Carrier 30H Instrucciones de operaciones descargar pdf (Pagina 10)

Water connections

Refer to the certified dimensional drawings for the sizes and

positions of all water inlet and outlet connections. The water

pipes must not transmit any radial or axial force to the heat

exchangers or any vibration to the pipework or building.

The water supply must be analysed and appropriate filtering,

treatment, control devices, isolation and bleed valves and

circuits built in, as necessary. Consult either a water treatment

specialist or appropriate literature on the subject.

Operating precautions

The water circuit should be designed to have the least number

of elbows and horizontal pipe runs at different levels. Below

the basic checks to be done (see also the illustration of a typical

hydraulic circuit below).

• Note the water inlets and outlets of the heat exchangers.

• Install manual or automatic air purge valves at all high

points in the water circuit.

• Use an expansion chamber or an expansion/relief valve to

maintain pressure in the system.

• Install water thermometers in both the entering and

leaving water connections close to the evaporator.

• Install drain valves at all low points to allow the whole

circuit to be drained. Connect a stop valve in the drain line

before operating the chiller.

• Install stop valves, close to the evaporator, in the entering

and leaving water lines.

• Use flexible connections to reduce the transmission of

vibration to the pipework.

• Insulate all pipework, after testing for leaks, both to

reduce thermal leaks and to prevent condensation.

• Cover the insulation with a vapour barrier.

Condenser connections

The condenser is of the multi-tube shell and tube type with

removable water boxes to facilitate cleaning of the tubes.

Before making water connections tighten the bolts in both

heads to the lower torque shown, following the method

described. Tighten in the pairs and sequence indicated

according to the size of bolt (see below) using a torque value at

the low end of the range given.

Pipe connections

After welding the pipes to the flanges previously removed from

the water boxes:

a. Reinstall the pipes and tighten lightly to a torque at the

low end of the range.

b. Fill the system with water.

c. Wait for 10 minutes and check for minor leaks

- at the water box joints

- at the flange joints

d. Drain the system.

e. Disconnect the pipework.

f. Tighten the head bolts to their final torque (middle of the

range) in the sequence illustrated.

g. Reconnect the water pipes, tightening the flange bolts to

the mid-range torque value.

h. Refill the system with water.

i. Pressurize the system.

NOTE: We recommend draining the system and disconnecting

the pipework to ensure that the bolts of the heads to which the

pipework is connected are correctly and uniformly tightened.

If there is a leak outside the water head:

a. Drain the system.

b. Disconnect the water pipes.

c. In the correct sequence, retighten the head bolts to the

maximum torque given for the bolt size.

d. Reconnect the pipework, tightening the bolts to their final

torque value, i.e. the middle value in the range given for

the bolt size.

e. Refill the system with water.

f. Pressurize the system.

Freeze protection

Cooler and water-cooled condenser protection

If the chiller or the water piping is in an area where the ambient

temperature can fall below 0°C it is recommended to add an

antifreeze solution to protect the unit and the water piping to a

temperatures of 8 K below the lowest anticipated temperature.

Use only antifreeze solutions, approved for heat exchanger

duty. If the system is not protected by an antifreeze solution

and will not be used during the freezing weather conditions,

draining of the cooler and outdoor piping is recommended.

Typical hydraulic circuit diagram

Water box tightening

sequence

Bolt size M12 - 71-87 Nm

Bolt size M16 - 171-210 Nm

Bolt size M20 - 171-210 Nm

Sequence 1: 1 2 3 4

Sequence 2: 5 6 7 8

Air vent

Heat exchanger

Drain

Pressure tap

Thermostat sleeve

Flexible connection

Flow switch

Control valve

Filter

Expansion tank

Fill valve

Buffer tank

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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Carrier 30H Instrucciones de operaciones Pagina 10

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