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1. The thermostat controls the maximum water temperature in the tank. The differential is a fixed 5°F with
a 170°F maximum setting. See Approximate Time/Temperature Relationship guide to determine the
safest water temperature for your applications.
2. For the most energy efficient operation, adjust the thermostat for the minimum water temperature
necessary to meet domestic hot water needs. IT IS NOT NECESSARY TO REMOVE THE COVER TO
ADJUST THE TEMPERATURE SETTING. THE THERMOSTAT COVER SHOULD NEVER BE
REMOVED WITHOUT ELECTRICITY BEING FIRST DISCONNECTED.
3. After the water heater completes a heat-up cycle, check the water temperatu re at a faucet. Allow
enough water to flow to ensure that the water temperature reflects the tank temperature. Adjust the wate r
heater’s temperature setting as necessa ry.
a. Adjusting to a lower temperature setting will not immediately affect water temperature. Draw suffici ent
water or allow the water heater to sit until a heat-up cycle is initiated. Repe at step 3.
b. Adjusting to a higher temperature may not immediately affect water temperature. If a heat up cycle
begins, return to step 3. If a heat-up cycle does not begin, draw sufficient water or allow the water heater
to sit until a heat-up cycle is initiated. Repeat step 3.

APPROXIMATE TIME/TEMPERATURE RELATIONSHIPS IN SCALDS

120°F More than 5 minutes
125°F 1 ½ to 2 minutes
130°F About 30 seconds
135°F About 10 seconds
140°F Less than 5 seconds
145°F Less than 3 seconds
150°F About 1 ½ seconds
155°F About 1 second

CAUTION

Before manually operating the valve, make sure that a drain line has been attached to the valve to
direct the discharge to an open drain. Failure to take this precaution could mean contact with
extremely hot water discharging from the valve during this checking operation.

OPERATING INSTRUCTIONS

BOILER SYSTEM START-UP

Follow boiler installation instructions to place boiler in operation.

SEQUENCE OF OPERATIONS

1. Thermostat senses stored water temperature below desired setting.
a. Normally open contacts close to interrupt space heating.
2. Thermostat senses stored water temperature at desired setting.
a. Normally open contacts open, returning boiler control to space heating.