McQuay RDT

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
© 2002 McQuay International

McQuay RDT Specifications

General

Brand	McQuay
Model	RDT
Category	Air Handlers
Language	English

Summary

Introduction

Hazard Identification Information

Warnings and cautions regarding potential hazards during installation and operation.

Unit Description

Typical Component Locations

Diagrams showing the location of major components in RPS and RDT units.

Condenser Fan Arrangement

Refrigerant Circuit Schematic

Diagram illustrating the refrigerant circuit with component labels.

Refrigeration Piping

Control Locations

Figure 7. Control Locations - RPS Units

Diagram showing control component locations on RPS units.

Control Panel Locations

Figure 9. Control Panel Locations

Diagrams illustrating the locations of various unit control panels.

Condenser Control Panel Diagrams

Figure 12. Condenser Control Panel with MicroTech II (015 C thru 030 C)

Diagram of the condenser control panel for specific unit sizes.

Figure 14. Condenser Control Panel with MicroTech II (045 thru 075)

Diagram of the condenser control panel for specific unit sizes.

Figure 13. Condenser Control Panel with MicroTech II (036 C thru 060 C)

Diagram of the condenser control panel for specific unit sizes.

Figure 15. Condenser Control Panel with No Controls - RPS (036 thu 075)

Diagram of the condenser control panel for specific unit sizes.

Figure 16. Condenser Control Panel with No Controls - RPS (015 thu 030)

Diagram of the condenser control panel for specific unit sizes.

Electric Heat Control Panel Diagrams

Figure 17. Electric Heat Control Panel - sizes 15 - 40 C

Diagram of the electric heat control panel for specific unit sizes.

Figure 18. Electric Heat Control Panel - Sizes 45 - 75 C

Diagram of the electric heat control panel for specific unit sizes.

Controls, Settings, and Functions

Table 3: Controls, settings and functions

Lists unit control devices, their descriptions, functions, and settings.

Controls, Settings, and Functions (continued)

Table 4: Controls, settings and functions (continued)

Continues the listing of unit control devices, descriptions, functions, and settings.

Mechanical Installation

Receiving Inspection

Procedures for inspecting the unit upon receipt for damage or shipping issues.

Unit Clearances

Recommended clearances for service access around the unit.

Service Clearance

Roof Curb Assembly and Installation

Figure 21. RCS Roof Curb Assembly

RPSRDT Assembly instructions

RCS Assembly instructions

Figure 22. RPSRFS Roof Curb Assembly

Post and Rail Mounting

Figure 23. Post and Rail Mounting

Rigging and Handling

Figure 24. Rigging and Handling Instruction Label

Lifting Points

Figure 25. Unit Type RPSRDT Lifting Points

Figure 26. Unit type RFS Lifting Points

Reassembly of Split Units

Figure 27. Figure 10 c. Unit Type RCS

Figure 28. Unit Type RCS or Condenser Section from RPSRDT Factory Split at Condenser

RPS Factory Split at Condenser

Phase 2. Reconnecting Refrigerant Piping

Procedures for reconnecting refrigerant piping between split unit sections.

Phase 3. Reconnecting Power and Control Wiring

Steps for reconnecting power and control wiring for split units.

Refrigerant Piping Connections

Figure 30. RFSRCS 015-030 Refrigerant Piping Connections

Diagrams illustrating refrigerant piping connections for RFS/RCS units.

Figure 31. RFSRCS 036 & 040 Refrigerant Piping Connections

Diagrams illustrating refrigerant piping connections for RFS/RCS units.

Figure 32. RPS (Split) RFSRFR 045-135 RCS 045-075 Refrigerant Piping Connections

Reconnecting Power and Control Wiring

Figure 36. Connecting Power and Control Wiring (015-040)

Figure 37. Connecting Power and Control Wiring (045-075)

RPSRDT Factory Split at Fan

Phase 1. Setting the Sections and Cabinet Reassembly

Phase 2. Reconnecting Power and Control Wiring

Procedures for reconnecting power and control wiring after fan split.

Piping Recommendations

Table 9: Minimum tonnage (R-22) to carry oil up suction riser at 40 F saturated suction

Leak Testing

Evacuation

Refrigerant Charge Data

Approximate Refrigerant Charge Tables

Tables detailing approximate refrigerant charge and refrigerant weight in copper lines.

Charging the System

Refrigerant Charge Details

Details on calculating and verifying the total refrigerant charge per circuit.

Installing Ductwork

Installing Duct Static Pressure Sensor Taps

Field Power Wiring

Figure 52. RPSRDT and RFS Power Wiring Connections

Fan Control Options

Fan Trol System Description

Description of FanTrol system for head pressure control.

FanTrol Setpoints Tables

Tables of FanTrol setpoints for units with and without MicroTech II controls.

Field Control Wiring

Control Wiring Diagrams

Preparing Unit for Operation

Spring Fan Mounts and Adjustments

Fan Assembly Diagrams

Adjustment of Seismic Restraints

Figure 64. Cross Section of Seismic Restraint

Sequences of Operation

Power-up Sequence

Fan Operation Sequence

Economizer Operation Sequence

Sequences of Operation (continued)

Mechanical Cooling Operation

Describes the operation of mechanical cooling for four-compressor units.

Lead Circuit Loading and Compressor Safeties

Explanation of compressor loading and safety device functions.

4-Compressor4 Stage Unit Operation

Detailed sequence of operation for 4-compressor/4-stage cooling units.

Gas Furnace Operation and Safety Lockout

Wiring Diagrams

Typical Power Circuit Wiring (6 Compressor Arrangement with VFD Shown)

Typical Main Circuit Wiring (with Inlet Vane and Controls by Others)

Typical Main Circuit Wiring (with VFD and Controls by Others)

Typical Condensing Unit Control for RPS with MicroTech II Control (4 Compressor Unit Shown, RCS Has Minor Variations)

Typical Condensing Unit Control with Control Schematic for RPS (Controls by Others, 6 Compressor Unit Shown, RCS Has Minor Variations)

Typical Supply Return Fan Control Circuit Wiring (No Controls)

Typical Gas Furnace Control Circuit (Modulating Burner, Mixed Air Intake)

Hot Gas Bypass System

Hot Gas Bypass Diagrams and Adjustments

SpeedTrol Fan Control

SpeedTrol (NA Unit Sizes 015 C - 030 C)

Explanation of SpeedTrol system for head pressure control in specific unit sizes.

Figure 68. SpeedTrol Schematic

Unit Options and Alarms

External Time Clock, Smoke Detectors, Freeze Protection, and Alarms

Duct High Pressure Limit

Control to prevent duct over-pressurization, with adjustment details.

Variable Inlet Vanes

Minimum Vane Position

Supply Fan Vane Adjustment

Return Fan Vane Adjustment

Actuator Rotation Adjustment

DesignFlow Airflow Measurement Station

DesignFlow Startup and Leveling Procedures

Variable Frequency Drive Operation

Fan Maintenance and Troubleshooting

Fasteners, Lubrication, and Dust Removal

Table 20: Propeller Exhaust Fan Troubleshooting

Table listing common problems, causes, and corrective actions for propeller exhaust fans.

Propeller Exhaust Fan Control

Exhaust Fan Control Logic and Keypad Entries

Check, Test, and Start Procedures

Before Start-up and Unit Power-up

Preliminary checks, verifications, and unit power-up steps.

Fan Start-up Procedures

Check, Test, and Start Procedures (continued)

Economizer and Compressor Start-up

Procedures for starting economizer and compressors, including safety precautions.

Figure 85. Condenser Fan Blade Positioning

System Adjustments and Start-up

Expansion Valve Superheat Adjustment and Checking

Procedure for adjusting and checking superheat for optimal system performance.

Heating System Start-up and Air Balancing

Steps for starting heating systems and performing air balancing.

Motor Sheave Mounting and Adjustment

Variable Pitch Sheave Mounting and Adjustment

Instructions for mounting and adjusting VM and VP variable pitch sheaves.

Motor Sheave Mounting and Adjustment (continued)

MVP Variable Pitch Sheaves Adjustment

Instructions for adjusting MVP variable pitch sheaves.

Rooftop Equipment Warranty Registration Form

INITIAL CHECK, FAN DATA, and START-UP COMPRESSOR OPERATION

Initial checks, fan data recording, and compressor start-up procedures.

Rooftop Equipment Warranty Registration Form (continued)

PERFORMANCE DATA and ELECTRIC HEAT CHECK, TEST & START

Recording performance data and electric heat checks during startup.

Burner System Checks and Control Parameter Records

Checks for gas/oil burners and guidance on maintaining control parameter records.

QUALITY ASSURANCE SURVEY REPORT

Survey questions regarding product appearance, installation, and quality.

Final Control Settings

Maintaining Control Parameter Records

Maintenance

Preventive Maintenance and Unit Storage

Recommended routine maintenance tasks and precautions for unit storage.

Preparation Steps

Fan Setscrew and Alignment Procedures

Setscrews, Torque Specifications, and Return Fan Bearing Setscrews

Supply Fan Wheel-to-Funnel Alignment

Procedure for aligning supply fan wheels to the funnel for optimal airflow.

Figure 96. 20 Airfoil Wheel-to-Funnel (015 C-030 C)

Refrigerant Handling and Components

Refrigerant Charge, Sensor Replacement, and Winterizing Water Coils

Procedures for refrigerant charge, replacing sensors, and winterizing water coils.

Replacement Parts List

Table 29: Microtech II Components Parts List

List of Microtech II components and their McQuay part numbers.

Service and Warranty Procedure

Replacement Parts Ordering, Compressor Replacement, and Return Material Procedure

Procedures for ordering parts, replacing compressors, and returning warranty materials.

Limited Product Warranty (North America)

Warranty Terms, Exceptions, and Assistance