Mitsubishi Heavy Industries ESA30E-25, Technical Manual

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'15 • HM-T-246
4.6 Cleaning procedure of CO
2
water heater gas cooler
Foreign matter, and scaling could build up inside the gas cooler of the unit in which CO
depods depend on water quality. If it becomes too thick, it could effect flow rate and heating capacity. COP could drop or
unstables control could also lead mismatch of hot water outlet temperature compared to the target temperature.
It is recommended to inspect operation data regularly, and wash the gas cooler as follows when dectercoraton of the mentioned
performance due to scaling is detected.
(1)
Necessary tools
Features: Food additive-base. Lowly corrosive to aluminum, SUS and copper materials. Safe to human body.
) Liquid waste vessel (Total recommendation: 00 L, L × times (Washing/neutralization)
) pH meter or pH test paper
) P rotective equipment (P rotective glasses, gloves, mask)
) Hose attachment kit (P CM00A00) × set
) O ring (P CMC00A) × pcs, drain valve (P CMD00) × pcs.
Example of acid washing
• Outline of circuit and parts are as shown below.
• Materials resistant to chemicals (acid)
Power source
Gas cooler
Acid solution tank
Acid
resistant
feed water
pump
Control
Acid washing equipment
Piping
Dimension: 20A or equivalent
Material: Rigid polyvinyl chloride
Measurement of return water volume
It must be able to measure the volume
of return water with a vessel, etc.
Drain valve, 2 pcs.
Manual closing 3-way
valve x 2 pcs.
Solution tank
Capacity: 45 L or equivalent
Material: Plastics box
Power source circuit breaker
with flow control inverter
Connecting pipe, 2 pcs.
Pipe connection for hose is
locally procured shown below.
Dimension: 20A or equivalent, 5 m
Material: Braided hose
Pipe end: Utilize the hose
attachment kit (PCM008A020)
for the joint to gas cooler.
Acid resistant feed water pump, 1 unit
Type: SANSO PMD1511B2E or equivalent
Flow rate: 15 – 20 L/min
Head: 10 m (Gas cooler heat exchanger 3 m + )
Circulating solution: Acidity (pH2 – 8)
Water type
heat
exchanger
57mm
35mm
14mm
3/4 11.5
EA124GC-23
10mm
16.2mm
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