Lochinvar 402 - 2072 operation manual Thermostat adjustment procedure, Domestic water temperatures

8 Domestic water heaters

Thermostat adjustment procedure

1.	Press the UP or DOWN key to view the set point
	setting.
2.	Press either the UP or DOWN key to increase or
	decrease the displayed set point value.

Installation & Operation Manual

(continued)

Inlet water temperatures below the specified minimum recommendations can excessively cool the products of combustion resulting in condensation on the heat exchanger. Condensation on the heat exchanger can cause operational problems, bad combustion, sooting, flue gas spillage and reduced service life of the related components.

3. Press the ENTER key to permanently store the new

set point into the control module’s memory.

Failure to press the ENTER key after changing the display value will result in the set point reverting back to its previous value after the current heat demand ends.

The control may be adjusted any time regardless of call for heat status. When pressing the UP or DOWN key to enter any new set points, the control module will immediately begin controlling based on the new set point.

￿CAUTION

An appliance allowed to operate at return temperatures below the specified minimum setting may experience problems with the operating controls, safety switches, obstruction of the flue gas passages on the heat exchanger, incomplete combustion, and possible flue gas spillage. Sustained operation at lower than specified water temperatures may cause hazardous conditions that may result in personal injury or non-warrantable damage to the appliance.

Minimum water temperatures (domestic hot water use)

Domestic water temperatures:

This high efficiency water heater should be operated at a temperature setting high enough to prevent condensing of the products of combustion on the unit’s heat exchanger or in the attached venting system. Use extreme caution when storing water at elevated temperatures. A water temperature setting maintained above the dew point of the products of gas combustion should prevent condensate formation and ensure proper performance of the venting system. The manufacturer recommends the use of a properly sized

The maximum temperature set point that can be programmed into the control module from the Operator Interface for water heater operation is 190°F (88°C). The control is factory pre-set at approximately 120°F (49°C). Facilities with small children or invalids may require 120°F (49°C) or a lower temperature setting to reduce risk of scald injury. Some states may require a lower temperature setting. Check with your gas supplier for local requirements governing the temperature setting. Remember, no water heating system will provide exact temperature at all times. Allow a few days of operation at this setting to determine the correct temperature setting consistent with your needs.

thermostatic mixing valve to supply domestic hot water at temperatures less than 140°F (60°C). Storing the water at a higher temperature and thermostatically mixing the water will increase the available quantity of mixed hot water, greatly reducing the possibility of condensate formation on the heat exchanger or in the venting system and help prevent the growth of water borne bacteria.

NOTICE	Adequate care MUST be taken to
	prevent a potential scald injury when
	storing water at elevated temperatures
	for domestic use.

NOTICE

￿CAUTION

1.This water heater, when set at the lower temperature setting, is not capable of producing hot water of sufficient temperature for sanitizing purposes.

2.Higher stored water temperature increases the ability of the water heater to supply desired quantities of hot water, however remember --

Hotter water increases the risk of scald injury.

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