Temptek CF Series - Page 28

CF Series Portable Chiller : Air & Water-Cooled : 5 - 40 Tons
Page: 28
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Email: service@Temptek.com
C. PROCESS FLOW ADJUSTMENTS
1. Theoperatormustdetermineandsetproperwaterowrateforthemostefcient
and trouble free operation.
a. Waterowratethroughtheprocessisdeterminedbythepressurelosses
intheprocessloop.Generally,higherowratesresultinturbulentow
achieving maximum temperature control and lower maintenance. Since
theevaporatorinmostliquidchillersisowsensitive,theefciencyof
operationisdirectlyrelatedtotheowofliquid.
b. Maximumchillerefciencyisobtainedatapproximately2.4gpmper
tonofratedcapacity.Lowliquidowcanreduceefciencyandinsome
cases allow ice to develop in the evaporator which can damage the
evaporator.Excessiveliquidowwilltripthemotoroverloadprotection
circuit.
2. Switch on the illuminated ON/OFF SWITCH to activate the process pump. Wait
a few moments to allow air to be purge from system. Observe the COOLANT
pressuregaugeforsteadyreadout.Checkunitforlowandhighow..
3. LOW FLOW
 Ifalowowconditionispresent,besureallprocessvalvesareopen.Ifall
processvalvesareopenandalowowconditionsexists,considerthefollowing:
a. Lowowcancausethelowrefrigerantpressurelimitswitchtotrip.
b. Tooperateunderalowowconditionitisnecessarytoinstallaow
bypassintheprocesscircuitry.Thiswillallowaportionoftheowto
bypass the process and return directly to the chiller. This keeps the total
owabovethecutoffpoint.Theillustrationbelowshowatypicalbypass
loop.
c. Some models may have a factory installed bypass. Follow the instruction
inparagraph“d”belowtoadjustthelowowbypass.
d. Adjusting the Low Flow Bypass:
For Manual Low Flow Bypass Valves: Start with the bypass completely
closed and gradually open the valve until the low refrigerant pressure
Typicallowowby-passloop