HuRay HI-DELTA 2342ACE, Инструкция по установке и обслуживанию

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HANDLING MANUAL SERVICE MANUAL
RAYPAK HI DELTA BOILERS/WATER HEATERS
WITH FAN ASSISTED PREMIX BURNERS
64
4.5. HEAT EXCHANGER ASSEMBLY AND CLEANING
Follow these instructions for removing the heat exchanger
on site of the installation for cleaning or reversing the
water connection side
- Disconnect electric power leading to the
appliance!
- Close the gas cock leading to the appliance!
- Label than remove electric wires leading to the
flow switch!
- Remove both in/out and return header access
panels!
- Remove the sensor of the manual high limit,
automatic high limit and external controller
eventually! Pay attention to the soundness of the
capillary bulbs!
- Remove releasable water connections to the
header and remove discharge piping from the
pressure relief valve!
- Remove the flange nuts and the in/out header!
- Remove the flange nuts and the return header!
- After removing both headers the heat exchanger
tubes be inspected and cleaned mechanically!
Upon removing further parts the complete heat
exchanger can be slipped out toward the front of
the appliance when needed.
- For changing the water connection sides reverse
the headers!
- Use new kit of silicone O-rings for the
reassembly! Seat them on the tubes with their flat
side pushed against the tube sheets, the bevel
facing outward!
- Push the header firmly against the O-rings, install
and tighten the flange nuts onto the stud bolts
until finger tight!
- Tighten the nuts in several steps evenly! Work
around header sequentially, as indicated on the
picture! Torque all nuts to 34 Nm. Do not over-
tighten!
- Lead capillary bulbs and external sensors to the
new side of the water connection! Beginning with
HD 1802 ACE, the manual high limit and the
automatic high limit must also be replaced to the
opposite side of electric control box due to the
limited length of the capillary tube. Use a tiny bit
of heat-proof grease in the blank sleeves for
assuring correct heat transfer to the sensors!
- The heat exchanger is factory tested for 12 bar
operating pressure. However, it is recommended
that after dismantling and reassembly again, fill
up the system with water first and test against
pressure drop for 24 hours, before filling in
expensive
antifreeze! Stop any leakage
immediately!
!
Cleaning the heat exchanger is also possible
without removing the headers by using a non-
attacking descaling chemical that must not
damage the materials in the heat exchanger
and must be allowed by the local regulations.
The use of Hydrochloric-acid is forbidden in
all circumstances! Removal of the return
header after cleaning is highly recommended
to inspect the result of the work.