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It is commonly known that prolonged internal condensation will dramatically shorten the life of standard boilers and
water heaters. While Raypak boilers and water heaters can operate without harmful condensation at lower inlet water
temperatures than the competition, there are still applications that require reliable protection against harmful conden-
sation caused by frequent, extended, cold water start-ups. Raypak’s Cold Water Start protection system utilizes a pro-
portional three-way valve to bypass water from the boiler outlet to the inlet during start-up, when the system return
water temperature is below the minimum acceptable level.
COLD WATER START
Raypak’s Cold Water Start system:
• Continuously monitors and adjusts inlet water temperature to prevent condensation
• Regulates minimum inlet water temperature during system start-up
• Shuts down boiler if the minimum inlet water temperature is not achieved
• Eliminates job site set-up with proprietary self-tuning controller and system-matched components
• Utilizes proportional three-way valve to achieve bypass
• Allows high-temperature system operation without cycling on high-limit
• Activates alarm if shutdown occurs (option)
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Office Buildings •
Factories/Warehouses •
Greenhouses •
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Restaurants •
Weekend Shut-down •
(e.g. 6-day/week shopping center)
Dump Loads •
87% Hot Water Supply Boiler •
Intermittent Industrial Process •
MIN INLET
TEMP SETTING
START-UP
TEMP
BLENDED BOILER
INLET TEMP
SYSTEM RETURN NOW AT
OR ABOVE MINIMUM INLET
SETTING. BYPASS CLOSED,
FULL SYSTEM FLOW
STABLE SYSTEM TEMP
SYSTEM RETURN
TEMPERATURE
TIME
AA PP PP LL II CC AATT II OO NN SS
Boiler Start-Up Cycle