Carrier AquaForce PUREtec 61XWHLZE 03 - Flow Control; Evaporator and Condenser Water Box Bolt Tightening; Operation of Two Units in Master;Slave Mode

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7 - WATER CONNECTIONS
7.3 - Flow control
Evaporator ow switch and chilled water pump interlock
IMPORTANT: The unit water ow switch must be energised,
and the chilled water pump interlock must be connected.
Failure to follow this instruction will void the Carrier
guarantee.
The water ow switch is installed on the evaporator water inlet
and adjusted by the control. If adjustment is necessary, it must be
carried out by qualied personnel trained by Carrier Service.
Terminals 34 and 35 are provided for eld installation of the chilled
water pump interlock (auxiliary contact for pump operation to be
wired on site).
7.4 - Evaporator and condenser water box bolt
tightening
The evaporator (and condenser) are of the shell and tube type
with removable water boxes to facilitate cleaning. Re-tightening
or tightening must be done in accordance with the illustration in
the example below.
NOTE: Before this operation we recommend draining the
circuit and disconnecting the pipes to be sure that the bolts
are correctly and uniformly tightened
Water box tightening sequence
Legende
1 Sequence 1: 1 2 3 4
Sequence 2: 5 6 7 8
Sequence 3: 9 10 11 12
Sequence 4: 13 14 15 16
2 Tightening torque
Bolt size M 16 - 171 - 210 Nm
7.5 - 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 conguration). It
can also be located in the leaving water. In this case two additional
sensors must be added on the common piping.
All parameters, required for the master/slave function must be
congured using the MST_SLV menu.
All remote controls of the master/slave assembly (start/ stop, set point,
load shedding etc.) are controlled by the unit congured 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 ow, 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 Touch Pilot control
manual for a more detailled explanation.
61XWH with conguration: leaving water control
1
2
Legend
1
Master unit
1
Slave unit
Control boxes of the master and slave units
Water inlet
Water outlet
Water pumps for each unit (included as standard for units with hydraulic
module)
Additional sensors for leaving water control, to be connected to channel
1of the slave boards of each master and slave unit
CCN communication bus
Connection of two additional sensors