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ML6984 On-Off Operation:
For on-off operation, ML6984 requires a 24 Vac SPDT contact.
An interface relay such as RA889 is required to power the
anticipator heater of an electromechanical thermostat such as
T87F. Please refer to Figure 12.
1
R
L1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
SET HEATING ANTICIPATOR TO MATCH CURRENT DRAW OF RELAY 1K.
2
DO NOT ROUTE RELAY CONTACTS THROUGH THERMOSTAT.
—
FIG. 12
ML6984 WITH Honeywell Round
If connecting the ML6984 directly to a T87F with a Series 20
sub-base, clip out the cooling anticipation resistor on the sub-
base between terminals R
compatibility with ML6984 but may result in wider room
temperature swings due to the loss of anticipation.
REPLACEMENT NOTES
TO REPLACE ML784 or ML984:
1. The old ML784 or ML984 actuators cannot be used with new
ML7984 valve actuators in the same circuitry, unless the old models
are each powered by their own transformer to prevent cross-talking.
2. The ML7984 is a direct replacement for all old ML784 and ML984,
except:
a) When replacing the old reverse acting models, the signal input
wires to the new devices no longer need to be reversed. Just follow
the terminal polarity designations and DIP switch settings.
b) When replacing the old actuator which has an Electronic Series 90
"Supermod" controller - e.g.: T775, W973, H775, W7100 - the old
interface resistor must be removed. The ML7984 Series 4000 will
work directly with the controller without the external 240! resistor.
c) When replacing the old ML784 (mA model) in multiple-actuator
installations, resistor(s) will be needed. Use Resistor Kit (Part
#272822) and set DIP switches accordingly. See Figures 12 & 13.
TO REPLACE ML684:
1. The new ML6984 is a direct replacement for the old ML684A in
single actuator or parallel multiple actuators hook-up. The old and
new actuators can be mixed in the same electrical circuit. For
multiple actuators controlled by a common controller in parallel,
these actuators must be wired so that they all travel in the same
direction.
2. When replacing the ML684A1009 (80 lbf) with this new ML6984 on
the V5045 valve, the installed valve adaptor (part # 272629A) on
the valve stem and actuator assembly is still needed.
1K1
2
B
R
W
T5
T6
1K
TM
THERMOSTAT
and Y. This is needed for electrical
c
See Fig. 13, if connecting TH5110D or TH6110D FocusPRO
thermostats to ML6984. Configure the thermostats for Series 20
operation.
TH5110D
Rc
TH6110D
R
Y
C
4
W
O/B
W
G
ML6984
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
FACTORY INSTALLED JUMPER.
2
OPTIONAL 24 VAC COMMON CONNECTION.
3
CONFIIGURE SYSTEM TYPE TO HEAT ONLY IN THE INSTALLER SETUP.
4
5
TERMINALS R AND T5 ARE INTERNALLY CONNECTED.
FIG. 13 — ML6984 WITH FocusPRO
TO REPLACE ML6874:
1. The ML6984 is a direct replacement for the old ML6874 in
single actuator hook-up.
2. For parallel, multiple ML6874 actuators applications, an
isolation relay must be used. The isolation relay contacts
should be placed in the new ML6984 actuator signal input
"W" and "B" circuit.
TO REPLACE LINE VOLTAGE AUXILIARY
SWITCHES:
These accessories are no longer available. Replace the old
actuator with new model and 272630D position feedback/
auxiliary switch module.
Operate an external relay, such as R8845U, using the adjust-
able SPDT pilot duty output on the 272630D.
If a second, independent output switch is needed, wire the
2-10 Vdc position feedback signal to an Approved, adjustable,
voltage-controlled relay.
!
NOTE:
The 272630D position feedback/auxiliary switch module
cannot be used with ML6984 3-wire installation. The 272630D
requires continuous power.
The ML6984 5-wire installation recalibrates its position each
time terminals T5 and T6 are (re)powered when 272630D is
installed.
10
THERMOSTAT WIRING TERMINALS
2
3
ML6984
POWER TO OPEN
B
W
R
AND POWER TO
CLOSE
MOTOR OR VALVE
T5
T6
5
(SERIES 20)
TM
ELECTRONIC
THERMOSTAT
TM
1
L1
R
(HOT)
C
L2
95C-10939-4
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