Nibe CLIMACOOL UCR 30, Installation, Operation & Maintenance Manual

69

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Stainless Steel Strainer Option

Operation Instructions  

Flush valve line must be piped to atmospheric pressure such 

as an open floor drain. The flush line should not undergo 

any changes in elevation and should be sloped downward in 

the direction of drainage . 

Do not pipe the flush or drain line 

into a pressurized line.

Note: 

The Automatic Timer Flush Package needs to be 

programmed when it is received by the end-user . The 

programming is simple and takes only a few moments . 

However, because every application has different 

parameters that affect the required frequency between 

flushes and the duration of the flush, the end-user must 

choose the controller’s settings (refer to the specific 

strainer manual) .

To Program the ATF Controller

1 . 

Plug the transformer into a 120-VAC outlet . 

2 . 

Insert the 12-VDC plug coming from the transformer into 

the jack on the underside of the ATF box . 

3 . 

Test for power by pressing the manual flush side of the 

control switch (lower switch light should come on then 

the valve will start to open) .

4 . 

Adjust the “ON TIME” (Valve Open) by turning the 

inner timer ring with the GREEN POINTER clockwise to 

increase duration . The ON TIME RANGE is factory set at 

eight seconds (see Figure 29) .

5 . 

Adjust the “OFF TIME” (Valve Close) by turning the 

outer ring with the RED POINTER clockwise to increase 

duration . The OFF TIME RANGE is factory set at twenty-

four (24) hours (see Figure 29) .

6 . 

Set the control switch to auto flush. The red off light on 

the timer will come on and the upper light on the switch 

will come on and stay on. During the flush cycle the on 

light on the timer and the lower switch light will come on .

Control Switch

Control switch flushing is initiated by pressing and holding 

down the manual control switch located on the front of the 

controller (see Figure 30). The manual flush control switch 

can also be used to conveniently drain the water out of the 

strainer before removing the conical screen element from 

the strainer housing . A yellow indicator arrow on top of 

the ATF valve will rotate in sync with the ball valve to show 

the valve position (open or closed). When the manual flush 

control switch is released, the valve will automatically close .

SAFETY FIRST!  -  Keep fingers away from valve opening 

to avoid getting caught in the moving parts. The electric 

motor supplied a sufficient amount of power to cause 

personal injury. Take precaution when handling.

Water Resistance  

The valve and controller are water-resistant, but not 

water-proof . Do not install below ground level where the 

component can be submerged in water . Only remove 

the cover plate from the valve controller when setting or 

changing the flush settings. Keep the cover tightly sealed on 

the unit during normal operation .

Pressure Differential Alarm Package Option

The pressure differential alarm (PDA) option continually 

monitors and displays the strainer’s inlet and outlet 

differential pressure. When the strainer element (conical 

strainer basket) becomes significantly clogged, the pressure 

differential switch-gauge will trigger an audible siren and a 

visual flashing alarm light. These alarms are intended to alert 

maintenance personnel that the strainer element must be 

removed and cleaned (see Strainer Element Cleaning on page 

67) .

Figure 32

PSID High 

PSID Low 

Pressure Differential Alarm (PDA) option

Alarm Reset Button 

FRONT  

VIEW 

LEFT SIDE 

VIEW 

Power To ATF 

110 Volt/12 Volt DC 

Wall Transformer 

Visual

Alarm  

Audible 

Alarm 

Pressure Differential 

Switch-Gauge 

LED Power Indicator 

Differential  

Set-Point Contact 

Cover-Plate Screw (4) in Corners of 

Box (DO NOT REMOVE). 

Visual

Alarm  

RIGHT SIDE 

VIEW 

TOP  

VIEW 

BOTTOM 

VIEW 

AUX Contacts 

(On or Off with Alarm) 

Red & Black

Cable Retainer 

Operation Instructions  

Remove the power supply and insert the connector end into 

the socket on the bottom of the PDA housing (See Figure 

32 above) and plug the transformer into the power source . 

Standard systems are supplied with a 120V power supply to 

the primary of the transformer, with an output secondary of 

12 VDC. The pressure differential switch-gauge is factory set 

to 7-8 psi. The CS strainer operates at a pressure differential 

slightly less than 1 psi during maximum flow when the 

strainer screen is clean. By the time the differential pressure 

reaches 7-8 psi, the strainer element will be significantly 

clogged and require immediate removal and cleaning . To 

adjust the pressure differential switch-gauge setting, insert 

a 1/16” allen wrench and rotate the differential set point 

contact to the desired location (see Figure 27) . 

Note:

 It is not 

recommended to set the differential switch-gauge higher 

than 10 psi . Disabling the alarm or increasing the alarm set 

point could result in damage to the strainer element and 

allow debris to pass into the system .