National Lab PCGE Series, Руководство по эксплуатации и техническому обслуживанию

Страница: 17 / 194

17
8) Make sure that the water is able to circulate adequately. It the circuit might be interrupted by something such as a valve,
electrical valve, a filter or anything else, a by-pass circuit (automatic overflow valve) must be installed in order to pre-
vent damage to the pump.
9) Check the inside of the chiller and the piping system for leakage or loose connections.
10) Move the motor protection switches ” MTC ’ and ” MTP ’ to position ” 1 ’ .
11) Lock the switch cabinet with the key.
12) Move the main switch of the chiller to position ” 1 ’ (the temperature of the cooling medium appears on the display).
Never touch any part of the cooling medium circuit when the chiller is running!
13) Start up the chiller by pressing the button (LED lights up).
14) Because the pump starts up immediately, make sure that the direction of rotation for the pump matches the direction of
the arrow on the casing. If it is rotating in the opposite direction, turn off the main switch of the chiller immediately and
arrange for the polarity of the chiller to be reversed.
Do not carry out any work inside the chiller if the main switch is in the
”
ON
ü
position!
15) Make sure that the water is able to circulate adequately.
16) Check whether the pressure shown is within the limits specified for the pump. If not, take appropriate action to ensure
that pump is running within the specified limits.
17) Start up the chiller by pressing the button (LED no longer lights up).
18) Check the inside of the chiller and the piping system for leakage or loose connections.
19) Fill the tank up to the maximum.
20) Fasten the tank cap afterwards.
21) Fit the two side panels back onto the casing.
22) Start up the chiller by pressing the button (LED lights up).
23) Wait for the compressor to switch on. The compressor symbol will appear on the display (see Section 6.4).
24) 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.
25) Check the preset target value. The chiller is normally factory-set to the temperature required by the customer.
26) When the chiller is within the operating conditions set by the manufacturer, check whether the current uptake of the
chiller agrees with the data indicated on the identification plate and with those contained in the table in the supplement.
6.2 CHECKLIST FOR STARTING UP OIL RECIRCULATING CHILLERS
After turning off the main switch for more than 1 hour or after extraordinary maintenance work, each chiller start
should be regarded as an initial start-up.
The initial start-up calls for a number additional checks to ensure safe and reliable performance of the system.
6.2.1 OIL REQUIREMENTS
Quality:
The oil used for filling the chiller should have a viscosity index in accordance with the standards indicated in the fol-
lowing table.
OCGE Series Tank close to the chiller (max. 2m)
Gear pump (option) with remote tank
(>2m)
Oil/
Outlet temperature ≤ ISO32/
min. +20 ± C
≤ ISO46/
min. +25 ± C
≤ ISO68/
min. +30 ± C
ISO10 ÷ ISO68
General operating conditions:
The oil recirculating chiller is designed for cooling medium temperatures of +20
± C to +30 ± C. If the temperature
values deviate from these, please contact the manufacturer.
Conditions during commissioning:
The use of oil with a higher viscosity and lower cooling temperatures may cause overloading of the circulation
pump. If this is the case, the cooling medium circuit must be adapted accordingly. In such cases, contact the man-
ufacturer.
6.2.2 CHECKLISTE FOR OCGE 31 TO OCGE 240
Controller Type ” B Ü , see 6.4 (OCGE 31 to OCGE 240)
1) Remove the front plate and the two side panels.
2) Connect the supply devices or the external tank. Make sure that the level of the contents is higher than the pump to
support the automatic priming system. Use a T-fitting if necessary for filling (refer to Fig. 1, Point 5.2.1). One essential
requirement is the availability of a suitable vent opening for the system, particularly for chillers with gear pumps.
3) Open the filler screw on the pump head.
4) Tighten the screw again when only oil 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) Move the motor protection switches of the chiller to position ” 1 ’ .