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EMM-3U Universal
Electronic MiniZone™ Panel
PRODUCT DATA

FEATURES
• Compatible with single-stage, multi-stage,
conventional or heat pump applications.
• Uses virtually any Honeywell four-wire, single-stage,
multi-stage, or Trol-A-Temp heat pump thermostat.
• Optional Discharge Air Temperature Sensor for
capacity control with adjustable high and low limits.
• System and Zone 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.

APPLICATION

• Uses spring-open/power-closed, spring-closed/poweropen, and power-open/power-closed dampers.
• Single or dual transformer equipment compatible.

The EMM-3U Universal Electronic MiniZone™ Panel controls
single-stage, multi-stage, conventional or heat pump heat/cool
equipment and is used on two- and three-zone applications.
For Internet access:
www.honeywellzoning.com
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
Troubleshooting ................................................................ 15

® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved

68-0237-2

EMM-3U UNIVERSAL ELECTRONIC MINIZONE™ PANEL

SPECIFICATIONS
Wiring Connections:
Thermostat: R-C-E-W1-Y1-G-W2-Y2-O-B-L.
Dampers: M6 (Closed); M4 (Open); M1 (Common).
Discharge Air Temperature Sensor: DATS-DATS.
Transformer: R-C.
Equipment: RC-RH-W1-W2-E-B-O-Y1-Y2-G.

Input Ratings:
Voltage: 20 - 30 Vac, 50/60 Hz.
Power: 10.75 VA nominal.
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 mode LED (5) used to communicate equipment
status:
Red Heat: Heat mode.
Green Cool: Cool mode.
Yellow Purge: Purge mode.
Green Fan: Fan mode.
Red EM Heat: Emergency Heat mode.
Flashing Red Heat: System exceeds high DATS input.
Flashing Green Cool: System exceeds low DATS input.
Flashing Yellow Purge: No DATS or DATS failure.
Off: Idle mode.
ZONE LED (3) used to communicate damper status:
Green: Dampers are opening or open.
No Color: Dampers are closing or closed.

10-3/4
(273)

12-3/4
(273)

1-7/8
(47)
M20779A

Fig. 1. EMM-3U dimensions in in. (mm).
Approvals:
Federal Communications Commission: Class B.
NEMA DC-3: Not required.

Finish:
Taupe cover.
Gray base.
Dimensions: See Fig. 1.
Mounting: Mounts with four one-inch no. 8 screws (provided)
through holes in cabinet. Wall anchors provided.
Wiring: 18 to 22 gauge wire for all equipment and system
connections.

Thermostats (See Table 1):
Most conventional four-wire (R, W, Y, G) thermostats can be
used to control conventional, heat pump, or multi-stage
equipment.
Manual or automatic changeover switching thermostats can
be used.
Multi-stage or select heat pump thermostats can also be used.

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 (1-800-468-1502):
1.
2.

Your local Automation and Control Solutions Sales Office (check white pages of your phone directory).
Honeywell Automation and Control Solutions Customer Care
1985 Douglas Drive North
Golden Valley, MN 55422
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.

68-0237-2

2

EMM-3U UNIVERSAL ELECTRONIC MINIZONE™ PANEL

Recommended Dampers (See Table 2):
Five ZD or ARD dampers maximum connected to each panel
and a maximum of five dampers per zone.
Use SDCR for additional dampers required on one zone.
Dampers are connected to M1 Common, M4 Open, and M6
Closed (see Fig. 8-12 for hookups).

Table 1. Recommended Thermostats.
System
SingleStage

Heat
Pumpb

MultiStageb

Non-Programmable
T87F1859/Q539A1014
T87F4010/Q539A4026
T8501D1046
T8400C1016
T8400C1040
T8400C1099
T8501D1111

Y594R1243a,c,d
Y594G1252a,e
T8411R1002
T8411R1028
T8424D1008
T8424D1016
T8524D1007
T8524D1015
Y594D1347f
T8524D1015

Programmable
T8601D2027
T8600D2069
T8600D2028
T8601D2019
T8602D2018
T8602D2000
T8000C1002
T8000C1010
T8001C1019
PC8900/W8900A,C

Table 2. Recommended Dampers.
Honeywell Damper Type

Round

Rectangular

Power-open/power closed
(for systems >2000 cfm)

MARD

D642 using
ML6161 Motor
Actuator

Spring-open/power-closed
(for systems 
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