System 2000 AUTO TEMP
2
3. Warnings
Warning!
When this system is used in a life support heating and ventilation system
where failure could result in loss or injury, the user should provide
adequate back-up, or accept the risk of such loss or injury.
Warning!
Electrical shock may occur if the Auto Temp is opened with power
connected to the unit. Before opening the enclosure, make sure that all
power sources to panel, and each stage, are disconnected.
Warning!
Wiring and connections must comply with all national and local electrical
codes. Installation by qualified electrician required.
4. Description of Controller
The Hired-Hand System 2000 Auto Temp Controller is a 12 relay, on/off, temperature/timer actuated,
staged controller. The controller also features 7 temperature inputs. The System 2000 offers several
unique and useful features. One such feature is that the Auto Temp can be programmed to control up to 6
separate rooms. Each room can have its own target, ramp, and timer. Any stage can be programmed to be
either heat or cool, and can be assigned to any room. Also, any of the 12 relay stages can be programmed
to use any single, or any averaged combination of temperature sensors to operate. The controller operates
off a single temperature set-point which is manipulated via the two buttons labeled
Target Temp
. The run-
time percentage of each room's timer is settable via the two buttons labeled
Runtime Percent
. The status of
the 12 stages is displayed on the face. A glance at the facepad will confirm whether a stage is on, whether
it is heat or cool, whether the stage is on a timer, and whether the function controlled by that stage is
actually running. All this information with push buttons and red lights -- the lights are on if a stage is on,
and are flashing if the stage is running. The stages are programmed using an offset/differential method.
This method is explained later in this manual.
It is not possible for both a heat stage and a cool stage to operate simultaneously by temperature in one
room. The reason for this is that the machine is always in either a heat mode, or a cool mode of operation.
If the system temperature (see
Setup System
section of
Program Features
) is less than the system target
temperature, then the machine is in a heat mode, whereas if the system temperature is equal to or greater
than the target temperature then the system is in a cool mode and cool stages may operate. Note, however
that any cool stage which is on the timer may operate regardless as to the mode of the system.
