Replacement Notes - Honeywell ML6984 User Manual

Series 4000 direct coupled valve actuators

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Product data (12 pages)

Product data (12 pages)

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ML6984, ML7984 SERIES 4000 DIRECT COUPLED VALVE ACTUATORS

NOTE: The 272630D position feedback/auxiliary switch

module cannot be used with ML6984 3-wire

installation. The 272630D requires continuous

power.

ML6984 XL10 Controller

Compatibility

XL10 controllers are designed to work with constant-speed

actuators. ML6984 actuators use direct current motors

which vary their speed as the valve seats or if power supply

voltage is not consistent. ML6984 actuators in 5-wire

mode offer 30 discrete positions only. To minimize

potential valve position drift, XL10 controllers should use

the 3-wire installation and be programmed for a daily valve

exercise cycle.

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 (See Fig. 17).

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

SET HEATING ANTICIPATOR TO MATCH CURRENT DRAW OF

RELAY 1K. DO NOT ROUTE RELAY CONTACTS THROUGH

THERMOSTAT.

Fig. 17. ML6984 with Honeywell T87F Round™

Thermostat.

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

for electrical compatibility with ML6984 but may result in

wider room temperature swings due to the loss of

anticipation.

95C-10939—11

1K1

ML6984

M25501

and Y. This is needed