Data Aire gForce GT series - Dry Steam Humidifier Piping; Leak Testing Procedures; System Evacuation

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Thehumidierhasadrainatthebottomwhichisfactorypipedtothemaincondensatedrainline.
Thedispersiontubealsohasadrainline.Noadditionaleldpipingisrequired.
2.5.2 Dry Steam Humidier
Theoptionaldrysteamhumidierrequiresastrainerontheinletsteamline.Anoutletconnection
witheld-providedsteamtrapisalsorequired.Steampressureistypical10-15PSI.
2.6 Leak Testing
No installation is complete until the entire system has been thoroughly checked for leaks. This
includescheckingtherefrigeranttubing,arettings,pressurecontrols,Shraederttingsandcom-
pressorrota-lockservicevalves.Checkboththeeldandfactoryconnections,
Inadditiontorefrigerationsystem,checkallcondenserwaterlines,humidierwatermake-
up lines, condensate lines, condensate pumps, chilled water lines, centrifugal pumps and
uidcooler(whereapplicable).
When handling or recovering refrigerant it is not permissible to release refrigerant into the
atmosphere. Many leak-test methods recommended in the past are no longer possible.
Current standard practices must be used.
Pressurize the system’s circuit to 150 PSIG (1034 kPa) by using dry nitrogen with a trace of refrig-
erant.Checktheentiresystemforleakswithasuitableleaknder(perlocalcode)includingbut
notlimitedtoallbrazejoints,caps,ttings,andarenutsonbotheldandfactoryfurnishedcom-
ponents. After completion of leak testing, release test pressure and pull a vacuum on the system.
Tighteningofttingsandvalvesistheresponsibilityoftheinstallingcontractor.
2.7 Evacuation
Evacuate the refrigerant lines, condenser coil and evaporator coil to 250 microns or lower (a micron
gauge and 2-stage vacuum pump are required). Valve off and turn off the vacuum pump and wait at
least 15 minutes to make sure the micron gauge reading does not go back above 700 microns. If it
does, restart the vacuum pump and evacuate until the system reaches 250 microns. If the system
still does not hold the pressure below 700 microns the system needs to be rechecked for leaks.
After the system has been satisfactorily evacuated the lines can be charged with refrigerant. Con-
nect the pressure gauge manifold set to the high and low ports near the compressor. Connect the
charging line to the refrigerant tank and set it for liquid feed. Open the refrigerant tank valve and
purge the line at the manifold, then open the high side valve on the manifold only and allow the
refrigeranttoowuntilthesystempressureequalizes.Atthispointthesystemwillhave75to80%
of the total refrigerant charge. Start the blower and then the compressor checking the operating
pressures and temperatures.
DO NOT APPLY POWER TO THE COMPRESSOR WHEN IN A VACUUM