Honeywell T7984 A Product Data
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Honeywell T7984 A Product Data

Electronic modulating control thermostats
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T7984 A,B,C Electronic Modulating Control
Thermostats

APPLICATION

These microprocessor-based thermostats provide
proportional - integral (PI) individual room temperature control
in zoned commercial Heating, Ventilating, and Air
Conditioning systems such as hydronic heating and/ or
cooling, pressure dependent VAV or by-pass box with or
without terminal reheat.
The T7984 family provides modulating analog 2 to 10 Vdc
control. Optional features include automatic heat/ cool
changeover, reheat control, remote night setback with local
timed override, and remote sensor on VAV models.

FEATURES

• PI (proportional and integral) control action provides
accurate, stable room temperature control.
• T7984 models are used with Series 70 direct-coupled
damper actuators such as ML7161 or ML7984, or with
valve actuators such as ML7285, ML7421, VC7930 or
M7410.
• All models feature user-friendly set point knob.
• All models feature output status LEDs for installer
check-out.
• Locking cover and range stops are standard.
• Night setback models feature selection of two different
offset temperatures and use central time switch
control.
• Night setback models feature 2 1/2 hour local timed
override.
• Heat/cool models feature automatic changeover with
3° or 5°F (1.5°C or 3°C) selectable Zero Energy Band
(Z.E.B.) to meet requirements of ASHRAE 90.1
• Heat/cool models have installer-definable setpoint at
midpoint of Z.E.B, at heating setpoint, or at cooling
setpoint.
• Reheat models feature fast/slow response selection to
match heating system dynamics.
• DIP switch selectable 75°F (24°C) high limit heating
setpoint and low limit cooling setpoint.
• Horizontal and vertical covers included.
Application.........................................................................
Features ............................................................................
Specifications ....................................................................
Ordering Information .........................................................
Installation .........................................................................
T7984A..............................................................................
T7984B..............................................................................
T7984C..............................................................................
Checkout ...........................................................................
PRODUCT DATA
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95C-10815-2

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Summary of Contents for Honeywell T7984 A

  • Page 1: Table Of Contents

    T7984 A,B,C Electronic Modulating Control Thermostats PRODUCT DATA FEATURES • PI (proportional and integral) control action provides accurate, stable room temperature control. • T7984 models are used with Series 70 direct-coupled damper actuators such as ML7161 or ML7984, or with valve actuators such as ML7285, ML7421, VC7930 or M7410.

  • Page 2: Specifications

    If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care...

  • Page 3: Installation

    T7984 A,B,C ELECTRONIC MODULATING CONTROL THERMOSTATS CAUTION Table 2. Option Settings Disconnect power supply to prevent electrical T7984 Model shock or equipment damage. Parameter Selection Reheat Time Fast (7.5 min.); or Normal • Wiring Typical wiring connections are shown in Fig.2 to Fig.7. Wiring Constant (15 min.)

  • Page 4: T7984A

    T7984 A,B,C ELECTRONIC MODULATING CONTROL THERMOSTATS T7984A Output 1 analog Output 2 Mode input Changeover input Day/Night Remote sensor 75°F setpoint 2œ10V on/off jumper for Out 1 mode (NSB) option limit Cooling and/or heating WIRING To install a remote duct or room temperature sensor, adust DIP the screw terminals and wire as shown.

  • Page 5: T7984B

    T7984 A,B,C ELECTRONIC MODULATING CONTROL THERMOSTATS T7984B Output 1 analog Output 2 Mode input Changeover input Day/Night Remote sensor 75°F setpoint 2œ10V on/off jumper for Out 1 mode (NSB) option limit Cooling Heating Mode A (Jumper out) Heating Cooling Mode B (Jumper in)

  • Page 6: T7984C

    T7984 A,B,C ELECTRONIC MODULATING CONTROL THERMOSTATS T7984C Output 1 analog Output 2 Mode input Changeover input Day/Night Remote sensor 75°F setpoint 2œ10V analog 2œ10V jumper for Out 1 mode (NSB) option limit Cooling and Heating only Heating WIRING To install a remote duct or room temperature sensor, adust DIP the screw terminals and wire as shown.
  • Page 7 T7984 A,B,C ELECTRONIC MODULATING CONTROL THERMOSTATS Output 1, Modulating Analog Output 2 to Zero Energy Band (T7984B & C) 10Vdc (T7984 All) Thermostats which have cooling and heating outputs (T7984B & C) have 2 distinct setpoints, one for heating the other for Main output of the thermostat.

  • Page 8: Checkout

    T7984 A,B,C ELECTRONIC MODULATING CONTROL THERMOSTATS CHECKOUT Output 2 On/Off (T7984B only) A 24 Vac on/off output which is normally used to control terminal reheat in a zoned system. Example: electric base board relay, Service LED electric duct heater relay, perimeter on/off 24 Vac valve, etc.

This manual is also suitable for:

T7984 bT7984 c

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