Cold Water Start

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.

Boiler Start-Up Cycle

BLENDED BOILER

INLET TEMP

MIN INLET

TEMP SETTING

START-UP

TEMP	TEMPERATURE

TIME

STABLE SYSTEM TEMP

SYSTEM RETURN NOW AT OR ABOVE MINIMUM INLET SETTING. BYPASS CLOSED, FULL SYSTEM FLOW

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)

APPLICATIONS

Commercial Hydronic Heating

Office Buildings •

Factories/Warehouses •

Greenhouses •

Domestic Hot Water Supply

Restaurants	•
Weekend Shut-down	•
(e.g. 6-day/week shopping center)
Dump Loads	•
87% Hot Water Supply Boiler	•
Intermittent Industrial Process	•