The HZ221 TrueZONE panel contains an LED display that communicates system and zone status. The LEDs indicate
the following information.
Table 5. LED Operation.
Solid when in heat.
Blinking when DATS temperature exceeds 120°F
(49°C) and calling for heat pump only.
Blinking when DATS temperature exceeds 160°F
(71°C) and calling for heat pump and auxiliary
heat. At 150°F (66°C), auxiliary heat is disabled.
Solid when in cool. Blinking when 45°F (7°C) DATS
low limit mode has been reached.
Solid when in operation.
Solid when in purge (lasts 2 minutes at power-up
and after a call for heat or cool). Blinking when the
DATS sensor has failed, or the wires are shorted or
open. Will blink for 3 minutes at power-up if DATS
is not present.
ZONE 1, 2
Solid green when open or opening.
Solid red when closed or closing.
Blinking amber when there is a damper or thermo-
stat short circuit (circuit breaker trip).
Solid when in Em Heat mode.
2 Zones, 2H/1C
Flashing Heat LED
Flashing Cool LED
Flashing Purge LED
Em Heat LED
Em Heat Mode
Green - Open
Red - Closed
Flashing - Short
Zone 1 _______________________
Zone 2 _______________________
Technical Support: 1-800-828-8367
50031314-001 Rev. A
Much of this information is also listed on the label on the
inside of the HZ221 cover.
When the zone panel cover is off, the EMERGENCY HEAT/PURGE OVERRIDE button
When the panel is in Purge (at startup or after a call for heat/cool), pressing this but-
ton stops the Purge, which saves time during installation or troubleshooting.
All other times, pressing the button puts the zone panel into Em Heat mode so that
all calls for heat are handled by the auxiliary heat.