Data Aire DAFC-11 Manual de instalación descargar pdf (Pagina 15)

2.5.2 Dry Steam Humidiﬁ er

Units with optional dry steam humidiﬁ ers require a strainer on the inlet steam line. An outlet con-

nection with a ﬁ eld provided steam trap is also required. Steam pressure is typically 10 to 15 PSI.

2.6 Leak Testing

No installation is complete until the entire system has been thoroughly checked for leaks. This in-

cludes checking refrigerant tubing, ﬂ are ﬁ ttings, pressure controls, shraeder ﬁ ttings and compressor

rotolock service valves. Check both ﬁ eld and factory connections.

In addition to the refrigeration system, check all condenser water lines, humidiﬁ er make-up

lines, condensate drain lines, condensate pumps, chilled water lines, centrifugal pumps

and ﬂ uid cooler (where applicable).

When handling or recovering refrigerant it is not permissible to release refrigerant into the atmo-

sphere. Many leak test methods recommended in the past are longer possible. Current standard

practices must be used.

Pressurize system circuit to 150 PSIG (1034 kPa) by using dry nitrogen with a trace of refrigerant.

Check the entire system for leaks with suitable leak ﬁ nder (per local code) including but not limited

to all braze joints, caps, ﬁ ttings and ﬂ are nuts on both ﬁ eld and factory furnished components. After

completion of leak testing, release test pressure and pull a vacuum on the system.

NOTE: Tightening of ﬁ 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 ﬁ fteen minutes to make sure the micron gauge reading does not go back above 700 microns.

If it does, re-start the vacuum pump and evacuate until the system reaches 250 microns. If the sys-

tem 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 coil 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 re-

frigerant to ﬂ ow until the system pressure equalizes. At this point the system will have 75 to 80% of

the total refrigerant charge. Start the blower (using the manual switches on the unit controller) and

then the compressor checking operating pressure and temperatures.

WARNING: DO NOT APPLY POWER TO THE COMPRESSOR WHEN IN A VACUUM

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 35 36

Sin comentarios

Data Aire DAFC-11 Manual de instalación Pagina 15