Taco Viridian Delta-T User manual

Viridian VT2218
Instruction Sheet
102-483
SUPERSEDES: April 7, 2014 EFFECTIVE: May 12, 2014
Plant ID No. 001-4141
Delta-T Variable Speed, ECM High-Efficiency Circulator
DESCRIPTION:
The Viri ian VT2218 circulator is a temperature sensing, self-a justing, variable
spee wet rotor circulator with an ECM, permanent magnet motor. Operating
mo es inclu e Delta-T, constant spee , set point heat, set point cool, an boiler
protection. Its high efficiency motor re uces power consumption by up to 85%
compare to equivalent AC permanent split capacitor circulators.
APPLICATION:
• Maximum operating pressure: 125 psi (862 kPa)
• 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
• Equippe with a cast iron casing an shoul be use for close
loop systems only.
• Taco circulator pumps are for in oor use only – employer uniquement a
l’interieur.
• Acceptable for use with water or maximum of 50% water/glycol solution.
FEATURES:
• 5 operating mo es:
- Delta-T; variable spee , maintains constant ∆T, provi es exact GPM flow require
- Constant Spee - 4 fixe spee options, maintains constant flow for zoning
- Set Point Heat - variable spee with boiler protection option, ecreases spee on temperature rise
- Set Point Cool - variable spee , increases spee on temperature rise
- Boiler Protection - protects boiler from low return temperature an flue gas con ensation
• Full LCD isplay showing:
- Mo e, spee or temperature setting, watts, supply temperature, return temperature, an error
co e iagnostics.
• Use with a Taco ZVC Zone Valve Control or SR Switching Relay for ON/OFF operation.
• Integral Flow Check (IFC) is inclu e in carton. Simply press into ischarge flange if require .
• Swivel-flange casing provi es 360° rotation mounting flexibility.
• BIO BarrierTM protects rotor an bearings from black iron oxi e.
• Whisper quiet operation (<40 B)
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 remplis-
sage. Un réservoir d'expansion d'une taille supérieure peut être nécessaire.

2
BOILER
FF
EXPANSION
TANK
ZONE 1ZONE 2
V1
PV4
FIGURE 1:
PREFERRED PIPING
FOR CIRCULATORS
ON BOILER SUPPLY
ZONE 1
V2
V3
P
ZONE 3
ZONE 2
V2
V3
P
ZONE 3
V2
V3
P
• AIR PURGING SEQUENCE
BY ZONE
LAST FIRST
BOILER
FF
EXPANSION
TANK
ZONE
1
ZONE
2
V1
PV4
ALTERNATE PIPING
FOR CIRCULATORS
ON BOILER RETURN
ZONE 1ZONE 2
V2V2
V3V3
PP
ZONE
3
ZONE 3
V2
V3
P• AIR PURGING
SEQUENCE
BY ZONE
LAST FIRST
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

BOILER
FF
EXPANSION
TANK
ZONE 1ZONE 2
V1
PV4
FIGURE 2:
PREFERRED PIPING
FOR ZONE VALVES
ON BOILER SUPPLY
ZONE 1
V2
V3
ZONE 3
ZONE 2
V2
V3
ZONE 3
V2
V3
• AIR PURGING SEQUENCE
BY ZONE
LAST FIRST
BOILER
FF
EXPANSION
TANK
ZONE
1
ZONE
2
V1
PV4
ALTERNATE PIPING
FOR ZONE VALVES
ON BOILER RETURN
ZONE 1ZONE 2
V2V2
V3V3
ZONE
3
ZONE 3
V2
V3
• AIR PURGING
SEQUENCE
BY ZONE
LAST FIRST
P
P
ZV3 ZV2 ZV1
M
ZV1 ZV2 ZV3
MM
M
M
M
SUPPLY
∆T SENSOR WIRING
RETURN
SUPPLY
∆T SENSOR WIRING
RETURN
3
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

4
ACCEPTABLE MOTOR MOUNTING POSITIONS CASING/FLANGE ROTATION
To rotate the casing, remove the 4 motor screws an spin
the casing to the esire flow irection. Reattach the 4
screws (5⁄32"allens wrench require ). Be sure bo y gasket
is seate evenly to prevent leakage. Tighten motor
screws to 34-42 in-lbs torque.
HOT
NEUTRAL
GROUND
BLACK
WHITE
GREEN
SCREW
TERMINAL BOX
WARNING: Use supply wires suitable for 90°C
AVERTISSEMENT: Employer des fils d’alimentation adeqauts pour 90°C.
1. Location:
The circulator can be installe on the supply or return si e of the boiler but for best system performance, it shoul always pump
away from the expansion tank. See piping iagrams in Figures No.1 an No. 2.
2. Mounting position:
Circulator must be mounte with the motor in the horizontal position. See iagrams below for acceptable motor mounting orien-
tations. Swivel flanges allow 360° rotation of pump.
3. Fill the system with tap water or a maximum of 50% propylene-glycol and water solution:
The system must be fille before operating the circulator. The bearings are water lubricate an shoul not be allowe to operate
ry. Filling the system will result in imme iate lubrication of the bearings. It is always goo practice to flush a new system of for-
eign matter before starting the circulator.
4. Wiring the circulator:
Position electrical knockout at 6 o’clock position for best programming an LCD viewing orientation. Casing
may be rotate to change flow irection.
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.
WARNING: Risk of electric shock. To reduce the risk of electric shock be certain that it is connected only to a prop-
erly 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 rac-
cordée uniquement à un réceptacle de type mise à la terre proprement mis à la terre. Respectez tous les codes de
plomberie et électriques locaux.
• Disconnect AC power supply. Remove terminal box cover. Threa a wiring connector into npt knockout. Note: To install an angle connector removal of sensor cap
may be require for clearance. Connect hot wire to black lea an neutral wire to white lea . Connect groun wire to green groun screw. Replace terminal box
cover.
• Remove sensor cap. Sli e sensor wires through grommet in sensor cap.
• Attach sensor wires provi e as shown:
- Delta-T mo e uses supply an return (S + R).
- Set Point mo e uses supply (S) for system sensor an return (R) for boiler protection return sensor.
• Attach sensors to supply an return piping using the zip-ties provi e . See iagram above.
- In Delta-T mo e, place sensors on system supply an return.
- In Set Point Heat mo e, place supply sensor on system loop supply. If boiler protection option is use , place return sensor on boiler return.
• Insulate pipe aroun sensors as shown.
Sensor Cap with Grommet
Return Sensor (R)
Supply Sensor (S)
Common

5
5. Start the circulator:
Note: When power is applie to the circulator it will go through a 10 secon iagnostic elay before starting. The LCD will illu-
minate for 15 secon s with factory pre-set Delta-T mo e an 20°F ∆T settings. Press any button to illuminate the LCD for 1
more minute.
It is recommen e to run the circulator at full spee 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 spee uring the fast fill, start-up an purge process, press an hol the UP button for 3 secon s. “Full Spee
Overri e” will appear on the LCD isplay. To return to the programme , normal operating mo e, press the SET button.
6. Programming your VT2218 circulator:
Note: The VT2218 is factory-programme for Delta-T operating mo e with a 20°F temperature ifferential setting. If this is your
esire operating mo e an Delta-T setting, no programming changes are require .
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
iSeries-R
B
C
A
B
C
A
M
MM MM MM 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 spee to maintain
a constant temperature
ifferential (∆T)
• Set Point Heat
- Varies spee to maintain
a fixe temperature
• Boiler Protection Option
- Decreases spee to protect
boiler from low return water
temperature an flue gas
con ensation
• Boiler Protection
- Increases spee to protect boiler from low return
water temperature an flue gas con ensation
• Heating or Chille
Water Cooling
• Set Point Heat
- Decreases spee
on temperature rise
• Set Point Cool
- Increases spee on
temperature rise

To change operating mode and settings:
a. Press an hol the SET button for 3 secon s. The operating mo e on the LCD will begin
to flash.
b. Use the UP or DOWN buttons to scroll through operating mo e options. When the esire
mo e flashes on the LCD, press the SET button. The LCD will begin to flash either tem-
perature or spee setting options, whichever applies.
c. Use the UP button to increase temperature or spee settings. Use the DOWN button to
ecrease temperature or spee settings. When the esire setting flashes, press the SET
button.
. Your programming is complete an the operating mo e an setting will appear on the LCD
screen.
US or Metric Units
The VT2218 can be programme to isplay in either US or Metric units. The efault is US units. To change units to Metric, use
the programming steps above to scroll to SETUP MODE. Press SET an the efault 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 esire units are flashing, press the
SET button.
7. Reading the LCD screen:
The LCD screen will isplay important iagnostic information:
Operating Mode - Delta-T, Constant Spee , Set Point Heat, Set Point Cool, or Boiler Protection.
Setting - Delta-T, Fixe spee , Set Point target temperature, or Boiler Protection minimum temperature.
Watts - Power usage of the circulator.
S- Supply sensor temperature.
R (or BP) - Return sensor temperature (or Boiler Return temperature in Set Point mo e).
8. Sequence of Operation - How the VT2218 Works:
Delta-T Mode (5°F - 50°F default = 20°F)
In Delta-T mo e, the VT2218 will start at the lowest spee . If it rea s a temperature ifferential (∆T) LESS than its target, it will
continue to gra ually increase spee through a 3 minute “Start Cycle” to its highest spee , until target ∆T is reache . “Start
Cycle” will be in icate on the LCD screen in place of “Watts”. If ∆T is GREATER than target, the pump will imme iately go into
Variable Spee operation an vary spee to maintain the target ∆T.
Constant Speed Mode (Speeds 1 2 3 4 default = Speed 4)
In Constant Spee mo e, the VT2218 will always start an run at the pre-set Spee Level (1 through 4). Only watts will be is-
playe . Temperature sensors are not active in this mo e.
Set Point Heat Mode (with Boiler Protection option) (50°F - 220°F default = 105°F BP default = 140°F)
In Set Point Heat mo e, the VT2218 will start at the lowest spee . It then imme iately switches to Variable Spee operation,
increasing spee to raise temperature or ecreasing spee to lower temperature an maintain the Set Point Heat target.
If Boiler Protection (BP) option is use with Set Point Heat, the return sensor (R) will over-ri e the supply sensor (S) an slow
the pump own if boiler return water temperature falls below BP target (for example 140°F). Once the return sensor rea s BP
target, the pump will then spee up to reach the supply temperature Set Point target. In this mo e the return sensor will rea
“BP” on the LCD.
Set Point Cool Mode (32°F - 100°F default = 70°F)
In Set Point Cool mo e, the VT2218 operates in the reverse of Set Point Heat. It will start at the lowest spee . It then imme i-
ately switches to Variable Spee operation, increasing spee to lower temperature or ecreasing spee to raise temperature
an maintain the Set Point Cool target.
Boiler Protection Mode (100°F - 160°F default = 140°F)
Note: Boiler Protection Mo e is esigne to maintain a minimum boiler temperature to prevent flue gas con ensation.
In e icate Boiler Protection (BP) mo e, the VT2218 will always be powere on a normal heating cycle. The pump will only
increase spee if the boiler return sensor (R) falls below BP target (for example 140°F). It will start at the lowest spee an begin
to increase spee until the return sensor reaches BP target. It will maintain target temperature until the heating cycle en s or
if boiler return temperature reaches target +5°F after 5 minutes run time. The pump will then stop. If a new heating cycle starts
an the return sensor again falls below BP target, the cycle repeats.
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'électron-
ique du circulateur peuvent en résulter.
6

7
9. Troubleshooting the error codes:
Liste below are potential iagnostic error co es which will appear on the LCD isplay in case of a malfunction.
Testing the Sensors
A goo quality test meter capable of measuring up to 5,000 kΩ(1 kΩ= 1000Ω) is require to measure the sensor resistance. In
a ition to this, the actual temperature must be measure with a goo quality igital thermometer.
First measure the temperature using the thermometer an then measure the resistance of the sensor at the Bumble Bee. The wires
from the sensor must not be connecte to the circulator while this test is performe . The wiring terminals are easily remove by
pulling them from the circulator. Using the chart below, estimate the temperature measure by the sensor. The sensor an ther-
mometer rea ings shoul be close. If the test meter rea s a very high resistance, there may be a broken wire, a poor wiring con-
nection or a efective sensor. If the resistance is very low, the wiring may be shorte , there may be moisture in the sensor or the
sensor may be efective. To test for a efective sensor, measure the resistance irectly at the sensor location.
ERROR CODE* DESCRIPTION CORRECTIVE ACTION
SENSOR 1 MISSING Supply sensor isconnecte . Reconnect sensor.
SENSOR 2 MISSING Return sensor isconnecte . Reconnect sensor.
SENSOR 1 SHORTED Ba sensor. Replace sensor.
SENSOR 2 SHORTED Ba sensor. Replace sensor.
AC INPUT UNDER VOLTAGE Low voltage problem. Check power supply.
AC INPUT OVER VOLTAGE High voltage problem. Check power supply.
LOCKED ROTOR Probable locke rotor or motor failure. Replace pump.
MOTOR OVER CURRENT Possible locke rotor. Replace pump.
OVER TEMPERATURE PC Boar overheating.
Pump will re uce current an spee until PCB tem-
perature is acceptable. If spee falls below 1650
RPM, pump will stop on safety. Cycle AC power
OFF/ON to restart.
* Flashing Displayed on LCD
SPEED TACO GRUNDFOS WILO B & G/XYLEM ARMSTRONG
1 003 - - - -
2 006 - - - Compass-1
3
007
008
0015-1
0015-2
UP-15-42
UPS-15-58-1
UPS-15-58-2
Star S-21-1
Star S-21-2
NRF-25-1
NRF-25-2
Astro 230-1
Astro 230-2
Compass-2
4 0015-3 UPS-15-58-3 Star S-21-3 NRF-25-3
Eco-Vario
Astro 230-3
Compass-3
Pump Cross Reference (Constant Speed Mode):
Temperature Resistance Temperature Resistance Temperature Resistance Temperature Resistance
°F °C Ω°F °C Ω°F °C Ω°F °C Ω
-30 -34 234,196 30 -1 34,558 90 32 7,334 150 66 2,045
-20 -29 165,180 40 4 26,099 100 38 5,828 160 71 1,689
-10 -23 118,018 50 10 19,900 110 43 4,665 170 77 1,403
0 -18 85,362 60 16 15,311 120 49 3,760 180 82 1,172
10 -12 62,465 70 21 11,883 130 54 3,050 190 88 983
20 -7 46,218 80 27 9,299 140 60 2,490 200 93 829
MODE TACO GRUNDFOS WILO B & G/XYLEM ARMSTRONG
Delta-T 008-VDT Alpha 15-55 Stratos Eco Eco-Auto Compass
Pump Cross Reference (Delta-T Mode):

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
efective un er normal use within three (3) years
from the ate of manufacture.
In or er to obtain service un er this warranty, it
is the responsibility of the purchaser to promptly
notify the local Taco stocking istributor or Taco
in writing an promptly eliver the subject pro uct
or part, elivery prepai , to the stocking istrib-
utor. For assistance on warranty returns, the
purchaser may either contact the local Taco
stocking istributor or Taco. If the subject pro -
uct or part contains no efect as covere in this
warranty, the purchaser will be bille for parts
an labor charges in effect at time of factory
examination an repair.
Any Taco pro uct or part not installe or operate
in conformity with Taco instructions or which
has been subject to misuse, misapplication, the
a ition of petroleum-base flui s or certain
chemical a itives to the systems, or other
abuse, will not be covere by this warranty.
If in oubt as to whether a particular substance
is suitable for use with a Taco pro uct 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 provi e replacement
pro ucts an parts which are substantially similar
in esign an functionally equivalent to the
efective pro uct or part. Taco reserves the right
to make changes in etails of esign, construc-
tion, or arrangement of materials of its pro ucts
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 DURA-
TION 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 SPE-
CIAL INCIDENTAL INDIRECT OR CONSE-
QUENTIAL 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, an the purchaser may have other rights
which vary from state to state. Some states o
not allow limitations on how long an implie
warranty lasts or on the exclusion of inci ental
or consequential amages, so these limitations
or exclusions may not apply to you.
Do your best work.®
TACO INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: [phone] FAX: [phone].
TACO (Canada) Ltd., 8450 Lawson Roa , Unit #3, Milton, Ontario L9T 0J8. Telephone: [phone]. FAX: [phone].
Visit our web site at: http://www.taco-hvac.com
Printe in USA
Copyright 2013
TACO, Inc.
8
FLOW - GPM
0 2 4 6 810121416182022
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
FLOW - M3/H
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
VT2218 PERFORMANCE CURVES
TOTAL HEAD - FEET
TOTAL HEAD - METERS
Shaded area is variable
speed operating range.
Min. Speed 1 (9W)
Speed 2 (24W)
Speed 3 (40W)
Max. Speed 4 (58W)
1
2
3
4
1
2
3
4