Water Flow Velocity And Pump Selection - Lochinvar EFW 85 Installation, Commissioning, User And Maintenance Instructions

Water flow velocity and pump selection

For a given combination of water heaters and tanks, pump selection is very important with respect to the
required flow velocity. Use the water heater exchanger resistance graphs to calculate the pump needed
Water flow velocity and pipe diameters and lengths
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The arguments that hold for pump selection, hold for piping design as well: all piping components added up
are giving a certain total resistance which should not exceed a critical value at which the pump cannot realize
the required flow velocity anymore.
Following the instructions and recommendations given in the referred paragraphs will highly improve the func-
tioning and considerably lengthen the life time of your HW system.
Furthermore, for all Lochinvar Ltd appliances the next instructions and recommendations apply:
•
Never use aluminium or aluminium containing flue gas outlet parts.
•
Always fill the siphon before commissioning the water heater
•
Always set the gas valve during commissioning of the water heater, for the first time and af-
ter maintenance and/or installation changes
•
Never place a (ball) valve between the safety valve and the water heater
•
In a log, keep track of all situations regarding the appliance:
what, when, by whom, what actions and/or changes, what communication has been per-
formed
Lochinvar Ltd is not liable for any damage caused by inaccurately following these instructions. Only Lochinvar Ltd
parts may be used when carrying out any repair or service works.
Do not use chlorine based products for brazing. When commissioning the water heater, the running of the water
heater pump must be checked before leaving the installation.
Firing the water heater without water flow (but filled with water) will cause a boiling noise and can damage the
heat exchanger.
The Outlet and Inlet temperature are checked continuously. The temperature difference may not exceed the pro-
grammed value belonging to the actual power mode. If it does, the water heater will go in a lock-out.
The applied DHW pump must be controlled only by the EFW water heater control. If, for any reason an
external pump control is applied without written approval of Lochinvar Ltd, the complete warranty on the
EFW water heater and all supplied parts will become invalid.
Minimum water pressure 1.0 bar.
Fuel used should have sulphur rates that comply with the next values: a maximum annual peak over a short pe-
riod of time of 150 mg/m
Combustion air must be free of contents of chlorine, ammonia and alkali agents. The air near a swimming pool, a
washing machine or a laundry is containing these ammonia contents.
If the water heater is used in combination with a hot water tank without any other heat exchanger; the water
heater should be equipped with a safety relief valve. The tank must be equipped with a T&P relief valve. Always
apply all applicable installation standards and regulations.
At first installation, the built-in automatic air vent should be open.
3
and an annual average of 30 mg/m
3
maximum.
E93.1804.014
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