AERCO Coil & Riser Replacement - Manual (Page 13)

PR2: 04/01/11 Page 13 of 16 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
Coil/Riser Replace Instructions for Helitherm Water Heaters
Technical instructions TID-0038_0A
HE-109
7.2 B+ II Wizard Sub-cooling Coil Installation
7.3 Steam Coil Installation
NOTE
The procedure in paragraph 7.2 are not required for Regular A, B, C or D Type Heaters.
B+ II Wizard Sub-cooling Coil Installation
1) For Wizard Sub-cooling Coil, align the Union Nuts with the two Spuds on the Condensate Riser.
2) Hand thread the Unions Nuts down to the seating surface.
3) Position the Coil to a level position.
4) Using the 75 ft/lb torque wrench, tighten the Union Nuts.
5) If the Union Nuts do not seat properly, remove the Sub-cooling Coil and re-clean all surfaces and
threads on the Riser Spuds.
Section 7.2 Instructions
END
Steam Coil Installation
1) While holding the Steam Coil horizontally with the Union Nuts facing the Riser Spuds, hand thread the
Steam Union Nuts onto the Spud. (Figure 7).
2) Hand thread the Condensate Union Nut onto the Spud.
3) Position the Coil horizontally.
4) Using a Carpenter’s Square, check the vertical alignment to ensure that the Coil is installed inside the
perimeter of the Shell. It is important that all coils in the bundle line up vertically and are positioned to
ensure that they will not rub against the Liner of the Heater Shell.
5) If needed, use the appropriate Short-Length wrench to tighten the Union Nuts to a seating condition.
6) Insert the Coil Retaining tool through the first lower section of the Coil tubing. (Figure 8).
7) Using a Torque Wrench set for 75 ft-lbs, insert the wrench in the proper torque direction on the Union
Nut (Figure 8).
8) Apply pressure to the Coil Retaining tool in the opposite direction of the pressure being applied to the
Torque Wrench and tighten the Union Nut.
9) When the Torque Wrench setting “clicks”, remove the Coil Retaining Tool.
10) Slowly reapply the pressure to the Torque Wrench holding the Coil by hand until the setting “clicks”. If
the Coil rotates during this operation, reinsert the Coil Retaining Tool and carefully apply a little more
torque.
11) Once again, reapply the pressure to the Torque Wrench without holding the Coil until the setting
“clicks”.
12) Repeat step 11 until the Torque Wrench setting “clicks” without rotating the Union Nut or twisting the
Coil.
13) Using the Coil Spacing Tool, perform a final spacing check of the Coil tubing by creating uniformed
gaps between the Coil tubes (see Figure 4). Check for spacing between the Box Header and Return
Bend. If the Return Bend is touching the Box Header, use the Coil Spacing Tool to separate the two
components. Check for spacing between the Coil tubes above and below the Box Header. Create
clearance using the Coil Spacing Tool.
14) Recheck all Union Nuts for the 75 ft/lbs setting without holding the Coil.
15) If a Union Nut or Coil rotates during this step, repeat steps 10 and 11.
Section 7.3 Instructions
END