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Armstrong AG Series - User Manual

Armstrong AG Series
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AG SERIES
INSTALLATION AND OPERATING INSTRUCTIONS
FILE NO: 10. 822IN
DATE: Nov. 02, 2010
SUPERSEDES: New
DATE: Apr. 12, 2010
This installation guide gives basic instructions which are to be
observed during installation, operation and maintenance of the
circulator. It is therefore imperative that this manual be read by the
responsible person / operator prior to the installation and should
always be kept available at the site. It is not only the general safety
instructions under this main heading “Safety” that are to be observed
but also the specific information provided under the other main
headings.
Serial No.: See nameplate
The “AG” CIRCULATORS are available in:
Dark blue model for heating and chilled water (20-50% Glycol
solution).
Yellow model for secondary hot water application.
CIRCULATOR MEDIUM
Clean, thin non-aggressive and non-explosive fluids without any solids
or fibres. Antifreeze without any mineral oil (special model upon
request)
Please note: If any liquid other than water is being circulated, we
recommend that you contact our their representatives as the circulator
characteristics may change.
SAFETY
- The surface temperature might be hot.
- When venting the circulator (fig. 5),
it could result in a slight escape of hot water or steam!
- Circulator should be wired in line with the existing
regulations.
- The electrical supply to the circulator is to be
switched off before adjusting the speed plug.
PERSONEL QUALIFICATION AND TRAINING
Personnel responsible for operation, maintenance, inspection and
installation of the circulator must be in possession of the necessary
qualifications for this kind of work.
Furthermore the owner should assure that the contents of the operation
manual is understood by his personnel.
Airborne Sound pressure level (distance 1 m)
max 55 dB (A)
TRANSPORT, HANDLING AND STORAGE
INSTRUCTIONS
a. Transport
i . AG circulators are despatched fully assembled.AG
circulators are packed for transport by road, sea and air carriers.
b. Handling
i. Crushing Hazard.
ii. When lifting an AG circulator above a weight of 25 kg,
use lifting equipment having a safe working load rating suitable
for the load specified. Use suitable slings for lifting any
circulator.
c. Storage
i. Short term Storage (six weeks). If the AG circulator is not to be
installed immediately after unpacking, then it is to be be stored
in a cool dry dust free location.
ii. Long term storage. If the AG circulator is not to be installed for
period of longer than six weeks after receipt on site, then it is to
be retained in its packing case. If the casing case is disposed
of, then the inlet and outlet connections are to be blanked off
with suitable clean covers to prevent ingress of damaging solids.
INSTALLATION
1. The circulator should always be installed with the circulator
shaft horizontal, see Fig. 1. Direction flow through the
circulator casing is indicated by an arrow.
2. Ensure pipework alignment is correct and the circulator and
pipework are adequately supported. Sharp bends should be
avoided adjacent to the circulator.
3. If circulator is mounted in vertical pipework, flow should be
upwards. If flow is downwards, an air-vent must be fitted at
the highest point before circulator suction. This applies
especially with yellow AGB circulators, which should be vented
regularly.
4. Circulators should never be allowed to operate for a long
period in a closed valve condition.
5. Circulators should never be installed with terminal box facing
downwards. If terminal box is repositioned by rotating head,
care must be taken to ensure the casing “0” ring is correctly
positioned.
6. To avoid accumulation of impurities in the circulator, ensure
that it is not mounted at the lowest point in a system.
7. It is recommended that isolating valves are fitted on either side
of the circulator.
8. System should be thoroughly flushed out to clear any solder,
steel wool, plaster or any other foreign matter that may be
lodged in the circulator.
Technical data
Electrical data: See nameplate
Max. working pressure: 10 bar
Min. static head at 82°C: 2-3m (dependent upon model)
Min. static head at 95°C
4-6m (dependent upon model)
- 15° C to + 120° C.
-15° C to + 65° C, (when used for
secondary hot water)
Temp. Model “C”
a
N
Fig.1
L
Thermal overload
protection
N
L
N
1-phase
L
b
1
NU
V
W
L
a
Thermal overload
protection
b
N
L
U1
V1
W1
W2
U2
V2
1X230/240V
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Summary

Circulator Medium

Safety Precautions

Hot Surface and Venting Warning

Warning about hot surfaces and potential steam/water escape when venting the circulator.

Electrical Safety

Ensures circulator is wired correctly and power is isolated before adjustments.

Personnel Qualification and Training

Transport, Handling, and Storage Instructions

Storage Instructions

Guidance for short-term (six weeks) and long-term storage, including blanking connections.

Installation

Electrical Connection

Venting

Speed Selection

Service and Maintenance

Fault Finding

Declaration of Conformity

Summary

Circulator Medium

Safety Precautions

Hot Surface and Venting Warning

Warning about hot surfaces and potential steam/water escape when venting the circulator.

Electrical Safety

Ensures circulator is wired correctly and power is isolated before adjustments.

Personnel Qualification and Training

Transport, Handling, and Storage Instructions

Storage Instructions

Guidance for short-term (six weeks) and long-term storage, including blanking connections.

Installation

Electrical Connection

Venting

Speed Selection

Service and Maintenance

Fault Finding

Declaration of Conformity

Overview

  1. Function Description
  2. Usage Features
  3. Maintenance Features

The Armstrong AG Series circulator is a robust and versatile device designed for efficient fluid circulation in various systems. Its primary function is to move clean, thin, non-aggressive, and non-explosive fluids, free from solids or fibers, through a closed loop. This makes it suitable for both heating and chilled water applications, as well as secondary hot water systems. The circulator is engineered for reliability and ease of integration into existing pipework.

Function Description

The AG Series circulator operates by means of an electric motor that drives an impeller, creating flow within the system. The motor is typically equipped with electrical regulators, allowing for multi-speed operation (3 or 4 speeds) to optimize performance and energy consumption. The direction of flow through the circulator casing is clearly indicated by an arrow, ensuring correct installation. For systems where the circulated liquid is not pure water, such as those using antifreeze, the circulator's characteristics may change, and consultation with representatives is recommended.

A key aspect of its function is its glandless design, which contributes to its maintenance-free operation. This design minimizes potential leakage points and enhances the overall longevity of the unit. The circulator is designed to handle a range of temperatures, making it adaptable to different system requirements. For optimal performance, it is crucial that the system is properly filled and pressurized, and that the circulator is vented to remove any trapped air before operation.

Usage Features

The AG Series circulator offers several features that enhance its usability and integration into various systems:

  • Installation Flexibility: The circulator should always be installed with its shaft horizontal. However, it can be mounted in vertical pipework, with flow typically directed upwards. If flow is downwards in vertical pipework, an air-vent must be fitted at the highest point before circulator suction, especially for yellow AGB circulators, which require regular venting. The terminal box should never face downwards, but it can be repositioned by rotating the head, ensuring the casing "O" ring is correctly seated.
  • Speed Selection: All circulator motors are fitted with electrical regulators, allowing for 3 or 4-speed operation. The speed plug, which is initially set at maximum, can be readjusted to a minimum speed compatible with efficient system operation. This feature is vital for reducing velocity noise and power consumption. It is important to isolate the motor before adjusting the speed plug.
  • Electrical Connection: A wiring diagram is conveniently located under the terminal box cover lid. PG standard compression glands are provided for cable entry. Motor protection may be required for larger circulators, and if a standard motor starter is used, the overload should be adjusted according to the full load current on the nameplate. Overload settings must be readjusted if the speed is changed. For 3-phase circulators, the direction of rotation should be checked, and if incorrect, any two supply leads should be exchanged. For single-phase circulators, wiring must strictly follow the provided diagram.
  • Venting: Proper venting is critical for efficient operation. After the system is filled and pressurized, and before starting, the circulator must be vented by removing the plug in the center of the nameplate. This process should be repeated periodically until all suspended air is removed from the system water. For single-case twin circulators in horizontal pipework, an automatic air vent can be fitted to the top.
  • System Integration: It is recommended to fit isolating valves on either side of the circulator to facilitate maintenance without draining the entire system. The system should be thoroughly flushed out prior to circulator installation to remove any solder, steel wool, plaster, or other foreign matter that could damage the unit. The circulator should not be mounted at the lowest point in a system to avoid the accumulation of impurities.

Maintenance Features

The Armstrong AG Series circulators are designed to be largely maintenance-free, especially in well-designed systems, promising many years of service. However, certain features and procedures are in place to address potential issues:

  • Seized Shaft Remediation: If the motor shaft seizes due to prolonged disuse or accumulation of magnetite or other impurities, it can often be freed. This is achieved by inserting a screwdriver through the vent plug hole into the slot at the end of the shaft and rotating it.
  • Cleaning and Refilling: In cases where extensive impurities are present, the circulator can be stripped down, cleaned, and the system drained and refilled. This allows for thorough cleaning and restoration of function.
  • Fault Finding Guide: A comprehensive fault-finding guide is provided to assist in diagnosing common issues. This includes troubleshooting for scenarios such as the circulator running but with no flow (often due to air in the system), the circulator not starting (power supply failure, loose electrical connections, or a seized shaft), and noisy operation (incorrect rotation, high circulator speed, low static head, or air in the system). Each fault is accompanied by recommended actions, such as venting the circulator, checking electrical connections, remaking connections, checking rotation, reducing speed, or increasing inlet pressure.
  • Storage Guidelines: For short-term storage (up to six weeks) after unpacking, the circulator should be kept in a cool, dry, dust-free location. For long-term storage (beyond six weeks), it should be retained in its original packing case. If the packing case is disposed of, the inlet and outlet connections must be blanked off with suitable clean covers to prevent the ingress of damaging solids.
  • Personnel Qualification: Personnel responsible for the operation, maintenance, inspection, and installation of the circulator must possess the necessary qualifications for this type of work, ensuring that all procedures are carried out safely and correctly. The owner is also responsible for ensuring that personnel understand the contents of the operation manual.
  • Safety Precautions: The manual emphasizes safety, noting that the surface temperature of the circulator might be hot and that venting could result in a slight escape of hot water or steam. It also mandates that the circulator be wired in line with existing regulations and that the electrical supply be switched off before adjusting the speed plug. When lifting circulators over 25 kg, appropriate lifting equipment and slings must be used.

Armstrong AG Series Specifications

General IconGeneral
ModelAG Series
CategoryWater System
Impeller TypeClosed
Shaft SealMechanical Seal
MaterialCast Iron
Connection TypeFlanged, Threaded
Operating TemperatureUp to 250°F

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