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Fig. 7 - 5-ZONE SYSTEM USING AN AT72A TRANSFORMER TO POWER UP TO 4 ZONE VALVES. (AT20B CAN
POWER MAXIMUM OF 2 VALVES)
ZONE 1
ZONE 2
T86A
V8043F
END SWITCH
TH-TR TH
TR
OPERATION:
CAUTION
!
1.
Disconnect power supply before connecting wiring to pre-
vent electrical shock and equipment damage.
2. Never jumper the supply wires or actuator terminals even
temporarily. This may damage the thermostat.
The actuator has three different manual settings: AUTO,
OPEN and SWITCH (on 300 psi models only). In AUTO mode,
the valve cycles with the thermostat and activates the auxiliary
switch when valve is at full open.
In OPEN mode, the valve is opened to allow the system to be
filled, flushed or drained. The auxiliary switch is not activated.
The valve returns to AUTO mode when it is energized.
In SWITCH mode (on 300 psi models only), the valve is
opened and the auxiliary switch is activated to run the pump. The
valve returns to AUTO mode when it is energized.
NORMALLY CLOSED MODELS:
With the manual opener set to AUTO and the powerhead ener-
gized, the valve is opened as shown in Fig. 8-1. When the powerhead
is de-energized, a spring return mechanism drives the valve to the
closed positions shown in Fig. 8-2. The valve can also be opened
with no electrical power by moving the manual opener lever over
the stop and pushing slowly and firmly to the 'MAN OPEN'* posi-
tion. The valve will return to automatic position when the valve is
energized.
ZONE 3
T86A
T86A
V8043F
V8043F
END SWITCH
END SWITCH
END SWITCH
END SWITCH
TH-TR TH
TH-TR TH
TR
(L1 HOT)
L2
ZONE 4
T86A
V8043F
END SWITCH
TH-TR TH
TR
TR
95-6739 8-1-8
WIRING CODE
LOW VOLTAGE
POWER
LINE VOLTAGE
SUPPLY
*Auxiliary switch is not energized when the valve is manually
opened.
NORMALLY OPEN MODELS:
When the powerhead is de-energized, a spring return mecha-
nism drives the valve to the open position. See Fig. 8-1. When ener-
gized, the valve is closed as shown in Fig. 8-2. A reverse acting
thermostat is required to control a normally open valve.
Inlet port is stamped 'A', outlet Port is stamped 'B' on the valve
body.
Fig. 8 - V8043 OPERATION FOR N.C. VALVE
A
In
Open Position
8-1
Home and Building Control
Honeywell Limited-Limitee
35 Dynamic Drive
Toronto, ON, Canada
M1V 4Z9
TO BURNER
ZONE 5
AND/OR
CIRCULATOR
CIRCUIT*
T86A
*MAXIMUM
CURRENT:
4.40 AMP. AT
120VAC
V8043F
END SWITCH
TH-TR TH
TR
(L1 HOT)
L2
AT208
TRANSFORMER
NOTE
A
B
In
Out
Closed Position
8-2
Automation and Control Solutions
Environmental Control Products
1985 Douglas Drive North
Golden Valley, MN, USA
55422-3992
120V
B
Out
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