HP 403349-003 - Manual (Page 72)

Removal and replacement procedures 72
12. Pull the HEX unit out toward you.
To replace this component, see "Replacing the heat exchanger unit with ball valves (on page 72 )."
Replacing the heat exchanger unit with ball valves
CAUTION: The heat exchanger unit weighs 23.6 kg (52 lb) with the additional weight of the
water. Use extra caution when removing and replacing the top heat exchanger unit because it
might be higher than your shoulders and is heavy and awkward to lift.