INTERLOCK
All units have an interlock incorporated innt othe control circuit, brought out to
two terminals. These terminals are shorted out for factory testing.
On site the shorting loop is removed and two wires taken out to a pair of
voltage free contacts in the water pump starter/contactor/relay or flow switch
so that the heatopump cannot operate unless the water pump is operating.
(See fig 5).
FIG 5
1. REMOVE LINK BETWEEN TERMINALS 8 AND 9 IF SOFT START FITTED
2. REMOVE LINK BETWEEN TERMINALS 6 AND 7 IF VOLT FREE CONTACTS USED
METHOD OF WIRING EXTERNAL INTERLOCK
1834 BHCS
SOFT
START
POOL
PUMP
MAINS SUPPLY
VOLTAGE
FREE
CONTACTS
NORMALLY
OPEN
(RATED 10A AT 250V)
WHITE WIRES
TO SOFT START
(IF FITTED)
FACTORY FITTED
LINKS
8
9
6
7
Remove front
service panel
1/4 turn fasteners)
Mains supply in
1834 mains terminal
block and earthing point
(also external interlock)
1 2 3 4 5 6 7
N
L1
L2
L3
Pool pump
interlock
flow switch
or soft start
CALOREX HEAT PUMP AW1834BHC
Fig. 4B
19
SD331852 ISSUE 7
