ENVI
®
Control
3
1.0
ENVI
®
BOILER CONTROL
The ENVI
®
boiler control consists of 3 components and is an intelligent control system with advanced features such as text-
based display, MODBUS® communication capabilities, and boiler sequencing. Firing rate and setpoint can be controlled
via an external 0-10VDC analog control signal. Errors are date and time stamped, and the control records burner run time
at various operating points. A single integral control for temperature control, flame safeguard, firing rate control, blocked
flue protection, outdoor air reset, freeze protection, built-in cascade sequencing and more. Throughout this manual and in
the ENVI
®
controller
the term “Hysteresis” is used with the meaning of “Differential”.
The ENVI
®
control is capable of accepting building management control via 0-10VDC and MODBUS®.
Other languages
require the use of a Protocol converter which is also available separately from your Patterson-Kelley representative.
ENVI
®
APPLICATION
Note: The ENVI
®
control is capable of running the boiler on its own without any external control hardware or accessories.
However, certain applications warrant the purchase and installation of separate sensors such as:
26-0000-0507
Outdoor air sensor
BP-0000-0279
Well and sensor for header and DHW applications ENVI
®
Control
23-0000-0539
Surface mount strap on sensor kit for header or DHW applications ENVI
®
Control
BP-0000-0480
Kit, 12” brass thermowell, tank temperature sensor, DHW applications ENVI
®
Control
10-0510-0642
Dual element immersion sensor
Optional flow switch: (necessary in some DHW applications)
86-8350-0800
Switch, flow switch
Optional aquastat: (necessary in some DHW applications)
10-0000-1209
SW,THERMO,100-200F,HONEYWELL_L6008A1242
23-0000-0233
THERMOWELL
, ½” NPT
These optional sensors will enhance the performance of the ENVI
®
control and may be necessary to sense the locations
needed for some applications to perform properly.
