HEAT COMPUTER 3700 (3500 main board plus optional add-on boards plus 3700 software)
For mid-size apartment and commercial buildings.
Temperature Control
Thermostatic control based on apartment and outside temperatures.
The apartment sensors can be hardwired or wireless: up to 20 sensors for a single-zone system and up to
10 sensors per zone for a two-zone system. The decision on whether to give heat is based on how many
apartments are voting for heat. There are separate temperature setpoint controls for residential and
commercial zones. The residential zones have seven temperature setpoints per day. The commercial zones
have two temperature setpoints per day with a 7-day clock and programmable holiday override.
Boiler Control
Boiler control for common types of steam and hot water boilers.
Control types:
On/off burner control (1-4 stages steam, 1-6 stages hot water),
Staging control for low/high/low burners (1-2 burners steam, 1-3 burners hot water),
Modulation control for fully modulating burners (steam systems only, 1-2 burners).
Based on:
Steam: Header pressure for one or more boilers,
Boiler temperature (aquastat) for one or two boilers (with a programmable night-time set back).
The header pressure control includes a segmented (compound) outdoor reset curve that allows the user to
specify the header pressure at the following outdoor temperatures: 5, 20, 35, 50 deg. F.
Hot water: Primary loop supply temperature. Lead/lag: For 1-2 burners: rotating lead, fixed lead #1,
fixed lead #2. For 3 or more burners: rotating lead, fixed lead, rotating lead with last stage fixed.
Zone Control
Zone control for one or two steam or hot water zones.
Steam: The steam zones can be on/off or variable vacuum. The variable vacuum includes a segmented
(compound) outdoor reset curve that allows the user to specify the percent of valve opening at the
following outdoor temperatures: 0, 10, 20, 30, 40, 50, 60 deg. F.
HotWater: The hot water zone control includes a segmented (compound) outdoor reset curve that
allows the user to specify the zone supply temperature at the following outdoor temperatures:
0, 10, 20, 30, 40, 50, 60 deg. F.
DHW Monitoring
Monitoring (but not control) of coil hot water and domestic hot water temperatures.
Alarms
Eight alarms that can dial-out or e-mail the user. Two of the alarms are user-defined external alarms
that can be connected to flood detection or other common devices that provide a compatible signal.
Communications
Choice of web or dial-up interface. Both give: A real-time connection to the Heat
Computer, Detailed operating reports and Point and click programming. The web interface provides:
Additional problem detection capabilities (both on-screen and by e-mail), Easy access to previous
building history and A quick way to switch all of a customers buildings from winter to summer operation
(or vice versa).
Water Meters
Two water meters, one of which can record in 15 minute increments.
Stack or Oil Tank Level
Either the stack (chimney) temperature or the oil tank level.
Local Operation
On/auto/off key switch. Easy push button switch on the front panel to select summer/winter operation.
Data reporting and programming via the front panel display.
Data reporting and programming via a local port (RS232) computer connection.
