do not remove protective caps from piping connections until ready to connect piping. FIGURE 1 - LIFT POINTS FOR UNITS WITH BASE RAILS JOHNSON CONTROLS... -
Page 10: Storage
Set equipment off ground if in moisture prone areas. STORAGE To transfer equipment from truck to storage site, refer to Rigging And Handling on page 9 FIGURE 2 - LIFT POINTS FOR UNITS WITH BASE RAILS JOHNSON CONTROLS... -
Page 11: Assembling Equipment
If the dampers are different sizes they must be driven by individual actuators and con- trolled separately. FIGURE 4 - ASSEMBLY, UNITS WITH BASE RAILS JOHNSON CONTROLS... - Page 12 FORM ET102.19-NOM1 SECTION 1 - INTRODUCTION ISSUE DATE:08/26/2013 THIS PAGE INTENTIONALLY LEFT BLANK. JOHNSON CONTROLS...
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Page 13: Section 2 - Installation
The MQL product line is not designed to be suspended from the top of the equipment. Be- fore hanging the equipment, all field assembly must be completed. JOHNSON CONTROLS... -
Page 14: Figure 7 - Hand Identification
FORM ET102.19-NOM1 SECTION 2 - INSTALLATION ISSUE DATE:08/26/2013 Left Hand Fan Access Door FIGURE 7 - HAND IDENTIFICATION JOHNSON CONTROLS... -
Page 15: Suspending Using Field Supplied Supports
TXV. All FIGURE 8 - REMOVE HOLD DOWNS coil connections are stubbed out of cabinet panel with the exception of refrigerant (DX) coils. Field penetra- tion of panels is required for liquid line piping. FIGURE 9 - ISOLATOR INSTALLATION JOHNSON CONTROLS... -
Page 16: Dx Connection Steps
To ensure that the trap remains sealed the trap depth and the distance between the pan outlet and the trap outlet should be the total static pressure of the unit plus one inch (see Figure 10 on page 16). JOHNSON CONTROLS... -
Page 17: Inspection & Start-Up Checklist
Install Ductwork, Fittings & Grilles As Required Control 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 JOHNSON CONTROLS... - Page 18 FORM ET102.19-NOM1 SECTION 2 - INSTALLATION ISSUE DATE:08/26/2013 JOHNSON CONTROLS...
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Page 19: Section 3 - Startup
Operation of the units in conditions out- Thorough safety precautions should always be taken lined above could result in damage to the equipment when performing startup and service. Only qualified or buildings and furnishings and void all manufacturer individuals should perform these tasks. warranty. JOHNSON CONTROLS... -
Page 20: First Time Motor Startup
6. Be sure that all shipping materials, braces, and construction debris are out of equipment. 7. Manually rotate motor shaft to ensure that it ro- tates freely. 8. Replace all panels that were removed during in- stallation. JOHNSON CONTROLS... -
Page 21: Section 4 - Periodic Manintenance And Service
• Align fan and motor 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. JOHNSON CONTROLS... -
Page 22: Drain Pan
1. Disconnect all electrical power to the unit, tag and mild bleach and water solution or an EPA-ap- lock out power source. proved sanitizer specifically designed for HVAC 2. Put on appropriate personal protective equipment. use. Carefully follow the sanitizer manufacturer JOHNSON CONTROLS... -
Page 23: Fan Bearings
Table 4 on page 23 for recommended greasing which ever occurs first. Operating conditions will vary intervals, operating range, and bearing grease capacities. the frequency of inspection and lubrication. Table 5 (Table 5 on page 25) lists recommended motor JOHNSON CONTROLS... -
Page 24: Lubrication And Bearings
Refer to Table 1 on page 22 for minimum torque of A high-grade ball or roller bearing grease should be motor mounting and bearing bolts. used. See Table 3 on page 23 for Recommended Greases. Chevron SRI (Factory Installed) - Polyurea Base JOHNSON CONTROLS... -
Page 25: Drives
If the setscrew (a) is not fully in contact setscrews and capscrews are torqued properly be- with key, the sheave assembly could come fore starting drive. Check setscrew and belt ten- off. sion after 24 hours of service. JOHNSON CONTROLS... -
Page 26: Mounting Split Tapper Sheaves
5. Adjust pitch diameter by opening or closing the movable flange(s) by a half or full turn. Opening the flange(s) will decrease the blower speed, clos- ing the flange(s) will increase blower speed. JOHNSON CONTROLS... -
Page 27: Belts
• Mount belts straight. Shaft must be parallel and sheave grooves in alignment to prevent unneces- sary belt wear. LD14011 • Do not overload belt. Belts have a specific HP rat- ing that must not be exceeded. FIGURE 14 - BELT TENSION JOHNSON CONTROLS... -
Page 28: Coils
2501 - 4000 400 - 2500 3.8 - 4.8 2501 - 4000 400 - 2500 5.0 - 7.0 2501 - 4000 860 - 2500 4.4 - 5.6 2501 - 4000 860 - 2500 5.8 - 8.6 2501 - 4000 JOHNSON CONTROLS... -
Page 29: Refrigerant Coils
9. Replace all panels and parts and restore electrical enduring the rigors of shipping and installation. The power to the unit. following is accepted industry guidelines for field-bal- ancing fans found in Table 8 on page 30. JOHNSON CONTROLS... -
Page 30: Vibration Causes
.20 in/sec. Maximum velocity Note: Excessive vibration from any cause contributes to premature fan and motor bearing failure. Overall, vibration levels should be monitored every six months of operation. An increase in levels is an indication of potential trouble. JOHNSON CONTROLS... -
Page 31: Steam Coils
Consideration should be given to the use of 6. Do not drip supply mains through the coil. two or three coils in series with two posi- tion steam control valves on that coil or coils JOHNSON CONTROLS... -
Page 32: Water Heating Coils
Provision must be made to close fresh air enters the coil. dampers if steam supply pressure falls below minimum specified. JOHNSON CONTROLS... -
Page 33: Section 5 - Troubleshooting
Remove fan cover, clean fan and replace preventing Motor fan is clogged with dirt. MOTOR OVERHEATS proper ventilation cover. Temperature leaving heating sec- Increase airflow volume, reduce hot water inlet tem- tion is too high. perature, turn thermostat down. JOHNSON CONTROLS... - Page 34 STANDING WATER Improper trap design. Design trap for unit. IN DRAIN PAN Missing filters. Replace filters. EXCESS DIRT IN UNIT Filter bypass. Reduce filter bypass. MOLD INSIDE AIR HANDLER Standing water in drain pan. See “Standing water” symptoms. JOHNSON CONTROLS...
- Page 35 FORM ET102.19-NOM1 SECTION 5 - TROUBLESHOOTING ISSUE DATE:08/26/2013 JOHNSON CONTROLS...
- Page 36 P.O. Box 1592, York, Pennsylvania USA 17405-1592 800-861-1001 Subject to change without notice. Printed in USA Copyright © by Johnson Controls 2012 www.johnsoncontrols.com ALL RIGHTS RESERVED Form ET102.19-NOM1 (713) Issue Date: October 16, 2012 Supersedes: ET102.19-NOM1 (1012)
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