McQuay IM 685 Manuals

Manuals and User Guides for McQuay IM 685. We have 1 McQuay IM 685 manual available for free PDF download: Installation & Maintenance Manual

McQuay IM 685 Installation & Maintenance Manual

McQuay IM 685 Installation & Maintenance Manual (32 pages)

Forced Draft Gas Fired Furnace on McQuay Applied Rooftop Systems

Brand: McQuay | Category: Furnace | Size: 0.49 MB

Table of Contents

Table of Contents
2
General

3
Installation General

3
Start-Up & Operating Procedures Start-Up Responsibility

9
- Start-Up Procedure
  9
- Before Start-Up
  9
- About this Burner
  9
- Set Control System to Enable Heating
  10
- Start-Up Preliminary
  10
- Preliminary "Dry" Run
  10
- Flame Start-Up
  11
- Modulate Firing Rate
  11
- Combustion Tests
  11
- Cycle the Unit
  11
- Record Data
  11
References

12
Flame Safeguard

14
- Keyboard Display Module
  14
- Operation
  14
- LED Display
  15
Service General

16
- Gun Assembly
  16
- Gun Assembly Removal and Installation
  16
- Flame Rod Adjustment
  16
- Flame Rod Installation
  17
- Ignition Electrode Adjustment
  17
- Air and Gas Adjustments
  17
- Gas Supply Pressure
  17
- High Pressure Regulator
  17
- Gas Adjustment
  17
- Air Adjustment
  17
- Air and Gas Control Linkage
  18
- Actuator Crankarm
  19
- Switch Adjustment
  19
- Altitude Considerations
  19
- Gas Valve Pressure Regulator Adjustment
  19
  - Adjustment Procedure for Parallel Valves
    20
  - Check Manifold Pressure at Minimum Rate
    20
- Combustion Testing
  21
- Verify Input Rate
  21
- Check CO 2 , CO and Stack Temperature
  21
- Cleaning Heat Exchanger (Models 032-020)
  21
- Cleaning Heat Exchanger (Models 020-025)
  22
- Leakage Symptoms
  22
- Checking for Leaks
  23
- Causes of Failures
  23
- Replacing Heat Exchanger
  23
- Furnace Condensation
  24
- Rear Cleanout Port
  24
- Combination Fan and Limit Control
  25
Maintenance

25
- Monthly, Twice Yearly, Yearly
  25
Troubleshooting Guide

26
Typical Parts List - 60 Hz

28
Capacities & Adjustments Table

29
Performance & Service History

30

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