Rev 3.1 01/11/23 - 1 - Model 600 User Guide
1 Overview
The Quest Controls Model 600 is designed to control two HVAC systems for lead/lag operation. The system
supports heat pumps, single stage and two stage mechanical cooling systems that use a standard 24VAC control
interface. The Model 600 will control HVAC units with built in economizers using control using Quest’s patented
Economizer Control Algorithm. The system is an easy-to-use lead/lag controller for small to medium-sized
mission-critical facilities such as telecommunications, cable/broadband, and Utility facilities.
The Quest Controls Model 600 provides functionality and configurability to accommodate most conventional
HVAC & heat pump applications. The application-specific approach ensures that commissioning is
straightforward and hassle-free. The Model 600 contains internal programming logic to operate independently
and can be configured to lock out local access to ensure programming integrity and ongoing correct control. The
Model 600 remotely communicates through Modbus RTU to Quest’s ESB2, MP2 and MP3 systems or any
Modbus polling agent.
1.1 Features and Benefits
• Controls two HVAC systems for Lead/Lag or Lead/Standby operation.
• Stand-alone or network operation to control HVAC systems.
• Modbus RTU communications
• Control based on one or two remote zone temperature sensors or both choosing the average or highest
reading.
• Monitor zone temp, humidity, HVAC lockout, and control voltage present.
• Use industry-standard 10k type 3 thermistor.
• Backlight display - 2-line 16-character display for ease of use
• Adjustable Min & Max run time for stages
• 5 button keypad and display for easy programming plus keys for Lead Switch and Comfort Mode
• Lockout or limit user access via password on the front display
• Temperature displayed in F or C
2 Installation
The Model 600 is designed to be wall-mounted inside the controlled and monitored facility. This section will
provide basic guidelines for installing the system. Refer to specific installation drawings for your particular
application or contact Quest Controls, Inc. for assistance if your application is not covered in this section. All
local and national electrical safety standards must be followed when installing the Model 600. If there is any
contradiction in this manual and those standards, then the installer must follow the local and national
standards. Use copper conductors only.
2.1 Mounting
Mount the Model 600 on an interior wall in a location that is accessible for wiring and attainable to the color
touchscreen on the front of the system. It is recommended to mount the controller no higher than six feet
above the finished floor so that the touchscreen is easily accessible. Use appropriate mounting hardware
(screws, anchors etc.) based on the wall material to properly secure the Model 600 to the wall. Knockouts are
provided on all sides for conduit and routing of wires into the enclosure.
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