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Instructions
Module B plus is an electronic circuit board
used in P02 version models for automatic liquid
injection into compressor scrolls set using an
electronic expansion valve.
LED 2
Module B Plus
Module B plus is covered by touch protection
cover as Picture 6.
Do not remove touch protection cover unless
required. Switch of the unit before removing this
cover.
LED2
Picture 6
Application
Module B Plus controls liquid injection, and it also
monitors the following parameters: Discharge gas
temperature, phase sequence and phase failure.
Functional description
• Liquid injection
- Module B Plus can control discharge gas
temperature. The default set point is 125 °C, this
is required to run the condensing unit within
safe envelope.
Do not change this set point.
- When compressor stops the liquid injection
Yellow
Red
Category
Blink
Blink
Times
Times
DGT Overheat
1
static/ DGT
Reset Delay
DGT Overheat
2
Lock
Discharge
gas
1
DGT out of
temperature
3
range
DGT Sensor
4
Open / DGT
Sensor Short
Phase Loss
1
Triple Phase
2
Phase Reverse
2
Table 1: Error Blink Code (LED 2 Yellow -Red Blink code)
© Danfoss | Climate Solutions | 2023.05
19 - Module B Plus - User guide
valve will be closed within 6 seconds.
• Discharge gas temperature overheat protection
- Discharge gas temperature sensor from Module
B Plus can detect discharge gas temperature
within the range -50 to 180°C, temperature
measurement
sensor is installed within 150mm from
compressor discharge port.
LED 1
- If the discharge gas temperature is higher than
Overheat Trigger Point (set point + 10 K)within
1 second, alarm relay (J5) will open. This status
is named as DGT Overheat Static referring to
Table 1. If the discharge gas temperature lower
than Reset Point (Set Point -15 °C) continuously
for 5 minutes, the alarm relay (J5) will close. This
5 minutes delay status is named as DGT Reset
Delay.
- If the discharge gas temperature overheat
more than 5 times within 1 hour, alarm relay
(J5) locks on open status and only can be
reset by resetting Module B Plus power supply
manually (switch-off the unit and switch-on
again after some time). This status is named
as DGT Overheat Lock, refer table 1 for error
LED1
identification.
- If discharge gas temperature sensor is
malfunction, i.e. Sensor Open, Sensor Short
circuit or Out of Range, alarm relay (J5) locks
on open status too, refer table 1 for error
identification.
• Phase protection
- Phase sequence and missing phase detection
will only be performed every time the
compressor was powered on. If a wrong phase
status Phase Loss or Phase Reverse detected,
within 4.5s to 5s, alarm relay (J5) will open and
lock on open status. This lock on open status
only can be reset by resetting Module B Plus
power supply manually, refer table 1 for error
identification.
• User interface
- Module B Plus powers on, power LED 1 will
be solid red all the time. When the Module is
powered off, power LED 1 will be off. If Module
Error
Description
Discharge gas temperature
is higher than compressor
stop trip point
DGT Overheat Static occurs
5 times within 1 hour
DGT is out of normal range
(-50 ... 180°C)
Discharge gas temperature
sensor open/short circuit
One phase signal loss
Incorrect phase connection Check 3-Phase power supply (J2) to Module B Plus, if 3 phases are in correct sequence. If not,
accuracy
±0.5°C.
Discharge
Check if Optyma Controller shows safety alarm (A97). If yes, wait till it gets resolved
automatically. If this error is observed frequently, check if unit is running in recommended
envelope.
Reset Module B Plus supply manually (switch-off the unit and switch-on again after some
time).
Check if discharge gas temperature sensor is mounted properly on discharge line. Check
discharge gas temperature on Optyma™ Plus controller parameter U27 (should be within -50
... 180°C).
Check discharge temperature sensor and connection.
Check 3-Phase power supply (J2) to Module B Plus, if one of the 3 phases is missing. If yes, do
correct power supply connection and reset Module B Plus manually (switch-off the unit and
switch-on again after some time).
do correct power supply connection in sequence and reset Module B Plus manually (switch-off
the unit and switch-on again after some time).
B Plus powers on and has no error, status LED 2
will be solid green on. Refer picture 6 for LED 1
and LED 2 location on module B plus.
- If Module B Plus powers on, and detects an error,
status LED 2 will be yellow and red blinking one
second alternately. Detail blink code see table 1.
Overheat Trigger Point ( Set Point +10 K)
135
Liquid injection zone
140
130
120
110
100
DGT reset delay (5 min)
90
< 60 min
80
0
10
20
30
40
Alarm relay (J5) Close
DGT Overheat static
(Compressor start)
(Compressor stop)
Picture 7.
• Module B plus communication with Optyma™
Plus controller.
- When alarm relay (J5) is open, signal is
communicated to Optyma controller digital
input 2 (DI2), which enables safety alarm (A97)
in Optyma™ plus controller and power supply to
compressor will be stopped immediately.
A3
Module B+
J1
J13
J2
J3
J4
M
R8
M4
K2
3A
M
M1
3~
F1
I > I > I >
Q1
A2
2
4
6
X1
P
N
N
L1 L2
L3
N
Model B Plus wiring diagram
Action
118A2177D - AN37261897352601-010401 | 7
Set Point =125 °C
Set Point -15 K
50
60
70
80
DGT overheat lock
S1
J5
T>
A1
DI1
DI2
Optyma
Plus
Controller 084B
Supply
230Vac
P'
N'
PE
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