DP DHC -M Series Installation And Operating Manual - Page 2

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Installation and operating manual

This installation guide gives basic instructions which are to be observed during

installation, operation and maintenance of the pump. 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

Application

DHC Pumps are available with automatic regulation (DHC-A) and with manual

regulation (DHC-M). The DHC-BM series is suitable for tap water and the DHC-CM

series for hot/cold water applications.

Pump medium:

Clean, thin, non-aggressive and non-explosive fluids without any solids or fibres.

Antifreeze products without mineral oil (special model upon request).

Please note: If any liquid other than water is being pumped, we recommend that

you contact DP-Pumps or their representatives as the pump characteristics may

change.

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)

Medium temperature (C)

- 15°C to + 120°C

Medium temperature (B)

- 15°C to + 65°C

* except DHC25-30/40 and single phase pumps DHC40-90 and above, max.

medium temperature 100°C

Safety

- The surface temperature of the pump might be hot!

- When venting the pump (Fig. 5), it could result in a slight escape of

hot water or steam!

- Pump should be wired in line with the existing regulations.

- The electrical supply to the pump is to be switched off before

adjusting the speed plug.

Per

raining

Personnel responsible for installation, operation, maintenance and inspection of

the pump 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)

DHC15-40 to DHC40-80, max 43 dB(A)

DHC40-90 to DHC80-110, max 55 dB(A)

Glandless circulators

Series: DHC -M

Installation

1) The pump should always be installed with the pump shaft horizontal (Fig. 1).

Direction of flow through the pump casing is indicated by an arrow.

2) Ensure pipe work alignment is correct and the pump and pipe work are adequately

supported. Sharp bends should be avoided adjacent to the pump.

3) If pump is mounted in vertical pipe work, flow should be upwards. If flow is downwards,

an air-vent must be fitted at the highest point before pump suction. This applies

specially with tap water applications, which should be vented regularly.

4) Pumps should never be allowed to operate for a long period in a closed valve condition.

5) Pumps 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 O-ring is

correctly positioned.

6) To avoid accumulation of impurities in the pump, ensure that it is not mounted at the l

owest point in a system.

7) It is recommended that isolating valves are fitted on either side of the pump.

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 pump.

Electrical Connection

A wiring diagram is located under the terminal box cover lid (Fig. 2). PG standard

compression glands are fitted to allow cable entry to the terminal box. The larger pumps

need overload protection. When wired through a 132 Starter, overload protection is

automatically achieved, immaterial of speed selected, using terminals "a" and "b",

fitted in the terminal box. Note: If standard motor starter is used, the overload should be

adjusted in accordance with the full load current shown on the pump nameplate.

Overload must be readjusted when speed is changed.

After wiring, direction of rotation should be checked by removing plug in the centre of the

nameplate (Fig. 5) which will reveal the motor shaft. If incorrect, exchange any two supply

leads, on 3-phase pumps. On single-phase pumps check that units are wired strictly in

accordance with (Fig. 2). If the system is not filled with water, pump should only be run

for a short period to prevent damage to pump bearings which are lubricated by system

water.

Venting

Once the system has been filled and pressurised, if required, and before starting up, the

pump must be vented by removing the plug positioned in the centre of the nameplate

(Fig. 5). After venting the vent plug must be tightened before starting the pump. This

process should be repeated periodically, until all air held in suspension in the system,

has been removed. On single-case twin pumps mounted in horizontal pipe work, it is

possible to fit an automatic air vent to the top part of the pump easing.

Speed Selection

All pump motors fitted with electrical regulators, are wound suitable for 3- or 4-speed

operation (Fig. 3a, 3b, 3c). The regulator must only be operated when the motor is

isolated. All pumps are supplied with speed plugs set at maximum performance. Speed

plug should always be readjusted to minimum speed, compatible with efficient operation

of the system. This will ensure minimum velocity noise and minimum power consumption.

Manually regulated pumps should also be readjusted (Fig. 4).

Service/Maintenance

DP's DHC circulator range of glandless pumps are maintenance free and in a well

designed system, should give many years of service. If motor shaft is seized as a

result of pump standing for a long period without use, or by the accumulation of

magnetite or other impurities, it should be freed. Insert a screwdriver through vent

hole into the slot in the end of the shaft and rotate (Fig. 5). Pump can also be

stripped down and cleaned, system drained, flushed out and refilled.

Failure table

Fault

Pump running

Pump will

not start

Pump noisy

Declaration of Conformity

We, DP-Pumps, hereby declare that our glandless circulators type DHC-M are in

conformity with:

- Directive 2006/95/EC on the harmonisation of the laws of Member States relating

to electrical equipment designed for use within certainvoltage limits.

- Directive 2004/108/EC on the harmonisation of the laws of the Member States

relating to electromagnetic compatibility.

- Directive 2006/42/EC on the harmonisation of the laws of the Member States

relating to construction and making of machines.

If further information is required, please contact DP-Pumps or their representatives.

Used EN standards: EN 60335-1, EN 60335-2-51, EN 61000-6-4,

EN 61000-6-2:2002 and EN 809, EN 16297-1: 2012, EN 16297-2: 2012

BE00000512-A / version 11/2012

Wil Ouwehand

Technical Director

Cause

Action

Vent pump

Air in system.

and system

Power supply

Check starter and

failure. Loose

fuses. Remake

electrical

connections.

See above

Seized shaft

Service/Maintenance.

Incorrect rotation.

Check rotation and

correct.

Pump speed

Reduce speed

too high.

regulator setting.

Static head too

Increase inlet pressure.

low.

Vent pump and

Air in the system.

system