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, 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 relief 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 Smart View 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.
10.4 -
Installation
IMPORTANT: When the 30RQP units operate in heating mode,
dehumidification of the room air and defrosting of the air heat
exchangers generate a large amount of condensate that must
be evacuated from the unit installation site.
The 30RQP units must be installed on waterproof base that
allow efficient drainage and the evacuation of the condensate
from the heat exchangers.
At low ambient temperature, when the air heat exchangers
form frost, the defrost water must be collected to ensure that
there is no risk of flooding of the area where the 30RQP heat
pumps are installed.
All the fans on the same refrigeration circuit are controlled by a
variable speed drive and therefore run at the same spped.
Each refrigerant circuit (A and B) must have a separate ducting
system to prevent any air recycling between the air heat
exchangers of the different refrigerant circuits.
Each fan of the 30RQP unit with option 12 is equipped with a
factory-installed connection interface, allowing the connection to
the ductwork.
Please refer to the unit dimensional drawings for the exact
dimensions of the connection interface.
Please refer to the section 9.12 - "Fan arrangements” to affect
each fan to its own circuit.
45
Summary of Contents for Carrier 30RQM 160
Page 63: ......
