HZ221 TrueZONE
5 69-2200—03
The HZ221 TrueZONE panel contains an LED display that communicates system and zone status. The LEDs indi-
cate the following information.
OPERATION
HZ221
HEAT
COOL
FAN
PURGE
ZONE 1
ZONE 2
EM HEAT
M28239A
LED display.
Table 5. LED Operation.
LED
Description
HEAT
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.
COOL
Solid when in cool. Blinking when 45°F (7°C)
DATS low limit mode has been reached.
FAN
Solid when in operation.
PURGE
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 short-
ed 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 ther-
mostat short circuit (circuit breaker trip).
EM HEAT
Solid when in Em Heat mode.
HZ221
2 Zones, 2H/1C
LED Status
Heat LED
Heating Mode
Flashing Heat LED
High Limit
Cool LED
Cooling Mode
Flashing Cool LED
Low Limit
Purge LED
Purge Mode
Flashing Purge LED
Sensor Failure
Fan LED
Fan On
Zone LEDs
Green - Open
Red - Closed
Flashing - Short
Zone Names
Zone 1 _______________________
Zone 2 _______________________
Technical Support: 1-800-828-8367
customer.resideo.com
Patents Pending
50031314-001 Rev. A
M28240A
Em Heat LED Em Heat Mode
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 but-
ton is visible.
When the panel is in Purge (at startup or after a call for heat/cool), pressing this
button 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.
M24741A
M1
M4
M6
R
C
W
Y
G
M1
M4
M6
R
C
W
Y
G
M1
M4
M6
R
C
W
Y
G
Rh
Rc
W
Y
G
HZ311
HEAT
COOL
FAN
PURGE
ZONE 1
ZONE 2
ZONE 3
ZONE
1
DAMPER
THERMOS
TA
T
R
C
DATS
DATS
EQUIPMEN
T
POWER
SENSOR
ZONE
3
DAMPER
THERMOS
TA
T
ZONE
2
DAMPER
THERMOST
AT
PURGE OVERRIDE
EMERGENCY HEAT
