Argosy Research H-125 Series Manual De Usuario

35

Remove the valve cover to access the drive assembly.

Disconnect the power source plug (black wire) from the PC 

board prior to disconnecting the motor or water meter plugs 

from the PC board.  The power source plug connects to the 

four-pin jack.  The motor plug connects to the two-pin jack 

on the left-hand side of the PC board.  The water meter plug 

(gray wire) connects to the three-pin jack on the far right-hand 

side of the PC board.

The PC board can be removed separately from the drive 

bracket but it is not recommended.  Do not attempt to remove 

the display panel from the PC board.  Handle the board by 

the edges.  To remove the PC board from the drive bracket, 

unplug the power, water meter and motor plugs from the PC 

board.  Lift the middle latch along the top of the drive bracket 

while pulling outward on the top of the PC board.  The drive 

bracket has two plastic pins that fit into the holes on the lower 

edge of the PC board.  Once the PC board is tilted about 45º 

from the drive bracket it can be lifted off of these pins.  To 

reinstall a board, push the top of the PC board towards the 

valve until it snaps under the middle latch, weave the power 

and water meter wires into the holders and reconnect the mo-

tor, water meter and power plugs.

The drive bracket must be removed to access the drive 

cap assembly and pistons or the drive gear cover.  It is not 

necessary to remove the PC board from the drive bracket to 

remove the drive bracket.  To remove the drive bracket start 

by removing the plugs for the power source and the water me-

ter.  Unweave the wires from the side holders.  Two tabs on 

the top of the drive back plate hold the drive bracket in place.  

Simultaneously lift the two tabs and gently ease the top of the 

drive bracket forward.  The lower edge of the drive bracket 

has two notches that rest on the drive back plate.  Lift up and 

outward on the drive bracket to disengage the notches.

To reassemble, seat the bottom of the drive bracket so the 

notches are engaged at the bottom of the drive back plate.  

Push the top of the drive bracket toward the two latches.  The 

drive bracket may have to be lifted slightly to let the threaded 

piston rod pass through the hole in the drive bracket.  Main-

tain a slight engaging force on top of the drive bracket while 

deflecting the bracket slightly to the left by pressing on the 

side of the upper right corner.  This helps the drive gears 

mesh with the drive cap assembly.  The drive bracket is 

properly seated when it snaps under the latches on the drive 

back plate.  If resistance is felt before latching, then notches 

are not fully engaged, the piston rod is not in hold, the wires 

are jammed between the drive bracket and drive back plate, 

or the gear is not engaging the drive cap assembly.

To inspect the drive gears, the drive gear cover needs to be 

removed.  Before trying to remove the gear cover, the drive 

bracket must be removed from the drive back plate.  (Refer to 

the instructions above regarding removing the drive bracket 

from the drive back plate.  The drive gear cover can be 

removed from the drive bracket without removing the motor 

or the PC board.)  The drive gear cover is held in place on the 

drive bracket by three clips.  The largest of the three clips is 

always orientated to the bottom of the drive bracket.  With the 

PC board facing up, push in and down on the large clip on the 

drive gear cover.  Handle the cover and the gears carefully so 

that the gears do not fall off the pegs in the cover.

Replace broken or damaged drive gears.  Do not lubricate 

any of the gears.  Avoid getting any foreign matter on the 

reflective coating because dirt or oils may interfere with pulse 

counting.

The drive gear cover only fits on one way, with the large clip 

orientated towards the bottom.  If all three clips are outside of 

the gear shroud on the drive bracket the drive gear cover slips 

easily into place.

The drive bracket does not need to be removed from the drive 

plate if the motor needs to be removed.  To remove the motor, 

disconnect the power and motor plugs from the jacks on the 

PC board.  Move the spring clip loop to the right and hold.  Ro-

tate the motor at least a 1/4 turn in either direction so the wires 

are vertical (up & down)  before gently pulling on the wire 

connectors to remove the motor.  Pulling directly on the wires 

without rotating the motor may break the wires off the motor.

Replace the motor if necessary.   Do not lubricate the motor 

or the gears.  To reinstall the motor, move the spring clip loop 

to the right and hold.  Gently turn the motor while inserting so 

that the gear on the motor meshes with the gears under the 

drive gear cover.  Release the spring clip loop and continue 

to rotate the motor until the wires are horizontal and the mo-

tor housing engages the small plastic bulge inside the drive 

bracket motor retainer.  Reconnect the motor plug to the 

two-pronged jack on the lower left side of the PC board.  If 

the motor will not easily engage with the drive gears when 

reinstalling, lift and slightly rotate the motor before reinserting.  

Reconnect the power plug.

Replace the valve cover.  After completing any valve main-

tenance, press and hold NEXT and REGEN buttons for 3 

seconds or unplug power source jack (black wire) and plug 

back in.  This resets the electronics and establishes the 

service piston position.  The display should flash all wording, 

then flash the software version and then reset the valve to the 

service position.

The drive assembly must be removed to access the drive 

cap assembly.  The drive cap assembly must be removed to 

access the piston(s).  The drive cap assembly is threaded into 

the control valve body and seals with an o-ring.  To remove 

the drive cap assembly use the special plastic wrench or 

insert a 1/4" to 1/2" flat blade screwdriver into one of the slots 

around the top 2" of the drive cap assembly so it engages the 

notches molded into the drive back plate around the top 2" 

of the piston cavity.  See Figure 29.  The notches are visible 

through the holes.  Lever the screwdriver so the drive cap as-

sembly turns counter clockwise.  Once loosened, unscrew the 

drive cap assembly by hand and pull straight out.

The drive cap assembly contains the drive cap, the main drive 

gear, drive cap, piston rod and various other parts that should 

not be dissembled in the field.  The only replaceable part on 

the drive cap assembly is the o-ring.  Attached to the drive 

cap assembly is the main piston and if a regenerant is used, a 

regenerant piston.