Robertshaw DSL-520P, Installation And Operation Manual

Page: 15 / 35

12 SlimZone Premier
5. SYSTEM OPTIONS AND OPERATION
5.1 INTERACTION BETWEEN MODULES
The SZP control module is the central processing unit in the SlimZone Premier system and is
in constant communication with the DSL-520P zone thermostats and the optional SlimZone
Environmental module (SZEM). The following describes the interaction between the modules.
5.1.1 SZP CONTROL MODULE
The control module has global control of the system and establishes parameters such as
program temperature setpoints, schedules, and mode of operation.
EQUIPMENT CONTROL
The control module has full control of the HVAC equipment. It processes the zone requests for
heating, cooling, and fan and monitors the conditions reported by the SZEM module and
services the zones accordingly.
TESTING
All relay output terminals may be tested from the SZP control module via the Equipment Test
menu. All zone dampers may be activated as well as all zone perimeter heat relays. Bypass
dampers may also be tested from the control module.
PROGRAMMING
All system programming is done at the SZP control module. The module establishes the
temperature setpoints and the events the zone thermostats control. Temporary local override
is made possible by changing the setpoints at the zone thermostats. Refer to section 5.2 for
further programming information.
MODE OF OPERATION (Off, Cool, Heat, Auto, E Heat)
The control module establishes the global (system) mode of operation; local mode of operation
may be selected at the zone thermostats. Only calls for the modes established by the control
module will be serviced.
CONSTANT FAN
Global fan control is established at the control module. When set to constant fan (fan on) and
the system is idle, all zone dampers are opened to circulate air to all zones. When the global
fan control is set to auto, local requests for constant fan are serviced; dampers to zones not
calling for constant fan are closed. The G1 terminal is used for constant fan. Refer to section
5.4 for Smart Fan feature.
MINIMUM EQUIPMENT ON AND OFF TIMES (Short Cycle Protection)
Minimum equipment ON and OFF times are set at the control module for both heating and
cooling. Zone thermostats also have minimum ON time settings (2 or 4 minutes). The control
module ensures the equipment is not shut off until the thermostat and the module minimum ON
times have elapsed; timers run concurrently. Minimum OFF time is established by the control
module.
DATA EXCHANGE: SZP CONTROL MODULE / DSL-520P ZONE THERMOSTAT
The SZP control module provides the following information to the DSL-520P thermostats:
• temperature setpoints
• event (morning, day, evening, or night)
• time of day
• outdoor temperature (if SZEM module is installed with this option)