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Document: GFH-NT 1500-4000 IM 14 DEC 2016
Gas Fired Heater Instructions
©2016 NOVATEC, Inc. All Rights Reserved
13.1
GAS VALVE ACTUATOR CW ADJUSTMENT AND PROGRAMMING
The gas butterfly valve rotary actuator is a keypad programmable, direct coupled, modulating motor
that has been fully programmed at the factory. It has been set at the factory to rotate 75 degrees
CW from minimum to maximum position depending on the 4-20 ma signal received from the
temperature controller. The gas butterfly valve rotates a maximum of 75 degrees from full closed to
full open. The Low Fire (LF) closed position is 15 degrees and the High Fire (HF) full open position
is 90 degrees.
If the actuator needs to be replaced, the new one will need to be setup as follows:
1.0 Provide temporary power to the actuator and drive it to the minimum position.
2.0
Set the actuator’s shaft rotation direction to CW (as viewed while facing the actuator’s keypad)
to match that of the butterfly valve.
2.1 Press the
ENTER
key; the message “SC” will appear on the display.
2.2 Press the
UP
or
DOWN
key un
til the number “10” appears in the display.
2.3 Press the
RESET
key to complete the sequence.
3.0
Set the actuator’s lowest shaft travel position (Low Fire Stop) (LF).
3.1 Press the
ENTER
key; the message “SC” will appear on the display.
3.2 Press the
UP
or
DOWN
key until
the number “15” appears on the display.
3.3 Press the
RESET
key; the message “PG” will appear on the display.
3.4 Press the
DOWN
key; the message “LF” will appear on the display.
3.5 Press the
UP
or
Down
key until the number “15” (“15” degree of shaft rotation) appears
on the display.
3.6 Press the
RESET
key to complete the sequence.
4.0
Set the actuator’s highest shaft travel position (High Fire Stop) (HF).
4.1 Press the
ENTER
key; the message “SC” will appear on the display.
4.2 Press the
UP
or
DOWN
key until the number “15” appears on the display.
4.3 Press the
RESET
key; the message “PG” will appear on the display
4.4 Press the
UP
key; the message “HF” will appear on the display.
4.5 Press the
UP
or
DOWN
key until the number “90” (“75” degree of shaft rotation, 15
degree starting position plus 75 degree of rotation) appears on the display.
4.6 Press the
RESET
key to complete the sequence.
5.0
Set the actuator’s shaft position when control signal is zero (Control Signal Loss) (LO)
5.1 Press the
ENTER
key; the message “SC” will appear on the display.
5.2 Press the
UP
or
DOWN
key until the number “12” appears on the display.
5.3 Press the
RESET
key; the message PG will appear on the display.
5.4 Press the
DOWN
key; the message “LO” will appear on the display.
5.5 Press the
UP
or
DOWN
key until the number “15” (“15” degree shaft position) appears
on the display (reference 3.0 above)
5.6 Press the
RESET
key to complete the sequence.
6.0 Remove temporary power.
7.0 Install the coupling to the actuator shaft with a 3 mm slotted spring pin. Insert the coupling onto
the shaft and align the co
upling’s drive hole with the shaft hole. Press the spring pin through
the coupling and shaft.
8.0 Verify that the rotation direction for the butterfly valve and actuator shaft match while the
butterfly valve is in its minimum position.
