Rheem Indirect Water Heater - Manual (Page 9)

BOILER
SYSTEM
SUPPLY
CIRCULATOR
PUMP
BOILER
SYSTEM
RETURN
BOILER
COLD
1"
INLET
WATER HEATER
INDIRECT
HOT OUT
DOMESTIC
1 1/2"
BOILER
FROM
TO
BOILER CHECK
VALVE
BOILER
SUPPLY
SYSTEM
DOMESTIC
3/4"
HOT OUT
INDIRECT
WATER HEATER
BOILER
TO
BOILER
FROM
COLD
INLET
3/4"
VALVE
CHECK
PUMP
CIRCULATOR
RETURN
SYSTEM
BOILER
BOILER
1" NPT
1" NPT
1" NPT
1" NPT
BOILER
SYSTEM
SUPPLY
CIRCULATOR
PUMP
BOILER
SYSTEM
RETURN
BOILER
COLD
1"
INLET
WATER HEATER
INDIRECT
HOT OUT
DOMESTIC
1 1/2"
BOILER
FROM
TO
BOILER CHECK
VALVE
BOILER
SUPPLY
SYSTEM
DOMESTIC
3/4"
HOT OUT
INDIRECT
WATER HEATER
BOILER
TO
BOILER
FROM
COLD
INLET
3/4"
VALVE
CHECK
PUMP
CIRCULATOR
RETURN
SYSTEM
BOILER
BOILER
1" NPT
1" NPT
1" NPT
1" NPT
Page 9
Figure 7: STID80, STID120 water connections
SECTION IV: INSTALLATION
WaTer ConneCTIons
All piping between the boiler and the indirect water heater should be new copper with a
minimum size of 3/4” ID for models STID30, STID40, and STID50. Use 1” minimum copper for
models STID80 and STID120. Elbows should be minimized. A flow check valve must be
installed on the return line.
All piping to the inlet (cold) and outlet (hot) domestic water connections should be new copper
with a minimum size of 1/2” ID for models STID30, STID40, and STID50. Use 3/4” ID minimum for
models STID80 and STID120.
All piping should conform to local codes and ordinances. At a minimum, refer to ILHR 84 code if
local codes are not in place. It is recommended that all piping be adequately insulated with
approved material to ensure minimum heat loss. If a re-circulation line is used for domestic
water, be certain that all lines are well insulated and the circulator is temperature controlled.
Install isolation valves to permit proper servicing. It is also recommended to install a union on
the domestic outlet to facilitate replacement of the hot outlet / anode nipple on models STID30,
STID40, and STID50.
See Figures 6 and 7 for proper water connection installation.
NOTICE: Indirect water heater may be connected to a steam
boiler provided that all piping to and from
the boiler are below the water line of the boiler.
Boiler must also be protected by a low water
cut off safety device.
Figure 6: STID30, STID40, STID50 water connections