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2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
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SZ2165
Boiler Controller
Product Manual
Description
The SZ2165 is a microprocessor based boiler controller. It is
designed for use on multi-stage boiler applications and includes
chiller support and control.
Features
• Stand-alone or network operation
• 365-day time clock with two holiday schedules, automatic leap
year and daylight saving correction
• No backup battery required for control parameters, schedule or
clock
• Hot water supply and return water temperature inputs
• Mixed water temperature input
• Chilled water supply and return temperature input
• Two digital outputs for chillers
• One digital output for alarm
• Outdoor air temperature input
• Outdoor air reset control
• Two digital inputs for pump status
• External time clock input
• Six digital outputs for boilers and boiler pumps
• Adjustable offsets and differentials on digital outputs
• Lead/Lag sequencing (rotation) of up to four boilers
• Two modulating analog outputs for valves and VFD
• LEDs for monitoring status
• Automatic rotation of pumps
• Alarm output
• Selectable normally open or normally closed relay outputs
Contents
Description
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1
Features
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1
Mounting
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1
Wiring
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2
Setup
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3
Programming
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3
Sequence of Operations
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8
Checkout & Troubleshooting
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8
LED Description
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9
Mounting
The SZ2165 is designed for mounting using four #10 sheet metal
screws. Prior to mounting, the jumpers should be placed. (See setup
instructions.) If the unit will be stand-alone, all programming should
be completed before installation. If the unit will be wired for communi-
cations, a unique address should be programmed into the unit. (See
programming instructions.)