Crankcase Heaters; Fan Speed Controller; Fan Control Switch; Discharge Thermostat - J&E Hall V3 FUSION Technical Manual

Crankcase Heaters

•
Crankcase heater should remain energized during the
compressor off cycles. The initial start in the field is a
very critical period for any new compressor because
all load-bearing surfaces are new and require a short
break-in period to carry high loads under adverse
conditions. Thus, the crankcase heater must be turned
on a minimum of 12 hours before the first-time start, to
prevent oil dilution and bearing stress on initial start-
up.
•
To energize the crankcase heater while keeping
compressor OFF, isolate the compressor from circuit by
removing jumper wire which in series with H/L pressure
switch, such as terminal 3-4 in Series 2, and then turn
the motor rated circuit breaker to ON position.
Fan Speed Controller XGE-4C
(Applicable to Series 2/3/4 and 6)
•
The fan speed controller is factory set to 19barg
(maximum speed) and cut off when drop below
13barg, for operation with R4*** series refrigerant to
ensure compressor always operates within the unit
operating envelope.
•
When operate with R134a, the fan speed controller
setting need to be set to 13bar.
Figure 9: Full voltage adjustment on XGE-4C
1 Turn
Full voltage adjusting
range
Full voltage set point
(factory setting)
Effective proportional
band
•
The FSC is set according to Table 6 to gain higher
energy efficiency as published in the Ecodesign data
sheets.
Table 6: FSC settings to obtain ecodesign data
Model
S2 except (JEHS-0350-
B2-M; JEHR-0180/210-
B2-L)
JEHS-0350-B2-M; JEHR-
0180/210-B2-L; S3
S4 except EVI; S6
S4 EVI
Fan control switch SYS-C130
(Applicable to Series 1- Low Temperature Model)
•
The fan control switch is factory set as Table 7, which is
the same setting to obtain the Eco design data.
•
Fan stopped when the pressure drop below fan cut out
pressure.
Issue: 01.06.2023
~1.5bar
10~25barg
19barg full
speed,
mode: cut
off at Pmin.
6 barg
(fixed)
FSC settings (barg, maximum speed)
R407A, R407F, R448A,
R449A, R452A
19
10
10
17
Table 7: Fan control switch factory setting
Model
JEHR-0115/135-B1-L-1
Fan Cut Out = Cut In – Differentiate

Discharge Thermostat

(Applicable to JEHS-0750-B4-L-3, JEHS-1300-B4-M-3,
JEHS-1500-B6-M-3 and all EVI)
Only scroll models specified above are equipped with
discharge thermostat with specification (cut out = 125±4⁰C,
cut in = 95±5⁰C). The thermostat is connected in series to
dual pressure switches, to disconnect all three phases at
contactor in case of overtemperature.
For other 3phase models, it is recommended to install the
discharge thermostat with cut out temperature not more
than the maximum discharge gas temperature specified
in Table 2.
Overheating could be due to compressor working at high
compression ratio (low evaporating and high condensing
pressure); loss/ inadequate charge; or condenser fan not
working. Time must be allowed for the compressor to cool
down before the thermostat auto reset.
For scroll compressors with motor protection code "F", an
internal line break motor protector is located at the center
of the Y of the motor windings (motor located in low
pressure dome), to disconnect all three phases in case
overcurrent or overtemperature condition. The protector is
the automatic reset device containing snap action bimetal
switch which reacts to a combination of motor current and
motor windings temperature. When the internal motor
protector has tripped, it will take 30 to 40 minutes to reset
and then the compressor will restart.
On a field application, when the internal motor protector
has tripped, the compressor will stop while each of 3
terminals is still energized, to which either the customer or
serviceman may regard the compressor as fail down.
Therefore, the above-mentioned situation should be taken
into consideration.
Units with microchannel condenser
•
Care must be taken during charging a unit where a
R134a
microchannel condenser coil is fitted.
•
The microchannel coils hold less refrigerant than
13
traditional fin/tube coils, it is easier to be overcharged,
especially if the system is commissioned during
13
wintertime which ambient temperature is colder.
10
•
If too much refrigerant is added, this may cause
N/A
tripping of the high-pressure switch in warmer weather.
•
Always check that the amount of condenser sub cooling
is not excessive which may indicate refrigerant
overcharge.
System operation
•
Once the system is correctly charged with refrigerant
and the operating condition is stable, check that the
compressor suction superheat is between 10K~20K
and that the compressor discharge temperature is
between 50°C~ 90°C.
•
A compressor suction superheat that is too low may
indicate liquid refrigerant return to the compressor,
Fan control Switch (barg)
Cut in Differentiate
16 7
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