Install Instructions

ManualsBrandsTaco Manuals00 Series Cast Iron Circulator Pumps008 Variable Speed Setpoint Cast Iron Circulator with Integral Flow Check, Rotated Flange, 1/25 HP

The Variable Speed - Outdoor Reset ”00” Cartridge Circulator (00-VR) is a microprocessor-based pump designed to regulate the supply

water temperature to a heating system through variable speed injection mixing. The 00-VR modulates its speed to provide outdoor reset

to the heating system. A boiler sensor installed on the return line to the boiler is used to protect the boiler against flue gas condensa-

tion.

Outdoor Reset

In order to properly control a hot water heating system, the heat supplied to the build-

ing must equal the heat lost by the building.

• The heat supplied to the building is directly proportional to the temperature of the

water and the surface area of the heating element. The higher the temperature of the

water flowing through the heating terminal, the higher the heat output.

• The heat lost from a building is dependent on the outdoor temperature. As the out-

door temperature drops, the building heat loss increases.

These two facts lead to the concept of outdoor reset which increases the supply

water temperature as the outdoor temperature drops. Using this approach, the heat

lost from the building is matched by the heat provided by the terminal units, therefore

providing more comfort and energy savings.

Reset Ratio

The Reset Ratio sets the relationship between outdoor temperature and supply

water temperature. It determines the amount the supply water temperature is raised

for every 1 degree outdoor temperature drop. For example, if a Reset Ratio of 1.2

is selected, the supply water temperature is increased by 1.2 degrees of every 1

degree of outdoor temperature drop.

Variable Speed Injection Mixing

Variable Speed Injection Mixing uses a pump as a mixing device instead of a 2-way, 3-way or 4-way valve. The 00-VR operates a pump

in order to inject hot water from the boiler loop into the cooler system loop. The speed of the pump is modulated in order to inject dif-

ferent rates of hot water into the cooler system return water. This allows for virtually any water temperature to be supplied to the heat-

ing system. Most boilers cannot operate at low temperatures, therefore the 00-VR injection pump can be modulated back in order to

prevent the boiler from operating at cold temperatures.

102-141

Instruction Sheet

Variable Speed - Outdoor Reset (00-VR)

“00” Cartridge Circulator

SUPERSEDES: May 1, 2010

EFFECTIVE: October 1, 2010

Plant ID# 001-3809

Supply

Sensor

Boiler

Sensor

Outdor

Sensor

Variable S

eed In

ection Mixin

Supply

Sensor

Boiler

Sensor

Outdoor

Sensor

Variable Speed Injection with Low Temperature Zones

A Taco resource – saving product

Summary of content (8 pages)

PAGE 1
Instruction Sheet 102-141 Variable Speed - Outdoor Reset (00-VR) “00” Cartridge Circulator ® EFFECTIVE: October 1, 2010 SUPERSEDES: May 1, 2010 Plant ID# 001-3809 The Variable Speed - Outdoor Reset ”00” Cartridge Circulator (00-VR) is a microprocessor-based pump designed to regulate the supply water temperature to a heating system through variable speed injection mixing. The 00-VR modulates its speed to provide outdoor reset to the heating system.
PAGE 2
In order to properly accomplish this mixing method, the following piping details should be considered. When the injection pump is turned off, there must be no heat transfer from the boiler loop to the system loop. In order to avoid this unwanted heat transfer, primary/secondary piping techniques are used as shown in figure 1. This piping arrangement requires that the injection piping be at least one pipe diameter smaller than the piping of the boiler and system loops.
PAGE 3
Sequence of Operation Power Up and Heat Request Whenever the control is powered up, the green PWR LED turns on. The 00-VR starts operating once a heat request signal is present at the Heat Request (Ht Req) terminals. A heat request signal may be provided by external end switches from zone valves or ZVC/SR Zone Controls, applying a dry contact closure or a powered 24 V (ac) signal across the Ht Req terminals.
PAGE 4
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 5
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-VR. When the 00-VR 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 6
APPLICATION 1. Maximum operating pressure: 125 psi (862 kPa) on all “00” Series Circulators, 200 psi (1379 kPa) on all Load Match® Circulators. 2. Maximum water temperature not to exceed nameplate rating. 3. Cast iron circulators are to be used for closed loop systems. Bronze circulators are to be used for open loop, fresh water, or potable water systems. 4. Taco Cartridge circulator pumps are for indoor use only – employer uniquement a l´interieur. INSTALLATION 1.
PAGE 7
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. Remove the body bolts and swing motor assembly away from the body. 4. Remove IFC, using needle nose pliers. 5. Install replacement IFC by pressing valve into casing until it is firmly seated. 6.
PAGE 8
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. 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.