45
There is a fault signal on the wire
controller.
Find out the fault type and take corresponding
measures.
Excessive frost on the air
heat exchanger
Failure of four-way valve or sensors.
Check operation and replace if necessary.
Air short circuit.
Eliminate the cause of air short circuit.
3. Maintenance
Main parts maintenance
Pay attention to the suction and exhaust pressure of system during operating. Determine
the reason for
the abnormality
.
Check whether the electrical wiring is loose, or if the contacts are oxidized, or if the wire insulation is
damaged; replace and repair as necessary. Always pay attention to the working voltage, current and
phase balance
.
Inspect systems and replace failed components in a timely manner
.
Descaling
All domestic hot water systems will experience scale build up over time. Scale build up can affect the heat
transfer performance and lead to increased power consumption, excess exhaust pressure (or low suction
pressure), and premature equipment failure. To avoid these concerns, these units are equipped with 1”
NPT ports on the supply and return headers to allow quick and easy connection for preventative
maintenance. To remove surface deposition of calcium oxide or other minerals from the heat exchangers
it is recommended to use descaled agents using formic acid, citric acid, acetic acid and other organic acid
cleaning.
NOTE: Any cleaning solvent should comply with FDA G.R.A.S standards. Never use cleaning agents
containing fluoride chlorate because the galvanized pipe on the water side is easily corrode, leading to
leakage of refrigerant. When descaling pay attention to the following aspects:
The waterside heat exchanger must be cleaned by professionals
.
After using cleaning agents, properly flush the system with clean water.
Properly dispose of waste fluids and particles.
Cleaning agents and neutralizing agents can have corrosive effects on the eyes, skin, mucous
membranes of the nose, etc. Therefore, protective devices (such as goggles, protective gloves,
protective masks, protective shoes, etc.) must be used in the cleaning process to prevent inhalation or
contact with agents
.
Power off in winter
See “Winter Freeze Protection” on page-13.
The following preparations shall be made when the unit is restarted after any prolonged outage
:
•
Thoroughly inspect and clean the unit.
•
Clean the plumbing system.
•
Inspect water pump, regulator and other equipment of water piping system.
•
Tighten all wire connections.
Summary of Contents for ccHPWH Series
Page 11: ...8 III Product specification 1 Dimensions Unit inch ccHPWH275 S ccHPWH275 D ...
Page 12: ...9 ccHPWH550 S ccHPWH550 D ...
Page 26: ...23 2 Wiring diagram ccHPWH275 S ccHPWH275 D ...
Page 27: ...24 ccHPWH550 S ccHPWH550 D ...
Page 42: ...39 Schematic diagram of control wiring and code dialing of each module ...