Duet Installation Guide Notes
1. GENERAL
Installation should be carried out by competent persons adopting
codes of good refrigeration practices as detailed in BS.EN 378-1:2000
Refrigerating Systems and Heat Pumps - Safety and environmental
requirements. Particular care should be taken installing horizontal and
vertical pipe runs incorporating correct bends, traps etc.
2. CONDENSING UNIT
Although the Condensing Unit is rated to operate in an ambient
temperature up to 43°C it is still important to consider the location
of the Unit during installation. Solar Gain from direct sunlight can
raise the temperature inside the unit housing beyond the operating
specification of the unit resulting in loss of performance and possible
damage to equipment.
Equally protection from very low ambient conditions should be addressed
Basically consider protection components such as oil separators, head
pressure control, additional solenoid valves, crankcase heaters etc for
adverse operating conditions.
The Condensing Unit can be positioned at low level ensuring that it is
raised off the ground and mounted on wall fixing brackets. There should
be at least 600mm clearance in front of the unit to allow for adequate
air to the condenser plus access for servicing through the top therefore
at least 600mm clearance should be allowed.
3. PIPE RUNS
The nominal design pipe run for the system is 50 metres however care
should be taken to consider any vertical rise where the condensing unit
is situated above the coldroom. The introduction of “P” traps in the
suction line to aid oil return to the compressor should be considered
also the requirement of an oil separator, especially low temperature
applications. Where the vertical rise is 5 metres and above the use of
an oil separator should be considered, especially on low temperature
applications, plus the position of the oil “P” trap and the size of the
suction line to maximise oil return to the compressor.
4. EVAPORATORS / COOLERS
FTG Range - Ceiling Mounted
These are used for small coldroom applications and are available for
both high and low temperature conditions. The low temperature models
have defrost heaters mounted under the coil block with access via the
drain pan. It will not be necessary to allow space at the side of the
Cooler for heater removal.
Positioning the Cooler should allow the discharged air from the finned
face to circulate around the coldroom. The rear of the Cooler can be
positioned close to the coldroom wall leaving sufficient space to remove
the drain pan. If the opposing wall is less than 600mm from the finned
face of the Cooler a curved air “deflector plate” should be used.
Fit the 1” BSP Drain Connector to the drain pan and connect the drain
line to it.
FKS Range.
These ceiling mounted Coolers are designed for medium/large
coldrooms for both high and low temperature applications.
The cooling air is discharged through the fan motors therefore it should
be positioned within the coldroom allowing at least 450mm clearance
between the rear finned face and the wall for air return to the Cooler.
If the opposing wall is less than 1.5m from the fan motors a curved air
“deflector plate” should be considered depending on model.
5. CONTROL PANEL
The Control panel is supplied with a main’s isolator switch, function
contactors, circuit breaker and a microprocessor temperature
controller complete with 10m long temperature sensing probes. The
air temperature sensing probe should be positioned in the return air
to the finned evaporator coil and the defrost termination temperature
sensing probes (when required) inserted at least 25mm into the finned
coil at the top.
See separate wiring diagrams for the various Condensing Unit /
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Cooler Specification
