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710.1760.00.02-03A
OIL REQUIREMENTS
Quality:
The oil used for filling the chiller should have a viscosity index in accordance with the standards indicated
in the following table.
CHO Series
≤ ISO32/
Oil/
Outlet temperature
min. +20°C
General operating conditions:
The oil recirculating chiller is designed for cooling medium temperatures of +20°C to +30°C. If the tem-
perature 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 circu-
lation pump. If this is the case, the cooling medium circuit must be adapted accordingly. In such cases,
contact the manufacturer.
CHECKLISTE FOR CHO 29 TO CHO 149
Controller Type "B", see 6.4 (CHO 29 to CHO 149)
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".
9)
Make sure that the oil 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 in-
stalled in order to prevent damage to the pump.
10) Lock the switch cabinet with the key.
11) Move the main switch of the chiller to position "1" (the temperature of the cooling medium is displayed).
Never touch any part of the refrigeration circuit when the chiller is running!
12) Start up the compressor by pressing the
13) Wait until the chiller has attained the operating conditions. This is indicated when the display shows the preset
working range.
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.
15) After a few minutes carefully open the filler screw again in order to remove any residual air. Tighten the screw
again afterwards.
16) Check whether the pressure shown is within the limits specified for the pump. If not, take appropriate action
to ensure that pump is able to run within the specified limits.
17) Wait for the compressor to switch on. The compressor symbol will appear on the display (see Section 6.4).
18) Check the inside of the chiller and the piping system for leakage or loose connections.
19) Fit the front panel and the two side panels back onto the casing.
20) The chiller is normally factory-set to the temperature required by the customer.
21) When the chiller is within the operating conditions set by the manufacturer, check whether the current uptake
of the chiller matches the data indicated on the identification plate and those contained in the table in the
supplement.
6.3
CHECK LIST FOR COMMISSIONING GLYCOL 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.
REQUIREMENTS FOR THE WATER-GLYCOL MIXTURE
Quality:
A water-glycol mixture should be used for filling the chiller (glycol = ethylene glycol). Corrosion-inhibiting
additives may also be included provided they are explicitly authorized for this purpose by the manufac-
turer concerned. The glycol content must be at least 20% and should not exceed 25%.
Tank close to the chiller (max. 2m)
≤ ISO46/
≤ ISO68/
min. +25°C
min. +30°C
button for 3 seconds.
19
Gear pump (option) with remote tank
(>2m)
ISO10÷ISO68
26/11/2012
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