Lochinvar 45 Minimum Pump Performance, Heat Exchanger, Remote Sensor Installation Instructions

3.The pump must run continuously when the burners are firing.

4.Lubricate the pump to the manufacturers recommen- dations. Pump damage due to inadequate lubrica- tion is non-warrantable.

5.A standard water heater/hot water supply boiler is furnished with a 1/6 HP, 120 VAC, 3.6 AMP circulating pump to be mounted on the units inlet water connection. 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:

6	- 90° elbows	2 - ball valves
2	- unions	1 - cold water tee

Plus the following length of straight pipe based on the heater size:

90,000 thru 360,000 Btu/hr Models Not more than 45 feet of straight pipe

399,999 thru 500,000 Btu/hr Models Not more than 25 feet of straight pipe

For every elbow and tee in excess of those shown above, DEDUCT 5 FEET from maximum allowable straight pipe in heater to tank circulating loop.

MINIMUM PUMP PERFORMANCE

Based on heating potable water with a hardness of 8 to 25 grains per gallon and total dissolved solids not exceeding 350 ppm. See “Water Chemistry”, page 40.

BTU/hr INPUT	GPM	Ft. Hd.
90,000 - 500,000	30	8

The sensor must also be connected to two blue wires provided in the upper left-hand corner of the control panel. It will be necessary to add additional wire to reach from the appliance to the remote water source. Use twisted pair wire, minimum 18 gauge or larger. See Table O, page 38 regarding distance versus wire gauge.

EXTERNAL SENSOR FOR TANK, SYSTEM OR PUMP DELAY

REMOTE SENSOR CONNECTOR IS	NOTE: COLOR OF WIRES AND
LOCATED ON SIDE OF UNIT.	LEAD STYLES MAY VARY
	WITH SENSOR PROVIDED.
	CONNECTIONS ARE POLARITY
	INSENSITIVE.
SIDE PANEL

FIG. 50 External Sensor for Tank, System, or Pump Delay

HEAT EXCHANGER

This is a highly sophisticated heat exchanger, designed to carry water in such a way that it generates a scouring action which keeps all interior surfaces free from build-up of impurities. The straight-line, two pass design of the tubes sends water into the headers at a properly rated velocity. The configuration of the headers, in turn, creates a high degree of turbulence which is sufficient to keep all contaminants in suspension. This “scouring action” provides greater cost savings for owners. Tubes are always able to transfer heat at peak efficiency. Every surface within this water containing section is of a nonferrous material, providing clear, clean, rust-free hot water. Straight copper tubes-finned on the outside for maximum heat transfer-glass lined cast iron one piece cored headers make up an entirely rustproof unit. On all models, header inspection plugs can be removed for field inspection and cleaning of copper tubes. The entire heat exchanger may be easily removed from the unit.

REMOTE SENSOR

INSTALLATION INSTRUCTIONS

Water heaters are provided with an extra temperature sensor that MUST BE field installed. The sensor is shipped loose in the I & O packet. This remote mounted sensor will be the primary temperature sensor which will inform the appliance’s built-in thermostat control. For domestic water heating, the sensor MUST BE installed into a bulbwell on the storage tank. This is required to maintain the desired temperature in the tank and reduce cycling of the heater.

THERMOSTAT SETTINGS

1.The thermostat is adjusted to a low test setting when shipped from the factory.

2.Set the thermostat to a maximum water temperature of 125°F which will satisfy hot water demands and prevent risk of scald injury.

Households with small children or invalids may require 120°F or lower temperature setting to reduce risk of scald injury. Some states may require a lower temperature setting. Check with

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