48297 2 Taco Vt2218 Circulator Instructions 102 503 User Manual

User Manual: Pump 48297 2 Taco Vt2218 Circulator Instructions

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00e series VT2218
Instruction Sheet

102-510

™

Use for pumps with
date code TBD
or after.

Delta-T Variable Speed, ECM High-Efficiency Circulator

SUPERSEDES: NEW

Plant ID No. 001-4267

EFFECTIVE: June 14, 2016

DESCRIPTION:
The 00e™series VT2218 circulator is a temperature sensing, self-adjusting, variable speed
wet rotor circulator with an ECM, permanent magnet motor. Operating modes include
Delta-T, constant speed, set point heat, set point cool, and boiler protection. Its high
efficiency motor reduces power consumption by up to 85% compared to equivalent AC
permanent split capacitor circulators.
APPLICATION:
• Maximum operating pressure: 125 psi (862 kPa)
• Minimum water temperature: 36ºF (2ºC)
• Maximum water temperature: 230°F (110ºC)
• Electrical specifications:
Voltage: 110-120V, 50/60 Hz, single phase
Maximum operating power: 58W
Maximum amp rating: 0.67

• Equipped with a cast iron casing and should be used for closed loop systems only.
• Taco circulator pumps are for indoor use only – employer uniquement a l’interieur.
• Acceptable for use with water or maximum of 50% water/glycol solution.

For more information, visit
www.TacoComfort.com

FEATURES:
• 5 operating modes:
- Delta-T - variable speed, maintains constant ∆T, provides exact GPM flow required
- Constant Speed - 4 fixed speeds, maintains constant flow for zoning
- Set Point Heat - variable speed with boiler protection option, decreases speed on temperature rise
- Set Point Cool - variable speed, increases speed on temperature rise
- Boiler Protection - protects boiler from low return temperature and flue gas condensation

• Illuminated LCD displays:
- Operating mode, speed or temperature setting, watts, gpm, supply temperature, return temperature, and
error code diagnostics.
• Use with a Taco ZVC Zone Valve Control or SR Switching Relay for ON/OFF operation.
• Integral Flow Check (IFC) is included in carton. Simply press into discharge flange if required.
• Nut capture feature on flanges for easier fit up.
• Whisper quiet operation.
• BIO Barrier ® protects the pump from system contaminants.

• SureStart automatic unblocking mode.
• Optional, 2-way flange model available to reduce SKU’s and provide universal fit-up to any flange position.
INSTALLATION:

WARNING: Do not use in swimming pool or spa areas. Pump has not been investigated for these applications.
AVERTISSEMENT: Ne pas utiliser dans une piscine ou un spa. La pompe n'a pas été étudiée pour ces applications.

CAUTION: The addition of petroleum based fluids or certain chemical additives to systems using TACO equipment voids the
warranty. Consult factory for fluid compatibility.
ATTENTION: L'ajout de liquides à base de pétrole ou de certains additifs chimiques à des systèmes utilisant un équipement TACO
annule la garantie. Consultez le fabricant pour connaître la compatibilité de liquides.

CAUTION: Installations at elevations over 5000 feet must have higher fill pressure of 20 psi minimum to prevent pump cavitation
and flashing. Premature failure may result. Adjust expansion tank pressure to equal fill pressure. A larger size expansion tank may
be required.
ATTENTION: Des installations à des altitudes de plus de 1600 mètres doivent présenter une pression de remplissage plus élevée
de 20 psi au minimum afin d'éviter toute cavitation ou flashing de la pompe. Une défaillance prématurée peut en résulter. Réglez
la pression du réservoir d'expansion de façon qu'elle soit égale à la pression de remplissage. Un réservoir d'expansion d'une taille
supérieure peut être nécessaire.

KEY:
VI, V2, V3 = SHUT-OFF ISOLATION VALVE
P = TACO CIRCULATOR WITH IFC
FF = FAST FILL BOILER FEED VALVE
PV4 = PURGE VALVE
RECOMMENDED PURGING STEPS:
1. CLOSE V1, PV4, V2
2. OPEN V3
3. OPEN FF VALVE
4. OPEN V2, PV4, TO PURGE LAST ZONE
FIRST (ZONE 3)
5. CLOSE FF VALVE
6. CLOSE V2, PV4
7. REPEAT STEPS 1 TO 6 FOR EACH
ADDITIONAL ZONE, PURGE ZONE 1 LAST
8. OPEN V1 WHEN ALL ZONES ARE
PURGED
9. ADJUST SYSTEM TO DESIRED OPERATING
FILL PRESSURE IF REQUIRED

KEY:
VI, V2, V3 = SHUT-OFF ISOLATION VALVE
P = TACO CIRCULATOR WITHOUT IFC INSTALLED
FF = FAST FILL BOILER FEED VALVE
PV4 = PURGE VALVE
ZV = ZONE VALVE
RECOMMENDED PURGING STEPS:
1. CLOSE V1, PV4, V2
2. OPEN V3 AND ZV3
3. OPEN FF VALVE
4. OPEN V2, PV4, TO PURGE LAST ZONE FIRST (ZONE 3)
5. CLOSE FF VALVE
6. CLOSE V2, PV4
7. REPEAT STEPS 1 TO 6 FOR EACH ADDITIONAL ZONE,
PURGE ZONE 1 LAST
8. OPEN V1 WHEN ALL ZONES ARE PURGED
9. ADJUST SYSTEM TO DESIRED OPERATING FILL PRESSURE IF REQUIRED
10. MOVE ALL ZV TO CLOSED/AUTOMATIC POSITION

Typical Variable Speed Applications:

• Delta-T
- Varies speed to maintain
a constant temperature
differential (∆T)

Across a Series
Loop System Using
Zone Valves

Supply
Sensor

Outdoor
Sensor
M

C
C

B
B
A
A

Boiler
Sensor

Return
Sensor

Radiant Injection Set Point with Boiler Protection Option
Mixing
Supply
Sensor

Boiler Protection By-Pass

Fan Coil Fixed Temperature
Duct
Supply
Sensor

Boiler
Return Sensor

• Boiler Protection
- Increases speed to protect boiler from low return
water temperature and flue gas condensation

iSeries-R

Supply
Sensor

Boiler Return
Sensor

Return
Sensor

Across Multi-Zone
Radiant Manifolds
with Loop Actuators

• 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
• Heating or Chilled
Water Cooling

• Set Point Heat
- Decreases speed
on temperature rise

• Set Point Cool
- Increases speed on
temperature rise

Location:
The circulator can be installed on the supply or return side of the boiler but for best system performance, it should always pump
away from the expansion tank. See piping diagrams in Figures No.1 and No. 2.

Integral Flow Check (IFC®) option - An IFC® is included in the carton. If required, press IFC into machined discharge port with plunger
and o-ring facing in, until it snaps into place. Before installing, press IFC plunger to be sure it moves freely. See diagram below.
2.

Mounting position:
Circulator must be mounted with the motor in the horizontal position. See diagrams below for acceptable motor mounting orientations.

CAUTION: Do not use flat rubber gaskets. Only use O-ring gaskets provided or leaks may result. Warranty will be void.

ACCEPTABLE MOTOR MOUNTING POSITIONS

CASING ROTATION

Position electrical knockout at 6 o’clock position for best programming and LCD viewing orientation. Casing
may be rotated to change flow direction.

To rotate the casing, remove the 4 motor screws and spin the
casing to the desired flow direction. Reattach the 4 screws
(5⁄32" allens wrench required). Be sure body gasket is seated
evenly to prevent leakage. Tighten motor screws to 34-42 inlbs torque.

CAUTION: To reduce the possibility of noise transmission, be sure to add vibration dampeners to piping when
mounting circulator to wall or floor joists.
ATTENTION: Pour réduire la possibilité de transmission de bruit, veillez à ajouter des amortisseurs de vibration à la
tuyauterie lors du montage du circulateur sur des chevêtres de mur ou de plancher.
3.

Fill the system with tap water or a maximum of 50% propylene-glycol and water solution:
The system must be filled before operating the circulator. The bearings are water lubricated and should not be allowed to operate
dry. Filling the system will result in immediate lubrication of the bearings. It is always good practice to flush a new system of foreign
matter before starting the circulator.

WARNING: Risk of electric shock. To reduce the risk of electric shock, be certain that it is connected only to a properly grounded, grounding-type receptacle. Follow all local electrical and plumbing codes.
AVERTISSEMENT: Risque de choc électrique. Pour réduire le risque de choc électrique, veillez à ce qu'elle soit raccordée uniquement à un réceptacle de type mise à la terre proprement mis à la terre. Respectez tous les codes de
plomberie et électriques locaux.
WARNING: Use supply wires suitable for 90°C,
AVERTISSEMENT: Employer des fils d’alimentation adeqauts pour 90°C.
4.

Wiring the circulator:

• Disconnect AC power supply. Remove terminal box cover. Thread a wiring connector into npt knockout. Note: To install an angle connector
removal of sensor cap may be required for clearance. Connect hot wire to black lead and neutral wire to white lead. Connect ground wire to Green
Ground screw. Replace terminal box cover.
Sensor Cap with Grommet
Sensor Cap with Grommet

HOT

BLACK

NEUTRAL

WHITE
GREEN
SCREW

GROUND

TERMINAL BOX

Return Sensor (R)

Supply Sensor (S)

• Remove sensor cap. Slide sensor wires through grommet in sensor cap. See diagram above.
Common
• Attach sensor wires provided as shown:
- Delta-T mode uses supply and return (S + R).
- Set Point mode uses supply (S) for system sensor and return (R) for boiler protection return sensor.
• Attach sensors to supply and return piping using the zip-ties provided. See diagram above.
- In Delta-T mode, place sensors on system supply and return.
- In Set Point Heat mode, place supply sensor on system loop supply. If boiler protection option is used, place return sensor on boiler return.
• Insulate pipe around sensors as shown.

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 illuminate for the first 5 minutes of a run cycle. Press any of the programming buttons to re-illuminate the LCD.
When air purging the system, it is recommended to run the circulator at full speed long enough to remove all remaining air from the bearing chamber. This is especially important when installing the circulator in the off-season.

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.
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 until “Full
Speed Override” appears on the LCD display. To return to the programmed, normal operating mode, press the SET button.

“SureStart” Feature: In rare cases where a locked rotor may occur, the SureStart feature will activate automatically and rapidly vibrate
to unblock the rotor and continue normal operation.

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.
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.

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).

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 display 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 displayed. 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 sérieux à l'électronique du circulateur peuvent en résulter.
6

Troubleshooting the error codes:

SureStart Feature: The VT2218 is programmed with an automatic unblocking feature. In the case of a locked rotor condition, it will
attempt to unblock the rotor with a series of rapid oscillating actions. It will repeat this process up to 100 times. If still locked after
100 attempts, “LOCKED ROTOR” will apppear on the LCD. See error code listing below.
Listed below are potential diagnostic error codes which will appear on the LCD display in case of a malfunction.
ERROR CODE*

DESCRIPTION

CORRECTIVE ACTION

SENSOR 1 MISSING

Supply sensor disconnected.

Reconnect sensor.

SENSOR 1 SHORTED

Bad sensor.

Replace sensor.

SENSOR 2 MISSING

Return sensor disconnected.

SENSOR 2 SHORTED

Reconnect sensor.

Bad sensor.

AC INPUT UNDER VOLTAGE

Replace sensor.

Low voltage problem.

AC INPUT OVER VOLTAGE

Check power supply.

High voltage problem.

LOCKED ROTOR

Check power supply.

Probable locked rotor or motor failure.

MOTOR OVER CURRENT

Replace pump.

Possible locked rotor or motor over current.

OVER TEMPERATURE

Replace pump.

Pump will reduce current and speed until PCB
temperature is acceptable. If speed falls below
1650 RPM, pump will stop on safety. Cycle AC
power OFF/ON to restart.

PC Board overheating.

* Flashing Displayed on LCD

Testing the Sensors
A good quality test meter capable of measuring up to 5,000 kΩ (1 kΩ = 1000Ω) is required to measure the sensor resistance. In
addition to this, the actual temperature must be measured with a good quality digital thermometer.

First measure the temperature using the thermometer and then measure the resistance of the sensor at the VT2218. The wires from
the sensor must not be connected to the circulator while this test is performed. The wiring terminals are easily removed by pulling
them from the circulator. Using the chart below, estimate the temperature measured by the sensor. The sensor and thermometer
readings should be close. If the test meter reads a very high resistance, there may be a broken wire, a poor wiring connection or a
defective sensor. If the resistance is very low, the wiring may be shorted, there may be moisture in the sensor or the sensor may be
defective. To test for a defective sensor, measure the resistance directly at the sensor location.

Temperature
°F

-30

-20
-10
0

Resistance

Temperature

Resistance

-34

234,196
Ω

°F

34,558

85,362

-1

-18

165,180

°C

15,311

°C

-29
-23

118,018

-12

62,465

-7

46,218

°F

26,099

100

19,900

Temperature

11,883

9,299

Resistance

Temperature

7,334

150

°C

2,045

120

3,760

180

1,172

110

130

140

5,828
4,665

°F

160

Resistance

°C

170

3,050

190

2,490

200

1,689

1,403

983

829

Pump Cross Reference (Constant Speed Mode):
SPEED

TACO

GRUNDFOS

WILO

B & G/XYLEM

ARMSTRONG

003

Alpha-15-55 (1)

007
008
0015-1
0015-2

UP-15-42
UPS-15-58 (1)
UPS-15-58 (2)

Star S-2 (1)
Star S-21 (2)

006

0015-3

Alpha-15-55 (2)

Compass (1)

NRF-25 (1)
NRF-25 (2)

Astro 230 (1)
Astro 230 (2)
Compass (2)

ARMSTRONG

UPS-15-58 (3)
Alpha-15-55 (3)

Star S-21 (3)

NRF-25 (3)
Eco-Vario

GRUNDFOS

WILO

B & G/XYLEM

Astro 230 (3)
Compass (3)

Pump Cross Reference (Delta-T Mode):
MODE

Delta-T

TACO

008-VDT

Alpha 15-55

Stratos Eco 16FX

Eco-Auto 19-14

Compass 2020

VT2218 PERFORMANCE CURVES

SHADED AREA IS
VARIABLE SPEED
OPERATING RANGE

LIMITED WARRANTY STATEMENT

Taco, Inc. will repair or replace without charge (at
the company’s option) any Taco High Efficiency
circulator or circulator part which is proven defective under normal use within three (3) years from
the date of manufacture.

In order to obtain service under this warranty, it
is the responsibility of the purchaser to promptly
notify the local Taco stocking distributor or Taco
in writing and promptly deliver the subject product
or part, delivery prepaid, to the stocking distributor. For assistance on warranty returns, the purchaser may either contact the local Taco stocking distributor or Taco. If the subject product or
part contains no defect as covered in this warranty, the purchaser will be billed for parts and
labor charges in effect at time of factory examination and repair.

Any Taco product or part not installed or operated
in conformity with Taco instructions or which has
been subject to misuse, misapplication, the addition of petroleum-based fluids or certain chemical additives to the systems, or other abuse, will
not be covered by this warranty.

If in doubt as to whether a particular substance
is suitable for use with a Taco product or part, or
for any application restrictions, consult the
applicable Taco instruction sheets or contact
Taco at (401-942-8000).

Taco reserves the right to provide replacement
products and parts which are substantially similar
in design and functionally equivalent to the
defective product or part. Taco reserves the right
to make changes in details of design, construction, or arrangement of materials of its products
without notification.

TACO OFFERS THIS WARRANTY IN LIEU OF
ALL OTHER EXPRESS WARRANTIES. ANY
WARRANTY IMPLIED BY LAW INCLUDING
WARRANTIES OF MERCHANTABILITY OR
FITNESS IS IN EFFECT ONLY FOR THE DURATION OF THE EXPRESS WARRANTY SET
FORTH IN THE FIRST PARAGRAPH ABOVE.
THE ABOVE WARRANTIES ARE IN LIEU OF

ALL OTHER WARRANTIES, EXPRESS OR
STATUTORY, OR ANY OTHER WARRANTY
OBLIGATION ON THE PART OF TACO.

TACO WILL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES RESULTING FROM THE
USE OF ITS PRODUCTS OR ANY INCIDENTAL
COSTS OF REMOVING OR REPLACING
DEFECTIVE PRODUCTS.

This warranty gives the purchaser specific rights,
and the purchaser may have other rights which
vary from state to state. Some states do not
allow limitations on how long an implied warranty
lasts or on the exclusion of incidental or consequential damages, so these limitations or exclusions may not apply to you.

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48297 2 Taco Vt2218 Circulator Instructions 102 503 User Manual

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