Robertshaw DSL-520P - Manual (Page 5)

FAN Button
This button allows selection between constant fan or auto fan mode. The constant fan
mode continuously displays the ' symbol; auto fan mode means that the fan only
activates when heating or cooling equipment has been activated; the ' symbol
does not appear when the fan is activated during a call for cooling or heating.
1. Press and release the FAN button until the desired fan mode has been selected.
2. Constant fan mode is recommended for electronic air cleaners and constant ventila-
tion requirements.
OUTDOOR Button
This button allows the thermostat to display the outdoor temperature, if the SlimZone
Environmental Module (SZEM) has been installed with an optional outdoor remote
temperature sensor. (Refer to section 4.6 for ZSEM module information.)
1. Press OUTDOOR button; the ✜ icon is displayed, along with the outdoor tempera-
ture just below. If there is no remote sensor connected the temperature display will
show - -.
2. Release the OUTDOOR button; the thermostat will again display the indoor temperature.
ZONE Button
Pressing the ZONE button displays the zone number where the thermostat is located
and indicates to which input it is connected to on the SZP control module.
17
DSL-520P ZONE THERMOSTAT
INTRODUCTION
The nonprogrammable DSL-520P zone thermostat is the exclusive thermostat used with the
SlimZone Premier (SZP) system. The system will not function with any other thermostat.
The DSL-520P is a fully communicating thermostat which is powered by the SZP control mod-
ule and is constantly exchanging data with the control module to optimize control of the zoned
environment. It represents the most advanced solid-state, microprocessor temperature control
on the market today.
The thermostat has been designed to provide accurate control and display of room temperature,
and normally displays room temperature, mode of operation and whether cooling or heating is
currently on.
Your new thermostat uses an adaptive control routine, based on Fuzzy logic, to determine the
heating or cooling load of the area in which it is installed. The routine calculates the load by
evaluating recent room conditions (from the sensor within the thermostat or connected remote
sensor ) and reactions to heating and cooling. The load factor is then used to determine when
your equipment should be activated and for how long, providing optimum control and econo-
my.
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