11
DRYVAC
2
25/50/100 B Manual
GA 01.415/2.02 - 7/97
Section 2 — Installation
Figure 9
Connection side
Figure 10
Shipping Seals
2.3 Connecting the
Cooling Water
The cooling water should have the following properties:
pH............................................................. 7.0 to 8.5
Chloride (Cl
–
) .......................
≤
75 mg/l = 2.1 mmol/l
Sulfate (SO
4
–2
) ......................
≤
70 mg/l =0.7 mmol/l
Calcium ions ....................... > 1.0 mmol/l = 100 ppm
≤
2.7 mmol/l = 268 ppm
Hydrogencarbonate hardness ............ 125 – 179 ppm
Significant deviations from the recommended values
may result in premature corrosion or deposits.
Connect the cooling water lines. Ensure that your water
supply line is connected to the DRYVAC
2
water inlet and
your drain line is connected to the DRYVAC
2
water outlet
(see Figure 9).
Caution
Operation without cooling water will
damage the pump.
Note:
Special modifications may be required when using
deionized (DI) water. Consult your Leybold sales or ser-
vice representative for information.
Note:
If you will be using a closed-loop cooling system,
flush out the DRYVAC
2
's cooling water to remove any re-
sidual rust before connecting the pump to your cooling
system; also add a rust inhibitor to the cooling water.
2.4 Checking the Direction
of Rotation
Caution
Don’t remove the shipping seals un-
til you are ready to install the pump.
The pump’s interior must be pro-
tected against humidity for as long
as possible.
Check the direction of rotation as follows:
1. Remove the shipping seals from the intake port (see
Figure 10) and ensure that the pump's intake and ex-
haust ports are open. Save the shipping seals for fu-
ture use.
Key to Figure 10
1 Shipping cap
2 Drying canister
3 Gasket
4 Sealing disc
