Bristol H23A283ABK Manuel d'installation et d'entretien - Page 7
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11.
VERIFY SYSTEM WILL NOT ALLOW LIQUID FLOODBACK.
HEAT PUMP
STEP 1: Operate system in the heating mode with outdoor fan disconnected.
STEP 2: Run system until the designed winter condition in your area is reached (may need to cover coil for
this test).
STEP 3: Check suction superheat 6" from compressor inlet.
STEP 4: Superheat should not drop below 5°F (3°K) (prefer no lower than 10°F [6°K]).
STEP 5: Sump temperature should always be 50°F (28°C) or higher above saturated suction temperature.
COOLING MODE (HEAT PUMP)
STEP 1: Operate system in cooling mode with indoor fan disconnected and repeat steps 3, 4 and 5.
AIR-CONDITIONING/REFRIGERATION UNITS
STEP 1: Operate system in the cooling mode with indoor fan disconnected and repeat steps 3, 4 and 5.
NOTE:
FOR THE "HARD TO GET
TO" COMPRESSOR
TAKE TEMPERATURES
AND PRESSURES HERE,
AIR CONDITIONING
MODE ONLY
12.
CHECK FILTER DRIERS FOR CONTAMINATION.
A.
Suction Line Filter: If internal contamination is heavy, the suction line filter drier may become
clogged and ineffective. Check the pressure drop across the filter drier after approximately 8 hours
running time and, if it exceeds 2 psig, replace.
EXAMPLE: "R-22"
38 psig =
+ 50°F (28°K)
HOW TO CHECK SUPERHEAT
16°F (-9°C)
= SATURATED SUCTION
= MINIMUM TEMP. DIFFERENCE
66°F (19°C)
= MINIMUM SUMP TEMPERATURE
58°F
(14°C)
DIGITAL
THERMOMETER
Page 7
TAKE SUCTION
TEMPERATURE
6" TO 12"
FROM COMPRESSOR
58° F (14°C)
-38° F (-3°C)
20° F (11°K)
CONVERT SUCTION
PRESSURE TO
TEMPERATURE
65 PSIG = 38°F (3°C)
SUPERHEAT