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C. Unit Start-Up (cont)
COOLER LOOP PROTECTION IF REQUIRED:
GALLONS (LITERS) OF BRINE ADDED:
PIPING INCLUDES ELECTRIC TAPE HEATERS.
CHECK PRESSURE DROP ACROSS COOLER.
FLUID ENTERING COOLER:
PSIG (kPa)
FLUID LEAVING COOLER:
PSIG (kPa)
(PSIG DIFFERENCE) x 2.31 = FT OF FLUID PRESSURE DROP =
(kPa DIFFERENCE) x .335 = FT OF FLUID PRESSURE DROP =
PLOT COOLER PRESSURE DROP ON PERFORMANCE DATA CHART (LOCATED IN PRODUCT DATA LITERATURE) TO
DETERMINE TOTAL GPM (L/s).
TOTAL GPM (L/s) =
UNIT’S RATED MIN. GPM (L/s) =
GPM (L/s) PER TON = UNIT’S RATED MIN. PRESSURE DROP =
(Refer to product data literature.)
JOB’S SPECIFIED GPM (L/s) (if available)
NOTE: IF UNIT HAS LOW FLUID FLOW, FIND SOURCE OF PROBLEM: CHECK FLUID PIPING, IN-LINE FLUID STRAINER,
SHUT-OFF VALVES, CHILLED FLUID PUMP ROTATION, ETC.
COOLER LOOP PROTECTION:
GAL. (L) OF BRINE ADDED (IF REQUIRED).
IN-LINE WATER STRAINER INSTALLED ADJACENT TO COOLER FLUID INLET. (REQUIRED FOR 30HW COOLERS.)
YES NO
CONDENSER PROTECTION:
IN-LINE MINIMUM 20-MESH STRAINER INSTALLED ADJACENT TO THE CONDENSER WATER INLET.
YES
NO
TO START THE CHILLER: (insert check mark as each item is completed)
PLACE ON-OFF SWITCH IN THE ON POSITION.
ASSUMING THERE IS A CALL FOR CHILLED FLUID, THE COMPRESSOR WILL START UNLOADED AFTERA 6-SECOND
TO 5-MINUTE DELAY (DEPENDING ON THE TIMING LOGIC).
THE LOW-PRESSURE SWITCH (ALLUNITS)AND OIL-PRESSURE SWITCH (30HL, HWAUNITS —ACCESSORY ON 30HK,
HWB, HWC, HWS UNITS) ARE BYPASSED FOR 2 MINUTES.
IF ADDITIONAL CAPACITY IS REQUIRED AFTER THE 2-MINUTE PERIOD, COMPRESSOR WILL LOAD UP.
MEASURE THE FOLLOWING: WHILE MACHINE IS IN STABLE OPERATING CONDITION.
SUCTION PRESSURE
SUCTION LINE TEMP.
SUCTION SUPERHEAT
DISCHARGE PRESSURE
DISCHARGE LINE TEMP.
DISCHARGE SUPERHEAT
CHECK AND ADJUST SUCTION SUPERHEAT (9 to 11 F [5 to 6 C]).
CL-3