Lighting Controls Blue Box LT Series Installation, Operation & Maintenance Manual page 48

48 THE BLUE BOX LT PARTS REPLACEMENT & INSTALLATION GUIDE
LC&D recommends that any suspect circuit be fault-
checked prior to re-energizing .
RELAY REPLACEMENT AND INSTALLATION
To remove a defective relay:
1 . Switch off all breakers feeding relays and the
transformer in the Blue Box LT .
2 . For master panels: Unscrew and open the hinged
display-panel door to expose the high-volatge section .
3 . Remove the screw and lockwasher fasteners that
hold the line/low voltage barrier over the relays .
4 . Pull off the low voltage jumper that connects the relay to
the control card (LT 4 & 8) or the smacker strip (LT 16) .
5 . Loosen the LINE and LOAD connection lugs on
the relay and remove the conductors . [Note: For
safety reasons, use a wire nut to tie the two wires
together]
Line Lug
Removal Slot
Load Log
Low voltage connector pins
Screw/ Lockwasher
fasteners
Relays
Low Voltage jumper
connector
Line/Load Connection
lugs
line/low voltage
barrier
6 . Pry the relay out of the plastic track by applying a
flat-blade screw driver to the slot located at the
relay card's edge near the line and load lugs .
To replace a defective relay
7 . Push the replacement relay back into the track
until it "snaps" securely in place – use a flat-blade
screw driver to snap in one or both ends .
8 . Reconnect the low voltage jumper between the
relay and the relay driver pins on the control card
(LT4 and LT8) or the smacker strip (LT16) .
9 . Re-install the line/low voltage barrier and the screw
and lockwasher fasteners . If necessary, break out
the "break-away" tab(s) (one for each new relay)
on the voltage barrier for the replacement relay(s) .
10 . Reconnect Line and Load conductors to the
connection lugs .
11 . For master panels: Close and screw down the
hinged display-panel door .
12 . After the defective part replacement installation
is complete, return the part using the prepaid
USP return label and envelope to LC&D .
[Note: If the defective part is not returned within a
30-day period, your account will be automatically billed
for the part. ]
To exercise and test the replacement relay:
13 . Switch the breakers powering all the relays and
the transformer back ON
14 . Navigate on the DTC to USER MENU >
MANUAL OVERRIDE and TAB or SCROLL to
the correct LCP and Load (relay) and ENTER to
exercise the relay by switching it on and off 3 or 4
times . If possible, listen to hear the relay contacts
clicking as they open and close .
MANUAL CONTROL AU
LCP-1 LOAD-1
1- 3■ 5■ 7■ 9- 11- 13- 15-
2- 4- 6- 8■ 10- 12- 14- 16-
SCROLL to select LCP
TAB to LOAD
SCROLL to select
LOAD
ENTER to toggle
status