YORK INTERNATIONAL
116
FORM 100.50-NOM1 (604)
Service
SECTION 8 – SERVICE
The eco
2
rooftop Primary Unit Controller (Primary
Unit Controller) is a fac to ry-mounted con trol ler that
uses a microprocessor-based control. The controller
is housed inside the low-voltage compartment of the
control/power panel. The main controller is located in
the control side (right side) of the panel and is shown
in Figure 48.
The main controller will be referred to as the Primary
Unit Controller and is factory mounted on every unit.
The Primary Unit Controller interfaces to a possible 16
binary inputs, 13 an a log inputs, 10 binary outputs, and
6 analog outputs, that are used to control the rooftop
unit.
The connection “layout” for the IO (inputs/outputs) is
shown in the Primary Unit Controller connection map
in Figure 49. No tice that the
Þ
gure shows the Jack con-
nection des ig nat ed by “J”, and the pin number located
on the inside of the board diagram. The input or output
designations are shown on the outside of the
Þ
gure.
Table 32 lists the description of the various inputs and
outputs, and the respective connections.
Figure 50 shows the Primary Unit Controller architecture
as it re lates to the on-board relays for the binary outputs
and the associated LED’s, the location of the binary input
LED’s, and LED’s for the Ethernet port, RS-232 port,
the N2 port used for communication to the Secondary
Controller only, and a Alarm LED for the Primary Unit
Controller. A solid or
ß
ash ing Alarm LED indicates a
problem with the Primary Unit Controller – contact your
local York service of
Þ
ce for service.
The respective on-board binary output relay LED will
be illuminated when the relay is being energized by the
Primary Unit Controller. The various communication
port LED’s will “
ß
icker” when communication is pres-
ent. Figure 50 illustrates the binary input LED’s and
des ig na tions.
FIG. 48 –
PRIMARY UNIT CONTROLLER
00636VIP
