TCS Basys Controls SZ2165 Product Manual
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TCS Basys Controls SZ2165 Product Manual

Boiler controller
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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
2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
SZ2165
Boiler Controller
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Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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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.)
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Summary of Contents for TCS Basys Controls SZ2165

  • Page 1: Table Of Contents

    Mounting • Outdoor air reset control • Two digital inputs for pump status The SZ2165 is designed for mounting using four #10 sheet metal • External time clock input screws. Prior to mounting, the jumpers should be placed. (See setup •...

  • Page 2: Wiring

    Wiring PoWeRing the SZ2165 The SZ2165 is powered from 24 VAC +/- 20 %. If wiring for com- The SZ2165 terminal designations are shown below. munications, dedicated power must be used to power the SZ2165. Several S-series controllers may be powered from the same trans- Remote SenSoR WiRing former, provided that the transformer has enough power.

  • Page 3: Setup

    Holiday The SZ2165 must be programmed with a PC. A jack on the face 1 & Holiday 2 schedules allows local access for programming. If you plan to program the con- as defined.
  • Page 4 DI1 to GND. the LED indication on the SZ2165 will be reversed, i.e. DI2 can be used for Boiler Pump 2 Proving or Monitoring. If Boiler...
  • Page 5 Limit for each setpoint, if desired. ReSet The analog outputs and digital output stages on the SZ2165 can be setup to use a reset function. This is done For a Cooling output (Chiller Stage(s)) the relay energizes when the by placing a check in the appropriate input equals the Chilled Water Setpoint + Offset + Differential and de- Enable Reset box.
  • Page 6 500 psi, or custom. If custom select 0 to 100 psi and fill in the AI pressure range high limit. BoiLeR StAge RotAtion Analog output one on the SZ2165 can be used to control Hot Water Supply Temperature, Mixed Water Temperature or control based on Pressure.
  • Page 7 SZ2165 will make the number of days for a holiday 0 after the set point. The derivative term is divided by the PID delay. The default holiday is over.

  • Page 8: Sequence Of Operations

    PC. Observe the operation of the relay stages and or analog ouput(s). HOT WATER SUPPLY TEMP 5. Note that the operation of the SZ2165 will depend on how it is programmed. The SZ2165 is now ready for operation. 140°F...

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