the technical bulletin in acrobat format
TRANSCRIPT
CONTROLS INC.
Excellence Without Compromise
WARNING: THESE PANELS ARE DESIGNEDFOR USE WITH 24 VOLTS. DO NOT USEANY OTHER VOLTAGE! USE CAUTION TOAVOID ELECTRIC SHOCK OR EQUIPMENT
SPECIFICATIONS
Power Requirements: 24V 60Hz 40VA
Wiring Connections: Screw Terminal blocksfor Thermostat gauge wire connections.
Mounting: Mounts with 4 screws andmollies (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
1
2
5
6
7
8
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-2EZONE2T’STAT
ZONE1T’STAT
CWYR
CWYR
R1OBG
ORC+_
ADDITIONALZONE PANEL
CAUTIONPLEASE read allinstructions carefullybefore starting the installation procedures.
J1
SYSTEM
24VACT’FORMER
2
1
ZONE2MOTOR
ZONE1MOTOR
M6M4M2M1
M6M4M2M1
SW1
SW2
OPEN
CLOSE
OPEN
CLOSE
EWC CONTROLS INC.Englishtown, NJ
ULTRA-ZONECONTROL SYSTEM
YWGR
BOX
CB1
Congratulations on purchasing the ST2E/ST3E seriesULTRA-ZONE Control Panel. The ST series of zone controlpanels are still the same popular, field proven zone controlpanels that have been in use for the last seventeen years! The new “E” series revision has a few upgrades to enhance the re l iabi l i ty, protect ion and operat ion of the 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 storeto 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 e q u i p m e n t f i e l d w i r i n g . S e e p a g e 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, allother changes have no direct bearing on the wiring,i n s ta 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 pa n e l .
The ST series zone control panels are the most versatileand 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 separateremote selector switch can be used instead. This allowsfor inexpensive standard 2 or 3 wire thermostats to be used in allz 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 that are compatible with the ST2E or ST3E panels.
The diagrams included with this bulletin are based upon the most frequently asked questions regarding the wiring of thesepanels. There are additional diagrams available through theTe c h n i c a 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 andunsure of the exact wiring for your ST Series Control Panel.
TB 115 Rev. I Copyright © EWC Controls 1999-2009 All Rights Reserved.
DAMAGE
732-446-5362
P/N: 090375A0115
(DISPONIBLE EN ESPAÑOL EN EWCCONTROLS.COM)
ewccontrols.com/acrobat/090375a0248.pdf
rol Panel
CONTROL SYSTEM
K6
K7
R6
R7
C7 +
C6 +
D11
D12
D10
D6
D4
D9
D5
D3
D21
D22
D20
D19
D24
D23
D25
D26
C
W
Y
R
ZONE 2T'STAT
C
W
Y
R
R1
0
B
G
ZONE 1T'STAT
CAUTION
0
R
C
+
-
ADDITIONALZONE PANEL
#1: WIRING DIAGRAMHEATING ONLY INSTALLATION
rol PanelK6
K7
R6
R7
C7 +
C6 +
D11
D12
D10
D6
D4
D9
D5
D3
D21
D22
D20
D19
D24
D23
D25
D26
C
W
Y
R
ZONE 2T'STAT
C
W
Y
R
R1
0
B
G
ZONE 1T'STAT
CAUTION
0
R
C
+
-
ADDITIONALZONE PANEL
#2: WIRING DIAGRAMCOOLING ONLY INSTALLATION
APPL ICA TIO N NOTES
OPERATION
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. Thisallows any zone thermostat to call for heat.When a zone calls for heat, the controlpanel closes the circuit from "R" to "W"activating the furnace. The zone dampercalling for heat remains open and zonessatisfied will close. The fan and limit controlin the furnace will operate the fan.
1. HEAT MODE:
2. COOL MODE:To operate the system in the cool mode,the "O" terminal has to be made to the "R1"terminal on the zone 1 terminal block. Thisallows for any thermostat to call for cooling.On call for cooling, terminals "R", "G" and"Y" are made to bring on the fan andcompressor. The dampers for zones callingwill remain open; the dampers satisfied willclose.
3. OFF POSITION:When the subbase on zone 1 is in the"OFF" position the entire system is disabled.
4. CONTINUOUS FAN:When placing the fan switch on thesubbase from "AUTO" to "ON" position, thepanel closes the circuit between "R" and "G"terminals to energize the fan relay.
5. OPEN-CLOSE SWITCHES:If left in the open position when all zonessatisfy, the damper will drive to openposition. If left in closed position, when allzones satisfy , the damper will remainclosed unless it is the last zone to satisfy;then it will remain open.
NOTE: The last zone to satisfy will alwaysbe open regardless of position of switch.
WIRING
1. HVAC SYSTEM:Wiring the HVAC system to the EWC-ST-2Eor EWC-ST-3E is typical of wiring a subbaseto a heating/cooling system. (4 wiresrequired.)
The following terminals are on the systemterminal block:R-
Y-
W-
G-
Wire to the RH heating transformerand/or the RC cooling transformer.
Wire to the Compressor Relay.
Wire to Heat Control (gas valve, oilburner relay) on system terminal block.
Wire to Fan Relay.
2. TRANSFORMER 24V 40VA:A separate 24V 40VA transformer is requiredto be wired to terminals 1 and 2 of theterminal block labeled "T-Former". (2 wiresrequired.) This transformer powers the panelboard, thermostats and damper motors. Itdoes not power the furnace or the airconditioner. The board is now protected by a Thermal Polyfuse at the transformer input.When the polyfuse trips it will get quite hot. To reset the breaker, remove the 24 VAC for approximately 30 seconds. Check the damper motors and field wiring for shorts. If adding two panels together, be sure of wiring in (+ and - ) circuit.
3. ZONE DAMPER MOTORS:Use 3 conductor wire from each set of MANor RDN zone damper terminals or 2conductor wire on "SR" dampers to thepanel. See diagrams #4 and 5 when wiringmore than one damper per zone.
ZONE 1: Thermostats that have subbaseswith "B" and "O" terminals are required toenable system changeover. These includemechanical and battery operatedthermostats (6 wires required - terminals W,Y, G, R, B and O), and electro-mechanicaland programmable digital thermostats (24VAC, 7 wires required - terminals C, W, Y,G, R, B and O).
If model MCS-DXB remote selector switch isused, it will be wired to the zone 1 terminalblock in place of the changeover subbase(7 wires required total: 4 on the MCS-DXB -B, G, O and R1; 3 on the thermostat - W,Y and R). See diagram #3.
OTHER ZONES: 3 wires are required formechanical and battery operatedthermostats - terminals W, Y and R. 4 wiresare required for electro-mechanical and 24VAC digital thermostats - terminals C, W, Yand R. No subbases required.
See page 6 for specific types ofthermostats required.
4. THERMOSTATS:
5. HEAT ONLY OR COOL ONLY
Zone 1 no longer requires a subbase orremote switch. All zones need only a twoor three wire thermostat to operate in eitherheat or cool.
APPLICATIONS:
2
CONTROL SYSTEM
EWC Controls Inc. • 385 Highway 33 • Englishtown, NJ 07726 • 800-446-3110 • FAX 732-446-5362
R GYW O B
ZONE 2 THERMOSTAT
R GYW O B
ZONE 1 THERMOSTAT
FIELDINSTALLED
JUMPER
R GYW O B
ZONE 2 THERMOSTAT
R GYW O B
ZONE 1 THERMOSTAT
FIELDINSTALLED
JUMPER
PanelK6
K7
C
W
Y
R
ZONE 2T'STAT
C
W
Y
R
R1
0
B
G
ZONE 1T'STAT
CAUTION
0
R
C
+
-
PLEASE read allinstructions carefullybefore starting the
installation procedures.
ADDITIONALZONE PANEL
CONTROL SYSTEM
GR
EE
N
BRO
WN
RED
ORANGE
RED HEAT
OFF
COOL
FAN
ON AUTO
Front of Plate Back of Plate
#4: TYPICAL TANDEMDAMPER WIRING
3
#3: EWC-ST-2E WITH MCS-DXBREMOTE SELECTOR SWITCH
#5: CONTROL OF UP TO FOUR DAMPERS PER ZONEUSING EXTERNAL RELAY
K9
K8
X
R
G
W
Y
B
O
1
2
K4
SW1
24VT'FORMER
K2
K1
K5
OPEN
CLOSE
OPEN
CLOSE
SW2
M1
M2
M4
M6
ZONE2
M1
M2
M4
M6
ZONE1
MOTOR
MOTOR
Model
CONTROLSEnglishtown
MA-ND4 TYPE MOTORS ONND OR URD TYPE DAMPERS
EWC Controls Inc. • 385 Highway 33 • Englishtown, NJ 07726 • 800-446-3110 • FAX 732-446-5362
CB1
RED
RED
BROWN
ORANGE
GREEN
1
6
4
1
6
4
1
6
4
1
6
4
24VAC TRANSFORMER
40 - 60VA RATINGMAX. NUMBER OF 4 DAMPERS
PER ZONE.
Multiple Damper Wiring on a Single Zone, using a Separate Transformer and an Isolating Relay. Maximum of 4 dampers per 40 va transformer.
M1
M2
M4
M6
ZONE MOTOR4
61
46
14
61
2
1
3
COIL24 vac
NC
NO
C
R1 Isolation Relay SPDT action with 24 vac coilRelay is shown de-energized. All dampers are closed.
To Line VoltageProvide over current protection
46
1
Separate 24 vac Transformer
TYPICAL FEEDER CONDUCTOR
TYPICAL JUNCTION POINT
L1
L2
H
C
One relay coil=One motor.Don’t overload your powertransformer, by connectingtoo many relays.
R GYW O B
ZONE 2 THERMOSTAT
R GYW O B
ZONE 1 THERMOSTAT
#6: TYPICAL FAN CENTER AND OILBURNER WITH ISOLATION RELAY #7: TYPICAL GAS FURNACE
#8: FAN CONTROLWITH HOT WATER COIL
#9: ZONING IN HEATING ONLYNO ZONE CONTROLLED COOLING
4
LAY
RELAY
T
T
rol Panel
CONTROL SYSTEM
K6
K7
R6
R7
C7 +
C6 +
D11
D12
D10
D6
D4
D9
D5
D3
D21
D22
D20
D19
D24
D23
D25
D26
C
W
Y
R
ZONE 2T'STAT
C
W
Y
R
R1
0
B
G
ZONE 1T'STAT
CAUTION
0
R
C
+
-
PLEASE read allinstructions carefullybefore starting the
installation procedures.
ADDITIONALZONE PANEL
K9
K8
X
R
G
W
Y
B
O
1
2
K4
SW1
24VT'FORMER
K2
K1
K5
OPEN
CLOSE
OPEN
CLOSE
SW2
M1
M2
M4
M6
ZONE2
M1
M2
M4
M6
ZONE1
MOTOR
MOTOR
Model
CONTROLSEnglishtown
K9
K8
X
R
G
W
Y
B
O
1
2
K4
SW1
24VT'FORMER
K2
K1
K5
OPEN
CLOSE
OPEN
CLOSE
SW2
M1
M2
M4
M6
ZONE2
M1
M2
M4
M6
ZONE1
MOTOR
MOTOR
Model
CONTROLSEnglishtown
K9
K8
X
R
G
W
Y
B
O
1
2
K4
SW1
24VT'FORMER
K2
K1
K5
OPEN
CLOSE
OPEN
CLOSE
SW2
M1
M2
M4
M6
ZONE2
M1
M2
M4
M6
ZONE1
MOTOR
MOTOR
Model
CONTROLSEnglishtown
EWC Controls Inc. • 385 Highway 33 • Englishtown, NJ 07726 • 800-446-3110 • FAX 732-446-5362
CB1 CB1
CB1
ISOLATION RE
HEATING
Y
C
Y
C
W
C
Y
R
G
Y
C
C
Y
R
G
RELAY
T
T
ISOLATIONRELAY
HEATING
Y
C
Y
C
C
Y
R
G
JUMPERS
CUT
**CUT ‘J1’ JUMPER**
FANCENTER
OUTDOORCONDENSING
UNIT
GAS FURNACE
OUTDOORCONDENSING
UNIT
OUTDOORCONDENSING
UNIT
AIRHANDLER
R GYW O B
ZONE 2 THERMOSTAT
R GYW O B
ZONE 1 THERMOSTAT
FIELDINSTALLED
JUMPER
5
#10: WIRING DIAGRAMINTERCONNECTION OF TWO PANELS FOR ADDITIONAL ZONES
MASTER PANEL
SLAVE PANEL
PANELS MAY BE DAMAGED IF NOTWIRED EXACTLY
AS SHOWN
0 to 0R to RC to C+ to +- to -
K9
K8
C9
C8
Z9
Z8
D19
D20
D21
D22
D26
D25
D24
D23
Z7
C6
C7
D17
D18
D12
D11
D10
D9
D3
D4
D5
D6
D13
D14
D15
D16
Z6
K3
K5
K4
K2
K1
K6
K7
C3
C2
C1
C5
C4
Z5
Z4
Z2
Z1
Z3
D8
D7
D1
D2
SW2
SW1
Y
W
R
C
ZONE-3
C
C
R
R
W
W
Y
Y
ZONE-2
ZONE-1
OPEN
OPEN
CLOSE
CLOSE
OPEN
CLOSE
M1
M2
M4
M6
ZONE3
M1
M1
M2
M2
M4
M4
M6
M6
ZONE2
ZONE1
T'STAT
T'STAT
T'STAT
MOTOR
MOTOR
MOTOR
-+
R
O
C
G
B
O
R1
X
R
G
W
Y
B
O
1
2
24VT'FORMER
Model EWC-ST-3E
CONTROL SYSTEM
CONTROLS INC.Englishtown, NJ
CAUTIONPLEASE read all
instructionscarefully before
starting theinstallation
procedures.
ADDITIONALZONE PANEL
EWC Controls Inc. • 385 Highway 33 • Englishtown, NJ 07726 • 800-446-3110 • FAX 732-446-5362
CB1
K9
K8
C9
C8
Z9
Z8
D19
D20
D21
D22
D26
D25
D24
D23
Z7
C6
C7
D12
D11
D10
D9
D3
D4
D5
D6
Z6K5
K4
K2
K1
K6
K7
C2
C1
C5
C4
Z5
Z4
Z2
Z1
D8
D7
D1
D2
SW2
SW1
C
C
R
R
W
W
Y
Y
ZONE-2
ZONE-1
OPEN
OPEN
CLOSE
CLOSE
M1
M1
M2
M2
M4
M4
M6
M6
ZONE2
ZONE1
T'STAT
T'STAT
MOTOR
MOTOR
-+
R
O
C
G
B
O
R1
X
R
G
W
Y
B
O
1
2
24VT'FORMER
CONTROL SYSTEM
CONTROLS INC.Englishtown, NJ
CAUTIONPLEASE read all
instructionscarefully before
starting theinstallation
procedures.
ADDITIONALZONE PANEL
CB1
Model EWC-ST-2E
1
6
4
1
6
4
1
6
4
1
6
4
1
6
4
DAMPER MOTORS
DAMPER MOTORS
TRANSFORMER
C
Y
G
Y
W
C
R
HVACEQUIPMENT
R GYW O B
ZONE 3 THERMOSTAT
R GYW O B
ZONE 2 THERMOSTAT
R GYW O B
ZONE 1 THERMOSTAT
R GYW O B
ZONE 5 THERMOSTAT
R GYW O B
ZONE 4 THERMOSTAT
PANELS MAY BEDAMAGED IF NOTWIRED EXACTLY
AS SHOWN
6
TH ERMO STAT REQUIR EMENTS
K6
K7
R6
R7
C7 +
C6 +
D11
D12
D10
D6
D4
D9
D5
D3
D21
D22
D20
D19
C
W
Y
R
ZONE 2T'STAT
C
W
Y
R
R1
0
B
G
ZONE 1T'STAT
CAUTION
EWC Controls Inc. • 385 Highway 33 • Englishtown, NJ 07726 • 800-446-3110 • FAX 732-446-5362
3 WIRES REQUIRED
SUPPLIER
DIGITAL NON-PROGRAMMABLE
THERMOSTATS(Battery Operated)
DIGITALPROGRAMMABLE
THERMOSTATS(Battery Operated)
6 WIRES REQUIRED
SUPPLIER
DIGITAL NON-PROGRAMMABLE
THERMOSTATS(Battery Operated)
DIGITALPROGRAMMABLE
THERMOSTATS(Battery Operated)
EWT - 3707
1F80-2611F78-144
9610
96109600
EWT - 3707
9500
94009500
1F97-12711F80-261
1F86-2441F78-144
ZONES 2 & HIGHER
ZONE 1
EWC®CONTROLS
WHITE®
RODGERS
ROBERT-®
SHAW
EWC®CONTROLS
WHITE®RODGERS
ROBERT-®
SHAW
®HONEYWELL
®HONEYWELL
TH3110D
TH3110D
TH4110D
TH4110D
C R GYW RC/O RH/B
ZONE 2 THERMOSTAT – MODEL EWT-3611
C R GYW RC/O RH/B
ZONE 1 THERMOSTAT – MODEL EWT-3611
EWT - 3611
EWT - 3611
If the application is heat only, cool only or using the MCS-DXBremote system selector switch, all thermostats must be set to the same mode of operation at all times.
Zone 2 and Zone 3 thermostats must be in the same mode(Heat or Cool) as the Zone 1 thermostat.
3
The Zone 1 (Master) thermostat must be set to heat or cool mode,in order for Zone 2 or Zone 3 to function! If Zone 1 is turned “OFF”Zone 2 and Zone 3 cannot function.
7
#12: SYSTEM CIRCUIT
#11: THERMOSTAT CIRCUIT
CH ECK OUT PROCEDUR E
#13: DAMPER CIRCUIT
K6
K7
R6
R7
C7 +
C6 +
D11
D12
D10
D6
D4
D9
D5
D3
D21
D22
D20
D19
D24
D23
D25
D26
C
W
Y
R
ZONE 2T'STAT
C
W
Y
R
R1
0
B
G
ZONE 1T'STAT
CAUTION
0
R
C
+
-
PLEASE read allinstructions carefullybefore starting the
installationprocedures.
ADDITIONALZONE PANEL
D15
D16
D18
D17
C
W
Y
R
ZONE 3T'STAT
HEATING MODE OFF MODE COOLING MODE
STAT
DAMPER
CALLING
OPEN
NOT CALLING
CLOSED
24 VOLTS
24 VOLTS
COMMON COMMON
O VOLTS
O VOLTS
O VOLTS
O VOLTS
O VOLTS
24 VOLTS
24 VOLTS
24 VOLTS
24 VOLTS
24 VOLTS
INPUT TO PANEL:COMMON
24 VOLTS
NOTE: Conditions shown are with atleast one thermostat always calling.When all thermostats satisfy, damperposition will depend on position of"OPEN-CLOSED" switch. In "OPEN"position, damper will drive to openposition. In "CLOSED" position, allvoltage is removed from damper motor;motor will remain in whatever position itwas in when all thermostats satisfied.
If 24 volts is present from M1 to M4 andM1 to M6, damper motor may either beturning or stuck between open andclosed postions.
EWC Controls Inc. • 385 Highway 33 • Englishtown, NJ 07726 • 800-446-3110 • FAX 732-446-5362
K9
K8
K3
K5
K4
K2
K1
SW2
SW1
OPEN
OPEN
CLOSE
CLOSE
OPEN
CLOSE
M1
M2
M4
M6
ZONE3
M1
M1
M2
M2
M4
M4
M6
M6
ZONE2
ZONE1
MOTOR
MOTOR
MOTOR
X
R
G
W
Y
B
O
1
2
24VT'FORMER
EWC-ST-3E
CONTROLSEnglishtown
K9
K8
K3
K5
K4
K2
K1
SW2
SW1
OPEN
OPEN
CLOSE
CLOSE
OPEN
CLOSE
M1
M2
M4
M6
ZONE3
M1
M1
M2
M2
M4
M4
M6
M6
ZONE2
ZONE1
MOTOR
MOTOR
MOTOR
X
R
G
W
Y
B
O
1
2
24VT'FORMER
EWC-ST-3E
CONTROLSEnglishtown
O VOLTS 24 VOLTS
COMMON COMMON
24 VOLTS 24 VOLTS
COMMON COMMON24 VOLTS 24 VOLTS
CB1 CB1
8
#14: WIRING DIAGRAMMODEL EWC-ST-3E CONTROL PANEL
CONTROLS INC.
Excellence Without Compromise
Technical . . . . . . . 800-446-3110Sales . . . . . . . . 800-446-3110Fax . . . . . . . . .
EWC Controls Inc. • 385 Highway 33 • Englishtown, NJ 07726 • 800-446-3110 • FAX 732-446-5362
K9
K8
C9
C8
Z9
Z8
D19
D20
D21
D22
D26
D25
D24
D23
Z7
C6
C7
D17
D18
D12
D11
D10
D9
D3
D4
D5
D6
D13
D14
D15
D16
Z6
K3
K5
K4
K2
K1
K6
K7
C3
C2
C1
C5
C4
Z5
Z4
Z2
Z1
Z3
D8
D7
D1
D2
SW2
SW1
Y
W
R
C
ZONE-3
C
C
R
R
W
W
Y
Y
ZONE-2
ZONE-1
OPEN
OPEN
CLOSE
CLOSE
OPEN
CLOSE
M1
M2
M4
M6
ZONE3
M1
M1
M2
M2
M4
M4
M6
M6
ZONE2
ZONE1
T'STAT
T'STAT
T'STAT
MOTOR
MOTOR
MOTOR
-+
R
O
C
G
B
O
R1
X
R
G
W
Y
B
O
1
2
24VT'FORMER
Model EWC-ST-3E
CONTROL SYSTEM
CONTROLS INC.Englishtown, NJ
CAUTION
ADDITIONALZONE PANEL
CB1
732-446-5362
1
6
4
DAMPER MOTORS
1
6
4
1
6
4
24VACTRANSFORMER
C
Y
HVACEQUIPMENT
G
Y
W
C
R
C YW R GRC/O RH/B
ZONE 2 THERMOSTAT – MODEL EWT-3611
C YW R GRC/O RH/B
ZONE 3 THERMOSTAT – MODEL EWT-3611
C YW R GRC/O RH/B
ZONE 3 THERMOSTAT – MODEL EWT-3611