Section Iv: Installation; Water Connections - Rheem STID30 Instruction Manual

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.
3/4"
3/4"
COLD
DOMESTIC
INLET
HOT OUT
INDIRECT
WATER HEATER
FROM
BOILER
1" NPT
TO
BOILER
1" NPT
Figure 6: STID30, STID40, STID50 water connections
NOTICE: Indirect water heater may be connected to a steam
1 1/2"
boiler provided that all piping to and from
DOMESTIC
HOT OUT
the boiler are below the water line of the boiler.
Boiler must also be protected by a low water
INDIRECT
WATER HEATER
cut off safety device.
FROM
BOILER
1" NPT
1 1/2"
COLD
INLET
TO
BOILER
1" NPT
BOILER
SYSTEM
SUPPLY
CIRCULATOR
PUMP
BOILER
BOILER
SYSTEM
RETURN
CHECK
VALVE
BOILER
SYSTEM
SUPPLY
CIRCULATOR
PUMP
BOILER
BOILER
SYSTEM
RETURN
CHECK
VALVE
3/4" 3/4"
COLD
DOMESTIC
INLET
HOT OUT
INDIRECT
WATER HEATER
FROM
BOILER
1" NPT
TO
BOILER
1" NPT
1 1/2"
DOMESTIC
HOT OUT
INDIRECT
WATER HEATER
FROM
BOILER
1" NPT
1 1/2"
COLD
INLET
TO
BOILER
1" NPT
Figure 7: STID80, STID120 water connections
BOILER
SYSTEM
SUPPLY
CIRCULATOR
PUMP
BOILER
BOILER
SYSTEM
RETURN
CHECK
VALVE
BOILER
SYSTEM
SUPPLY
CIRCULATOR
PUMP
BOILER
BOILER
SYSTEM
RETURN
CHECK
VALVE
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