Grohe Rainshower F-Series 27 251 Manual page 38

Prevention of frost damage
When the domestic water system is drained, the thermostat
mixers must be drained separately, since non-return valves
are installed in the hot and cold water connections.
The complete thermostat assembly and non-return valves
must be disassembled and removed.
Maintenance
Important note: If the control unit is to be removed from
the rough-in for servicing, first close the inlet stops then
open the flow control to allow any internal pressure to be
released from within the unit.
Inspect and clean all parts, replace if necessary and grease
with special valve grease.
Close the integrated service stops!
11
12
7
English
I. Non return valves, see Figs. [11] and [12].
Install in reverse order.
Open the integrated service stops!
Replacement parts, see page II (* = special accessories).
Care
Instructions for care of this faucet will be found in the Limited
Warranty supplement.