91
Display:
To exit manual mode, press
Reset
.
The expansion valve will automatically return to automatic mode if no buttons are pressed on the console for 15 minutes.
23.2.3 Control of electronic expansion valve at start-up if P42 = CIAT:
Comment:
- The expansion valve
‟s percentage of opening and slow mode (set to „No‟) are forced when the compressor is turned on.
- The percentage of opening values in air conditioning and heat pump modes as well as the forcing time can be adjusted using their
corresponding parameters.
23.2.4 Control of the LP sensor:
If P42 = CIAT:
- The LP sensor fault has a time delay of 120 seconds at power-up. It is not taken into account when the unit is off or at the end of the
defrosting cycle during pressure balancing.
- The default value of P36 and P38 becomes 17.3 b.
24 IMPORTANT INFORMATION REGARDING THE CONTROL OF AN INVERTER COMPRESSOR
- Parameters P195 (
ΔP for power reduction) and P144 (interstage differential) are visible even though there is just one compressor. P144
(interstage differential) has an adjustment range of 0.5 to 10°C.
- Parameters P145, P146, P147 and P148 are hidden if P7 = I
NVERTER
and supply control is selected. On the other hand, when P141 = supply
or return, parameters P143 and P144 remain visible and are set to a default value of 1.5°C.
- Output 3 (stage 2, circuit) on terminal block J3 on the motherboard is used to inform the variable speed drive of any faults requiring the
compressor to be shut off. As a result, the compressor will be shut off if a fault is detected (the contact opens).
- Start-up time delay: P66 (Visible only if P7 = I
NVERTER
. Default value of 120 seconds. Adjustable between 0 to 300 seconds in 30-second
increments).This time delay corresponds to the minimum time allowed for the compressor control voltage to reach its maximum value of 10 V
(value corresponding to the compressor
‟s 90 Hz frequency). In other terms, the compressor will not reach 90 Hz until the end of this time delay
even if it is requested to do so by the network
‟s heat load.
- Parameter P192 (maximum fan speed threshold) becomes visible. Its default value is 8.0 V.
- The order in which the compressors turn on and off will be given via output 2 on terminal block J3 on the motherboard (stage 1, circuit 1).
- The compressor speed will be adjusted by an 0-10 V modulating signal (output 2-3 on terminal block J2 on the motherboard).
The following protections are enabled only if P7 = I
NVERTER
:
These limitations are due to the compressor technology.
A) If the evaporating temperature drops to or
b
elow -20°C for 1 minute:
The minimum frequency in both heating mode and cooling mode becomes 50 Hz until the evaporating temperature rises to or above -15°C for
1 minute.
B) If the condensing
temperature rises to or above 60°C
for 1 minute
:
The minimum frequency in both heating mode and cooling mode becomes 50 Hz until the condensing temperature rises to or above 58°C for
1 minute.
C) Maximum pressure difference:
- During water heating:
If HP
≥ 4 × LP + 13.5, 120 after start-up, C
ONNECT
2
adjusts the control setpoint so as not to push the compressors near their limits too often.
If necessary, a coil defrosting cycle will be forced on.
Information message:
- During water chilling:
If HP
≥ 4 × LP + 13.6, the unit reduces its power by either reducing the compressor speed to 50 Hz or by turning off the compressor.
Information message:
Fault function: (enabled in cooling mode and heating mode)
Operation:
The max.
Δp threshold is set at HP 4 × BP + 15.6
If this fault causes at least 5 shutdowns in 24 hours:
- Corresponding circuit shut off.
- 30 min. time delay (in seconds in test mode)
- Fault output off
- Circuit fault LED on console flashes.
E X V T E S T C X
O P E N I N G X X X %
U N I T
Δ
P b a r L I M I T
O P T I M I S E D O P E R A T I O N
C P D E L T A P L I M I T
P W R R E D U C T I O N x x m n
F A U L T D E L T A P x x m n
x C U T ( S ) I N 2 4 H
Summary of Contents for Magister 2 Series
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