Burnham 40A - Manual (Page 16)

16
V. Operation
A. 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.
B. 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.
C. 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.
WARNING
Never operate water heater with temperatures in excess of 200°F. Severely reduced water heater
life will result.