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override is still allowed but for a duration of one (1) hour (unoccupied mode). The system will
remain in the TEMPORARILY SUSPENDED mode until the programmed time and date is
reached.
5.2.3 FACTORY DEFAULTS
The SZP control module is shipped with the following program settings:
•
All temperature setpoints set at: ...Heat: 68°F(20°C)
•
All schedule times set at: ..............12:00A
5.3
USER OPTIONS
The SZP control module allows the user to set the time of day display in 12 or 24 hour format.
The user also may set the temperature display in Celsius or Fahrenheit. These settings do not
affect the thermostat displays.
5.4
HVAC OPTIONS
The SZP control module allows the installer to establish the following system parameters:
HEAT/COOL OR HEAT PUMP SYSTEM
The SZP module can control up to four (4) stages of heating and three (3) stages of cooling in
the heat/cool mode and three (3) stages of heating and three (3) stages of cooling in the heat
pump mode.
In the heat pump setup, W3 terminal is used for the auxiliary heat, even when a single
compressor is used. The emergency heat mode becomes available as one of the modes of
operation. When emergency heat is selected, W3 terminal will cycle on demands for heating
and W4 terminal will be on continuously.
NUMBER OF STAGES OF HEATING AND COOLING AND NUMBER OF ZONES REQUIRED
TO ACTIVATE EACH STAGE
Upstaging and downstaging is based strictly on the number of zones calling. Downstaging will
also occur when the high and low limits are exceeded.
MINIMUM HEATING AND COOLING ON AND OFF TIMES
The system allows input of different minimum ON and OFF times for heating and cooling.
CONTROL METHOD: TIMESHARE OR DIFFERENTIAL
The SZP control module has two methods of determining which equipment calls to service first
(heating or cooling) and when to changeover to the opposite equipment. The two control
methods, timesharing and differential, are described in section 5.5.
THE MUST-SERVICE ZONE
The Must-Service zone uses an intelligent weighting protocol which gives a status to the zone
such that a call from this zone equals the number of zones required to activate the first stage
of that mode. For example, if three (3) zones are required to call for activating first stage
heating, a call from the Must-Service zone will be given a weight of three (3) to simulate three
(3) zones calling. From this point, the control module will process this call and determine if the
zone is to be serviced based on the timesharing or differential control methods. The Must-
Service zone is not given any other special status.
HIGH AND LOW TEMPERATURE LIMITS
The limits are entered at the SZP control module and stored in the SZEM module memory.
HIGH AND LOW BALANCE POINTS
These values are used to determine when the auxiliary heat terminal should be disabled (high
balance point) and when the compressor terminal should be disabled (low balance point).
SlimZone Premier
Cool: 73°F(23°C)
15
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