33
Installation and Servicing
SECTION 3 - SERVICING
3.6 PRIMARY STRAINER REMOVAL, CLEANING & REPLACEMENT
1.
Drain the CH circuit as per Section 3.5.
2.
Unscrew the head of the gauge using the
brass nut at the rear of the gauge.
3.
Screw the new gauge to the front of the
isolation valve. At least 2 threads after
the sealing ring must be engaged.
4.
Check that the HIU operates in both
DHW & CH modes.
3.7 CH PRESSURE GAUGE REPLACEMENT (INDIRECT ONLY)
1
1.
Isolate and drain primary circuit
– refer to Section 3.5.
2.
Refer to Section 3.4 for front
panel removal.
3.
Completely unscrew the strainer
cap and retract strainer carrier
from body.
4.
Clean the mesh, replace if
required.
5.
Ensure O-ring is debris and
damage free, replace if required.
6.
Reassemble in reverse order.
7.
Refill circuit and check for leaks.
8.
Check that the HIU operates in
both DHW & CH modes.
2
3
SER
VICING
