lp-770 Rev. 000 Rel. 000 Date 6.21.21
15
Figure 11 - Using L8148A or L8152A Cold Start Boiler Control with Zone Valves
3. After ensuring there are no leaks within the system, flush the system to clear any soldering residue. Draw
at least three times the volume of the water heater to properly flush the system.
4. Initiate a call for hot water. Ensure each zone valve or circulator operates only when its thermostat calls
for heat. Purge each zone of air to ensure proper operation.
5. Set the water heater aquastat to the desired temperature by rotating the screwdriver slot to align with the
desired setting. Boiler high limit should be set at least 20
o
F higher than the heater temperature. Set the low
limit of the boiler control at the minimum setting - this will call the burner on only to satisfy the tank control.
A water heater temperature setting of 120
o
F is recommended. However, a lower temperature setting may
be required to comply with local and state codes for normal operation. The differential is fixed 3 to 5
o
F.
Installation conditions may require a higher or lower temperature setting. In accordance with local and
national plumbing codes it is highly recommended that a thermostatic mixing valve be used to protect the user from potential hazard due to
spikes in temperature. A mixing valve in conjunction with a high temperature setting may be used for high demand applications (spas, hot
tubs, whirlpools). It is important to check the output temperature of any water heater with a thermometer to insure that the setting is correct.
6. When the system is completely flushed, purged of air, and the temperature is set, turn on the boiler. Observe operation. Ensure the boiler
shuts down after the indirect water heater set point is satisfied.
1. Fill the water heater by opening the cold water shut-off valve. Purge air from the system by opening a hot water outlet at a fixture in a
kitchen or bathroom. When water flows freely from the outlet, the system is purged.
Part 5 - Start-Up and Operation
When filling the water heater, open a hot water tap to release air in the tank and piping to ensure proper
water heater operation. Failure to ensure the water heater is full before turning on the system will result
in damage to the water heater, and could result in property damage. Such damages ARE NOT covered by
warranty.
2. Check the system for leaks.
Fix any leaks before continuing the installation. Failure to do so could result in property damage or
personal injury.
CAUTION
CAUTION
!
WARNING
!
Risk of scald injury increases as you increase water temperature.