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 20-minute 
changeover timer.
• Individual zone fan control.
• Thermal circuit breaker protects panel and transformer 
from damage if miswired.
• Purge timer protects equipment between calls for 
heating and cooling.
• Uses spring-open/power-closed, spring-closed/power-
open, and power-open/power-closed dampers.
• Interfaces with single or dual transformer equipment.
For Internet access:
www.honeywell.com/yourhome/zoning/zoning_home.htm
For technical support: call 1-800-828-8367.
To download Zoning literature:
http://hbctechlit.honeywell.com
Contents
Application ......................................................................... 1
Features ............................................................................ 1
Specifications .................................................................... 2
Ordering Information ......................................................... 2
Installation ......................................................................... 4
Startup and Checkout ........................................................ 7
Service .............................................................................. 9
Troubleshooting ................................................................. 9 
						

							EMM-3 ELECTRONIC MINIZONE™ PANEL
698-3041-2 2
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 Control Customer Relations
Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, 
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
SPECIFICATIONS
Input Ratings: DIscharge Air Temperature Sensor (DATS): 
24000 to 1600 ohms.
Output Ratings:
Equipment Relays and Zone Relays:
1.5A run, 3.5A inrush, 200,000 cycles (30 Vac).
1.5A run, 7.5A inrush, 100,000 cycles (30 Vac).
Humidity Ratings:  5% to 90% RH non-condensing. 
Temperature Ratings:
Shipping: -20° to 120°F.
Operating: -40° to 150°F.
LED:
SYSTEM LED: Used to communicate equipment status:
Red: Heat mode.
Green: Cool mode.
Orange: Purge mode.
Flashing Red: System exceeds high DATS input.
Flashing Green: System exceeds low DATS input.
Flashing Orange: No DATS or DATS failure.
Off: Idle mode or Fan mode.
ZONE LED (3): Used to communicate damper status:
Green: Dampers are opening or open.
No Color: Dampers are closing or closed.
Finish: White.
Dimensions: See Fig. 1.
Mounting: Mounting screws provided.Wiring: 18 gauge wire for all equipment and system connec-
tions.
Wiring Connections:
Thermostat: R-C-W-Y-G.
Dampers: M6 (Closed); M4 (Open); M1 (Common).
Discharge AIr Temperature Sensor: ZMS-ZMS.
Transformer: R-C.
Equipment: RC-RH-Y-W-G.
Fig. 1. EMM-3 dimensions in in. (mm).
Approvals:
Federal Communications Commission: Class B.
NEMA DC-3: Not required.
Thermostats:
Any Honeywell four-wire thermostat.
M20867
10-3/4
(273)
12-3/4
(273)
1-7/8
(47)
SYSTEM ZONE1 ZONE 2 ZONE 3 
						

							EMM-3 ELECTRONIC MINIZONE™ PANEL
3 68-3041-2
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. Recommended Dampers.
Honeywell Damper Type Round Rectangular
Power-open/power closed MARD D643 using 
ML6161 Motor 
Actuator
Spring-open/power-closed ARD ZD
Table 3. Required Accessories.
Accessory Description
40 VA transformer AT140D1046
Capacity protector DATS C7735A1000
Round static pressure 
regulator damper7   SPRD
8   SPRD
9   SPRD
10 SPRD
12 SPRD
14 SPRD
16 SPRD 300  cfm
 400  cfm
 600  cfm
 750  cfm
1200 cfm
1800 cfm
2400 cfm
Rectangular static 
pressure regulator 
damper12 x 8   SPRD
12 x 10 SPRD
12 x 12 SPRD
20 x 8   SPRD
20 x 10 SPRD
20 x 12 SPRD1000 cfm
1200 cfm
1400 cfm
1600 cfm
2000 cfm
3000 cfm 
						

							EMM-3 ELECTRONIC MINIZONE™ PANEL
68-3041-2 4
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 cold-air return. 
4.Level the EMM-3 for appearance only.
Fig. 2. EMM-3 mounting location.
Wiring
Wiring must comply with applicable codes, ordinances, and 
regulations.
See Fig. 3-6 for wiring diagrams.
CAUTION
Voltage Hazard. 
Can cause electrical shock or equipment damage.
Disconnect power before beginning installation.
1.Connect 24 Vac transformer to R and C terminals on 
EMM-3.
2.Connect HVAC equipment to R
C,RH,W,Y and G termi-
nals on EMM-3. (Use jumper between R
C and RH if 
using single equipment transformer.)
3.Connect the dampers for zone 1, 2 and 3 to EMM-3. 
See instructions packed with dampers.4.Connect the zone 1 thermostat to EMM-3.
5.Reconnect power to EMM-3.
6.Check out connections made in steps 1 through 5:
a. If system is in Purge mode, press PURGE OVER-
RIDE on EMM-3.
b. Set Zone 1 thermostat to call for heat:
(1) Zone 1 damper is open. Zone 1 LED on EMM-3 
is green.
(2) Zones 2 and 3 dampers are closed. Zones 2 and 
3 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.
7.Connect Zone 2 thermostat to EMM-3.
8.Reconnect power to EMM-3.
9.Check out connections made in steps 1 through 8:
a. If system is in Purge mode, press PURGE OVER-
RIDE on EMM-3.
b. Set Zone 2 thermostat to call for heat, set Zone 1 
thermostat to off:
(1) Zone 2 damper is open. Zone 2 LED on EMM-3 
is green.
(2) Zones 1 and 3 dampers are closed. Zones 1 and 
3 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.
10.Connect zone three thermostat to EMM-3.
11 .Reconnect power to EMM-3.
12.Check out connections made in steps 1 through 11:
a. If system is in Purge mode, press PURGE OVER-
RIDE on EMM-3.
b. Set Zones 1 and 2 thermostats to Off.
c. Set Zone 3 thermostat to call for heat.
M13540
WATER 
HEATEREMM-3E
LE
CTR
ONIC
 A
IR 
CLEA
N
ER
RETURNAIR
EMM-3
OPTIONAL
LOCATION
FURNACE 
OR BOILER
HIGH
 EFFICIENCY
AIR CLEANER
System Zone 1 Zone 2 Zone 3
LEDRed Green Off Off
System 
OperationHeat on Open Closed Closed
System Zone 1 Zone 2 Zone 3
LEDRed Off Green Off
System 
OperationHeat on Closed  Open Closed 
						

							EMM-3 ELECTRONIC MINIZONE™ PANEL
5 68-3041-2
(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 Zones 2 
and 3 thermostats to off.
b. Zone 1 damper is open. Zone 1 LED on EMM-3 is 
green.
c. Zones 1 and 3 dampers are closed. Zones 2 and 3 
LED on EMM-3 are off.
d. Cooling equipment is activated. SYSTEM LED is 
green.
e. Repeat procedure for zones 2 and 3. Continue wir-
ing the system.
CAUTION
Voltage Hazard. 
Can cause electrical shock or equipment damage.
Disconnect power before continuing installation.
15.Reconnect power to EMM-3
16.Check out fan operation.
a. Set Zone 1 thermostat fan switch to On, and Zones 
2 and 3 thermostats to Auto.
b. Zone 1 damper is open. Zone 1 LED on EMM-3 is 
green.
c. Zones 2 and 3 dampers are closed. Zones 2 and 3 
LED on EMM-3 are off.
d. Fan equipment is activated. SYSTEM LED is off.
e. Repeat procedure for zones 2 and 3. Continue wir-
ing the system.
CAUTION
Voltage Hazard. 
Can cause electrical shock or equipment damage.
Disconnect power before continuing installation.
17.Connect DATS Sensor to EMM-3 (optional).
a. Reconnect power to EMM-3.
b. If system is in Purge mode, press PURGE OVER-
RIDE on EMM-3.
c. Verify SYSTEM LED is no longer flashing. This con-
firms proper DATS operation. (Flashing occurs in 
Idle and Fan modes only.) System Zone 1 Zone 2 Zone 3
LEDRed Off Off Green
System 
OperationHeat on Closed Closed Open
System Zone 1 Zone 2 Zone 3
LEDGreen Green Off Off 
System 
OperationCool on Open Closed Closed
System Zone 1 Zone 2 Zone 3
LEDOff Green Off Off 
System 
OperationFan on Open Closed Closed 
						

							EMM-3 ELECTRONIC MINIZONE™ PANEL
68-3041-2 6
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 THE PURGE
    CYCLE WHILE TROUBLESHOOTING THE SYSTEM.
LED STATES:
 SYSTEM LED
  RED  HEATING MODE
  GREEN  COOLING MODE
  ORANGE  PURGE MODE
    FLASHING RED  ZMS SENSOR EXCEEDS HIGH LIMIT IN HEATING
    FLASHING GREEN  ZMS SENSOR EXCEEDS LOW LIMIT IN COOLING
    FLASHING ORANGE  NO ZoneMAX SENSOR INSTALLED
      OR ZoneMAX SENSOR FAILURE
  DAMPER STATUS LEDS
    ON (GREEN COLOR)  DAMPER IS OPEN OR OPENING
    OFF (NO COLOR)  DAMPER IS CLOSED OR CLOSING R
HRCY
W
G
BOOT PURGE
OVERRIDE
Single Transformer 
Heating/Cooling systems
require a jumper to be installed
between R
H and RC(factory installed).
*  C terminal connection is not
  required on battery powered,
  power stealing, or some
 electromechanical thermostats. EQUIPMENTDischarge Ai
rTemperature
Sensor
(See C7735
Installation Instructions
for further information.)
ZONEMAX
R
C ZMS
ZMS
Heating Transformer
Cooling Transformer
Cool Relay
Heat Relay
Fan Relay
This diagram shows the typical single
stage equipment, thermostat, and
damper motor connections.  For specific
wiring for other thermostats, damper
motors, and HVAC Equipment,
refer to the Installation Instructions.R Y W G C M6M4M1
RYW
G
456Z
123XC
*
Zone 1 Thermostat
Power-open
Power-closed
(Opposed Blade
ZONE 1R Y W G C M6M4M1
R
YCR
WG C
*
Zone 2 Thermostat
Power-closed
Spring-open
(Model ZD)
ZONE 2RYWGCM6M4M1
RYWGC
*
Zone 3 Thermostat
Power-closed
Spring-open
(Model ARD)
ZONE 3
24 Volt 40VA 
Transformer 24VAC
40VA
ZONE PANEL
TRANSFORMER
SYSTEM
LED
ZONE 1 ZONE 2
DAMPER STATUS LEDS
ZONE 3
TT
24V OIL PRIMARY
PANEL
R
H
RC
Y
W
G
FAN
RELAY
COOLING
CONTACTOR
M13537REMOVE FACTORY INSTALLED RH TO RC JUMPER.11
L1
(HOT)
L2
L1
(HOT)
L2
COOLING
TRANSFORMER HEATING
TRANSFORMER
PANEL
R
H
RC
Y
W
G
M13538REMOVE FACTORY INSTALLED RH TO RC JUMPER.11
L1
(HOT)
L2
HEAT
RELAY L1
(HOT)L2
FAN
RELAY
COOLING
CONTACTOR
TRANSFORMERPANEL
R
H
RC
Y
W
G
INSTALL JUMPER BETWEEN RH AND RC.1
1
HEAT
RELAY L1
(HOT)
L2COOLING
CONTACTOR
FAN
RELAY 
						

							EMM-3 ELECTRONIC MINIZONE™ PANEL
7 68-3041-2
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 heating or cooling. Equipment terminals are not 
energized.
If SYSTEM LED flashes orange, 
DATS is not connected or is out-
of-range.
PURGE MODE
ZONE 
(orange)Thermostat None Damper from last zone to call remains open; all 
others remain closed for 2-1/2 minutes after 
thermostat call ends.
After 2-1/2 minutes, if no other call for heating or 
cooling is required, all dampers open.Panel enters Purge mode after 
each call for heat and cool; this 
allows heat exchanger to 
dissipate more conditioned air 
into the zone. Damper M4
Panel G (fan)
ZONE 1 INITIATES CALL FOR HEAT
SYSTEM 
(red)
Zone 1 
(green).Thermostat W (heat) Zone 1 thermostat calls for heat.
Zone 1 damper(s) remains open.
Zones 2 and 3 dampers close.
Panel calls for heat.Heat is delivered only in zone 1.
When another zone calls for heat 
while zone 1 is calling, that zone 
damper opens.
For electric heat applications, use 
thermostat that calls for fan with 
all calls for heat. Damper Zone1: M4
Zones 2 and 
3: M6
Panel W (heat)
ZONE 1 ENDS CALL FOR HEAT
SYSTEM 
(orange)Thermostat None System enters Purge mode.
Damper(s) from zone 1 remains open; all others 
remain closed for 2-1/2 minutes after zone 1 
thermostat call ends.
After 2-1/2 minutes, all dampers open (M4 
energized).None.
Damper Zone 1: M4.
Zones 2 and 
3: M6.
Panel G (fan)
ZONE 1 INITIATES CALL FOR COOL
SYSTEM 
(green).
Zone 1 
(green).Thermostat Y (cool)
G (fan)Zone 1 thermostat calls for cool and fan.
Zone 1 damper(s) remains open.
Zones 2 and 3 dampers close.
Panel calls for cool and fan.Cool is delivered only to zone 1.
If another zone calls for cool while 
zone 1 is calling, the damper to 
that zone opens.
In retrofit applications, where only 
three wires are available, Y 
signal from thermostat activates 
Y and G call from panel Damper Zone 1: M4.
Zones 2 and 
3: M6.
Panel Y (cool).
G (fan).
ZONE 1 ENDS CALL FOR COOL
SYSTEM 
(orange)Thermostat None System enters Purge mode.
Damper(s) from zone 1 remains open; all others 
remain closed for 2-1/2 minutes after zone 1 
thermostat call ends.
After 2-1/2 minutes, all dampers open (M4 
energized).None.
Damper Zone 1: M4.
Zones 2 and 
3: M6.
Panel G (fan) 
						

							EMM-3 ELECTRONIC MINIZONE™ PANEL
68-3041-2 8
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 160° (71°C) IN ZONE 1 CALL FOR HEAT
SYSTEM 
(flashes red)Thermostat W (heat) Thermostat continues to call for heat, but panel 
ignores call.
Damper(s) from zone 1 remains open; all others 
are closed.
Panel activates system fan for 2-1/2 minutes 
and until DATS temperature drops more than 
10°F (-12°C).After 2-1/2 minutes and more than 
10°F (-12°C) temperature drop, 
the panel returns to Heat mode 
(if call still exists), delivering heat 
to zone 1 and any other zone 
calling for heat. Fan stays on first 
two minutes of heat call. Damper Zone 1: M4.
Zones 2 and 
3: M6.
Panel G (fan)
DATS TEMPERATURE FALLS BELOW 44°F (6°C) IN ZONE 1 CALL FOR COOL
SYSTEM 
(flashes 
green)Thermostat Y (cool)
G (fan)Thermostat continues to call for cool and fan, 
but panel ignores cool call.
Damper(s) from zone 1 remains open; all others 
are closed.
Panel activates system fan for 2-1/2 minutes 
and until DATS temperature rises more than 
10°F (-12°C).After 2-1/2 minutes and more than 
10°F (-12°C) temperature rise, 
the panel returns to Cool mode 
(if call still exists), delivering 
cooling to zone 1 and any other 
zone calling for cool. Damper Zone 1: M4.
Zones 2 and 
3: M6.
Panel G (fan)
AFTER BOOT BUTTON IS PRESSED
SYSTEM 
(orange)Panel G (fan) System enters Purge mode for 2-1/2 minutes.
Dampers to all zones open.See Purge mode.
Dampers M4
PURGE OVERRIDE BUTTON IS PRESSED
None Panel None Panel exits Purge mode after approximately 
2 seconds.
Panel waits for next call for heat, cool or fan 
from zone thermostats.
If no calls exist, panel remains in Idle mode.Used to troubleshoot the system. 
Pressing the button cancels the 
Purge mode and makes 
troubleshooting the system 
quicker and easier.
PANEL RECEIVES SIMULTANEOUS CALLS FOR HEAT AND COOL FROM DIFFERENT ZONES
None Panel None Panel defaults to the last type of call (heat or 
cool) to determine which type of conditioning 
to choose.When the first call for conditioning 
ends, the panel enters the Purge 
mode, then delivers conditioning 
to the other zone(s), as required.
WHILE ZONE 1 CALLS FOR HEAT, ZONE 2 CALLS FOR COOL
None Panel None Panel delivers heat into zone 1 until call is 
satisfied or for a 20- minute delay, whichever 
occurs first.
Panel enters Purge mode.
Panel delivers cool into zone 2 until call is 
satisfied, or for a 20-minute delay, whichever 
occurs first.Prevents one zone from never 
receiving conditioning because it 
is requesting the opposite 
device. Table 4. Trol-A-Temp Electronic MiniZone Panel Sequence Of Operation. (Continued)
LED DeviceTerminals 
Energized System Action Comments 
						

							EMM-3 ELECTRONIC MINIZONE™ PANEL
9 68-3041-2
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 cooling but the system light is not turning green to show a cool call.
NO
START
NO
YES
IS 24 VAC
ON ALL OF THE
ZONES AT R-M1
OR R-C
?NO CHECK THE TRANSFORMER
FOR 24 VAC.
THERMOSTAT MAY BE IN A 5 MIN DELAY IN COOLING. 
MAKE SURE THERMOSTAT IS CALLING FOR COOLING.
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 NO VOLTAGE AT R-M1 
OR R-C, REPLACE THE EMM PANEL.
RE-ATTACH EACH ZONE THERMOSTAT WIRE.
ATTACH EACH ZONE SEPARATELY, CHECKING 
AFTER EACH ZONE IS ATTACHED IF THE 
THERMAL FUSE HAS TRIPPED. AFTER 
ATTACHING THE THERMOSTAT WIRES, ATTACH
EACH MOTOR ZONE WIRES, AGAIN CHECKING 
THE THERMAL FUSE TO SEE IF IT TRIPS. THIS 
STEP-BY-STEP PROCESS SHOULD HELP YOU 
IDENTIFY WHAT IS TRIPPING THE THERMAL 
FUSE ON THE PANEL. YES
YES
IS 24 VAC
AT R AND C
ON THE EMM
PANEL
?
CHECK FOR
24 VAC AT Y-M1 OR Y-C
ON THE EMM PANEL. (YOU 
SHOULD HAVE 
24 VAC.)
IS THE 
THERMOSTAT CALLING 
FOR COOL?
IS THERE
CONTINUITY AT R
C-Y 
ON THE EQUIPMENT 
CONTACTS OF THE 
EMM PANEL?NO
NO
NOTHE 
THERMAL FUSE 
HAS TRIPPED. REMOVE THE 
R OR C (TRANSFORMER POWER) 
WIRE FROM THE PANEL FOR 15 SECONDS 
AND ALLOW THE FUSE TO RESET. TAKE THE 
THERMOSTAT AND DAMPER WIRES OFF FROM
EACH ZONE BEFORE YOU RE-ATTACH 
THE R OR C WIRE. IS THERE 
VOLTAGE AT R-M1 OR R-C
ON ALL OF THE 
ZONES?IS THERE
24 VAC AT Y-C ON THE 
THERMOSTAT?
DO YOU 
HAVE A DATS 
HOOKED TO THE 
PANEL?NO
YES YES
YES
YES
JUMPER THE R WIRE TO THE Y WIRE ON THE
THERMOSTAT. IF THE COOL LIGHT COMES ON, YOU 
HAVE A BAD THERMOSTAT. REPLACE THERMOSTAT.
IF YOU JUMPER R-Y ON THE THERMOSTAT AND 
THE COOL LIGHT DOES NOT COME ON, YOU MAY 
HAVE A BAD WIRE. TRY ANOTHER SET OF WIRES 
OR CHECK CONTINUITY.
IT COULD BE A BAD WIRE. IF YOU HAVE 
VOLTAGE ON THE PANEL AT Y-C BUT NOT AT 
THE THERMOSTAT, THEN IT IS A WIRE. CHECK 
FOR VOLTAGE AT R-W, G ON THE THERMOSTAT. 
IF THERE IS VOLTAGE, IT IS A BAD Y WIRE. 
IF NO VOLTAGE AT R-ANY OTHER TERMINAL 
ON THE THERMOSTAT, IT IS A BAD R WIRE.
YES
NO
THE COOLING EQUIPMENT SHOULD BE ON. 
SEEMS LIKE THE PANEL IS WORKING BUT THE SYSTEM 
LIGHT IS NOT. REPLACE PANEL.
M13543A
DID THE EMM PANEL HAVE ANY CONDENSATION ON IT? 
WAS IT STORED IN A COLD PLACE BEFORE BEING 
INSTALLED? IF SO, THIS COULD CAUSE THE PANEL TO
MALFUNCTION. LET THE PANEL ADAPT TO THE NEW 
CONDITIONS BEFORE POWER UP.
YES
REMOVE THE DATS WIRES FROM THE BOARD. 
RETURN TO “IS THE THERMOSTAT CALLING FOR 
COOL” PART OF THE FLOWCHART AND BEGIN 
TROUBLESHOOTING FROM THAT POINT.
REMOVE ALL WIRES FROM THE PANEL EXCEPT
R AND C (POWER FROM THE TRANSFORMER). 
JUMPER R-Y ON ONE OF THE ZONES. IF THE 
SYSTEM LIGHT DOES NOT TURN GREEN, REPLACE 
THE PANEL.NO 
						

							EMM-3 ELECTRONIC MINIZONE™ PANEL
68-3041-2 10
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 NO VOLTAGE AT R-M1
OR R-C, REPLACE THE EMM PANEL.
RE-ATTACH EACH ZONE THERMOSTAT WIRE.
ATTACH EACH ZONE SEPARATELY, CHECKING 
AFTER EACH ZONE IS ATTACHED IF THE 
THERMAL FUSE HAS TRIPPED. AFTER 
ATTACHING THE THERMOSTAT WIRES, ATTACH
EACH MOTOR ZONE WIRES, AGAIN CHECKING 
THE THERMAL FUSE TO SEE IF IT TRIPS. THIS 
STEP-BY-STEP PROCESS SHOULD HELP YOU 
IDENTIFY WHAT IS TRIPPING THE THERMAL 
FUSE ON THE PANEL. YES
YES
IS THERE 
24 VAC AT THE 
TRANSFORMER R AND C 
ON THE EMM 
PANEL?
CHECK
FOR  24 VAC AT
W-M1 OR W-C ON 
THE EMM PANEL. (YOU 
SHOULD HAVE 
24 VAC.)
IS THE 
THERMOSTAT CALLING 
FOR HEAT?
IS THERE
CONTINUITY AT 
R
H-W ON THE EQUIPMENT 
CONTACTS OF THE 
EMM PANEL?NO
NO
NOTHE 
THERMAL FUSE 
HAS TRIPPED. REMOVE THE 
R OR C (TRANSFORMER POWER) 
WIRE FROM THE PANEL FOR 15 SECONDS 
AND ALLOW THE FUSE TO RESET. TAKE THE 
THERMOSTAT AND DAMPER WIRES OFF FROM
EACH ZONE BEFORE YOU RE-ATTACH 
THE R OR C WIRE. IS THERE 
VOLTAGE AT R-M1 OR 
R-CON ALL OF THE 
ZONES?IS THERE
24 VAC AT W-C ON THE 
THERMOSTAT?
DO YOU 
HAVE A DATS 
HOOKED TO THE 
PANEL?NO
YES YES
YES
YES
JUMPER THE R WIRE TO THE W WIRE ON THE
THERMOSTAT. IF THE HEAT LIGHT COMES ON, YOU 
HAVE A BAD THERMOSTAT. REPLACE THERMOSTAT. 
IF YOU JUMPER R-W ON THE THERMOSTAT AND 
THE HEAT LIGHT DOES NOT COME ON, YOU MAY 
HAVE A BAD WIRE. TRY ANOTHER SET OF WIRES 
OR CHECK CONTINUITY.
IT COULD BE A BAD WIRE. IF YOU HAVE 
VOLTAGE ON THE PANEL AT W-C BUT NOT AT 
THE THERMOSTAT, THEN IT IS A WIRE. CHECK 
FOR VOLTAGE AT R-Y, G ON THE THERMOSTAT. 
IF THERE IS VOLTAGE, IT IS A BAD W WIRE. IF 
NO VOLTAGE AT R-ANY OTHER TERMINAL ON 
THE THERMOSTAT, IT IS A BAD R WIRE.
YES
NO
THE HEATING EQUIPMENT SHOULD BE ON. 
SEEMS LIKE THE PANEL IS WORKING BUT THE SYSTEM 
LIGHT IS NOT. REPLACE PANEL.
M13546A
DID THE EMM PANEL HAVE ANY CONDENSATION ON IT? 
WAS IT STORED IN A COLD PLACE BEFORE BEING 
INSTALLED? IF SO, THIS COULD CAUSE THE PANEL TO
MALFUNCTION. LET THE PANEL ADAPT TO THE NEW 
CONDITIONS BEFORE POWERUP.
YES
REMOVE THE DATS WIRES FROM THE PANEL. 
RETURN TO “IS THE THERMOSTAT CALLING FOR 
HEAT” PART OF THE FLOWCHART AND BEGIN 
TROUBLESHOOTING FROM THAT POINT.
REMOVE ALL WIRES FROM THE PANEL EXCEPT
R AND C (POWER FROM THE TRANSFORMER). 
JUMPER R-W ON ONE OF THE ZONES. IF THE 
SYSTEM LIGHT DOES NOT TURN RED, REPLACE 
THE PANEL.NO