80
TK 56433-5-MM-EN
Installation of Service Kit
N
No
otte
e:: Do not connect the main/unified wire harness to
the ETV and turn the unit on before the stepper
motor and piston assembly is installed in the
valve body. The controller is programmed to
close the ETV when the unit is turned on. If the
unit is turned on with the ETV connected to main
wire harness, the controller will attempt to close
the ETV. This will cause the piston to be turned
(screwed) off the threaded shaft of the stepper
motor because the valve body is not present to
stop it.
1. The new stepper motor and piston assembly is
supplied with the piston in the open position. In the
open position the bottom edge of the piston is 0.3
to 0.7 in. (8 to 18 mm) from the bottom edge of the
piston housing. The piston retracts to open and
extends to close.
Figure 98.
Stepper Motor and Piston Assembly
with Piston in Fully Open Position
1.
Bottom Edge of Piston Housing
2.
Bottom Edge of Piston
2. Lubricate the O-rings with refrigeration oil. Place
one on the stepper motor and piston assembly and
place the other in the valve body.
Figure 99.
Install O-Ring on Stepper Motor and Piston
Assembly
Figure 100.
Install O-Ring in Valve Body
3. Place stepper motor and piston assembly into the
valve body and make sure the arrowhead marks on
them are aligned as shown below.
Figure 101.
Align Arrowhead Marks
