Temptek G-500 Series, Instruction Manual

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Temperature Control Unit : VTO Series with G500 Series Instrument
Page: 15
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
C. The factory recommend minimum operating water supply pressure requirement is a
minimum of 20 PSI. To protect the unit from operating without adequate supply water, a
water pressure switch is plumbed into the supply manifold. If the supply pressure is not
sufficient, the pressure switch will prevent unit operations.
D. On all units, cooling water circulates to the supply manifold, through the pump adapter
cooling jacket, and is then rejected to the drain manifold. This action maintains proper
pump seal cavity temperatures.
E. On units with the installed cooling option, a tube and shell heat exchanger for process
fluid cooling is supplied and mounted to the expansion tank.
1. The purpose of the heat exchanger is to cool the process fluid. Cooling water
from plant water supply circulates through the “tube” side of the heat exchanger.
The process fluid circulates through the “shell” side. Cooling water flow is
controlled by the solenoid valve.
2. A 1/2” ball valve is placed in the heat exchanger water supply line after the
solenoid valve. The ball valve should be open during operations from 100°F to
200°F. During operations with temperatures over 200°F, this valve should be
closed. In such cases, the necessary cooling water is proportioned to the heat
exchanger through the small capillary line, which some water “steams off” to cool
the process fluid. The steam and water mixture is then rejected to drain.
2.4 WATER DRAIN CONNECTION:
A. Connect the unit’s Water Drain port to one of the following, determined by the water
supply source:
1. Open water drain for well or city water supply.
2. Tower water system return for tower system water supply.
3. Chilled water system return for chilled water system supply.
B. The factory recommends a minimum of 20 psi pressure differential between the water
supply and water drain line for proper cooling.
1. For units equipped with the cooling feature, the amount of cooling provided by
the unit depends on:
a. Cooling heat exchanger size.
b. The cooling valve size
c. The pressure differential across the valve
d. The temperature difference between the unit set point and the cooling
water temperature
2. Consult factory when selecting the correct cooling valve for your application.