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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. This approach allows the full
capacity of the boiler to be utilized to meet the system load, while at the same time continuously maintaining the opti-
mum inlet water temperature to prevent condensation.
Boiler Start-Up Cycle
BLENDED BOILER
INLET TEMP
MIN INLET
TEMP SETTING
SYSTEM RETURN
START-UP
TEMP
TIME
Raypak’s Cold Water Run system:
•
•
•
•
•
•
Continuously monitors and adjusts inlet water temperature to prevent condensation
Regulates minimum inlet water temperature regardless of system temperature
Shuts down boiler if the minimum inlet water temperature is not achieved
Protects boiler from constant low return water temperatures with its proprietary self-tuning controller
Utilizes variable-speed injector pump to control boiler loop temperature
Activates alarm if shutdown occurs (option)
A P P LICA TIO N S
•
•
•
Pool Heating
Low-temperature Industrial Process
Very Low-temperature Return Water
(e.g. convalescent hospital domestic
hot water)
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COLD WATER START
BOILER
BOILER
PUMP
3-WAY
VALVE
TO
SYSTEM
FROM
SYSTEM
SYSTEM
PUMP
Cold Water Start J-Box Assembly
Typical Cold Start Plumbing
Pictorial-Not to Scale
COLD WATER RUN
BOILER
BOILER
PUMP
VARIABLE SPEED
INJECTOR PUMP
TO
SYSTEM
FROM
SYSTEM
SYSTEM
PUMP
Cold Water Run J-Box Assembly
Typical Cold RunPlumbing
Pictorial-Not to Scale
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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.
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TECHNICAL DATA
MULTIPLE UNIT COLD WATER START
Three-Way Diverting Valve Specifications
Total System Load
(MBTUH)
Valve Size
2” NPT
Cv
57
GPM
70
ꢀP
3.5’
4.2’
5.2’
4.8’
3.9’
4.2’
500-900
901-1,800
2-1/2” NPT
2-1/2” NPT
4” Flange
4” Flange
4” Flange
74
100
150
220
330
440
1,801-3,000
3,001-4,000
4,001-6,000
6,001-8,000
100
152
254
327
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. When in doubt consult the factory.
3. Multi-unit system ALWAYS shipped loose- Not available mounted.
4. 4” flanges, bolts and gaskets supplied by others. Multi-units with 4” valves are to be used on hydronic heating only. The valve body is cast
iron.
Catalog No.: 1000.19C Effective: 06-15-08 Replaces: 01-01-07
Raypak Inc., 2151 Eastman Ave., Oxnard, CA 93030
(805) 278-5300 Fax (800) 872-9725
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