Specifications

Section-5 Maintenance
November 11, 2013
5‐36
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypowerpriortoservicing. 888‐2628‐300
5.13.6 CoolantMaintenance
ThepHlevelofthe50/50glycol/watermixtureshouldbeabove8.0.APHlevelthatisbelow8.0indicatesthatthe
inhibitorsintheglycolareineffective.ShouldthePHlevelofthemixturedropbelow8.0eitheradditivesmustbe
addedorthecoolantshouldbechanged.ThePH
levelshouldbecheckedquarterlywitheitherpHpaperorwitha
pHmeter.Ifthesetestitemsarenotavailableasampleofthecoolantcanbesenttoanindependentlaboratoryfor
analysis.ThepHlevelandthe50/50glycol/waterratioshouldbothbecheckedat3month
intervals.
5.13.7 ChangingPumps
STEP 1 Ifpossibleturnoffthetransmitterand pumpmodule.Thisisthesafestapproach.If
turningoffthetransmitterandpumpmoduleisnotdesirablethebadpumpcanbe
changedwhilethegoodpumpisinservice.
STEP 2 Turnoffthepumpmodulecircuitbreakerassociatedwiththepumptobereplaced.
STEP 3 Closetheball(isolation)valvesoneithersideofthepumpthatistobechanged.
STEP 4 Disconnectthefittingsoneithersideofthepump.
Note
A small amount of liquid will still be present in the pipe and pump housing, and a receptacle (bucket) will
be necessary to contain the spillage.
Warning
WEAR SUITABLE PROTECTIVE GLOVES AND EYE PROTECTION WHEN REMOV-
ING THE FITTINGS. LOOSEN FITTINGS SLOWLY SINCE THE COOLANT MAY BE
UNDER PRESSURE. THE COOLANT MAY ALSO BE HOT.
STEP 5 Removeandreplacethepump.Takecaretoinstallthepumpsothedirectionofflow
ismaintainedintheproperdirection.
Caution
USE PIPE JOINT COMPOUND OR TEFLON TAPE ON MALE THREADED
FITTINGS AS REQUIRED PRIOR TO REINSTALLATION OF PUMP. USE JOINT
COMPOUND SPARINGLY TO AVOID CONTAMINATION OF COOLANT. IF
FITTINGS WITH O-RING SEALS ARE USED THE O-RINGS SHOULD NOT BE
REUSED. USE A NEW O-RING AND LUBRICATE IT LIGHTLY WITH SILICON
GREASE.
STEP 6 Performtheabovest epsinreverseordertorestorethecoolingsystemtonormal
operation.
STEP 7 Oncesystemoperationisrestoredcheckthesightglasstobesurethatairbubblesare
notpresentandthatthelevelofcoolantisadequate.Chargesystemasrequiredto
maintaincoolantlevel.
STEP 8 Endofprocedure.
5.13.8 PumpModuleOperationWithoutTransmitter
Thepumpmodulecanbeoperatedindependently,withoutbein gattachedtothetransmitter,byselectingthe
LOCALmodeonthepumpmodule/heatexchangercoolingcontrolpanel.
Caution
SELECTION OF LOCAL WILL ALSO ALLOW THE PUMP MODULE/HEAT
EXCHANGER TO BE OPERATED FROM THE CONTROL PANEL AS LONG AS
THE PUMP INTERLOCK IS NOT ACTIVE.