10
Electrical (machine wiring and supply)
Electrical
All electrical work to be carried out in accordance with I.E.E.
standards, latest issue, or local codes of practice as applicable.
The machine should be installed in accordance with
EMC2004/108/EC.
Protected supply
To incorporate fuses or motor type circuit breakers (Type GU,
FAZC) to specified rating, (see Data Sheet). H.R.C. fuses are
recommended. An isolator which disconnects all poles must be
fitted within 2m and in sight of machine.*
All units must be correctly earthed-grounded and an earth
leakage trip installed.
Inconsistent electrical supply
The following limits of operation must not be exceeded if
Calorex machines are to be guaranteed either in performance or
warranty terms.
Note
All machines are fitted with a
phase protection relay
and will not run if the phases are not connected in correct order (phase
sequence) or if the supply voltage is 15% less than the nominal voltage. (415V for 3N~ 50Hz) . The lamp on the phase rotation relay,
situated in the electric box, is illuminated when the phases are correctly connected and the voltage is sufficient. The under voltage
protection feature is not present in phase protection relays fitted in 220V 3~ 60Hz machines.
Voltage
Minimum
Maximum
Three-phase machines (UK)
360V
440V
Three phase machines (60Hz)
187V
253V
Three phase ma N (60Hz)
360V
440V
Cycle frequency (50Hz)
47.5Hz
52.5Hz
Cycle frequency (60Hz)
57.0HZ
63.0Hz
N.B. This voltage must be available at the heat pump whilst
running.
The voltage must not drop below the above figures when
starting the machine.
*Note the isolator must have a minimum of 3mm air gap when
turned off.
Fig. 4
Location of mains input and external interlock terminals
Interlock
These units have an interlock circuit incorporated into the
control circuit, brought out to two terminals. These terminals are
shorted out for factory testing.
On site the shorting loop is to be removed and two wires
taken to a pair of volt free contacts in the water pump starter/
contactor/relay or flow switch so that the heat pump cannot
operate unless the water pump is operating.
(See figures 5 and 6).
