Viessmann BWT 241.A Series, Installation And Service Instructions Manual

Page: 75 / 124

75
Cylinder drain & fill valve positions
A
B
C
A
Cylinder drain & fill valve closed
B Cylinder drain & fill valve open to
drain the internal DHW line
C
Cylinder drain & fill valve open to
drain or fill the cylinder
Draining the heat pump on the secondary side
1. Close the on-site drain & fill valve. 2. Drain heat pump at secondary flow
drain valve (see page 73).
Checking sensors
For sensor connections to the controller
and sensor PCB, see page 42. For the position of the sensors in the heat
pump, see diagram on page 73.
Troubleshooting
Repairs
(cont.)
5601 598 GB
Service