Operation Of Two Units In Master/Slave Mode; Major System Components And Operation Data For Standard Units; Compressors; Lubricant - Carrier Pro-Dialog Plus 30HZ Installation, Operation And Maintenance Instructions

6.7 - Operation of two units in master/slave mode

The control of a master/slave assembly is in the entering
water and does not require any additional sensors (standard
configuration). It can also be located in the leaving water. In
this case two additional sensors must be added on the com-
mon piping. All parameters, required for the master/slave
function must be configured using the Service Configura-
tion menu.
All remote controls of the master/slave assembly (start/stop,
set point, load shedding etc.) are controlled by the unit con-
figured as master and must only be applied to the master
unit.
Each unit controls its own water pump. If there is only one
common pump, in cases with variable flow, isolation valves
must be installed on each unit. They will be activated at the
opening and closing by the control of each unit (in this case
the valves are controlled using the dedicated water pump
outputs). See the 30HZ/HZV Pro-Dialog Plus Control IOM
for a more detailed explanation.
30hZ/hZV with configuration: leaving water control
legend
1 Master unit
Slave unit
2
Control boxes of the master and slave units
Water inlet
Water outlet
Water pumps for each unit (included as standard for units with hydronic
module)
Additional sensors for leaving water control, to be connected to channel 1 of
the slave boards of each master and slave unit
CCN communication bus
Connection of two additional sensors
22
7 - MajOR sysTEM COMPONENTs aND OPERaTION
DaTa FOR sTaNDaRD UNITs

7.1 - Compressors

30HZ/HZV units use reciprocating, semi-hermetic com-
pressors. As standard, each compressor is equipped with:
• a discharge valve
• a suction valve
• an oil crankcase heater with a safety device that shuts
off the compressor in case of a fault
• a discharge line muffler
• anti-vibration mounts
With options 5 and 6 (low leaving brine temperature) each
compressor is equipped with a thermostat controlling the
discharge gas temperature. This sensor is activated, if the
temperature exceeds the safety limit and shuts off the com-
pressor (cut-out: 146°C; cut-in: 115°C).

7.2 - lubricant

The compressors installed in these units have an oil charge
(9 l) to ensure their correct operation.
Check that the oil level is between 1/8 and 3/8 up the sight
glass before start-up and after normal unit operation.
NOTE: Use only oils which have been approved for the
compressors. Never use oils which have been exposed to air.
Recommended oils:
• Carrier specification: PP 47 26
• Mobiloil EAL 68 (original charge)

7.3 - Pressure vessels

7.3.1 - Condensers (30hZ units)
The condensers (one per circuit) are shell-and-tube conden-
sers. They have been tested and stamped in accordance with
the applicable pressure code for a maximum refrigerant-
side operating pressure of 3200 kPa and for a water-side
operating pressure of 1000 kPa.
The seamless copper tubes are finned on the refrigerant
side, and expanded onto the tube sheets.
For option 150A (heat pump), the condensers have a thermal
insulation of 19 mm thick polyurethane foam.
The condenser shell can have a thermal insulation of 19 mm
polyurethane foam, and can be equipped with a water drain
and purge.