Section 5
Recirculation System
20479279
9-2010/Rev 02
6-7
Operating Temperature Adjustment (Oil-to-Water Models)
The cooling water flow through the heat exchanger is regulated by the water modulating valve, a
manually adjusted, thermostatic control valve. The valve is factory set to maintain the operating
oil temperature at 115 F (46 C). It is adjusted by increasing or decreasing the spring tension on
the valve.
NOTE
In most cases, adjustment will be required during commissioning and with
seasonal changes to the cooling water temperature.
Figure 5-6: Water Modulating Valve
1. Locate the adjusting knob, a screwdriver slot on the top of the valve.
2. Use a flat screwdriver and turn counter-clockwise to compress the spring, slowing water
flow and increasing temperature. Or; turn clockwise to reduce spring tension, increasing
water flow and decreasing the temperature.
3. Monitor the sight gauge on the side of the reservoir until the adjusted temperature can be
determined. It will take some time for the temperature in the oil reservoir to change.
4. Repeat steps 2 and 3 if necessary.
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