Armstrong response 2000 Petunjuk Pemasangan & Pengoperasian - Halaman 3

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Operation

Never operate this unit with guards or parts missing.

Once the unit has been commissioned, it will

operate automatically in the following modes:

Continuously Normal, Continuously Economy

or Timed Set Back (if fitted).

The unit can also be switched ON/OFF from a remote

timed or direct signal. On twin pump units rotate lead

pump at regular intervals to equalise wear and prevent

seizing.

Units with 40/50mm Pumps

Pumps used within the unit contain an internal thermal

contact. If this contact operates it will cause the

appropriate circuit breaker to operate, the appropriate

TRIPPED indicator to illuminate and lock out the pump

until manually reset.

Units with 32mm Pumps

Pumps used within this unit contain an internal thermal

contact. If this contact operates, it will cause the pump

to stop running, when the contact resets, the pump will

resume normal operation. No visual indication is given

for this condition.

NOTE: If the package has not been fitted internally with

a secondary circulation pump, one must be fitted in the

system pipework to maintain circulation whilst the

system is in use.

Maintenance

Ensure that the unit is electrically isolated

before any maintenance is carried out.

Plate Pack

If after a period of time, the plate pack is found to be

leaking, the plates can be tightened further. It is

essential that we are informed, and advice shall be

given regarding the 'A' minimum dimension. (See Fig. 1)

The guide bars at the top and bottom of the plate heat

exchanger and the threaded plate pack clamping bolts

should be kept clean and lightly greased. It is

occasionally necessary to strip down the plate heat

exchanger for inspection and cleaning.

Procedure as follows:

Close the unit isolating valves and remove the

front and two side covers from the unit, this will

provide adequate access to the plate heat

exchanger.

Ensure the plate pack is at ambient

temperature.

Drain the heat exchanger as much as possible,

using the appropriate drain valves.

Release the clamping bolts gradually and

uniformly, so that the frame plates are kept as

parallel as possible. Continue until the clamping

bolts can be removed.

Separate the mobile pressure plate away from

the plate pack and avoid personal injury or

damage to the plate.

Access to ind ividual plates is now possible.

Care should be taken when removing these

plates so as not to damage the gaskets. Make a

note of the plate order and orientation to ensure

correct re-assembly.

Deposits on the heat transfer plates can be

removed with a scrubbing brush and rinsed with

clean water. A steel wire or carbon steel wool

brush must never be used.

The plates can be cleaned with a soda solution, or with

a solution of water and a synthetic detergent. After

cleaning, the plates must be thoroughly rinsed with

clean water. Other chemical cleaners can be used, but

check first that they are not harmful to plate or gasket

material.

If lime deposits have occurred on the service medium

side, this can be removed as follows:

Open up the heat exchanger (at room

temperature) and apply a fine coat of 10% Nitric

Acid solution to the plates. Let the acid solution

soak in for 1 minute, then rinse and wash the

plates clean. If necessary, repeat the treatment.

When all deposits have been removed, brush

the plates with a dilute Sodium Hydroxide, or

Caustic Soda solution.

Finally rinse the plates with clean water.

Sterilisation with active chlorinated agents involves the

risk of damage to stainless steel. If sterilisation with

Hypochlorite or other chlorinated agents is specified, the

concentration of active chlorine must not exceed 100pm

and the temperate must not exceed 20?C. Circulation

time should be restricted to 10 minutes only.

If the gaskets require replacing this can be done

by unclipping the existing gaskets, cleaning the

plate grooves and fitting the new gaskets. Care

should be taken to ensure that the gaskets are

the correct way up, compare the position with

the old gasket.

When-re-assembling the plate pack, ensure that

the gasket side of the plates face the fixed end

of the frame. The plates are placed in the frame

according to the plate arrangement details. The

plates are numbered from the fixed end of the

frame. The first plate, plate number one, is

referenced as a D -plate. All 4 port holes are

surround by gaskets, thereby preventing liquid

from entering the space between the plate and

the fixed end frame plate. The second plate

within the pack is reference as type B, the third

is referenced as type A, the fourth is referenced

as type B and so on. (All odd numbered plates

are generally type A, whilst all even numbered

plates are generally type B). The last plate in

the plate pack is a blank plate, i.e. no port

holes. The mobile pressure plate is then re-

fitted and the clamping bolts positioned.