Emerson COPELAND ZH04K1P, Инструкции по применению

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AGL_HP_ST_ZHK1P_EN_Rev00 11
3.5 Crankcase heaters
CAUTION
Overheating and burnout! Compressor damage!
Never ap ply power t o
the crankcase heater in free air, before the crankcase heater is installed on
the compressor or when it is not in complete contact wit h t he c ompressor
shell.
IMPORTANT
Oil dilution! Bearing malfunction!
Turn the crankcase heater on 12 hours
bef ore starting the compressor.
A crankcase heater is used to prevent refrigerant from migrating into t he s hell d uring st andstill
periods. The installation of a
crankcase heater is required when the system c harg e ex ceeds the
compressor charge limits indicate d in Table 3 . This requirement is independent from syst em t ype
and configuration.
Compressor model
Refrigerant charge limit
Single compressor systems
Refrigerant charge limit
Even Tandem systems
ZH04K1P & ZH05K1P 3.6 kg 5.0 kg
ZH06K1P to ZH12K1P
ZHI05K1P to ZHI14K1P
4.5 kg 6.3 kg
ZH15K1P & ZH19K1P
ZHI18K1P & ZHI23K1P
4.5 kg 6.3 kg
ZHI27K1P to ZHI46K1P 7 kg 10.9 kg
Table 3 : Refrigerant charge limit
For compressor models ZH04K1P to ZH19K1P and
ZHI05K1P to ZHI23K1P, the crankcase heat er must
be mounted 10 to 40 mm above compressor legs
–
see Figure 6 .
Figure 6: Crankcase heater location, models ZH04K1P to ZH19K1P and ZHI05K1P to ZHI23K1P
For compressor models ZHI27K1P to ZHI46K1P, t he
crankcase heater must be mounted below the oil
removal valve located on the bottom shell for tandem
versions
– see
Figure 7 .
Figure 7: Crankcase heater location, models ZHI27K1P to ZHI4 6K1P
The initial start-up in the field is a very critical period for any compressor because all load -bearing
surf aces are new and require a short break-in period to carry high loads under adverse conditions.
The crankcase heater must be turned on a minimum of 12 hours prior to starting the
compressor.
This will prevent oil dilution and bearing stress on initial s tart -up. The crankcase
heater must remain energized during compressor off cycles.
NOTE: Pl ease refer to the Spare Parts list available at www.climate.emerson.com/en-
gb/tools-resources to select the correct crankcase heater model.
Caution: Crankcase heaters must be properly grounded!
For installation, the manufacturer/installer shall follow the recommendations mentioned below.
Assembly instructions
▪
Choose the appropriate model according to compressor size and required wattage.
▪
Check the compressor application guidelines for crankcase heater connection and operation.
▪
Position the crankcase heater between the lower cover and the lower bearing weld project ion
(Fig. 8) .