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10 - OPTIONS
10.1 - Hydraulic module without variable speed
(options 116R, 116S, 116T, 116U)
The hydraulic module is composed of the system's main hydraulic
components: factory-fitted screen filter, safety relief valve and
water pump. The fixed speed operating pressure pump provides
the nominal flow rate for the installation's water loop.
Several types of water pump are available to suit all applications:
single or dual low pressure pump, single or dual high pressure
pump. The nominal flow of the system should be adjusted using
a manual control valve provided by the client. The safety valve
placed on the water inlet pipes at the pump inlet limits the
pressure to 400 kPa (4 bar).
A screen filter that can be easily removed is placed at the pump
inlet and protects the pump and the plate heat exchanger against
solid particles that are greater than 1.2 mm.
Supplementary options can be ordered if necessary:
-
Option 42A: Protection of the water heat exchanger and
hydraulic kit down to outdoor temperatures of -20°C.
-
Option 293: Expansion tank for water circulation
system.
CAUTION: The use of the hydraulic kit on open loop systems
is prohibited.
10.2 - Hydraulic module with variable speed (options
116V, 116W)
The composition of the hydraulic kit is similar to that in the
previous section (§10.1). In this case, the pump is controlled by
a variable frequency drive that allows adjustment of the pump's
nominal flow according to the chosen control mode (constant
pressure or temperature differential, fixed flow) and the system
operating conditions.
CAUTION: The use of the hydraulic kit on open loop systems
is prohibited.
10.3 - Units with fans with operating pressure for indoor
installation (Option 12 - Fan with high static pressure)
This option applies to 30RQP 160-520 units installed inside the
building in a plant room. For this type of installation, the cold or
hot air leaving the air heat exchangers is discharged by the fans to
the outside of the building, using a duct system that causes a pressure
drop in the air path.
Therefore this option features more powerful fan motors than those
fitted to standard units.
For each installation, the duct pressure drops differ, depending on
the duct length, the duct section and the direction changes. 30RQP
units with option 12 are designed to operate with air discharge ducts
with maximum pressure drop of 200 Pa (units are equipped with
variable-speed fans with a maximum speed of 19 r/s, instead of 15.8
r/s for standard units).
Use of variable speed up to 19 r/s can overcome the duct pressure
drop while maintaining an optimized air flow per circuit. All fans in
the same circuit, operating at the same time, have the same speed.
The power supply for fans with a speed of 19 rps is increased compared
to that of standard fans with a speed of 15.8 rps
(the multiplier coefficient is the same as the cube of the speed ratio,
i.e. x 1.72).
In the cooling / heating mode, the full-load or part-load speed is
controlled by a patented algorithm that permanently optimizes the
condensing / evaporating temperature to ensure the best unit energy
efficiency (EER / COP) whatever the operating conditions and
pressure drop of the system ductwork.
If necessary for a specific installation, the maximum fan speed of
30RQP unit can be fixed between 13.3 and 19 r/s, using the Service
Configuration menu. Consult the 30RQM/RQP Touch Pilot Control
manual for this modification. The maximum configured speed applies
to both the cooling and heating modes.
The performances (capacities, efficiencies) depend on the speed of
the fans, then on the duct pressure drop:
•
Between 0 and 100 Pa, the unit performance is only slightly
affected
•
Between 100 and 200 Pa, the unit performance may vary
considerably, depending on the operating conditions (outdoor
air temperature and water conditions).
The noise level into the ductwork and radiated around the unit
is also related to the pressure drop.
Please refer to the Carrier Electronic catalog to evaluate the
impact of the estimated duct system on the 30RQP unit operating
conditions.