ELECTRIC WALL HUNG BOILERS

The Argo AT series boilers is a compact design packed with features. It is 100% efficient and is ideal for both low temperature radiant systems and standard hydronic heating (operating temperatures 90-180°F). The boiler utilizes a 4 element configuration which allows staged elements to be ener- gized based on demand. The microprocessor control individually energizes elements thru demand sensing, with the start up element rotated to balance run time across all elements. The Argo AT series boilers feature diagnostic indicator lights, circulator relay, redundant relays per element, and audible/ visual alarms/fault codes. Available in sizes from 12 KW thru 24 KW with a cast iron heat exchanger. Boiler shipped with circulator control, mounted breakers, limit controls, T & P gauge, and relief valve, less circulator.

CAT. NO. MFG. NO. BTU KW DIMENSIONS H x W x D SUPPLY & RETURN CONNECTIONS 1-1/4” 1-1/4” 1-1/4” 1-1/4”

5W712 5W716 5W720 5W724

AT124310B 40,944 12 AT164410B 54,592 16 AT204510B 68,240 20 AT244610B 81,888 24

14-5/8 x 18-5/8 x 9-1/8” 14-5/8 x 18-5/8 x 9-1/8” 14-5/8 x 18-5/8 x 9-1/8” 14-5/8 x 18-5/8 x 9-1/8”

ELEM NO. - SIZE

ON HEAT EXCHANGER RESIDENTIAL APPLICATIONS

ON PARTS

RESIDENTIAL APPLICATIONS

ELEM AMPS

4 - 3 KW 50.4 4 - 4 KW 66.7 4 - 5 KW 83.3

RECOMMENDED BREAKER 70.0 90.0

100.0 4 - 6 KW 100.0 125.0

RECOMMENDED WIRE 4 3 2 1

WEIGHT EACH

70 lbs 70 lbs 70 lbs 70 lbs

$2,427.21 $2,484.99 $2,537.62 $2,693.16

CIRCULATORS ON THE BOILER RETURN PIPING?

Is the return the best place to mount the circulator? No !! Actually the circulator would be better mounted on the supply side of the boiler, down stream from the air separator and the expansion tank. This position affords us advantages over mounting the circulator on the return.

First we need to understand that circulators don’t pump! They simply create a pressure differential in a closed system which causes the water to react. The small circulators we see on todays residential boilers will typically create approximately 4 to 6 psig of pressure differential. If we mount the circulator on the return, the 4 to 6 psig differential must be subtracted from the system fill pressure.

IE: System pressure is 12 lbs - 4 lbs ( pump differential). We see that we are left with an 8 lb differential to move the system water. If we mount the circulator on the supply side, down stream of the air separator and expansion tanks, the circulator pres- sure differential is added to the system pressure.

IE: System pressure is 12 lbs + 4 lbs (pump differential) and we now have a 16 psig differentrial to move the system water. The higher pressure differential affords us a higher flow and allows us to address some of those “hard to heat areas”. It also af- fords us better air elimination due to the higher flow thru the air eliminator.

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BOILERS