4 Water connections (continued)
Installation with a chilled water system
Pipe refrigeration systems in parallel. Install duct coil downstream at cooling coil. Where the hot water heating boiler is connected to a heating coil located in the air handling units which may be exposed to refrigeration air circulation, the boiler piping system must be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle.
The coil must be vented at the high point and hot water from the boiler must enter the coil at this point. Due to the fast heating capacity of the boiler, it is not necessary to provide a ductstat to delay circulator operation. Also, omit thermostat flow checks as the boiler is cold when heating thermostat is satisfied. This provides greater economy over maintaining standby heat.
Installation & Service Manual
TABLE - 4C
BOILER TEMPERATURE RISE AT MAXIMUM FLOW Temperature Rise at Full Rate Fire, 55 and 90 GPM Maximum Flow
Model | Temperature Rise °F |
497 | 15 @ 55 GPM |
647 | 20 @ 55 GPM |
747 | 23 @ 55 GPM |
987 | 19 @ 90 GPM |
1257 | 24 @ 90 GPM |
|
|
1437 | 27 @ 90 GPM |
1797 | 34 @ 90 GPM |
2067 | 39 @ 90 GPM |
Typical heating boiler installations
General plumbing rules:
1.Check all local codes.
2.For serviceability of boiler, always install unions.
3.Always pipe pressure relief valve to an open drain.
4.Locate system air vents at highest point of system.
5.Expansion tank must be installed near the boiler and on the suction side of the system pump.
6.Support all water piping.
Boiler flow rate
CAUTION The maximum flow rate for Models 497- 747 is 55 GPM and 90 GPM on Models
987 - 2067. Do not exceed the maximum flow rate of the heating boiler. If higher flow rates are required through the boiler, an optional
The heat exchanger is generally capable of operating within the design flow rates of the building heating system. Should the flow rate exceed the maximum allowable flow rate through the boiler an external bypass must be installed. The bypass should be fully sized with a balancing valve to allow for proper adjustment of flow. Flow rate can be determined by measuring the temperature rise through the boiler.
35 
