Installation manual

Page 2 IM-487
Table of Contents
Introduction .......................................................................... 3
Receiving Inspection .........................................................3
Hazard Identification Information .....................................3
Nomenclature ....................................................................3
Typical Component Locations ......................................... 4
Typical Unit Sections ....................................................... 7
Control Locations ............................................................. 8
Control Panel Locations ................................................... 9
Controls, Settings, and Functions ................................... 13
Mechanical Installation ...................................................... 14
Unit Clearances ...............................................................14
Ventilation Clearance ..................................................... 15
Overhead clearance ..........................................................15
Roof Curb Assembly and Installation .............................16
Post and Rail Mounting .................................................. 18
Rigging and Handling ......................................................18
Split Units ........................................................................19
Reassembly of Split Units .............................................. 20
Installing Ductwork .........................................................22
Installing Duct Static Pressure Sensor Taps ....................22
Installing Building Static Pressure Sensor Taps ..............23
Condensate Drain Connection ........................................ 24
Field Refrigerant Piping and Charging of DX Coils .......25
Piping Recommendations ............................................... 25
Leak Testing ................................................................... 26
Evacuation .......................................................................26
Charging the System ........................................................26
Refrigerant Charge ..........................................................27
Unit Piping ..................................................................... 28
Vestibule Assembly Instructions .................................... 33
Damper Assemblies ........................................................ 35
Cabinet Weatherproofing ................................................39
Electrical Installation ......................................................... 40
Field Power Wiring .........................................................40
Field Control Wiring .......................................................42
Preparing Unit for Operation ............................................. 43
Relief Damper Tie-Down ................................................43
Spring Isolated Fans ........................................................43
Adjustment of Seismic Restraints ...................................44
Adjustment of Scroll Dampers ........................................45
Sequences of Operation ..................................................... 46
Power-up ..........................................................................46
Fan Operation ..................................................................46
Economizer Operation .....................................................46
Heating ............................................................................47
Wiring Diagrams ................................................................ 48
Typical Control Circuit with Power Pack Only ..............50
Typical Power Circuits ....................................................50
Typical Compressor Staging Outputs .............................51
Typical Main Control Circuit (VAV Units) ....................52
Typical Main Control Schematic (CAV Units) ..............54
Typical Actuator Circuit .................................................56
Typical Supply/Return Fan Control Circuit ....................57
Typical Gas Furnace Control Circuit
(Modulating Burner, Mixed Air Intake) .........................58
Typical Electric Heat Control Circuit (Multi-Stage) ......59
Unit Options ........................................................................60
Enthalpy Control .............................................................60
External Time Clock .......................................................60
Smoke Detectors .............................................................60
Freeze Protection .............................................................61
Mixed Air Temperature Alarm .......................................61
Duct High Pressure Limit ................................................61
Variable Inlet Vanes ........................................................61
Actuator Rotation Adjustment ........................................62
Variable Frequency Drive Operation ..............................67
Convenience Receptacle/Section Lights .........................67
DesignFlow Outdoor Air Damper Option .......................67
Propeller Exhaust Fan Option .........................................69
Propeller Exhaust Fan Control ........................................72
Before Start-up ................................................................73
Power-up .........................................................................73
Fan Start-up .....................................................................73
Economizer Start-up ........................................................74
Heating System Start-up ..................................................74
Cooling System Start-up .................................................74
Adjusting MicroTech II Controls and Servicing Control
Panel Components ...........................................................75
Air Balancing ..................................................................75
Sheave Alignment ...........................................................75
Drive Belt Adjustment .................................................... 76
Mounting and Adjusting Motor Sheaves ........................77
Final Control Settings .........................................................80
Maintenance ........................................................................84
Planned Maintenance .....................................................84
Unit Storage .....................................................................84
Gas Furnace .....................................................................85
Bearing Lubrication .........................................................85
Airfoil Supply Fan Wheel-to-Funnel Alignment ............86
Winterizing Water Coils ..................................................87
Standard Limited Product Warranty ...................................87
Service and Warranty Procedure ........................................87
Replacement Parts List .......................................................88