Page 24
31-5000751 Rev. 0
Outdoor Unitary Control
Jumpers and Terminals
RAST TERMINALS FOR
THERMOSTAT WIRING
CONNECTION
CHARGE MODE AND
OPERATION MODE
JUMPER DETAIL
PUSH BUTTON
7 SEGMENT
DISPLAY
OPERATION
MODE
JUMPER
CHARGE
MODE JUMPER
(CHRG MODE)
Figure 14.
7-Segment Display and Push Button
Information labels concerning the outdoor control
7-segment display and push button operations are
available on the unit control panel cover.
Alarms
Alarm information is provided on the unit control panel
cover.
Programing Unit Type
Programming to the appropriate tonnage allows the unit to
operate in the range of compressor and fan speeds that
are optimized for best unit performance and efficiency.
The NS18HM units are programmed from the factory to
function in 3 Ton and 5 Ton modes of operation. If the
intended capacity for the application is 3 or 5 Ton, skip this
section.
The units are field convertible to 2 Ton or 4 Ton to efficiently
perform for the required application. If the intended capacity
is 2 or 4 Ton, proceed to the following steps to program the
unit type. Outdoor unit must be powered ON and in idle
mode (no heating or cooling mode of operation).
NOTE:
The -36 unit can be programmed to operate as a
2 Ton, and the -60 unit can be programmed to operate as
a 4 Ton.
Perform the following steps to program the unit type.
1.
To enter mode options, push and hold the push button
next to the seven-segment display until a DASH (-)
symbol appears. Immediately release the button. Once
the dash starts blinking, proceed to the next step.
_
2.
Push and hold button again until
PU
is displayed on
the seven-segment display. Immediately release the
button.
PU
3.
Push and hold button until the code for the correct unit
type is displayed.
Unit Code
Unit Type
58
2 Ton
60
3 Ton
62
4 Ton
63
5 Ton
Table 8. Unit Tonnage Codes