Pump Operation In "Internal Time Clock" Mode; Locking/Unlocking The Keypad; Remote Control Operation; Remote Control Connected At Fireman Switch Terminal Block - Jandy LJ Installation And Operation Manual

Model LJ Pool and Spa Heater
When the controller is in the "External Time
Clock" mode, the PUMP key is disabled. Pressing the
PUMP key will temporarily show an "INVALID
COMMAND" message on the controller display.
7.4.2.2 Pump Operation in "Internal Time
Clock" Mode
To operate the pump using the internal time clock
of the controller, an optional pump relay, available
from your Jandy distributor, must first be installed (see
Section 6.4 "Pump Power Connection").
When the controller is in the "Internal Time
Clock" mode and "NORMAL" is shown on the
display, the pump will operate between the pro-
grammed "ON" and "OFF" times set for the pump time
clock on the LJ controller (see Section 7.2.5). The
display of the controller will show the time set for the
'Real Time Clock'. If power to the heater is lost at any
time, the controller will keep the last time or setting in
memory. When power is restored to the heater, all
settings will remain the same, but the real time display
will flash to indicate that a power loss has ocurred and
the time needs to be reset.
The pump can be turned off manually at any time
by pressing the PUMP key. If the heater is running
when the pump is turned off, the pump will go into
'COOL DOWN ' mode and continue to run for 5
minutes. If the heater was running within the last 5
minutes, the pump will continue to run for the time
remaining to complete a 5 minute cool down. The
'COOL DOWN' mode allows cool water to circulate
through the heat exchanger, removing residual heat
from the combustion chamber. When the pump is in
the 'COOL DOWN' mode, the controller will display
the 'COOL DOWN' icon just above the pump icon.
To turn the pump on at any time, press the
PUMP key. If the heater is in either the 'POOL' or
'SPA' mode, and the water temperature is less than
the pool or spa temperature setting the ignition se-
quence will begin.

7.4.3 Locking/Unlocking the Keypad

Once all of the limits have been set (see Section
7.2, "Setting the LJ Controller Functions and Limits")
you may choose to lock the keypad to prevent acci-
dental changing of the limits set. Use the following
procedure to lock and unlock the keypad.
1. Press the MODE key repeatedly until the icon
'°F/°C' appears at the top of the display screen.
2. Press the ENTER key. The temperature scale
indicator in the lower right corner of the display
will start to flash.
3.
4.
5.

7.5. Remote Control Operation

controller must first be set up in the "External Time
Clock" mode. The heater is shipped from the factory
in this mode.
the factory settings, convert the controller to "External
Time Clock" mode by setting the 'PROGRAM' (pump
time clock) 'ON' and 'OFF' times to run for 24 hours.
To set the LJ controller into "External Time Clock"
mode, set the 'ON' time for the 'PUMP TIME
CLOCK' to 12:00 AM and the 'OFF' time to 11:59
PM. Refer to Section 7.2.5, "Setting the Pump Time
Clock". When the pump time clock is set with these
limits, it allows the internal time clock of the LJ
controller to run the pump for 24 hours. This setup
allows the heater to be controlled by the remote input
through the Fireman's Switch connection.
connected to the heater. To connect a remote ON/
OFF type switch to the heater, remove the wire nut
from the two red leads of the wire harness that
connects to the Fireman Switch connection on the
power circuit board (see Figure 19). Connect the wires
from the switch to the leads on the wire harness. This
°F / °C
type of remote control will turn the heater on or off,
but will not switch between pool and spa settings or
allow for temperature adjustments. These functions
are still controlled at the LJ controller on the heater.
more functional remote control. Remote controls that
°F
provide their own temperature sensor such as the
Jandy AquaLink RS® remote control systems can be
Press the MODE key one more time. The icon
'ULC' (unlocked) or 'LC' (locked) will flash on
the display where the real time clock usually
appears.
Press the UP or DOWN key to toggle between
'ULC' or 'LC'.
Press the ENTER key to accept the choice and
return the controller to the NORMAL mode.
NOTE: Once the keypad is locked, any
attempted changes to the limits or functions of
the LJ controller will cause the LCD to
temporarily display an "Invalid Command"
message.
7.5.1 Remote Control Connected At
Fireman Switch Terminal Block
To connect a remote control system, the LJ
If the controller settings have been changed from
An interrupt (on/off) type remote switch can be
The LJ heater also accommodates the use of a
Page 27
ULC
LC
NORMAL