77
Outdoor Unit Functions
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Pump Out (SE2, Po)
The Pump Out function pushes refrigerant from a malfunctioning outdoor unit to other outdoor
units, indoor units, and the building piping system. Use this function if an outdoor unit com-
pressor fails, if a part is defective and needs to be replaced, or if there is a leak. In systems
with short piping systems, the refrigerant amount that can be pumped from the outdoor unit
will be limited, and additional refrigerant storage containers will need to be used. Set Pump
Out mode on the master outdoor unit, but all outdoor units will function while the system is in
Pump Out. For use on both heat pump and heat recovery systems.
• Use the Pump Out function while ambient conditions are within the manufacturer’s operating temperature ranges:
Indoor Units = 50~89.6°F; Outdoor Units = 41~104°F.
•
Do not run the indoor units in thermo off mode during Pump Out (in case low pressure does not satisfy levels).
• Maximum operation time of Pump Out takes two (2) to five (5) minutes after the compressor starts.
1. If low pressure falls below 33.2 psi, the system will automatically turn off. Immediately close the vapor service valve of all outdoor units
(Heat Pump systems only). (See figures above.)
2. If low pressure falls below 44.5 psi (light will blink), immediately close the vapor service valves of all outdoor units.
Yes
No
Low pressure
>33.2 psi.
*Current low
pressure
*Current low
pressure
Liquid
Pipe
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Open
Closed
Open
Low Pressure
Vapor Pipe
High Pressure
Vapor Pipe
Liquid
Pipe
Not Used
(Keep Closed)
Vapor
Pipe
Liquid
Pipe
Not Used
(Keep Closed)
Vapor
Pipe
Liquid
Pipe
Low Pressure
Vapor Pipe
High Pressure
Vapor Pipe
Outdoor Unit Service Valves for Heat Recovery
System Pump Out
Outdoor Unit Service Valves for Heat Pump
System Pump Out
Outdoor Unit Service Valves for Heat Recovery
System After Pump Out Is Complete
Outdoor Unit Service Valves for Heat Pump
System After Pump Out Is Complete
Operate the system in all indoor unit heating.
Choose SE2, Po, and then press the red
6:&FRQILUPƔEXWWRQ
Keep the liquid service valves to each
outdoor unit closed. See figures at right for
instructions on which vapor service valve is
WREHRSHQIRUZKLFKV\VWHP
Reset power, then turn No. 5 on the master outdoor unit PCB
',3VZLWFKEDQN6:WR216HOHFWWKH³6Y&´PRGHE\XVLQJ
WKH6:&IRUZDUGŹEXWWRQDQG6:&EDFNZDUGŻEXWWRQV
*Low pressure <44.5
SVLOLJKWZLOOEOLQN
Pump down complete.
Close service valves.
Is the low pressure target satisfied.
Press the red SW01C
ƔEXWWRQWRFRQILUP
Turn all indoor units and outdoor units off.
Turn No. 5 on the master outdoor unit
3&%',3VZLWFKEDQN6:WR2))
Reset power.
OTHER CONTROLS
Setting Optional Modes
Settings
Function
oFF (Default)
Pump Out is not enabled.
Po (on)
Pump Out is enabled.
Display Will Show Low
Pressure.
Table 40: Setting the Pump Out Function.
