A. O. Smith Water Products Company Service Handbook
Irving, Texas 2000©
Training Department
14
NOTES APPLY TO ALL SYSTEMS:
*ADD GATE VALVES TO INLET AND OUTLET OF EACH UNIT
FOR ISOLATION FLEXIBILITY. LOCATE AT THE SAME POINT
FROM TEE.
** ADD THERMAL EXPANSION TANK TO COLD WATER
SUPPLY IF NECESSARY.
CONDENSATION HOSE MUST BE ALLOWED TO DRAIN.
NOTE: T&P VALVES MUST BE PIPED TO OPEN DRAIN OR
PER LOCAL CODE.
MULTIPLE UNIT - WATER PIPING
REVERSE RETURN PIPING
WITH TANK
2"
HOT TO FIXTURES
VENT TO
OUTDOORS
2"
T&P
EXHAUST
RETURN
CHECK
VALVE
T&P VALVE
2"
COLD
SUPPLY
TANK
THERMOMETER
CIRCULATOR THERMOSTAT
SET 5° COOLER THAN
HEATER SETTINGS
HOT
2"
COLD
RETURN
COLD
RETURN
1 1/2"
1 1/2"
1 1/2"
PIPE TO OPEN
DRAIN
1 1/2"
2"
1 1/2"
REVERSE RETURN PIPING
PARALLEL PIPING WITH TANK
PUMP
CHECK
VALVE
PUMP
PARALLEL PIPING
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