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 condensation caused by frequent, extended, cold water start-ups.
COLD WATER RUN For the same reason stated for Cold Water Starts, it is even more important to provide protection against condensation from cold inlet water on systems where the return water temperature to the boiler will always be below the acceptable minimum. Raypak’s Cold Water Run system utilizes a variable-speed pump to inject just the right amount of water from the main system loop into the boiler to maintain the optimum inlet temperature.
COLD WATER START BOILER BOILER PUMP 3-WAY VALVE TO SYSTEM Cold Water Start J-Box Assembly FROM SYSTEM SYSTEM PUMP Typical Cold Start Plumbing Pictorial-Not to Scale COLD WATER RUN BOILER BOILER PUMP VARIABLE SPEED INJECTOR PUMP TO SYSTEM Cold Water Run J-Box Assembly SYSTEM PUMP FROM SYSTEM Typical Cold RunPlumbing Pictorial-Not to Scale
TECHNICAL DATA COLD WATER START TYPICAL BOILER PIPING* * Items required for cold water operation are shown. Other standard system components have been omitted for clarity. COLD WATER RUN TYPICAL BOILER PIPING* * Items required for cold water operation are shown. Other standard system components have been omitted for clarity.
TECHNICAL DATA MULTIPLE UNIT COLD WATER START Total System Load (MBTUH) 500-900 901-1,800 1,801-3,000 3,001-4,000 4,001-6,000 6,001-8,000 Three-Way Diverting Valve Specifications Valve Size Cv GPM 2” NPT 57 70 2-1/2” NPT 74 100 2-1/2” NPT 100 150 4” Flange 152 220 4” Flange 254 330 4” Flange 327 440 P 3.5’ 4.2’ 5.2’ 4.8’ 3.9’ 4.2’ Notes: 1. Maximum of 4 boilers per system. 2. Many variables can impact the proper valve sizing for multiple boilers. This sizing is provided as a guide.
