User Guide

PA03 – 4
Warm Weather Shut Down (WWSD) (DIP switch 4)
When the outdoor temperature is warmer than 70°F, the 00-VR and system pump turns off and
ignores any heat request.The WWSD LED turns on during warm weather shut down.This func-
tion may be turned on by setting the DIP switch 4 to the on position.
Minimum System Supply Temperature (DIP switch 5)
A minimum system supply temperature may be set on the 00-VR. This function is selectable by
turning on DIP switch 5. Even though the reset ratio strategy requires a lower temperature dur-
ing mild outdoor temperatures, the 00-VR will target a minimum of 85°F.This function is useful for
applications such as floor warming.
System Pump
The 00-VR is capable of controlling a system pump.Whenever a heat request is present and the control is not in WWSD,
the system pump contact (PMP) is turned on.The pump relay is rated for a maximum of 5 amps.
Exercising
During long periods of no operation, the 00-VR is designed to exercise itself and the system pump for 10 seconds every
3 days of no operation in order to prevent precipitate build-up in the pump.The % OUT LED turns on during the exer-
cising function. The 00-VR and system pump outputs are exercised sequentially in order to prevent uncontrolled heat
transfer to the heating system.
Pump Purge
Whenever the heat request signal is removed or the 00-VR enters WWSD, the 00-VR continues to operate for 20 sec-
onds at the last speed used.This function increases efficiency by injecting the stand by heat from the boiler loop into the
system loop.
345
On Off
70°F
45
On Off
85°F