Install Instructions

Sequence of Operation
Power Up and Heat Request
Whenever the control is powered up, the green PWR LED turns on. The 00-VR starts operating once a heat request signal is present
at the Heat Request (Ht Req) terminals. A heat request signal may be provided by external end switches from zone valves or ZVC/SR
Zone Controls, applying a dry contact closure or a powered 24 V (ac) signal across the Ht Req terminals. If end switches or switching
relays are not available, a jumper must be installed to provide a heat request. Once a heat request is present, the HEAT REQ LED
turns on.
Reset Ratio
Once a heat request is present, the control turns on the system pump (PMP) contact and operates the injection
pump to provide outdoor reset at the supply sensor location. The percent output (% OUT) LED flashes at different
rates based on the speed of the pump. As the % OUT LED flashes faster it indicates a faster speed of the pump.
A fully on LED indicates the pump is at 100% capacity. The control targets a supply temperature based on the
outdoor temperature measured and the reset ratio (Curve) dial setting. The reset ratio is set using the following
formula:
Maximum System Supply Temperature (DIP switch 1 & 2)
The 00-VR has a maximum supply function used to set a maximum supply water target tem-
perature. The maximum temperature is selected using DIP switches 1 & 2. Select the desired
Maximum System Supply temperature based on the DIP switch settings shown.
If the actual supply water temperature approaches the maximum system supply, the control
reduces the speed of the injection pump and the reduced output (RED. OUT) LED is turned on.
This function may be disabled by setting the DIP switches 1 & 2 to off.
Minimum Boiler Return Temperature (DIP switch 3)
The 00-VR includes a boiler protection function which minimizes low temperatures back to the boiler. When-
ever the boiler sensor is installed and a heat request is present, the 00-VR monitors the boiler return tem-
perature and backs off the pump speed when the return temperature is near the minimum setting. The
minimum setting is selected via the DIP switch 3. When the switch is turned on, the minimum temperature is
set to 120°F and when the DIP is turned off the minimum is 135°F.
When using low temperature boilers such as condensing or electric, the boiler minimum temperature may be
disabled by powering up the control without a boiler return sensor connected.
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 function 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 during 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 exercising 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 seconds at the last
speed used. This function increases efficiency by injecting the stand by heat from the boiler loop into the system loop.
1/3
1/5
1/7
1/9
2/1
2/3
2/5
2/7
2/9
3/1
3/3
DVSWF
345
Po
Pgg
231!G 246!G
23
Po Pgg
221!G
23
Po Pgg
241!G
23
Po Pgg
261!G
23
Po Pgg
Opof
456
Po Pgg
81!G
56
Po Pgg
96!G
Reset Ratio =
Design Supply Temperature - 72°F
72°F - Design Outdoor Temperature
3