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17.10 - Fixed-speed pump
This pump is factory-installed as standard to guarantee the
nominal flow in the water loop. It is a fixed-speed pump with
available system pressure. See the pump flow/pressure curves
in chapters 10 and 11.
The nominal system flow rate must be adjusted with a manual
control valve supplied by the customer (see chapters 10 and 11
on the control of the nominal water flow rate).
The maximum permitted concentration of the glycol additives
(ethylene glycol or propylene glycol) is 35%.
The maximum pump suction pressure is limited to 300 kPa (3
bar) due to the valve installed on the entering water piping.
The use of any other glycol type additives must be approved
by Carrier.
ATTENTION: Use of hydronic kit in an open loop is forbidden.
17.11 - Variable-speed pump
This pump is factory-installed. It is a variable-speed pump
with available system pressure. See the pump flow/pressure
curve.
The system flow rate is automatically adjusted via the
frequency converter built into the pump, based on the heat
rejection load on the drycooler.
The maximum permitted concentration of the glycol additives
is 35%.
The maximum pump suction pressure is limited to 300 kPa (3
bar) due to the valve installed on the entering water piping.
The use of any other glycol type additives must be approved
by Carrier.
ATTENTION: Use of hydronic kit in an open loop is forbidden.
17.12 - Evaporator and condenser pump suction filter
Filter positions in the unit
All pumps are protected by a suction filter. This is easily
removable to recover solid particles. It protects the pump and
the plate heat exchanger against solid particles with a size
exceeding 1,2 mm. Before the unit start-up it is important to
turn the evaporator and condenser pump to decontaminate
the water loops of any solid pollution.
A specific pump start-up function in the Quick Test menu is
available for this task.
17.13 - Connection sleeves
Position of the water connection sleeves in the unit
17.14 - Option 272: High-temperature water production
with glycol solution
ATTENTION: The temperature sensor positioned in the
discharge for option 272 is specific to this unit and must
not be interchanged with another temperature sensor. For
replacement please contact the Carrier service team.
17.15 - Outside air temperature sensor
30WGA units require information about the outside air
temperature. This is needed for correct system operation
(EXV, fans, condensing temperature, setpoint).
In units without control of the remote condenser (standard),
the sensor (25 m) is supplied with the control box of the
30WGA and must be installed near the air-cooled condenser.
In units with control of the remote condenser (option 154),
the sensor is supplied with the option and must be installed
near the air-cooled condenser.
The position of the temperature sensor must be chosen with
great care and must be representative of the outside tempera-
ture (limit any other source that could have a negative
influence on the control: gusts of wind, other heat sources
such as sun radiation and hot air recycling).
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