NGW 300 / LGW 300 / GBW 300
9 Repair
903
9.1.2.2 Installation of the U 4851 or Aquavent 6000 S
circulating pump as a replacement for the U
4814 and U 4816 circulation pumps
General information
The U 4814 and U 4816 circulating pumps can be repla-
ced immediately by the U 4851 or Aquavent 6000 S circu-
lating pumps, if necessary. The U 4851, Aquavent 6000 S
and U 4816 circulating pumps are compatible.
When the U 4816 is replaced, the mounting parts (racks
and hose clamps) can be reused. Adjustment of the water
connections is not necessary. The same applies to
compact devices.
When replacing the U 4814 circulating pump, the following
instructions must be followed:
•
The available rack and hose clamp must be removed
and cast aside. The pump must be installed with a
new rack and hose clamp.
•
When mounting the circulating pump close to a wall,
the new rack must be mounted in such a way that the
gap between it and the wall amounts to approx. 60
mm (reference line: centre of the circulating pump).
When necessary, the rack must be attached to the se-
parated rack in a staggered formation.
•
The hose connections must be adjusted.
•
the circulating pump is installed in a compact unit,
•
it is only possible to replace it with difficulty and its
•
operability must be checked separately.
Implementation - U 4851 circulating pump
ATTENTION
When installing the U 4851 circulating pump, the following
directions must be followed without fail. Failure to do so
will exclude warranty claims.
PLEASE NOTE
•
The circulating pump does not ventilate itself. Due to
this lack of automatic ventilation,the pump must be in-
stalled at the lowest point of the water circuit in com-
pliance with the permissible installation position (see
figure).
•
No solenoids or other shut-off valves which could be
closed during the operation of the pump, must be in-
stalled on the water infeed side of the circulating
pump.
•
No solenoids or other shut-off valves which could be
closed during the operation of the pump, must be instal-
led on the water infeed side of the circulating pump.
The same applies to filters which can get clogged.
Before the circulating pump is put into operation the vehic-
le’s cooling system and the pump body must be ventilated
ATTENTION
Improper ventilation or a dry run of the circulating pump
leads to damage to the floating ring seal. Flawless ventila-
tion is detectable, if the pump is working virtually silently.
8° min.
0-82°
0-90°
Permissible installation position
U 4851
Fig. 902 U 4851 circulating pump
