HydroTherm EW2-1203, Installation, Operation & Maintanance Manual

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STEP 2: INSTALLING & PURGING WATER PIPING
PROCEDURE B: Install supply and
return water piping. For Models
EW-85, 100 & 125, supply outlet is
on top-front of boiler and vent
fitting assembly tapping is at top-
rear of boiler, Figure 1.4.
If boiler is installed above level of
radiation, a low water cut-off must
be used.
NOTE: ALL EXTERNAL PIPING
MUST BE SUPPORTED BY HANG-
ERS, NOT BY BOILER OR ACCES-
SORIES.
CAUTION: To prevent damage due
to excessive condensation, one of
the following piping options should
be used, see next page.
FIGURE 1.4
CAUTION: Boiler must not be used without forced circulation, as overheating or failure of cast iron sections
may result.
PROCEDURE A: Install vent tapping assembly, components and relief valve discharge piping. For Models
EW-85, 100 & 125, supply outlet is on the top front of the boiler and vent fitting assembly
tapping is at top-rear of boiler.
Relief Valve Discharge Piping: Must terminate 6" above floor &
be same size or larger than valve outlet, Figure 1.3
.
PRESS. RELIEF
VALVE
RELIEF VALVE
DISCHARGE
PIPING
VENT
FITTING
ASS'Y.
AIR VENT
VERTICAL EXPANSION TANK
ARRANGEMENT (PREFERRED)
1/2" NPT TAPPING
MAY BE PIPED TO
EITHER SIDE OF BOILER
HORIZONTAL EXPANSION
TANK ARRANGEMENT
MAY BE SCREWED
INTO TAPPING
FIGURE 1.3
WARNING: No valve of any type may be installed between
the boiler and relief valve or an explosion from over-pres-
sure may occur.
➤
➤
CAUTION: Piping must be installed from relief valve dis-
charge so there will be no danger of scalding personnel.