Summary of Contents for NELSEN WATER NRO ROC2HE-UL
- Page 1 Since 1954 Nelsen NRO ROC2HE-UL System Controller Documentation Systems w/CPU-4 Control Board Manufactured after March 2020...
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Page 3: Table Of Contents
Table of Contents Contents Page # ................................................................. Specifications, Table 1 ............................................................Schematic, Figure 1 .............................................................. Controller Overview, Figure 2 ....................................................... Controller Detail: CPU-4 ..........................................................Controller Detail: TB-1 ............................................................Conductivity Probe Installation, Figure 5 ................................................Installation Instructions ........................................................... Controller Programming: Accessing Hidden Menus, Figure 6 .................................. -
Page 4: Specifications, Table 1
Table 1 - Specifications Inputs Tank level switches (2) Normally-Closed. Can be used with a single level switch. Inlet pressure switch Normally-Open. Pretreat lockout switch Normally-Open. The Tank, Low Pressure and Pretreat inputs are 50% duty cycle square wave, 10VDC peak @ 10mA max. The switch inputs are dry contacts only. -
Page 5: Schematic, Figure 1
Figure 1 - Simplified Schematic... -
Page 6: Controller Overview, Figure 2
Figure 2 - Controller Overview Display Keypad (4 line, 20 character) System ON/OFF, Clear, concise feedback on the RO’s status. Up Arrow Alarm Down Arrow Display backlight Manual Run, flashes along with Manual Flush audible beeper to indicate alarm condition. CPU Board (CPU-4) Terminal Board (TB-1 Re-E) Conductivity Probe... -
Page 7: Controller Detail: Cpu-4
Figure 3 - Controller Detail: CPU-4 Typical Configuration Cable to Terminal Board Permeate Conductivity Probe Typical Configuration... -
Page 8: Controller Detail
Figure 4 - Controller Detail: Terminal Board, TB-1 (See Fig. 1 for schematic) -
Page 9: Conductivity Probe Installation, Figure 5
Figure 5 - Conductivity Probe Installation Install the Conductivity Probe in the “Run” of a Tee or equivalent location. Orient the Conductivity probe so that air can not become trapped in Probe the area near the probe. FLOW Installation 1 Drill the enclosure as needed and install liquid- 10 Program Mode 2 is default (See Table 2) which is tight fittings for the wiring. -
Page 10: Controller Programming: Accessing Hidden Menus, Figure 6
Figure 6 - Controller Programming: Accessing the Hidden Menus 1 With the System ON, Press and Hold the Up and Down Arrows. 2 With the Up and Down Arrows depressed, Press the System On/Off button. The menu will switch to the RO Presets menu shown in Figure 7. -
Page 11: Controller Programming: Program Selections, Table 2
Table 2 - Controller Programming: ROC2HE Program Selections The controller has 4 separate, user-selectable sets of settings for configuring the RO. The factory default settings are shown below. The settings are identical except for variations in the flush behavior. • Program 1, High Pressure flush •... -
Page 12: Controller Programming: Menu Navigation, Figure 7
Figure 7 - Controller Programming: Menu Navigation... -
Page 13: Controller Fault Displays
Controller Fault Condition Displays Below are examples and explanations of the displays which accompany the fault conditions possible on the CPU-4. Fault conditions always indicate a problem of some sort which requires corrective action. the displays provide sufficient information to recognize the source of the fault and the required corrective action. Low Pressure Fault: (System is responding to low pressure condition per system settings) Line 1 “Service Fault”... - Page 14 Controller Fault Condition Displays If RO Not Working and Display Shows “Tank Full” or “Tank Full Draw Down” 1. If using a single point high level float switch, the jumper in the wiring instructions must be installed. This needs to be checked to make sure it is not loose and or disconnected, which would cause a failure and one of the displays above.
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Page 15: Warranty
Appendix C - Controller Limited Warranty Nelsen Corporation (“Nelsen”) provides this limited warranty as described below (the “Limited Warranty”). Limited Warranty Subject to the terms of this Limited Warranty, Nelsen warrants to the original buyer (“Buyer”) of this Water Conditioner product (the “Product”) solely from a Nelsen authorized dealer that the Product will be free from defects in material or workmanship for a period of one (1) year after the date of original installation. - Page 16 Appendix C - Controller Limited Warranty - continued Repair or Replacement/Credit Subject to the conditions and limitations herein, if Nelsen determines that the Product, or any part therein, does not conform to this Limited Warranty, Nelsen will repair or replace the defective Product or part therein. Non-conforming Products or parts therein must be returned to Nelsen’s authorized dealer at Buyer’s cost.