Lochinvar 065, 495, 000 - 2 Water Chemistry, Circulating Pump, TABLE - R Pipe Sizing Chart

Installation and Service Manual

Water Chemistry

The required temperature rise and the standard pump sizing are based on the heating of potable water with a hardness of 5 to 25 grains per gallon and a total dissolved solids not exceeding 350 ppm. Consult the appliance manufacturer when heating potable water exceeding these specifications. Heating of high hardness and/or high total dissolved solids water will require a larger circulating pump, an optional cupro-nickel heat exchanger and a revised temperature rise specification based on the water chemistry of the water to be heated. Water with a hardness of less than 5 grains per gallon will usually have a low pH which can be aggressive and corrosive causing non- warrantable damage to the heater, pump and associated piping. Corrosion due to water chemistry generally shows up first in the hot water system because heated water increases the rate of corrosive chemical reactions.

COLD WATER

SUPPLY

EXPANSION TANK

TABLE - R

Pipe Sizing Chart

495,000 - 745,000 985,000 - 2,065,000

Number	Common	Number	Common
of	Pipe	of	Pipe
Units	Size (Min)	Units	Size (Min)
1	2"	1	2 1/2"
2	3"	2	4"
3	3"	3	4"
4	4"	4	5"
5	5"	5	6"
6	5"	6	6"

Circulating Pump

MIXING VALVE

HOT WATER

SUPPLY

(IF REQUIRED)

1.The water heater must be connected to a properly sized pump that circulates water between the heater and storage tank.

RELIEF

VALVE

RELIEF VALVE

LOCK-TEMP

STORAGE

TANK

CIRCULATING

PUMP 2. The pump is sized to heater input and water hardness. Care should be taken to size the pump correctly. See Water Chemistry on this page.

3.The water heater is equipped with a factory-supplied pump delay system in accordance with the requirements of the latest edition of ASHRAE 90.1.

DRAIN

BUILDING

RETURN

Figure 41 - Typical Water Heater Piping with Storage Tank

4.Lubricate the pump to the manufacturer’s recommendations. Pump damage due to inadequate lubrication is non-warrantable.

5.Standard water heaters are furnished with the following circulating pump. Mount the pump on the unit's inlet water connection.

Pipe Size Requirements

Table-R, pipe sizing chart provides the minimum pipe size for common manifold piping to ensure adequate flow.

495,000 -745,000 Btu/hr Models

1/4 HP, 120 VAC, 5.8 Amps

985,000 -2,065,000 Btu/hr Models

1/2 HP, 120 VAC, 7.4 Amps

ABLE-P

Pipe Sizing Chart

This pump is sized based on installation of a single storage tank and heater in close proximity. If the number of fittings and straight pipe exceeds the quantities shown in this section, a larger pump will be required.

The standard pump selection is based on the following pipe and fittings from the unit to the storage tank:

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