Vacuuming And Charging - McQuay SB250B Installation Manual

Indoor Unit
Outdoor Unit
Voltage range**
Power Supply Cable*
Number of Conductors
a) Indoor Unit
b) Outdoor Unit
Interconnection cable*
Number of conductors
IMPORTANT: The figures shown in the table are for information purpose only. They should be checked and selected
*
to comply with the local/national codes of regulations. This is also subject to the type of
installation and conductors used.
** The appropriate voltage range should be checked with label data on the unit. ETL listed is only applicable
to 60Hz power supply only.
SB150BR/200BR/250BR/300BR/350BR/400BR/500BR
DS4 DS4
DS3 DS3
DS2 DS2
DS1 DS1
Indoor Unit
HP4 HP4
HP3 HP3
HP2 HP2
HP1 HP1
!
The electrical power must be
provided with protection device
(circuit breaker or fuse) with pole
separation system and minimum
contact gap of 3mm.
Vacuuming is necessary to eliminate all moisture and air from the system. The series II Outdoor Unit is provided with
flare valve fittings.
Vacuuming
Before vacuuming, perform leak check for refrigeration
circuit. After the system piping are properly connected,
connect the flexible hoses to the correct charging nipples as
shown in the diagram. Ensure that flexible hose from charging
nipples are connected to the vacuum pump via standard
servicing valves and pressure gauges (gauge manifold).
Vacuum the air conditioner system to at least 500 microns
Hg. Do not start the unit when the system is engaged in
vacuuming.
Charging
Before charging, the vacuum must be held at 500 microns Hg
for at least 15 minutes, then break vacuum by charging R-22
refrigerant. Operate the unit for 15 minutes and ensure the
refrigerant charges is of correct by monitoring running current,
gas and liquid line pressures. Suction and discharge pipe
pressure should be in the region of 75 psig and 275 psig
generally.
After ensuring the system is correctly charged, remove flexible
hose from charging nipples and replace caps.
SB150BR/200BR/250BR/300BR/350BR/400BR/500BR
380V-415V / 1Ph / 50Hz
N2
COMP2
OF2
4WV2
Indoor Unit
N1
DS DS
COMP1
HP HP
OF1
4WV1
N
T
S
R
Power Supply

VACUUMING AND CHARGING

1-10
5
5
8
N
L
COMP
OF
4WV
N
T
S
R
Power Supply
Gas Pipe
Liquid Pipe
Gas Pipe
Liquid Pipe
Outdoor Unit
Vacuum Pump