JOHNSON CONTROLS
9
FORM 160.43-NM4
ISSUE DATE: 11/12/2012
2
SECTION 2 - INSTALLATION
TOOLS NEEDED
•
Power Drill and a #25 or 9/64 in. drill bit
•
Adjustable wrenches; 6 in. and 8 in.
•
Open-end wrenches; 3/4 in., 5/8 in. and 9/16 in.
•
Screwdrivers; Flat Blade and Phillips
SECURE CHILLER FROM OPERATION
1. Shut off power source feed to the chiller Electron-
ic Control Center (ECC).
2. Lock-Out, Tag-Out the chiller.
3. Pull ECC fuses 1FU, 2FU and 3FU to ensure the
LPCO control wiring is deenergized.
4. Close the evaporator service valve having gauge
piping going to the “Cooler” (evaporator) panel
gauge and LPCO control.
REMOVE PRE-EXISTING LPCO CONTROL
1.
Disconnect LPCO control pressure (¼ in. flare
nut) connection from the pressure tap behind the
“Cooler” (evaporator) panel gauge.
2. Using a voltage meter, reverify the ECC supply
power and to the LPCO control wiring is deener-
gized.
3. Disconnect the three wires (47, 48 and 49) from
the LPCO control and secure out of the way.
4. Remove the two mounting screws and the LPCO
control from the ECC.
MOUNTING 025 45742 LPCO CONTROL
Install unit where shock, vibration and
ambient temperature fluctuations will not
damage unit or affect operation. Orient
unit so that moisture does not enter the
enclosure via the electrical connection.
When appropriate, this entry point should
be sealed to prevent moisture entry.
Do not mount unit in ambient temperature
exceeding Specified limits.
LPCO controls 025 45742 are mounted and operated in
a vertical position with the switch up and pressure con-
nection down. The controls are surface mounted using
two mounting ears, with holes for #10 screws, on either
side of the control bracket plate.
1.
Remove enclosure cover first by removing one
captive screw located on the front of the cover.
2. When replacing a former 225 15443 002 LPCO
control:
a. Select a vertical surface mounting location
on the back wall of the ECC for the replace-
ment LPCO control 025 45742 in the same
general area of the former control. Ensure
that the mounting location allows connection
to the preexisting wiring to the control switch
terminals and for the new capillary tubing to
the “Cooler” (evaporator) panel gauge pres-
sure tap.
b. To reach the LPCO control 025 45742 switch
terminals, the preexisting wires (47, 48 and
49) may need to be relocated through the
cabinet middle conduit fitting containing the
high pressure control wires.
c. Using the LPCO control 025 45742 bracket
plate as a guide, locate and mark the two
mounting holes locations on the ECC back
wall. Ensure that the mounting holes loca-
tions will not interfere with anything within
or outside of the ECC panel.
d. Using a power drill and a #25 or 9/64 in. drill
bit, drill out the two mounting holes.
e. Mount the replacement LPCO control 025
45742 to the back wall of the ECC using
two #10 self tapping screws (YORK p/n 021
14727 000) provided in kit.
3. When replacing a former 025 45742 LPCO con-
trol
a. Mount the replacement LPCO control 025
45742 to the back wall of the ECC where
the former control was located and using
two #10 self tapping screws (YORK p/n 021
14727 000) provided in kit.
