Burnham 40A User Manual

System Start-Up

1. Follow boiler installation instructions to place

boiler in operation.

2. Turn aquastat dial clockwise to desired setting.

a. An initial setting of  120°F is recommended.

b. Turning the knob clockwise from "100" position

will cause an audible click indicating the desired
temperature is higher than the current tank
water temperature.

Sequence of Operation

1. Aquastat senses stored water temperature drops

below desired setting.

a. Aquastat contacts close to start domestic hot

water circulator and energize relay.

b. Normally open contacts close to initiate boiler

ignition sequence.

c. Domestic hot water priority only:  normally

closed contacts open to interrupt space heating.

2. Aquastat satisfied

a. Aquastat contacts open, turning off domestic hot

water circulator and de-energizing relay.

b. Normally open contacts open, stopping boiler

operation.

c. Domestic hot water priority only:  normally

closed contacts close, returning boiler control to
space heating.

Water Temperature Adjustment

1. The aquastat controls the maximum water

temperature in the tank.  It's differential is fixed at
5°F.  It's maximum setting is 160°F.

2. For the most energy efficient operation, adjust

aquastat for the minimum water temperature
necessary to meet domestic hot water needs.

3. After the water heater completes a heat-up cycle,

check the water temperature at a faucet. Adjust
water heater's temperature setting as necessary.

a. Adjusting to a lower temperature setting will not

immediately affect water temperature. Draw
sufficient water or allow the water heater to sit
until a heat-up cycle is initiated. Repeat step 3.

b. Adjusting to a higher temperature may not

immediately affect water temperature. If a heat-
up cycle begins, go 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.

D.

To Shut-off Water Heater

1. Turn power off to the Alliance.

2. Follow boiler operating instructions to turn off

boiler.