Voltage Monitoring Device; Vapor Injection Controller; Mg73Bf; Exd-Hp1 - J&E Hall V3 FUSION Technical Manual

whereas a suction superheat that is too high will not
provide enough cooling effect for the compressor and
will cause high discharge temperatures. In either case,
it is likely that compressor damage/failure will occur.
Precautions when operate with FH and AJ
Compressor
Follow instructions below when operating R448A/R449A in
low temperature condensing unit which integrated with
Tecumseh compressor FH/AJ.
Limit the suction superheat below 10K, to
ensure discharge temperature is maintained
below 120ºC with evaporating temperature
of -30ºC and below. Do not use capillary
tubes as throttling devices to prevent plugging issue.
Voltage Monitoring Device MG73BF
(Applicable to JEHS-1400-B4-L-3 EVI; JEHS-1300-B4-M-3
and JEHS-1500-B6-M-3 units only)
Only the above models are equipped with voltage
monitoring device to monitor the input power supply to
protect the 3-phase compressor from overheating as result
of working under phase lost, undervoltage or overvoltage.
Table 8: LED indication on front plate of MG73BF
LED
ON
(ON/OFF)
Condition
Power ON ON
Phase reverse ON
Asymmetry ON
Under voltage ON
Over voltage ON
Phase Fail BLINK
Phase Fail when
input voltages lower
than UV set point BLINK
and below
asymmetry
Neutral Fail ON
The off-delay timer will turn the system off after a set
amount of time for following situation:
•
Supply phases exceed over
voltage or under voltage trip
level setting
•
Any supply phase failure
•
Line interruption
•
Phase reverse occurrence
•
Neutral failure
Issue: 01.06.2023
BLINK:
UV OV ASY, ON:
REV
OFF OFF OFF
OFF OFF ON
OFF OFF BLINK
ON OFF OFF
OFF ON OFF
OFF OFF OFF
ON OFF BLINK
BLI
BLINK BLINK
NK
Vapor Injection Controller EXD-HP1
(Applicable to EVI units only)
The controller EXD-HP1 used in the EVI units operates as an
economizer control. The setting of the controller is factory
pre-set and is password protected. Users are not
recommended to change any settings in the controller.
Electronic expansion valves in the EVI unit
are in partially open condition. Do not
charge the system with refrigerant before
closure of valve.
Four main parameters Password (H5), type of function
(1uE), refrigerant type (1u0) and pressure sensor type (1uP)
can be set only when digital input DI1 is off
(open) while the power supply is ON (24Vac).
Digital input Di1
• The digital status is dependent on the operation of
system's compressor or demand.
Table 9: Digital input status of EXD-HP1
Operating Condition
Compressor starts
Compressor stops
Electrical checked/modified before start-up
•
To fully close the EEV, open circuit Di1-gnd of controller
through disconnecting the supply to compressor. For
1. Model JEHS-0951/1150-B4: remove the jumper
wire from terminal block labeled 8 and 9.
2. Model JEHS-1300-B5: remove twin jumper bars
from terminal blocks labelled 6 and 7.
•
Switch ON the motor rated circuit to turn ON the power
supply 24V to the controller EXD-HP1. The valve will
be driven to a close position.
•
After closure of the EEV valve, start charging the
system with refrigerant.
•
Disconnect power supply through motor rated circuit
breaker, then reconnect back the original wiring from
factory.
•
Do not apply voltage to the system before all cable
connections are completed.
•
Use a class II category transformer for 24 Vac power
supply. Do not ground the 24 Vac lines.
•
Higher voltage than specified will permanently
damage the controller.
•
When connecting wires of EEV and pressure sensor
4~20mA to the controller EXD-HP1, follow the cable
color to connect to the respective abbreviation color
code printed on the EXD-HP1. Example for EXV: BR =
Brown; BL = Blue etc. Or refer to wiring diagram for
electrical connections.
Di1 status
Closed (Start)
Open (Stop)
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