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Step 4 — Install Control Wiring
Be sure all power to the unit is off before proceeding.
Lock out and safety-tag all disconnects.
Wires between field-installed components and unit control
box must be enclosed in field-supplied conduit. Follow all
local codes and NEC (National Electrical Code, U.S.A.). Wire
size must be no. 16 AWG (American Wire Gage) (1.5 mm
2
)
minimum. See Fig. 4 for field wiring.
30HX UNITS — Remove the screws holding the right-side
access panel to the unit control box. Remove the right-side
access panel and store in a safe area.
Route wires through field-supplied conduit and attach the
conduit to the unit control box, using a suitable conduit fit-
ting and one of the available
7
⁄
8
-in. knockout openings. At-
tach the other end of the conduit to the solenoid valve, using
a suitable fitting. Repeat for the other circuit.
30GX UNITS — Install the accessory junction box included
with this kit in the position shown on the 30GX chiller in
Fig. 3. Route the waterproof conduit included with this kit
between the accessory junction box and the factory-installed
junction box. See Fig. 3 and 4. Route field-supplied conduits
from the solenoid valves to the accessory junction box.
ALL UNITS — Using good wiring practice, connect a white
wire from the solenoid valve on circuit A to a white wire
from the solenoid valve on circuit B. Connect both wires to
the white wire in the factory-installed junction box (30GX),
or unit wiring harnesslabelled ‘‘MLC-A& B’’(30HXA, HXC).
Connect a pink wire from the solenoid valve on circuit A
to the pink wire in the factory-installed junction box (30GX),
or unit wiring harness labelled MLC-A (30HXA, HXC).
Connect a gray wire from the solenoid valve on circuit B
to the gray wire in the factory-installed junction box (30GX),
or unit wiring harness labelled MLC-B (30HXA, HXC).
Figure 4 shows the correct wiring for the minimum load
control and the location of the wiring connection points on
the chiller.
Fig. 3 — Installing Valves, 30GX
4