Air Techniques A/T2000 XR, Руководство по обслуживанию, Страница: 47 / 60

47
BASE ASSEMBLY - Heater Pad, P/N
45950
Notes: Perform the Evaluation and Checking of Heating Pad procedure (page 46) prior to
replacing Heater Pad.
The covers and racks have been removed and the Heater Pad plug disconnected from
the J4 header per the Evaluation and Checking of Heating Pad procedure.
Heater Pad Removal Procedure
1. Drain and rinse chemistry compartments, carefully turn the unit over to expose the base
assembly and remove the Base Assembly to access the Heater Pad (see page 42, item 27).
2. Slip the blackwires out of the "purse lock" tie wrap (leave fastener in place to use to hold
the black wires of the replacement Heater Pad).
3. Disconnect the Circulator/ Replenisher Drawer (remove one (1) Phillips screw) flip drawer
upside down and lay it to the left onto the internal clear drain hose.
4. Disconnect the ground connector (green/yellow wire) from the ground lug on the Heater Pad.
5. Remove the four (4) Heater Pad retainer discs (unscrew the four (4) Phillips screws).
Each retainer disk may or may not have a flat washer between it and the post to which
it is attached. Discard these washers (if present) and use the washers supplied in the
kit when reinstalling the retainer discs.
6. Pull the clear developer drain hose up, and the orange, white and ground wires to the
side so that the Heater Pad can easily be removed. Note: The orientation of the Heater
Pad so that the replacement Heater Pad is installed the same way.
Heater Pad Installation
Note: Prior to installing the new Heater Pad, inspect its electrical resistance. It must be between
52.5 and 60 ohms.
If necessary, clean and wipe the tank surfaces that will be in contact with the Heater Pad to
be sure that the Heater Pad lies flat on these surfaces for optimum heat transfer.
1. Install the replacement Heater Pad in the reverse sequence that the old one was
removed . Be sure first to slip the "leading edge" under the chemistry replenishment
fittings, and avoid bending or flexing the Heater Pad. Pull the clear developer drain hose
up and work the orange, white and ground wires around the Heater Pad corner, to
allow the Heater Pad to be lowered into place without bending or flexing it. The "leading
edge" is the one that has the black wires and ground lug to its left when viewed from the
orange side.
2. Carefully place the four (4) washers supplied with the kit on the four (4) attachment
posts, and then reinstall the four (4) Heater Pad retainer discs onto the posts with
the washers. Be sure that washers do not fall off while installing the retaining discs. The
only disc whose orientation is critical is the one nearest the developer drain elbow.
Rotate the disc so that the notch aligns with the gate on the molded base (and the
corresponding hole in the Heater Pad).
3. Reinstall and securely tighten the four (4) Phillips screws holding the Heater Pad retaining
discs.
4. Reinstall ground wire to ground lug on Heater Pad.
5. Secure the two (2) black wires into the "purse lock" tie wrap. Install Base Assembly.
6. Reconnect the Heater Pad plug into the J4 header (located on the Connector Mounting
Plate, page 21). Refill tanks with chemistry and replace racks and covers.