Honeywell Emm 3 Manual

PRODUCT DATA
68-3041-2
® U.S. Registered Trademark
Copyright © 2002 Honeywell •  All Rights Reserved 
EMM-3
Electronic MiniZone™ Panel
APPLICATION
The EMM-3 Electronic MiniZone™ Panel controls single-
stage heat/cool equipment and is used on two-and three-zone 
applications.
FEATURES
• Uses any Honeywell four-wire thermostat.
• Optional C7735 Discharge Air Temperature Sensor 
Sensor for capacity control.
• SYSTEM and ZONE damper status LEDs indicate 
system status.
• Automatic zone changeover with...

EMM-3 ELECTRONIC MINIZONE™ PANEL
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ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the 
TRADELINE® Catalog or price sheets for complete ordering number.
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 Home and Building Control Sales Office (check white pages of your phone directory).
2.Home and Building...

EMM-3 ELECTRONIC MINIZONE™ PANEL
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Dampers:
Power-open/power-closed.
Spring-open/power-closed.
Spring-closed/power-open.
See Table 2 for recommended dampers.Accessories: For required accessories, see Table 3.
Table 1. Recommended Thermostats.
Logo Standard ThermostatsProgrammable 
Thermostats
Honeywell T87F1859 and Q539A1014
T87F3855 and Q539A1469
T8400C1024
T8401C1015
T8501D1046T8000C1002
T8001C1001
T8600D2069
T8601D2019
T8602D2018
PC8900A1007 
and
W8900A1004
Trol-A-Temp — T8601D2027
Table 2....

EMM-3 ELECTRONIC MINIZONE™ PANEL
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INSTALLATION
Mounting
CAUTION
Equipment Damage Hazard.
Do not mount EMM-3 inside HVAC equipment.
Mount only on wall or on cold air return.
1.Mount the thermostats in each zone of the living space 
using the installation instructions provided with each 
thermostat. See Fig. 2.
2.Mount the dampers in the ductwork using the installa-
tion instructions provided with each damper.
3.Mount the EMM-3 zone panel near the HVAC equip-
ment; locate it on a wall or on the...

EMM-3 ELECTRONIC MINIZONE™ PANEL
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(1) Zone 3 damper is open. Zone 3 LED on EMM-3 
is green.
(2) Zone 1 and 2 dampers are closed. Zone 1 and 2 
LED on EMM-3 are off.
(3) Heating equipment is activated. SYSTEM LED is 
red.
(4) Continue wiring the system.
CAUTION
Voltage Hazard. 
Can cause electrical shock or equipment damage.
Disconnect power before continuing installation.
13.Reconnect power to EMM-3.
14.Continue troubleshooting system in Cool mode.
a. Set Zone 1 thermostat to Cool mode and...

EMM-3 ELECTRONIC MINIZONE™ PANEL
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Fig. 3. EMM-3 system wiring diagram.
Fig. 4. EMM-3 oil heating, electrical 
cooling wiring diagram.
Fig. 5. Two-transformer system wiring diagram.
Fig. 6. Single transformer system wiring diagram.
ZONE
THERMOSTATS
ZONE DAMPER MOTORS
M1 - common
M4 - power open
M6 - power closed
24 Volt Equipment
Transformer(s)
MOMENTARY PUSHBUTTON SWITCHES:
  BOOT  USE THIS SWITCH TO CLEAR THE SYSTEM
   AND CLEAR THE MICROPROCESSOR.
  PURGE OVERRIDE  USE THIS SWITCH TO BYPASS...

EMM-3 ELECTRONIC MINIZONE™ PANEL
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STARTUP AND CHECKOUT
After the installation is complete, check to be sure the system is working properly. See Table 4 for sequence of operation.
Table 4. Trol-A-Temp Electronic MiniZone Panel Sequence Of Operation.
LED DeviceTerminals 
Energized System Action Comments
INITIAL POWERUP
SYSTEM  
(orange)Panel G (fan) System enters Purge mode for 2-1/2 minutes.
Damper(s) open to all zones.See Purge mode.
Damper M4
IDLE MODE
SYSTEM 
(off)Panel None No call for...

EMM-3 ELECTRONIC MINIZONE™ PANEL
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ZONE 1 CALLS FOR FAN
Zone 1 
(green).
Zones 2 and 
3 (off).
SYSTEM  
(off).Thermostat G (fan) System fan is energized.
Zone 1 damper(s) remains open; all others 
close.When a call for cool is made, panel 
adjusts dampers and activates 
equipment as directed.
When a call for heat is made, fan 
stays energized for two minutes 
of heat call.
When fan call ends, Idle mode is 
entered. Damper Zone 1: M4.
Zones 2 and 
3: M6.
Panel G (fan)
DATS TEMPERATURE EXCEEDS...

EMM-3 ELECTRONIC MINIZONE™ PANEL
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SERVICE
Purge timing— fixed at two and one-half minutes; not field-
adjustable.
Fan operation in Purge mode—fan is on in Purge mode; not 
field adjustable.DATS Operation—High limit is 160° F (71°C); low limit is 44°F 
(6°C) and not field-adjustable.
TROUBLESHOOTING
The primary diagnostic tools are the SYSTEM and ZONE 
damper status LED and the BOOT and PURGE OVERRIDE 
buttons. See Fig. 7 and 8 for troubleshooting flowcharts.
Fig. 7. Thermostat is calling for...

EMM-3 ELECTRONIC MINIZONE™ PANEL
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Fig. 8. Thermostat is calling for heating but the system light is not turning red to show a heat call.
NO
START
NO
YES
DO
YOU HAVE 
24 VAC ON ALL OF 
THE ZONES AT 
R-M1 OR R-C
?NO CHECK THE TRANSFORMER
FOR 24 VAC.
MAKE SURE THERMOSTAT IS CALLING FOR HEAT.
THE PANEL MAY HAVE BEEN DAMAGED. 
TAKE THE R OR C WIRE OFF AGAIN FOR 10 
MINUTES. AFTER 10 MINUTES, RE-ATTACH 
THE R OR C WIRE AND PRESS THE BOOT 
BUTTON. CHECK VOLTAGE AT R-M1 OR R-C 
ON ALL THE ZONES. IF...