Honeywell TOTALZONE TZ-3 - Manual (Page 10)

TZ-3 TOTALZONE® ZONE CONTROL PANEL
68-0223-2 10
OPERATION
Sequence of Operation
On a call for heating or cooling, the zone damper stays open
to the calling zone, and the dampers close to the zones that
are not calling. The TZ-3 panel brings on the heating or
cooling and conditioned air is delivered to the calling zone
until that zone is satisfied. When the call is satisfied, the
system enters the Purge mode. This holds open the damper
of the last zone calling and purges into that zone. The purge
time can be set to three and one-half or two minutes. After
purge, all dampers return to the Open position.
Any zone thermostat can call for heating or cooling. If there
are co-existing calls for heat and cool, the panel first accepts
the first call. Once that call is satisfied, or a maximum of 20
minutes has elapsed, the panel switches to allow the opposite
call.
On a call for heating or cooling, the heat LED illuminates red
or the cool LED illuminates green. The zone damper LED
turns green for the zone calling, and the dampers in the zones
not calling close and turn red. As AOBD dampers move, the
LEDs turn amber.
Purge Mode
At the end of every call for heat or cool, the panel enters a
Purge mode that holds open the calling zone damper for three
and one-half or two minutes. During this time, the panel or the
HVAC equipment can operate the fan. Purge also serves as a
time delay to prevent short cycling of the heating and cooling
equipment after each call. Purge LED lights to signal that the
system is in the Purge mode. Pressing the purge override
button for two seconds overrides the Purge mode. Unless
there is a new call for heat or cool during the Purge mode, all
dampers are moved to the Open position at the end of purge.
Individual Zone Fan Control
When all zones are satisfied, the Fan switch of each
thermostat controls the fan operation for that zone. When the
Fan switch is in the On position, the fan is energized, and the
dampers close to zones where the Fan switch is in the Auto
position. If there is a call for heat or cool during this time, the
circulation mode ceases, and the heat or cool call is honored.
When the zone calling is satisfied, the circulation call
resumes.
Single and Multi-Stage Operation
The panel can control up to three stages of heating and two
stages of cooling. The first stage is energized by the
thermostat. The second stage of heating is brought on by the
thermostat, timer, or number of zones calling. The third stage
of heating is brought on by the timer or number of zones
calling. The second stage of cooling is brought on by the timer
or number of zones calling.
The following instructions show how to configure the panel for
stage control.
If the equipment is single stage, set the DIP switches as
follows:
1st Stage by Thermostat, 2nd and 3rd Stages by
Timer (Fig. 18)
The thermostat controls the first stage of heat or cool. If the
call is not satisfied by the first stage within the time set on the
timer, the panel energizes the second stage. If the call for heat
is not satisfied by the second stage within the time set on the
timer, the panel brings on the third stage.
Set the DIP switches as follows:
Fig. 18. Stage timer.
1st Stage by Thermostat, 2nd Stage Heat by
Thermostat
The thermostat controls the first stage of heat or cool and the
second stage of heat. The timer controls the second stage of
cool and third stage of heat. If the first and second stages
combined do not satisfy the heat call within the time specified
on the timer, the panel brings on the third stage of heat.
Set the DIP switches as follows:
DIP Switch
Number Status Purge Time
3 Off 3.5 minutes
3 On 2 minutes
DIP Switch
Number Status Fan Control
4 Off Panel control of fan
in purge
4 On HVAC control of fan
in purge
DIP Switch Number Status
1 Off
5 Off
DIP Switch Number Status
1 Off
5 Off
15 MINUTES
10 MINUTES
5 MINUTES
20 MINUTES
25 MINUTES
30 MINUTES
STAGE TIMER M19078