SEISCO
Endless Hot Water
RA/CA-WIRE AND BREAKER SIZING
Main panel requires 8 spaces or four (4) double-pole, 30 amp, 240 volt breaker positions. Breaker lugs must have a 75°C rating. A 200 AMP MAIN SERVICE IS RECOM- MENDED. Four pairs of #8 Cu AWG with ground are required between the RA-28 and the main panel.
Main panel requires 4 spaces or two (2) double-pole, 60 amp, 240 volt breaker positions. Breaker lugs must have 75°C rating to feed sub-feed, from main panel. A 200 AMP MAIN SERVICE IS RECOMMENDED. Four pairs of #8 Cu AWG with ground are required between RA-28 and subpanel. Two pairs of #6 Cu AWG with ground are required between the subpanels and the main panel. Main panel requires 2 spaces or one (1) double-pole, 125 amp, 240 volt breaker position. Breaker lugs must have 75°C rating to feed sub-feed, from main panel. A 200 AMP MAIN SERVICE IS RECOMMENDED. Four pairs of #8 Cu AWG with ground are required between RA-28 and subpanel. One pair of #1 Cu AWG with ground or one pair #2/0 AL with ground is required between the sub- panel and the main panel.
Under the 2005 Edition of the National Electric Code (NEC), article 422.11(f)(3), water heaters and steam boilers employing resistance-type im- mersion electric heating elements contained in an ASME-rated and stamped vessel or listed instantaneous water heaters shall be permitted to be subdivided into circuits not exceeding 120 amperes and protected at not more than 150 amperes.
As a result, U.L. has given authorization to Microtherm, Inc., under U.L. Standard 499, to use their U.L. marking on the SEISCO® model RA-28 for connections to two (2) 60 Amp branch circuits instead of the four (4) 30 Amp branch circuits, as was previously required.
The wiring guide below illustrates two new wiring options for the RA-28. In accordance with NEC 422.11(f)(3), two 60 Amp branch circuits are shown connected to the RA-28 directly from the Main Service Panel in the Option A diagram below. In Option B, two 60 Amp branch circuits are shown connected to the RA-28 directly from a sub-panel downstream from the Main Service Panel.
- - - CAUTION - - -
Before using this two circuit option for the RA-28 Model, check with the Manufacturer to make sure that either the jumpers have been installed on the control board at the factory or they have been ordered or shipped with the unit. There should be four jumpers, 4 inches in length, 2 red and 2 black.
Main panel requires 4 spaces or two (2) double-pole, 60 amp, 240 volt breaker positions. Breaker lugs must have 75°C rating from main panel. A 200 AMP MAIN SERVICE IS RECOMMENDED. Two pairs of #6 Cu AWG with ground are required between the RA-28 and the main panel.
Main panel requires 2 spaces or one (1) double-pole, 125 amp, 240 volt breaker position. Breaker lugs must have 75°C rating to feed sub-feed, from main panel. A 200 AMP MAIN SERVICE IS RECOMMENDED. Two pairs of #6 Cu AWG with ground are required between the RA-28 and the subpanel. One pair of #1 Cu AWG with ground or one pair of #2/0 AL with ground is required between the subpanel and the main panel.
Electrical Requirements
Electrical Requirements
-AIN 2! -AIN 2! -AIN 2! Option A Option B Option C -AIN 2! -AIN 2! Option A Option B Subpanel Subpanel SubpanelNote: For RA/CA-32 models, use the wiring diagrams on this page and substitute 40 for 30 Amp breakers, 75 for 60 Amp breakers, 150 for 125 Amp breakers, and #4 for #6 AWG. Where shown, #8 and #1 AWG and/or #2/O AL may be used without replacement.
SEISCO
Endless Hot Water
Under the 2005 Edition of the National Electric Code (NEC), article 422.11(f)(3), Water heaters and steam boilers employing resistance-type im- mersion electric heating elements contained in an ASME-rated and stamped vessel or listed instantaneous water heaters shall be permitted to be subdivided into circuits not exceeding 120 amperes and protected at not more than 150 amperes.
As a result, U.L. has given authorization to Microtherm, Inc., under U.L. Standard 499, to use their U.L. marking on the SEISCO® model RA-14 for connections to one (1) 60 Amp branch circuit instead of the two (2) 30 Amp branch circuits, as was previously required.
The wiring guide below illustrates the new wiring option for the RA-14. In accordance with NEC 422.11(f)(3), one 60 Amp branch circuit is shown connected to the RA-14 directly from the Main Service Panel in the diagram below.
- - - CAUTION - - -
Before using this one circuit option for the RA-14 Model, check with the Manufacturer to make sure that the jumpers have been installed on the con- trol board at the factory or they have been ordered or shipped with the unit. There should be two jumpers, 4 inches in length, 1 red and 1 black.
Main panel requires 4 spaces or two (2) double-pole, 50 amp, 240 volt breaker positions. Two pairs of #6 Cu AWG are required between the RA-22 and the main panel.
Main panel requires 2 spaces or one (1) double-pole, 100 amp, 240 volt breaker position. Two pairs of #6 Cu AWG with ground are required between the RA-22 and the sub- panel. One pair of #3 Cu AWG with ground or one pair of #1 AL with ground is required between the subpanel and the main panel.
Main panel requires 4 spaces or two (2) double-pole, 40 amp, 240 volt breaker positions. Two pairs of #8 Cu AWG are required between the RA-18 and the main panel. Main panel requires 2 spaces or one (1) double-pole, 75 amp, 240 volt breaker position. Two pairs of #8 Cu AWG with ground are required between the RA-18 and the sub- panel. One pair of #4 Cu AWG with ground or one pair of #2 AL with ground is required between the subpanel and the main panel.
Main panel requires 4 spaces or two (2) double-pole, 30 amp, 240 volt breaker positions. Two pairs of #8 Cu AWG are required between the RA-14 and the main panel. Main panel requires 2 spaces or one (1) double-pole, 60 amp, 240 volt breaker position. Two pairs of #8 Cu AWG with ground are required between the RA-14 and the sub- panel. One pair of #6 Cu AWG with ground or one pair of #4 AL with ground is required between the subpanel and the main panel.
Main panel requires 2 spaces or one (1) double-pole, 60 amp, 240 volt breaker positions. One pair of #6 Cu AWG with ground is required between the RA-14 and the main panel.
RA/CA-WIRE AND BREAKER SIZING