5
5.
Start the circulator:
Note:
When power is applied to the circulator it will go through a 10 second diagnostic delay before starting. The LCD will illu-
minate for 15 seconds with factory pre-set Delta-T mode and 20°F
∆
T settings. Press any button to illuminate the LCD for 1
more minute.
It is recommended to run the circulator at full speed for a minimum of 5 minutes when purging the system to remove remaining air from
the bearing chamber. This is especially important when installing the circulator in the off-season.
Full Speed Over-Ride Feature:
To run the pump at full speed during the fast fill, start-up and purge process, press and hold the
UP
button for 3 seconds. “Full Speed
Override” will appear on the LCD display. To return to the programmed, normal operating mode, press the
SET
button.
6.
Programming your VT2218 circulator:
Note:
The VT2218 is factory-programmed for
Delta-T
operating mode with a
20°F
temperature differential setting. If this is your
desired operating mode and Delta-T setting, no programming changes are required.
CAUTION: Never run the circulator dry or permanent damage may result.
ATTENTION: Ne laissez jamais le circulateur tourner à sec, des dommages permanents peuvent en résulter.
The VT2218 has 5 Operating Modes:
• Delta-T - Varies speed to maintain a fixed temperature differential (factory pre-set mode).
• Constant Speed - 4 fixed speeds (see pump curves on previous page to select desired performance).
• Set Point Heat - Increases speed to increase temperature (includes Boiler Protection option).
• Set Point Cool - Increases speed to lower temperature.
• Boiler Protection - Varies speed to maintain minimum boiler return temperature.
Across a Series
Loop System Using
Zone Valves
M
M
Return
Sensor
M
Across Multi-Zone
Radiant Manifolds
with Loop Actuators
iS
erie
s-R
B
C
A
B
C
A
M
M
M
M
M
M
M
M
Outdoor
Sensor
Boiler
Sensor
Supply
Sensor
Supply
Sensor
Return
Sensor
Boiler
Return Sensor
Boiler Protection By-Pass
Duct
Supply
Sensor
Fan Coil Fixed Temperature
Typical Variable Speed Applications:
Supply
Sensor
Boiler Return
Sensor
Mixing
Radiant Injection Set Point with Boiler Protection Option
• Delta-T
- Varies speed to maintain
a constant temperature
differential (
∆
T)
• Set Point Heat
- Varies speed to maintain
a fixed temperature
• Boiler Protection Option
- Decreases speed to protect
boiler from low return water
temperature and flue gas
condensation
• Boiler Protection
- Increases speed to protect boiler from low return
water temperature and flue gas condensation
• Heating or Chilled
Water Cooling
• Set Point Heat
- Decreases speed
on temperature rise
• Set Point Cool
- Increases speed on
temperature rise
