Operating instructions

5
INSTALLATION
1) THE PHCO PREHEATER SHOULD BE INSTALLED ON ANY LEVEL
STABLE FOUNDATION. THE HEATER IS PLUMBED BETWEEN THE
DISCHARGE OF THE PUMP AND THE BURNER. THE BY PASS LINE
FROM THE BURNER RELIEF VALVE MUST RETURN TO THE PUMP
SUCTION AND NOT THE HOLDING TANK. THIS IS TO AVOID ADDING
HEAT TO THE STORAGE TANK AND TO REDUCE THE ELECTRICAL
LOAD BY RETURNING HEATED OIL TO THE SYSTEM.
2) THE INLET IS ON THE BOTTOM OF THE UNIT. THE DISCHARGE IS AT
THE TOP OF THE UNIT. CAUTION: THESE FITTINGS MUST BE USED
ONLY AS THE INLET AND DISCHARGE IN ORDER TO MAINTAIN
CORRECT TEMPERATURE CONTROL AND OPERATE SAFELY.
3) FITTINGS ARE ALL STANDARD PIPE THREAD. PROPER FIT AND A
GOOD QUALITY THREAD SEALANT ARE RECOMMENDED. UNIONS MAY
BE USED AT CONNECTION POINTS TO ALLOW THE UNIT TO BE MOVED
FOR CLEANING.
4) ELECTRICALLY, PHCO PREHEATERS REQUIRE THAT MAIN
SERVICE NEED BE SUPPLIED TO THE LINE SIDE LUGS ON THE
MAIN DISCONNECT SWITCH. PROPERLY SIZED CONDUIT
ENCLOSED CONDUCTORS SHOULD BE USED. SEE LABLE
INSIDE CONTROL PANEL FOR VOLTAGE, PHASE AND CURRENT
RATINGS.
5) THERMOCOUPLES FOR BOTH THE HIGH LIMIT AND MAIN
TEMPERATURE CONTROL ARE INSTALLED IN THE UNIT. THE
MAIN CONTROL SENSOR IS INSERTED IN THE DISCHARGE TEE,
THE HIGH LIMIT SENSOR IS INSTALLED IN THE PIPE BODY OT
THE TOP HEATER UNIT (IN MULTIPLE HEATER ASSEMBLIES).
CONNECT BOTH SENSORS TO THE TERMINAL BLOCK IN THE
CONTROL PANEL USING THE INCLUDED EXTENSION WIRE.
PLEASE NOTE AND MAINTAIN THERMOCOUPLE POLARITY.
6) THERE IS AN OIL FLOW SWITCH LOCATED IN THE HEATER DISCHARGE
PIPING. THIS SWITCH WILL NOT ALLOW THE HEATER TO ENERGIZE
UNLESS THERE IS SUFFICIENT OIL FLOW. THE FLOW SWITCH MUST
BE CONNECTED TO THE TERMINAL BLOCK IN THE CONTROL PANEL.