EAV - EME/EMD Rev. A Models
R CYO
-------- ZONE 1 --------
RH/RC
SWITCHING
RELAY #1
COIL
COIL
NO
NC
NC
NO
COIL
COM
NC
NO
NO
NC
HEAT/COOL
RELAY
NO
NC
1 2 3 4
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
ZONE 5
1 2 3 4
ZONE 6
2 WIRE ZONE VALVE
(NO END SWITCH)
MUST USE JUMPER
TACO
3 WIRE
ZONE VALVE
1
2
3
JUMPER
3 & 4
MOTOR END
SWITCH
4 WIRE ZONE VALVE
(POWER OPEN,
SELF CLOSING)
ZVC 406 – 4
ZONE VALVE CONTROL
N/O
COM
N/C
PUMP END
SWITCH
ZONE 6 PUMP
END SWITCH
24 VAC ZONE VALVES PRIORITY
X X
Powered from Transformer A Powered from Transformer B
Wiring from this terminal strip to the relays, Taco zone controller and HBX ECO-0550 not shown in this diagram.
Field wiring is shown
as gray shaded areas
(high voltage wiring
not shown)
R C1Y1O
Field installed relays
Use Enertech part #
43P020-01NN for both.
4
Use these terminals
to enable system
pump (see piping
diagrams).*
*These contacts will close with a call from
any thermostat. For constant speed pump,
use these contacts to power the pump
when there is a htg/clg call (break the “L”
terminal for a 115V pump). For variable
speed pump, use these contacts to enable
the pump (typically a contact closure will
“tell” the pump to start modulating).
Secon 8: Field Wiring
Diagram HTGCLG-7: Heang/Cooling
Controls to be Used when a Buffer Tank
Is Installed (at least one fan coil is
smaller than 2 tons)
C RC RH W/Y
-------- ZONE 3 --------
C RC RH W/Y
-------- ZONE 4 --------
C RC RH W/Y
-------- ZONE 5 --------
C RC RH W/Y
-------- ZONE 6 --------
RH/RC
SWITCHING
RELAY #2
TANK
O R Y2 Y1
-- HEAT PUMP/BACKUP BOILER --
T T HT HT CT CT
- HOT TNK, COLD TNK, O.D. SENSOR -
OD OD
HBX ECO-0550
Enertech
MPH
Fan Coil
Y2W1G
R CY1O
Heat Pump
Thermostat
Y2W1G
RD
Multi-Aqua
Fan Coil
BLLYL
NOTES 2,3
Zone Valve
Connections
(t-stat connections
not shown)
Terminal L (SEC) is
at circuit board.
C RC RH W/Y
-------- ZONE 2 --------
W
Radiant
Floor
t-stat
RC
NOTES 2,3 NOTE 4
NOTE 1
RHHEAT
Enertech
EM Indoor
Module
COOL
7
C
Thermistor to
Buer Tank
Thermistor for
Outdoor Air Temp
(for Outdoor Temp Reset)
ECO-0550 is the buer tank controller
⚠ CAUTION ⚠
TRANSFORMER MUST BE
REMOVED FROM EACH
FAN COIL TO AVOID PHASING
ISSUES BETWEEN FAN COILS
AND THE ZONE PANEL.
NOTES:
1. Zone 1 must use a heat pump thermostat, even if the fan coil does not have
heat pump terminals (Enertech fan coils have heat pump style wiring).
2. RC supplies 24VAC the the thermostat in cooling mode; RH supplies 24VAC
to the thermostat in heating mode (based upon the mode of zone 1). In
most cases, RH and RC will be jumpered for fan coils to allow heating and
cooling.
3. If RC and RH are jumpered in zone 2, zone 3 will also be a htg/clg zone; if
RC and RH are jumpered in zone 4, zones 5 and 6 will also be htg/clg zones.
In this example, the radiant zones should be used on zones 4, 5, and 6, since
zones 1, 2, and 3 are heating and cooling zones. Adding a radiant zone to
zone 3 would allow water ow through the oor in cooling, which would not
typically be a good idea in most climates.
4. The tank controller only needs one buer tank thermistor (terminals HT, HT)
for a single tank. The CT, CT terminals are not used with this application.
⚠ CAUTION ⚠
TRANSFORMER IN THE ZONE
PANEL WILL NEED TO BE UP-
SIZED FOR THIS APPLICATION
(SEE GEO-FLO INSTALLATION
MANUAL FOR CALCULATIONS).
8 9 10
3 4
⚠NOTICE ⚠
THE EM UNIT TERMINALS ARE
POLARITY SENSITIVE. TERMINALS
7 AND 9 ARE COMMON. ENSURE
THAT 8 AND 10 ARE CONNECTED
TO RELAY 1 AND THAT TERMINAL
9 IS CONNECTED TO RELAY 2.
RELAY 1
RELAY 2
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