Legacy Building Systems
W7081 Limit Controller
Used with W7080A Load Analyzer to provide cold deck low limit, hot deck high limit, and economizer/mixed air low limit functions.
• Limits the maximum and minimum temperatures of the hot and cold deck and of the mixed air by supplying modified demand signals to the W7080A Load Analyzer and to the economizer
• The positive limits stabilize deck temperatures under light load conditions providing greater comfort and reducing energy usage
• Has jumper selectable set points for each of its 3 functions
• Compact to fit easily in HVAC system control panel
• Mounts with 4 No. 8 screws (not provided) through holes in base
Application Size: Small (<20 I/O Points)
Dimensions, Approximate: 6 1/4 in. high x 4 1/8 in. wide x 2 5/16 in. deep (159 mm high x 105 mm wide x 59 mm deep)
Electrical Connections: 1/4 in. quick-connect male terminals
Power Consumption: 0.29 VA maximum
Operating Temperature Range: -40 F to +150 F (-40 C to +65 C)
Shipping Temperature Range: -40 F to +150 F (-40 C to +65 C)
Approvals
ASHRAE Guidelines: Meets ASHRAE 90-75
Canadian Standards Association: Component Recognized Department of Defense Guidelines: Meets
Underwriters Laboratories, Inc: Component Recognized
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Product Number |
Application |
Control System |
Compatible with: |
Description |
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W7081A1015/U |
Split System; Heat Pump Systems; Furnace; Packaged RTU |
W7080 control system |
W7080 Load analyzer |
Limit Controller |
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W7100A,C Discharge Air Temperature Controller
Maintain an average discharge air temperature in variable air volume (VAV) systems, or other systems requiring discharge air control of multistage cooling or heating. Reduce kilowatt demand
and consumption by maintaining the minimum amount of heating or cooling capacity required to hold the discharge air set point. Utilize economizer for free cooling when available.
•W7100 Controller maintains an average discharge air temperature in variable air volume (VAV) cooling systems by modulating an economizer and sequencing stages of mechanical cooling
•The W7100 can be applied to electric makeup air and other systems requiring discharge air control of multistage heating or cooling
•Staging capacity of the W7100A,C can be extended six stages using a W7101A Satellite Sequencer
•When power is interrupted, the system cycles to all stages off
•When power is restored, the economizer will first be modulated open (if enthalpy is suitable), then stages of mechanical cooling will be sequenced on
•If enthalpy is not suitable for economizer operation, the first stage of cooling or heating is energized within five minutes
•Reset signal from either space sensor or outdoor air sensor
Dimensions, Approximate: 8 5/8 in. high x 6 1/2 in. wide x 3 in. deep (219 mm high x 161 mm wide x 76 mm deep)
Contact Ratings:
NO 240 VA inrush @ 24 Vac, 60 VA running @ 24 Vac NC 75 VA inrush @ 24 Vac, 30 VA running @ 24 Vac
NO 750 VA inrush @ 120/240 Vac, 75 VA running @ 120/240 Vac NC 240 VA inrush @ 40 Vac, 30 VA running @ 24 Vac
Electrical Connections: 1/4 in. quick-connect male terminals Voltage: 20 to 30 Vac
Frequency: 50 Hz; 60 Hz
Power Consumption: 12 VA at 24 Vac, 50/60 Hz (max).
Operating Temperature Range: 40 F to 90 F (4 C to 32 C) Setpoint Temperature Range: 40 F to 90 F (4 C to 32 C) Shipping Temperature Range: -40 F to +150 F (-40 C to +65 C)
Accessories:
S963B1037-Manual Potentiometer (480 ohm) S963B1078-Manual Potentiometer (500 ohm) S963B1128-Manual Potentiometer (135 ohm)
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Application |
Control |
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Product Number |
Application |
Size |
System |
Output Type |
Description |
Comments |
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W7100A1053/U |
Discharge Air |
0 Heat / 6 Cool |
W7100 family |
Staged On/Off |
20 to 30 Vac Discharge air |
Additional stages of heating and |
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temperature controller |
cooling can be achieved by adding |
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a W7101 Satellite Sequencer |
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W7100C1018/U |
Discharge Air |
2 Heat / 4 Cool |
W7100 family |
Staged On/Off |
20 to 30 Vac Discharge air |
Additional stages of heating and |
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temperature controller |
cooling can be achieved by adding |
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a W7101 Satellite Sequencer |
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336 |
customer.honeywell.com |
70-6910 |
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