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Honeywell T991A User Manual

Honeywell T991A
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Honeywell T991A Specifications

General IconGeneral
DifferentialAdjustable
Control SignalOn/Off
Control TypeOn/Off
Accuracy±1 °F
Power Supply24 VAC
Sensor TypeThermistor
Output TypeRelay
Input TypeNTC Thermistor
ApplicationHeating and Cooling Systems

Summary

Specifications

Temperature Ranges and Limits

Details operating temperature limits for controller and bulb across various ranges.

Proportioning Range

Specifies the adjustable range for proportional temperature control.

Capillary Length and Material

Lists available capillary tubing lengths and materials for sensing elements.

Accessories

Details optional accessories for installation and integration with the controller.

Optional Specifications

Lists available optional features and variations for the controller models.

Ordering Information

Installation

Location

Guidelines for selecting a suitable mounting location for the controller.

Mounting the Controller Case

Instructions for securely attaching the controller unit to a surface.

Install Sensing Bulb in Air Duct

Procedure for installing the sensing bulb for optimal air temperature detection.

Install Fast Response Model

Specific instructions for installing the fast response sensing coil.

Wiring

Adjustments and Checkout

Temperature Setting

Procedure for setting the desired temperature point on the controller.

Range Adjustment

How to adjust the proportional range for desired control action.

Checkout Procedure

Steps to verify system stabilization and controller performance.

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