To change operating mode and settings:
a. Press and hold the
SET
button for 3 seconds until the operating mode on the
LCD begins to flash.
b. Use the
UP
or
DOWN
buttons to scroll through the 5 operating mode options.
When the desired mode flashes on the LCD, press the
SET
button. The LCD will
begin to flash either temperature or speed setting options, whichever applies.
c. Use the
UP
button to increase temperature or speed settings. Use the
DOWN
button to decrease temperature or speed settings. When the desired setting
flashes, press the
SET
button.
d. Your programming is complete and the operating mode and setting will appear
on the LCD screen.
US or Metric Units
The VT2218 can be programmed to display in either US or Metric units. The default is US units. To change units to Metric, use
the programming steps above to scroll to
SETUP MODE
. Press
SET
and the default US units will begin to flash. Press the
DOWN
button to change to Metric. The
UP
button will change back to US units. When the desired units are flashing, press the
SET
button.
7. Reading the LCD screen:
The LCD screen will display important diagnostic information:
Operating Mode
- Delta-T, Constant Speed, Set Point Heat, Set Point Cool, or Boiler Protection.
Setting
- Delta-T target, Fixed speed, Set Point target temperature, or Boiler Protection target minimum temperature.
Watts
- Power usage of the circulator.
GPM
- Flowrate through system.
S
-
Supply
sensor temperature.
R (or BP)
-
Return
sensor temperature (or
Boiler Return
temperature in Set Point mode).
8. Sequence of Operation - How the VT2218 Works:
Delta-T Mode (5°F - 50°F, default = 20°F)
In Delta-T mode, the VT2218 will start at the lowest speed. If it reads a temperature differential (∆T) LESS than its target, it will
gradually increase speed through a 3 minute “Start Cycle” to its highest speed, until target ∆T is reached. “Start Cycle” will dis-
play on the LCD screen in place of “Watts”. If ∆T is GREATER than target, the pump will immediately go into Variable Speed
operation and vary speed to maintain the target ∆T.
Constant Speed Mode (Speeds 1, 2, 3, 4, default = Speed 4)
In Constant Speed mode, the VT2218 will always start and run at the pre-set Speed Level (1 through 4). Only watts will be dis-
played. Temperature sensors are not active in this mode.
Set Point Heat Mode (with Boiler Protection (BP) option) (50°F - 220°F, default = 105°F, BP default = 140°F)
In Set Point Heat mode, the VT2218 will start at the lowest speed. It then immediately switches to Variable Speed operation,
increasing speed to raise temperature or decreasing speed to lower temperature and maintain the Set Point Heat target.
If Boiler Protection (BP) option is used with Set Point Heat, the return sensor (R) will over-ride the supply sensor (S) and slow
the pump down if boiler return water temperature falls below BP target (for example 140°F). Once the return sensor reads BP
target, the pump will then speed up to reach the supply temperature Set Point target. In this mode the return sensor will read
“BP” on the LCD.
Set Point Cool Mode (32°F - 100°F, default = 70°F)
In Set Point Cool mode, the VT2218 operates in the reverse of Set Point Heat. It will start at the lowest speed. It then immediately
switches to Variable Speed operation, increasing speed to lower temperature or decreasing speed to raise temperature and
maintain the Set Point Cool target.
Boiler Protection (BP) Mode (100°F - 160°F, default = 140°F)
Note:
Boiler Protection Mode is designed to maintain a minimum boiler temperature to prevent flue gas condensation.
CAUTION: Do not attempt to remove LCD panel from circulator. Serious damage to circulator electronics may
result.
ATTENTION: N'essayez pas de retirer le panneau de LCD du circulateur. Des dommages s
é
rieux à l'électron-
ique du circulateur peuvent en r
é
sulter.
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