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Table Of Contents

CONTROLS INC.

Excellence Without Compromise

WARNING: THESE PANELS ARE DESIGNED

FOR USE WITH 24 VOLTS. DO NOT USE

ANY OTHER VOLTAGE! USE CAUTION TO

AVOID ELECTRIC SHOCK OR

EQUIPMENT

SPECIFICATIONS

Power Requirements:

24V 60Hz 40VA

Wiring Connections:

Screw Terminal blocks

for Thermostat gauge wire connections.

Mounting:

Mounts with 4 screws and

mollies (included).

Panel Dimensions:

Length: 10” (254mm);

Width:

9 7/8" (251mm); Depth: 1 9/16” (40mm).

EWC Controls Inc. • 385 Highway 33 • Englishtown, NJ 07726 • 800-446-3110 • FAX

TABLE OF CONTENTS

PAGE

Introduction & Specifications

Application Notes

Typical 5 zone control panel diagram

Thermostat Requirements

Checkout Procedures

EWC-ST-3E Wiring Diagram

EWC-ST-2E

Models EWC-ST-2E & EWC-ST-3E

T E C H N I C A L B U L L E T I N

Model EWC-ST-2E

ZONE2

T’STAT

ZONE1

T’STAT

ADDITIONAL

ZONE PANEL

CAUTION

PLEASE read all

instructions carefully

before starting the

installation

procedures.

SYSTEM

24VAC

T’FORMER

ZONE2

MOTOR

ZONE1

MOTOR

SW1

SW2

OPEN

EWC

CONTROLS INC.

Englishtown, NJ

ULTRA-ZONE

CONTROL SYSTEM

CB1

Congratulations on purchasing the ST2E/ST3E series

ULTRA-ZONE Control Panel. The ST series of zone control

panels are still the same popular, field proven zone control

panels that have been in use for the last seventeen years! The

new “E” series revision has a few upgrades to enhance the

reliability , prote cti on and operati on of th e board.

First and most important is the replacement of the old 3 amp

slo-blo fuse, with an integrated Thermal Circuit breaker or

Polyfuse. This means no more running to the electronics store

to buy a fuse, after the spare fuse that was provided has blown.

The Polyfuse protects the panel against shorts in the thermostat

or damper field wiring. It does not protect against shorts in the

H V A C equi pm ent f i el d w i r i ng. S ee page 2.

The location of the J1 jumper on the panel has also changed, and

there is now an arrow pointing to it. The J1 jumper enables

fan operation in Heat mode as well as Cooling mode.

With the exception of the Polyfuse and the J1 jumper, all

other changes have no direct bearing on the wiring,

i n s t a l l a t i o n , o r o p e r a t i o n o f t h e c o n t r o l p a n e l .

The ST series zone control panels are the most versatile

and rugged relay based logic control systems in use today.

The Master/Slave circuitry of these panels can be utilized

to satisfy numerous control applications and job specifications.

The heating/cooling changeover operation is still controlled by a

changeover subbase on the zone 1 thermostat, or a separate

remote selector switch can be used instead. This allows

for inexpensive standard 2 or 3 wire thermostats to be used in all

z o n e s d e p e n d i n g o n t h e f i e l d a p p l i c a t i o n .

The table on Page 6 shows the types of digital programmable

thermostats t hat a re c ompatible w ith t he S T2E o r S T3E p anels.

The diagrams included with this bulletin are based upon the

most frequently asked questions regarding the wiring of these

panels. There are additional diagrams available through the

Te ch n i ca l S u p p o r t H o t l i n e @ 1 - 8 0 0 - 5 2 6 - 4 0 4 8 .

Contact the Hotline if you find yourself on the job site and

unsure of the exact wiring for your ST Series Control Panel.

DAMAGE

732-446-5362

P/N: 090375A0115

Summary of content (8 pages)

PAGE 1
Excellence Without Compromise TECH N I CAL B U L L ETI N Models EWC-ST-2E & EWC-ST-3E CONTROLS INC. Congratulations on purchasing the ST2E/ST3E series ULTRA-ZONE Control Panel. The ST series of zone control panels are still the same popular, field proven zone control panels that have been in use for the last seventeen years! The new “E” series revision has a few upgrades to enhance the reliability, prote cti on and operati on of th e board.
PAGE 2
OPERATION WIRING 1. HEAT MODE: To operate the system in the heat mode, the "B" terminal has to be made to the "R1" terminal on the zone 1 terminal block. This allows any zone thermostat to call for heat. When a zone calls for heat, the control panel closes the circuit from "R" to "W" activating the furnace. The zone damper calling for heat remains open and zones satisfied will close. The fan and limit control in the furnace will operate the fan. 2.
PAGE 3
#4: TYPICAL TANDEM DAMPER WIRING #3: EWC-ST-2E WITH MCS-DXB REMOTE SELECTOR SWITCH Model 6 Panel ZONE 2 THERMOSTAT W K6 R Y B O K5 4 1 G ZONE 2 T'STAT C W Y R 6 4 1 ZONE 1 THERMOSTAT ZONE 1 T'STAT C W Y R W R Y B O CAUTION PLEASE read all instructions carefully before starting the installation procedures. RED BROWN SW2 ZONE1 MOTOR M6 M4 M2 M1 24V T'FORMER 2 SW1 OPEN K2 CLOSE OPEN K1 CLOSE K4 CB1 1 K8 RED ORANGE HEAT COOL OFF 40 - 60VA RATING MAX.
PAGE 4
#6: TYPICAL FAN CENTER AND OIL BURNER WITH ISOLATION RELAY #7: TYPICAL GAS FURNACE Model Model K5 OUTDOOR CONDENSING UNIT ZONE2 MOTOR M6 M4 M2 M1 SW2 ZONE1 MOTOR M6 M4 M2 M1 24V T'FORMER 2 SW1 K5 OPEN OUTDOOR CONDENSING UNIT K2 CLOSE ZONE2 MOTOR M6 M4 M2 M1 SW2 ZONE1 MOTOR M6 M4 M2 M1 24V T'FORMER 2 SW1 OPEN K2 CLOSE Y Y C FAN CENTER C Y C OPEN K1 GAS FURNACE CLOSE C Y W K4 G R CB1 1 G R OPEN K1 CLOSE K4 CB1 1 K8 B O X Y W G R ISOLATION RELAY K8 B O X Y W G R K9
PAGE 5
#10: WIRING DIAGRAM INTERCONNECTION OF TWO PANELS FOR ADDITIONAL ZONES MASTER PANEL DAMPER MOTORS 6 4 1 Model ZONE3 MOTOR M6 M4 M2 M1 K3 Z3 D15 C3 D16 D14 CLOSE SW2 D17 Z6 C5 C6 K2 CLOSE D11 Z2 D12 C2 D10 W C W Y R 6 4 1 TRANSFORMER OPEN K1 Z1 D3 C1 D4 ZONE-1 T'STAT D2 K4 D5 Z4 Z7 C4 C7 W G R C Z8 C8 B O X Y W G R D22 D20 D19 D24 K9 Z9 D23 C9 D25 D26 CONTROLS INC.
PAGE 6
TH ERMO STAT REQ UIR EMENTS ZONE 2 THERMOSTAT – MODEL EWT-3611 C R6 C6 K6 + D11 D12 D10 W Y R RC/O RH/B G ZONE 2 T'STAT C W Y R ZONE 1 THERMOSTAT – MODEL EWT-3611 D9 ZONE 1 T'STAT C W Y R D3 D4 D6 D5 C W Y R RC/O RH/B G K7 R7 C7 + D21 D22 CAUTION R1 0 B G D20 D19 ZONE 1 6 WIRES REQUIRED DIGITAL NONPROGRAMMABLE THERMOSTATS (Battery Operated) SUPPLIER EWC CONTROLS® WHITE ® RODGERS DIGITAL PROGRAMMABLE THERMOSTATS (Battery Operated) EWT - 3611 EWT - 3707 1F78-144 1F80-261 R
PAGE 7
CH ECK OU T PR OC EDUR E #11: THERMOSTAT CIRCUIT HEATING MODE D15 D16 D18 D17 R6 C6 COOLING OFF MODE MODE ZONE 3 T'STAT C W Y R K6 ZONE 2 T'STAT C W Y R + D11 D12 D10 D9 ZONE 1 T'STAT C W Y R D3 D4 D6 D5 K7 R7 C7 + R1 0 B G D21 D22 D20 D19 D24 CAUTION PLEASE read all instructions carefully before starting the installation procedures.
PAGE 8
#14: WIRING DIAGRAM MODEL EWC-ST-3E CONTROL PANEL DAMPER MOTORS 6 4 1 K3 6 Z3 D15 C3 D16 OPEN ZONE-3 T'STAT C D14 CLOSE D17 D13 ZONE2 MOTOR M6 M4 M2 M1 SW2 ZONE1 MOTOR M6 M4 M2 M1 24V T'FORMER 2 SW1 Z5 Z6 C5 C6 K6 CLOSE D7 D11 Z2 D12 C2 D10 C D9 6 4 1 24VAC TRANSFORMER K1 Z1 D3 C1 D4 D2 C W Y R D5 Z4 Z7 C4 C7 K7 CB1 1 Y W G R C R1 O B G D21 Z8 K8 HVAC EQUIPMENT C D1 K4 C8 B O X Y W G R D22 CAUTION D20 D19 D24 K9 Z9 D23 C9 D25 D26 CONTROLS IN