MAINTENANCE CHECKLIST
Environment
❏ For products using R290 refrigerant, room for use and maintenance needs to be
greater than 15 square meters.
❏ “Danger: No Smoking, No Open Flame” signs are hung up. Flame or heat within
2 metres of the maintenance area is to be prevented. No smoking.
❏ Maintenance area shall always be well-ventilated.
❏ As the specific weight of R290 is larger than air, the ground shall be level and
free from pits to prevent accumulation of R290 gas.
❏ Maintenance areas must be equipped with R290 concentration alarms at low
positions, which shall not be covered.
❏ Two or more fire extinguishers must be prepared at easily accessible locations.
❏ Ventilators, switches, breakers and other electrical devices need to be
explosion-resistant.
❏ All devices must be reliably grounded with secure wires.
Personnel
❏ Maintenance personnel must receive professional training.
❏ Maintenance personnel must have maintenance qualifications recognized by the
local government.
❏ Maintenance personnel are wearing flammable gas testers in maintenance;
alarm value is set as 5% LEL (lower explosion limit).
❏ Maintenance personnel are wearing goggles and gloves.
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