Operating The Control - Honeywell ZG 215VN Operation And Putting Into Service

Operating the Control

The ZG 215VN can be used at choice for the control of an
air-handling system's constant discharge temperature (left-
hand system diagram) or a floor heating's constant flow tempe -
rature (right-hand system diagram).
The VF/LF temperature sensors monitor constantly the actual va-
lues and transmit these values to theZG control unit. Should the "
temperature or the supply temperature deviate from the target va -
lue, the controller commands the VM servo motor to adjust the
ZR/DR mixing valve.
The mixing valve performs the necessary change to the mixing ra -
tio between the heated supply water and the heating circuit's retur -
ning cooled water.
The TW temperature selector is used as remote control. By means
of the P2 selector knob the flow or supply temperature can be mo -
dified. The temperature selector is not absolutely necessary in
functional terms, but it makes the operation easier.
The FT frost protection thermostat (air-handling system only)
works independently from the control unit and protects the air hea -
ter against freezing.