Lochinvar 502, 2072 Water connections, Installation & Operation Manual, Circulating pump

Installation & Operation Manual

4 Water connections

Install piping from the filter system to the pool heater as shown in the pool heater piping diagrams. See Figures 34 - 38. Minimum pipe diameter to and from the installed pool heater to the filter system piping on models 502 - 752 is 2" and on models 992 - 2072 Btu/hr the minimum is 2-1/2". The piping from the filter system to the pool heater may be PVC, CPVC or Copper Pipe. The piping from the pool heater back to the filter system will carry water with temperatures in excess of 110°F and must be CPVC or Copper Pipe. The temperature of the heated water from the pool heater will be substantially cooled as it is mixed back into the pool water from the filter system and returned to the pool. The mix of heated water and pool water from the filtration system should only be slightly warmer than the pool water before the connections from the pool heater.

	2" NPT
	WATER
2" NPT	INLET
WATER
OUTLET

INSPECTION

PLUGS

Figure 4-1_Water Connections - Models 502 - 752

2-1/2" NPT

WATER

INLET

2-1/2" NPT

WATER

OUTLET

INSPECTION

PLUGS

TABLE - 4A

Pipe Sizing Chart

502 - 752 Models	Common Pipe Size
Number of units	(Min.)
1	2"
2	3"
3	3 1/2"
4	4"
5	5"
6	5"
992 - 2072 Models	Common Pipe Size
Number of units	(Min.)
1	2 1/2"
2	4"
3	4"
4	5"
5	6"
6	6"

Circulating pump

1.This pool heater is factory supplied with a properly sized pump that circulates water between the pool heater and system.

2.The pump is sized to pool heater input and water hardness. See Water Chemistry on page 45.

3.Lubricate the pump to the manufacturer’s recommendations. Pump damage due to inadequate lubrication is non-warrantable. Use SAE 30 non-detergent oil or lubricant specified by the pump manufacturer.

4.Standard pool heaters are furnished with the following circulating pump mounted in the factory supplied pool loop.

502 - 752 Models

1/4 HP, 120 VAC, 5.8 Amp

992 - 1442 Models

1/2 HP, 120 VAC, 7.4 Amp

1802 - 2072 Models

3/4 HP, 120 VAC, 8.8 Amp

Figure 4-2_Water Connections - Models 992 - 2072		This pump is sized based on installation of a single pool heater
		in close proximity with the system. If the number of fittings and
		straight pipe exceeds the quantities shown in this section, a larger
		pump will be required. As an alternative to changing the pump
		in these circumstances, the piping can be changed to a sub-loop.
		Check pump for correct pump rotation.
	34	The standard pump selection is based on the following pipe and
		fittings from the pool heater to the system: