PTAC-SVX004A-EN
19
Common
R
W
Y
O
GH
GL
C
Energy
Management
(24 Vac)
• R; 24 Vac
• W; Electric Heat
• Y; Compressor
• O; Reversing Valve (Heat Pump Unit Connection
Only)
• GH; High Fan
• GL; Low Fan
• C; Common (Typically for Digital Thermostats)
NNoottee:: Any incorrect input combinations are
captured as thermostat wiring failures and
will light the STATUS LED indicator on main
board.
5. Reinstall terminal connector.
6. Ensure that unit is configured for wall thermostat
enable. See Table 5, p. 16 (DIP switch setting for
wall thermostat).
7. Replace control panel label with control panel
guard.
8. Power-up the unit.
GGeenneerraall NNootteess::
• Anytime there is a second-stage call for heating
from the wall thermostat,, the unit automatically
switches over to electric heating for heat pump
models.
• For thermostats with two (2) fan speed output (such
as Low fan or Hi fan), the fan speed is determined
by how the terminal connector is wired. When
using Low fan speed, wire the GL output from the
thermostat to GL on the terminal block. When using
Hi fan speed, wire the GH output from the
thermostat to GH on the terminal block.
.
Energy Management Input
(Front Desk Control)
The controller can handle a switch signal from remote
energy management input, called an EM signal or front
desk control. The input must be 24 Vac. When the
system receives a 24 Vac signal, it turns OFF the unit;
otherwise it is in normal control. This function is
disabled under Freeze Guard protection.
Intelligent Self-Checking Control
The PTAC has an on-board computer continuously
checks key components of the unit to ensure they are
operating properly. Under normal operation, the unit
status indicator (STATUS, on main PCB), light is
steadily ON. If there is a major problem, the unit shuts
down and displays a diagnostic failure code on the
control. If it is a minor error and the unit can correct it
by itself, the diagnostic code is flashed on the status
LED that is easily seen when the front panel is
removed. Refer to the following table of diagnostic
codes.
NNootteess::
• When using a room thermostat, diagnostic
codes are not viewable. These codes are
only viewable on the unit control board.
• After the compressor cycles three times the
F0 code can appear if the refrigerant charge
is low.
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