National Lab OCGE 111, Operating And Maintenance Manual

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6. OPERATION
6.1 CHECK LIST FOR THE INITIAL START-UP OF WATER RECIRCULATING CHILLERS
After extraordinary maintenance work or after turning off the main switch for more than 1 hour, each start-up
should be treated as an initial start-up.
The initial start-up calls for a number additional checks to ensure safe and reliable performance of the system.
Before start-up
:
Make sure that the pump motor is not blocked: simply move the fan of the pump motor one quarter of a turn.
6.1.1 WATER REQUIREMENTS
Quality:
Standard chillers require water of mains water quality. If no water of mains quality is available, please contact the
manufacturer for advice.
If additives are being used, make sure that these are suitable for use with the materials and components of the
chiller. Note that the quantity of additives may impair the performance of the chiller, e.g. due to unsuitable viscosi-
ty). The pipelines of the water circuit may be made of copper, stainless steel or plastic.
General operating conditions:
In standard recirculating chillers the outlet temperature of the cooling medium must be b5 ± C and +20 ± C.
If temperature values of more than +20 ± C are required for the preset temperature, please contact the manufac-
turer for appropriate adaptations.
Conditions during commissioning:
The inlet temperature of the cooling medium should not be more than +25 ± C.
If temperature values of less than +5 ± C apply to the preset temperature, antifreeze must be used.
The glycol must contain anti-corrosion additives. In the standard configuration, the PCGE series, ethylene glycol in
concentrations of 20% up to a maximum of 34% may be used for minus temperatures down to “ 10 ± C. Add anti-
freeze for ambient temperatures of approx. Ä 0 ± C.
When antifreeze is used, it is important to make sure that the current consumption remains within the data indicat-
ed on the identification plate on the motor.
6.1.2 CHECKLIST FOR PCGE 11 TO PCGE 3300
Controller Type ” A Ü , see 6.4 (PCGE 11 to PCGE 28)
1) Remove the lid panel and the two side panels.
2) Fill the collection tank. Open the tank cap and fill the tank (using a T-fitting if necessary) while watching the level indica-
tor (refer to Fig. 1, Point 5.2.1).
3) Open the filler screw on the pump head.
4) Tighten the screw again when only cooling medium flows out.
5) Open the shut-off valve.
6) Move the main switch of the chiller to position ” 1 ’ . The display will show ” OFF ’ and the pump will start up.
7) Top up the tank again if too much cooling medium has flowed out of the shut-off valve.
8) After a few minutes carefully open the filler screw again in order to remove any residual air. Tighten the screw again af-
terwards.
9) Replace the upper lid panel and the two side panels.
10) Start up the compressor by pressing the button for 3 seconds.
11) Wait until the chiller has attained the operating conditions. This is indicated when the actual temperature shown in the
display matches the preset target temperature.
12) When the chiller is within the operating conditions set by the manufacturer, check whether the electrical absorption of
the chiller agrees with the data indicated on the identification plate and with those contained in the table in the supple-
ment.
Controller Type ” B Ü , see 6.4 (PCGE 31 to PCGE 520)
1) Remove the front plate and the two side panels.
2) Open the tank cap and fill the tank (using a T-fitting if necessary) while watching the level indicator (refer to Fig. 1,
Point 5.2.1).
3) Open the filler screw on the pump head.
4) Tighten the screw again when only cooling medium flows out.
5) Open the shut-off valve.
6) Open the switch cabinet with the key supplied (fastened to the main switch when the chiller is delivered).
7) Ensure that the motor protection switches ( ” MTC ’ and ” MTP ’ ) are in position ” 0 ’ .
8) Fill the tank to the maximum (upper arrow, level indicator is located on the bottom right of the frame). See Section
6.1.1 (Water requirements).
9) Move the motor protection switches ” MTC ’ and ” MTP ’ to position ” 1 ’ .