Technical Service Bulletin : Anode Rods – Solution with Electric Isolation
4. Isolate the blower motor with a blower motor isolation kit: (Part #: P-0125 on www.garnparts.com). Installation instructions for the isolation kit can be found on PAGE 8.
3
UNITS WITHOUT ELECTRIC HEATING ELEMENTS:
FULL ISOLATION (OPTION 1)
1
1.
Disconnect the independent ground rod:
5. Dielectrically isolate any pumps directly connected to the GARN unit: 4
A pump is dielectrically isolated if there is a means that breaks the metal-to-metal contact between the pump housing itself and the GARN unit. Examples of di-electric isolation include: dielectric unions, any length of PEX, or isolation valve flanges attached directly to the pump (such as Grundfos dielectric isolation valves).
2. 3.
Check to ensure that the unit is set on foam:
2
The following picture shows a pump that is dielectrically isolated from the GARN unit:
By installing dieletric unions (or equivalent) on or near the Hot Water Supply (HWS) and Hot Water Return (HWR) connections of the GARN unit, electric isolation is achieved for any and all components connected downstream.
Anode Rods – Part 3: Electric Isolation
Rev: 20151130 Page: 3 of 8
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