York YCUL0045E, Installation Operation & Maintenance

Page: 62 / 144

JOHNSON CONTROLS
62
FORM 150.63-NM8 (1020)
UNIT CONTROLS
The Low Battery Warning can only occur at unit
power-up. On micro panel power-up, the RTC battery
is checked. If a low battery is found, all programmed
setpoints, program values, options, time, schedule, and
history buffers will be lost. These values will all be reset
to their default values which may not be the desired op-
erating values. Once a faulty battery is detected, the unit
will be prevented from running until the PROGRAM key
is pressed. Once PROGRAM is pressed the anti-recycle
timers will be set to the programmed anti-recycle time to
allow the operator time to check setpoints, and if neces-
sary, reprogram programmable values and options.
If a low battery is detected, it should be replaced as
soon as possible. The programmed values will all be
lost and the unit will be prevented from running on the
next power interruption. The RTC/battery is located at
U5 on the IPU2 Board.
! ! L O W B A T T E R Y ! !
C H E C K P R O G / S E T P / O P T N