9. Connect all four black wires from the transducer har-
nesses (with a wire nut provided) to the other end of the
black wire that was connected to TB3 earlier. See
Fig. 3.
10. Connect the white wires from the transducer harnesses
to the white wires from the PSIO1 plug assembly as fol-
lows (See Fig. 3):
a. Connect the 2 white wires from the harnesses that
were brought in through the left side of the control
box in Step 4 to PSIO1, J7-TOP. Connect one to the
white wire from terminal 7 and the other to the white
wire from terminal 13.
b. Connect the two white wires from the harnesses that
were brought in through the right side of the control
box in Step 5 to the white wires coming from PSIO1,
J7-TOP. Connect one to the white wire from termi-
nal 10, and the other to the white wire from ter-
minal 16.
c. Run the probe ends of the 2 thermistors and the plug
ends of the wires on the 4 harnesses to the compres-
sors for installation.
054-074 UNITS — Connect the thermistors and transducer
harness wires as follows:
1. Locate the 2 thermistors and the 28-ft long coil of PVC-
jacketed cable.
2. Mark both ends of one of the thermistors.
3. Cut the coiled cable into 2 equal lengths and mark both
ends of one of the lengths.
4. Run one end of each of the cable pieces and the lead
end of each of the thermistors through the field wiring
opening and into the control box (See Fig. 4).
5. Connect the red and black leads from the marked ther-
mistor to PSIO2, plug J7-TOP, pins 2 and 3.
6. Connect the red and black leads from the unmarked ther-
mistor to PSIO2, plug J7-TOP, pins 5 and 6.
7. Strip back the first 6 inches of the jacket on both PVC
cables from Step 3. There should be 5 wires: one each
of red, black, green, white, and brown. In the event that
the colors do not match, substitute the alternate color(s)
into these instructions so that this accessory will be prop-
erly wired.
NOTE: See Fig. 4 for Steps 8-14, below.
8. Strip back the red wire from each cable and connect it
with a wire nut (provided) to the red wire from TB2.
9. Strip back the black wire from each cable and connect
it with a wire nut (provided) to the black wire from TB2.
NOTE: The green wire from each cable WILL NOT be used.
Cut the green wire so that it is flush with the PVC cable.
10. Using the wire nut provided, connect the white wire from
the marked cable to the white wire from PSIO1, plug
J7-TOP, pin 7.
11. Using the wire nut provided, connect the brown wire
from the marked cable to the white wire from PSIO1,
plug J7-TOP, pin 13.
12. Using the wire nut provided, connect the white wire from
the unmarked cable to the white wire from PSIO1, plug
J7-TOP, pin 10.
13. Using the wire nut provided, connect the brown wire
from the unmarked cable to the white wire from PSIO1,
plug J7-TOP, pin 16.
14. Run the other ends of the 2 cables and 2 thermistors out
to the compressor section with the marked cable and ther-
mistor going to compressor no. 1.
Compressor Section Wiring —
This section will de-
tail the accessory kit wiring in the compressor section. When
instructed to plug each transducer into its respective har-
ness, do so and leave the transducer open to atmosphere and
near where it will need to be installed (either the discharge
service valve or the low-pressure switch location). Each trans-
ducer will have to be calibrated BEFORE actual installation
onto the compressor.
024-034 UNITS — To wire the compressor section:
1. Locate the sheet metal mounting bracket, the connec-
tion boxes (only one is needed for this installation), the
connection box covers, the connectors, the varnish cloth,
and the screws in the accessory package.
2. Mount the sheet metal bracket to the frame (upright) be-
low the liquid line sight glasses (see Fig. 7), using the
screws provided.
3. Mount one of the connection boxes onto the bracket us-
ing the screws provided.
4. Use 2 of the knockouts on the connection box and in-
stall 2 wiring connectors.
5. Run the other end of the 6-wire harness through one of
the connectors and into the connection box using a piece
of varnish cloth.
NOTE: Harness can be found wire-tied to one of the liquid
lines.
6. Locate the 4 transducer plug harnesses and the 4 trans-
ducers in the accessory kit.
7. Plug one into each transducer, and mark both ends of
each white wire differently so they can be differentiated.
Run the other ends of the harnesses into the other con-
nector and into the connection box using a piece of var-
nish cloth.
8. Using a wire nut (provided), connect the 4 red wires from
the transducer harnesses to the red wire from the unit
6-wire harness. See Fig. 5.
9. Using a wire nut (provided), connect the 4 black trans-
ducer harness wires to the black wire from the unit
6-wire harness. See Fig. 5.
10. Connect the white wire from compressor no. 1 dis-
charge transducer harness to the brown wire from the
unit harness (See Fig. 5).
11. Connect the white wire from compressor no. 1 suction
transducer harness to the white wire from the unit har-
ness (See Fig. 5).
12. Connect the white wire from compressor no. 2 dis-
charge transducer harness to the orange wire from the
unit harness (See Fig. 5).
13. Connect the white wire from compressor no. 2 suction
transducer harness to the gray wire from the unit har-
ness (See Fig. 5).
14. Install the cover on the connection box.
034,044 UNITS — To wire the compressor section:
1. Locate the transducer plugs that were run up through the
bottom left-hand side of the control box (See Fig. 3).
2. Connect the transducer plug harness (the one where the
white wire on the other end is connected to PSIO1, J7-
TOP, pin 7) to the discharge pressure transducer for com-
pressor no. 1.
3. Connect the other plug harness (the one where the white
wire on the other end is connected to PSIO1, J7-TOP,
pin 13) to the suction pressure transducer for compressor
no. 1.
4. Locate the transducer plugs that were run up through the
bottom right-hand side of the control box (See Fig. 3).
7
