PB Heat Gas Boiler manual Water Piping and Controls, Operating Parameters, System Components

WATER PIPING AND CONTROLS

3. WATER PIPING AND CONTROLS

A.GENERAL

1.The water supply and return piping of this appliance are to be sized according to system requirements. Do not use piping smaller than the boiler connections.

2.In hydronic systems where sediment may exist, install a strainer device in the boiler return piping to prevent large particles and pipe scale from entering the boiler heat exchanger coil. Use a large mesh screen in the strainer.

4.Expansion Tank: An expansion tank (such as a Bell & Gossett Series HFT) is required to provide room for expansion of the heating medium (water or glycol solution). Consult the expansion tank manufacturer's instructions for specific information regarding installation. The expansion tank is to be sized for the required system volume and capacity. In addition, be sure that the expansion tank is sized based on the proper heating medium. Glycol solutions may expand more than water for a similar temperature rise.

3.Install this boiler so that the gas ignition system components are protected from water (dripping, spraying, etc.) during appliance operation and service (circulator replacement, condensate trap cleaning, control replacement, etc.).

B.OPERATING PARAMETERS

1.The Pinnacle boiler is designed to operate in a closed loop hydronic system at approximately 15 psi. A pressure limit in the boiler header will prevent the unit from operating if the pressure drops below 10 psi. This is to keep the appliance from operating in the event of a system leak or other condition in which water is not flowing through the heat exchanger.

2.Table 3.1 shows minimum water flow rates for Pinnacle boilers. If a glycol solution is to be used, contact the factory for minimum flow rates.

Table 3.1 – Minimum Flow Rate and Water Volume

Boiler	Total Water	Minimum Flow
Model	Volume-Gallon (Liter)	Rate-GPM (LPM)
PI-T50	0.50 (1.89)	2 (7.6)
PI-T80	0.63 (2.40)	4 (15.2)
PI-80	0.63 (2.40)	4 (15.2)
PI-140	0.93 (3.50)	6 (22.7)
PI-199	1.13 (4.26)	8 (30.3)

C.SYSTEM COMPONENTS

1.Figure 3.1 shows the symbol key for piping diagrams in this section. The following are brief descriptions of system components.

2.Pressure/Temperature Gauge: A combination pressure/temperature gauge is provided with each Pinnacle boiler to be mounted in the piping from the boiler supply to the system. Most local codes require this gauge.

3.Air Elimination: Any closed loop hydronic system in which the Pinnacle boiler is installed must have an air elimination device. As the system water is heated, dissolved oxygen and carbon dioxide will separate from the liquid. An air elimination device (such as a TACO 430 Series Air Scoop with automatic air vent) is required to remove the dissolved gasses from the system preventing corrosion in the piping system and eliminating system noise.

CAUTION

Use only inhibited propylene glycol solutions which are specifically formulated for hydronic systems. Unlike automotive antifreeze, solutions for hydronic applications contain corrosion inhibitors that will protect system components from premature failure due to corrosion.

WARNING

Use only inhibited propylene glycol solutions which are specifically formulated for hydronic systems. Ethylene glycol is toxic and may cause an environmental hazard if a leak or spill occurs.

5.Y-Type Strainer: In older systems where a significant amount of sediment may be present, it may be necessary to install a Y-type strainer. The strainer should be checked often and cleaned during the first few months of operation to assure that sediment does not reach the heat exchanger and clog the passages. Use a large mesh screen in the strainer.

6.Flow Control Valve: Flow control valves such as the TACO Flo-Chek or Bell & Gossett Flo-Control™ are used to prevent gravity circulation by incorporating a check valve with a weighted disc.

7.Pressure Reducing Valve: A pressure reducing valve, such as the Bell & Gossett B-38 or a TACO #329, is used in a hydronic system to automatically feed water to the system whenever pressure in the system drops below the pressure setting of the valve. These valves should not be used on glycol systems unless close supervision of the glycol solution is practiced.

8.Back Flow Preventer: A back flow preventer (check valve) is required by some jurisdictions to prevent the hydronic system water from backing up into the city water supply. This is especially important on systems in which glycol solution is used as the heating medium.

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