Lochinvar Power-Fin Designer's Manual page 35

Designer's Guide / Power-fin Water Heater
HIGH ALTITUDE APPLICATIONS
Atmospheric pressure decreases as the height above sea level increases. At any altitude above
sea level, a cubic foot contains less gas than a cubic foot at sea level. Thus, the heating value of
a cubic foot of fuel gas will decrease as height above sea level increases. Therefore a
recalculation of heat input rate should be performed on any appliance beginning at 2000 feet.
Ratings should be reduced at the rate of 4 percent for each 1000 feet above sea level.
The Power-fin water heater must be factory trimmed for installation at an altitude range
GREATER than 4000 feet above sea level.
FACTORY INSTALLED OPTIONAL EQUIPMENT
Lochinvar provides the following selection of optional equipment to meet your building
requirements.
Alarm Bell
Factory installed onto the inner front panel of the appliance and wired to the Alarm on Any Failure
contacts. It will sound on any failure. A silencing switch is provided. Alarm on Any Failure
contacts are standard on every Power-fin water heater for connection to a remote alarm bell or
Building Management System.
High & Low Gas Pressure Switches with Manual Reset
The switches are mounted just inside the upper front chamber. The High Gas Switch will
interrupt the call for heat should high gas pressure be sensed in the gas line. The Low Gas
Switch will interrupt the call for heat if the gas pressure supplied to the appliance is too low to
achieve a safe burner flame. Both switches require manual reset to restart the appliance.
The High and Low Gas Pressure Switches with Manual Reset is part of the Factory Mutual, GE
Gap or CSD1 option packages. Per CSD-1's exemption of the water heater, the Gas Pressure
switched may be ordered by name individually and not as part of CSD-1 code package.
Low Water Cut-Off, Probe Type with Manual Reset
The electronic board is mounted in the control panel with a sensing probe mounted in the top
header of the heat exchanger. The LWCO is set to interrupt the call for heat if a low water
condition is sensed. The LWCO requires manual reset to restart the appliance. This is offered
for many local codes that do not accept the standard-equipped flow switch as a low water cut off
device. Check with local code authorities for acceptance of the standard flow switch as a low
water cut off device.
Cupro-Nickel Heat Exchanger
90% copper, 10% nickel, the Copper-Nickel Heat Exchanger is a harder alloy than the standard
copper-tubed heat exchanger and is suggested for chemically treated water and for hard water
conditions.
Relief Valve
The standard relief valve offered on the Power-fin water heater is a 150 psi temperature &
Pressure ASME relief valve. The Power-fin can be factory trimmed with a temperature &
pressure relief valves with a different pressure rating of your choosing.
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LOCHINVAR CORPORATION
300 MADDOX SIMPSON PKWY
LEBANON, TN 37090
www.lochinvar.com