Install Instructions

ManualsBrandsTaco Manuals00 Series Cast Iron Circulator Pumps008 Variable Speed Delta-T Cast Iron Circulator Pump, 1/25 HP

The Variable Speed Delta T 00

Cartridge Circulator (00-VDT) is a microprocessor-based pump which automatically adjusts its perfor-

mance to deliver the optimal heat transfer based on the actual operation of the system. The 00-VDT regulates the temperature to provide

a fixed temperature difference (ΔT) of between 5 - 50°F between two field installed sensors.

Variable Speed Differential Temperature Control

Variable speed pumping to maintain a set differential temperature (delta T or ΔT) between two sensors allows for automatic adjustment of

the pump’s performance to match the load of the system or zone, eliminate velocity noise in zone valve systems and conserve energy.

Since delta T is directly related to flow rate, the pump’s speed continually adjusts to the required BTU per hour. In almost all applications

the design of the system was based on being able to maintain a certain delta T and figured by using the universal hydronics equation of

BTU/hr = GPM x 500 x ΔT. Given that, any time there is a change to the heat load (i.e. warmer day or greater heat loss from a structure)

then the GPM should change to match the required BTU/hr. This is achieved when the variable speed 00-VDT Circulators automatically

and continually adjust their GPM output (by varying speed) to match the required BTU/hr output of the system, no matter the changes

in heat load, while always maintaining the designed delta T between a supply and return sensor.

Applications

Instruction Sheet

Variable Speed Delta T (00-VDT)

102-359

SUPERSEDES: May 1, 2010 EFFECTIVE: October 1, 2010

Plant ID# 001-3927

DIP 5 = Off

DIP 4 = Off

DIP 3 = On

DIP 2 = Off or On

DIP 1 = On

Delta T Across a Series Loop System Using Zone Valves

"00"-VDT

Supply

Sensor

Return

Sensor

The 00-VDT Variable Speed Circulator adjusts its speed to maintain the differential temperature (based on the RANGE dial setting) between the

supply sensor and the return sensor whenever a heat demand is present. This will increase overall comfort and sharply reduce boiler short-cycling.

The 00-VDT will also control velocity noise issues in the system, eliminatin

the need for a pressure differential bypass valve.

DIP 5 = Off

DIP 4 = Off

DIP 3 = On

DIP 2 = Off or On

DIP 1 = On

Delta T Across Multi-Zone Radiant Manifolds with Loop Actuators

iSeries-R

“00”-VDT

Supply

Sensor

Return

Sensor

M M M M

Outdoor

Sensor

Boiler

Sensor

The 00-VDT Variable Speed Circulator adjusts its speed to maintain the differential temperature (based on the RANGE dial setting) between the

supply sensor and the return sensor whenever a heat demand is present. The 00-VDT will also eliminate velocity noise by slowing the actual flow

rate through the zone to the minimum required to deliver proper heat. If other zones on the manifold open, the 00-VDT will increase its speed to

deliver the required BTU’s, while at the same time maintaining the designed for delta T across the radiant system.

See www.taco-hvac.com for additional applications for the 00-VDT circulators.

A Taco resource – saving product

Summary of content (8 pages)

PAGE 1
Instruction Sheet 102-359 00® Variable Speed Delta T (00-VDT) SUPERSEDES: May 1, 2010 EFFECTIVE: October 1, 2010 Plant ID# 001-3927 The Variable Speed Delta T 00® Cartridge Circulator (00-VDT) is a microprocessor-based pump which automatically adjusts its performance to deliver the optimal heat transfer based on the actual operation of the system. The 00-VDT regulates the temperature to provide a fixed temperature difference (ΔT) of between 5 - 50°F between two field installed sensors.
PAGE 2
Pump Selection The circulator should be sized, using conventional sizing practices, based on the required head and flow for the system or zone on which the circulator is being installed. Sequence of Operation Power Up and Heat Request Whenever the 00-VDT is powered up, the green PWR LED turns on. The 00-VDT starts operating once a heat request signal is present at the Heat Request (Ht Req) terminals. The heat request terminals come factory jumpered so the pump will start as soon as it is powered up.
PAGE 3
Wiring and Sensor Installation WARNING: Wiring connections must be made in accordance with all applicable electrical codes. CAUTION: To prevent electrical shock, disconnect electric power to system at main fuse or circuit breaker box until installation is complete. When a service switch is installed, more than one disconnect switch may be required to deenergize this device for servicing.
PAGE 4
Troubleshooting As in any troubleshooting procedure, it is important to isolate a problem as much as possible before proceeding. The error messages greatly simplify troubleshooting of the 00-VDT. When the 00-VDT flashes an error message, identify the fault and follow standard testing procedures to confirm the problem. If you suspect a wiring fault, return to the wiring section on this brochure and carefully check all external wiring and wiring connections.
PAGE 5
Installation 1. Mounting position – Circulator must be mounted with the motor in a horizontal position. It may be mounted vertically with the motor up, provided that the system pressure is at least 20 psi (138 kPa). 2. Rotating body – Body has an arrow on the front that indicates direction of flow. To rotate body, remove the four body bolts, rotate body and replace bolts. Make sure that the junction box is NOT located underneath the circulator.
PAGE 6
Replacing Integral Flow Check (IFC) Assembly (if applicable) 1. Disconnect the electrical supply. 2. Reduce system pressure to 0 psi and allow system to return to room temperature. Isolate the circulator by closing the service valves or draining the system. 3. Loosen flange bolts and remove entire circulator from the system to access the flange mounted IFC. 4. Remove IFC, using needle nose pliers. 5. Install replacement IFC by pressing valve into casing until it is firmly seated. 6.
PAGE 7
Notes 7
PAGE 8
Notes LIMITED WARRANTY STATEMENT Taco, Inc. will repair or replace without charge (at the company’s option) any Taco 00 Series circulator or circulator part which is proven defective under normal use within three (3) years from the date of manufacture.