Name: McQuay RCS
Brand: McQuay
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IM-738 Page 1

Installation and Maintenance Manual IM-738

Group: Applied Systems

Part Number: IM-738

Date: April 2002

RoofPak

Singlezone Roof Mounted

Heating and Cooling Units with Scroll Compressors

RPS/RDT/RFS/RCS 015-075C

Table of Contents2
Introduction3
Unit Nameplate3
Compressor Nameplate3
Gas Burner Nameplate3
Hazard Identification Information3
Nomenclature3
Unit Description4
Condenser Fan Arrangement6
Refrigerant Circuit Schematic6
Refrigeration Piping7
Control Locations10
Control Panel Locations12
Controls, Settings, and Functions18
Mechanical Installation20
Receiving Inspection20
Unit Clearances20
Ventilation Clearance21
Overhead Clearance21
Roof Curb Assembly and Installation22
Post and Rail Mounting24
Rigging and Handling24
Reassembly of Split Units26
RPS Factory Split at Condenser27
RPS/RDT Factory Split at Fan33
Piping Recommendations35
Holding Charge35
Leak Testing35
Evacuation35
Refrigeration Service Valves37
Charging the System37
Refrigerant Charge37
Subcooling38
Condensate Drain Connection38
Unit Piping38
Steam Coil Piping39
Steam Piping Recommendations39
Steam Trap Recommendations39
Damper Assemblies40
Cabinet Weatherproofing41
Installing Ductwork41
Installing Duct Static Pressure Sensor Taps42
Electrical Installation44
Field Power Wiring44
Field Control Wiring47
Preparing Unit for Operation48
Relief Damper Tie-Down48
Spring Isolated Fans48
Adjustment of Scroll Dampers49
Adjustment of Supply Fan Thrust Restraints49
Adjustment of Seismic Restraints50
Sequences of Operation51
Power-Up51
Fan Operation51
Economizer Operation51
Mechanical Cooling Operation52
Heating53
Wiring Diagrams54
Typical Power Circuit Wiring55
Typical Main Circuit Wiring56
(Inlet Vane & Controls by Others)56
Typical Main Circuit Wiring (VFD & Controls by Others)57
Typical Condensing Unit Control for RPS with Microtech II Control58
Typical Condensing Unit Control W Control Schematic for RPS59
Typical Supply / Return Fan Control Circuit Wiring (no Controls)60
Typical Gas Furnace Control Circuit (Modulating Burner, Mixed Air Intake)61
Unit Options62
Enthalpy Control62
Hot Gas Bypass63
Speedtrol (NA Unit Sizes 015C - 030C)64
External Time Clock65
Smoke Detectors65
Freeze Protection65
Mixed Air Temperature Alarm65
Duct High Pressure Limit65
Variable Inlet Vanes66
Variable Frequency Drive Operation71
Convenience Receptacle/Section Lights71
Designflow‰ Outdoor Air Damper Option71
Propeller Exhaust Fan Option73
Propeller Exhaust Fan Control76
Check, Test, and Start Procedures77
Before Start-Up77
Power-Up77
Fan Start-Up77
Economizer Start-Up78
Compressor Start-Up78
Heating System Start-Up80
Air Balancing80
Sheave Alignment81
Drive Belt Adjustment81
Mounting and Adjusting Motor Sheaves82
Rooftop Equipment Warranty Registration Form85
Final Control Settings89
Maintenance93
Preventive Maintenance93
Unit Storage93
Gas Furnace94
Bearing Lubrication94
Setscrews95
Supply Fan Wheel-To-Funnel Alignment95
Refrigerant Charge96
Replacing Failed Refrigerant Sensors or Switches96
Winterizing Water Coils96
Replacement Parts List97
Service and Warranty Procedure98
Limited Product Warranty (North America)99

Brand	McQuay
Model	RCS
Category	Air Handlers
Language	English

McQuay RCS User Manual

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McQuay RCS Specifications

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