Operating instructions

PROCEDURE 3—BOILERS WITH TANKLESS HEATER COIL
Boilers may be factory packaged with a tankless heater coil.
The use of this coil eliminates the need for a hot water storage tank. Instantaneous heating of water in coil provides a flow of hot water for domestic
use if proper burner and water supply line controls are used. Tankless coils are meant to provide domestic hot water for intermittent draws, not
continuous flows.
IMPORTANT: Do not use a tankless coil if water is excessively hard with lime or other deposits which will accumulate inside coil.
A. MOUNTING AQUASTAT CONTROL
The control configuration on this boiler has been set up so that the Honeywell L8124C Combination Hi/Low Limit Aquastat Relay mounts on the
tankless coil. This maximizes tankless coil performance by making burner respond more quickly to a call for domestic hot water.
The boiler is completely wired according to schematic wiring diagram. (See Fig. 14, 15, and 16.) The installer must mount the L8124C Aquastat
on control well in 3/4-in. tapping on tankless coil. (See Fig. 7.)
Fig. 5—Air Openings for Closet of Utility Room Installations
A95594
VENTILATING
GRILLE
COMBUSTION
AIR GRILLE
Fig. 6—Fresh Air Duct for Tightly Sealed House
A95595
BOILER
FRESH AIR
DUCT
Table 1–Fresh Air Duct Capacities for Ducts Supplying Fresh Air to Boiler in Tightly Constructed Houses (Btuh)*
FRESH AIR DUCT SIZE (IN.) 1/4–IN. MESH SCREEN WOOD LOUVERS METAL LOUVERS
3-1/2 X 12 144,000 36,000 108,000
8X8 256,000 64,000 192,000
8X12 384,000 96,000 288,000
8X16 512,000 128,000 384,000
*Based on opening covered by 1/4-in. mesh screen, wood louvers, or metal louvers.
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