The GR03/GR3 controller user manual can be used to set up all stand-alone and BMS installations which will operate with standard environmental conditions. Do not attempt to adjust the control parameters without having read and understood the manual. The NRL unit arrives with a basic operating program ready to start up …
The GR03/GR3 control system consists of two components which are the GR03 display screen touchpad and the GR3 control module. All changes to the factory set operating parameters are completed by configuring the two sets of dipswitches and installing set of terminal jumpers (bridges). Then the soft valves can be inputted …
Power up the line voltage wiring 24 hours before start up to allow the oil to warm up and drive off any refrigerant in the compressor oil. In the event line voltage power is off for any length of time during the unit’s normal service life (for more than four …
Using the local / remote switch toggle to the local position. The green led light will turn on. Using the mode button toggle the switch to heat or cool as required. The green led will turn on and indicate the working mode. Push the start button on the GR03 display …
Push the alarm button (red bell) once to see the latest error code. Record same push the alarm button (red bell) again to see 2nd last error code. Record same scroll through historical listed error codes.
(CP1 power, CP1A power, CP1B power, CP2 power, CP2A power, CP2B power) Parameters CP1 power to CP2B power (up to 6 steps) can be used to shut down an individual compressor requiring service or for reasons. The compressors % of load number must be changed to zero. The GR3 will …
(CP1, CP1A,CP1B, CP2. CP2A, CP2B, 111111) Parameters CP1 to CP2B (up to 6 steps) can be used to shut down an individual compressor requiring shut down for load shedding purposes. Each compressor up six is identified by a 1 in the number string 111111. The individual compressor will not start …
(MP1, MP1A, MP1B, MP2, MP2A, MP2B, RMV1, RMV2) If any of the compressor protection (wired in series) devices trip the safety circuits M9.1 to M9.2 or M12.1 to M12.2 is opened shutting down the NRL circuit completely. A solution is to disconnect the defective compressor or control electrically. Install a …
(MT(V)1, MT(V)1A, MT(V)1B, MT(V)2, MT(V)2A, MT(V)2B, RMV1, RMV2) If any of the fan protection (wired in series) devices trip the safety circuits M9.1 to M9.2 or M12.1 to M12.2 is opened a solution is to disconnect the defective motor or control electrically. Install a jumper on the overload or relay control contacts. …
All 60 cycle NRL’s are equipped with an AP (HP) transducer which provides an analogue signal to the gr3 controller. The trip point for the AP (HP) transducer can be adjusted from downward from 39 bar (566 PSIG). To suit site conditions. The manual AP (HP) reset control cuts out at 41 …
The hot gas temperature (HGT) cut-out switch is mounted on the discharge line. It will trip if the HGT exceeds 135 deg. C. (275 deg. F.) On earlier models the hot gas temperature switch (HGT) was wired directly in series with the manual high pressure relay contacts rap1. On later models the …
All 60 cycle NRL’s are equipped with a BP (LP) transducer which provides an analogue signal to the GR3 controller. The manual low pressure switch is optional.
Chillers, free cooling units, heat pumps The low pressure and high pressure transducers can be removed from the system without removing the charge from the system as they are fitted with a schraeder check fitting. Units that are fitted with a low pressure switch from the factory are also equipped with a …
Chillers and free cooling units only, not for heat pumps Close the liquid line valve. Pump down the compressor section. Close the hot gas line. Reclaim the refrigerant trapped between the evaporator and hot gas line by accessing the schraeder valve in the hot gas line. Make the repairs. Pressure test. …
Heat pump units do not have isolating valves at the hot gas and liquid lines. Therefore any repairs on the refrigerant circuit at the compressor will require all of the refrigerant to be removed from the unit.
Chillers and free cooling units only, not for heat pumps depending on the model of the NRL the liquid line and discharge lines are equipped with isolating valves. The liquid line valve can be closed, the compressor section can be pumped down to one or two pounds, the hot gas line …
Depending on the size of the NRL the liquid line and discharge lines are equipped with isolating valves. The liquid line valve can be closed, the compressor section can be pumped down to one or two pounds, the hot gas line valve can be closed. The remaining refrigerant pressure can be vented. …
Chillers, free cooling units, heat pumps Depending on the model of the NRL the liquid line and discharge lines are equipped with isolating valves. The liquid line the refrigerant charge must be completely replaced along with the liquid line filters in the case of a burnout. All of the oil in the …
Chillers, free cooling, heat pumps The factory approved repair is to replace the defective compressor only. The liquid line filters and oil will need to be replaced as required by the acid test.
The AP (HP) transducer is factory set to 39 bar (565 PSIG). The manual AP (HP) manual reset switch is set for 42 bar (609 PSIG). The AP (HP) relief valve is set to release refrigerant at 45 bar (652 PSIG). It is possible that the unit will totally shut …
Chillers, free cooling, heat pumps. 2 circuits up to 3 compressors per unit. The press f. Parameter can also be used on units with as few as 2 compressors. The transducer will shut off one compressor. Wait 5 minutes (time out). Then the GR3 will turn the compressor back on. If the …
GR3 test procedure: Switch off the power to the unit Change the position of the sw2 dip switch # 4 to on. Change the position of the display dip switch 1 to 8 as follows on off on off on off on off. Turn the power supply back on. The …
Chillers and free cooling units only, not for heat pumps Depending on the size of the NRL the liquid line and discharge lines are equipped with isolating valves. The liquid line valve can be closed, the compressor section can be pumped down to one or two pounds, the hot gas line …
Chillers, free cooling, heat pumps The factory approved repair is to replace the defective compressor only. The liquid line filters and oil will need to be replaced as required by the acid test.
We use 2 heater of the code 6406802 in each plate. Each are 150W and 230V.
The Moducontrol 4.2 service manual is available from Aermec. The Moducontrol manages the ANK series best when the various parameters remain as factory set points.
The updated replacement Moducontrol replaces all previous versions of the control. The new module must be addressed via the dipswitches and internal electronic switch according to the new revised manual. New Module Revision Number. Use New Manual. Any new features that are built into the new Moducontrol will automatically be part of …
