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Direct Drive Fluid Coolers 

IOM 1062 

The  electronic  temperature  control  must  be  set  for  heating  or  cooling  application  by 
placement of the mode jumper. Temperature setting is selected based on entering or leaving 
fluid temperature control. Differential settings are selected to prevent excessive fan cycling 
and fluid temperature swing. 

Definitions 

 

Cut-in: The temperature at which the N.O. (Normally Open) SPDT (Single-Pole, 

Double-Throw) output relay contact closes. 

 

Cut-out: The temperature at which the N.O. SPDT output relay contact opens. 

Control Functions 

The  A419  control  allows  the  user  to  set  a  variety  of  functions  using  the  keypad  and 
jumpers.    These  functions  are  described  below.    For  instructions  on  setting  function 
parameters, see the 

Adjustments 

section. 

Keypad Programmable Functions 

Setpoint  (SP)

  establishes  the  temperature  at  which  the  equipment  is  switched  on  or  off, 

depending  on  the  user  selected  mode  of  operation.  Setpoint  range  is  -30  to  212°F  (-34  to 
100°C). See the 

Cooling/Heating and Setpoint Modes 

section on page 22. 

If Setpoint mode is set to Cut-in, the setpoint is the temperature at which the control closes 
the  N.O.  contacts.    If  Setpoint  mode  is  set  to  Cut-out,  the  setpoint  is  the  temperature  at 
which the N.O. contacts open.  Refer to Figure 9 and Figure 10. 

Differential  (dIF)

  establishes  the  difference  in

 

temperature  between  Cut-in  and  Cut-out.  

The  differential  is  set  relative  to  Setpoint  and  may  be  set  from  1  to  30F°  or  C.    Refer  to 
Figure 9 and Figure 10. 

Anti-Short  Cycle  Delay  (ASd)

  establishes  the  minimum  time  that  the  fan  remains  off 

before restarting again.  The anti-short cycle delay is activated when the A419 control has 
cycled the fan off.  The delay does not allow the fan to be restarted until the programmed 
amount of time has elapsed.  When the delay is activated, the LCD alternately flashes the 
sensor  temperature  and ASd.   The  anti-short  cycle  delay  may  be  programmed  for  0  to  12 
minutes in 1-minute increments. 

For example, if the anti-short cycle delay is programmed for 7 minutes, the control will not 
restart  the  fan  until  7  minutes  after  the  equipment  was  turned  off,  regardless  of  the 
temperature.  During the 7-minute period, if the temperature reaches the cut-in setpoint, the 
display alternates between the sensor temperature and ASd to indicate that the on cycle is 
being  delayed.   After  the  7-minute  delay  has  elapsed,  the  fan  is turned on, and ASd stops 
flashing.

 

Note

:  A power interruption to the control will activate the anti-short cycle delay. 

Figure 7, Anti-short Cycle Delay 

 

 

Summary of Contents for IOM 1062

Page 1: ...on Operation and Maintenance Manual IOM 1062 Group Chiller Part Number 331375001 Effective January 2010 Supersedes IOM AFSD 2 Direct Drive Fluid Coolers Type AFS 005 through AFS 107 Type AFD 046 throu...

Page 2: ...col Sludge Prevention 10 Fluid Circulating Pump 10 Ambient Conditions 11 Physical Data 11 Dimensional Data 13 Electrical Data 15 Electrical Wiring 15 Wiring Diagrams 18 Start Up 19 Prestart 19 Filling...

Page 3: ...IOM 1062 Direct Drive Fluid Coolers 3...

Page 4: ...tion A Fan Cycling Thermostat with Control Transformer 120V E Control Transformer Only 120V Y None Rough Duty Options A Totally enclosed motors B Sealtite Wiring C PolyGuard fin coating with totally e...

Page 5: ...ceed 2 5 All controls and equipment protection circuits properly connected per wiring diagram 6 Factory installed wiring must not be changed without written factory approval 7 Relief valves must meet...

Page 6: ...ab with footings extending below the frost line Be certain concrete slabs are installed level and are properly supported to prevent settling Locate the unit far enough away from any wall or other obst...

Page 7: ...l Walls or Obstructions Locate the unit to ensure that air can circulate freely and not be recirculated For proper air flow and access all sides of the unit must be at least the distance shown away fr...

Page 8: ...m should provide maximum leak prevention Weld or sweat joints should be used where possible The fact that glycol solutions or other heat transfer fluids will leak where water will not must be taken in...

Page 9: ...26 3 60 2 2 1 8 7 9 7 0 80 2 2 1 8 13 7 12 0 100 2 1 2 2 5 8 8 5 6 1 150 2 1 2 2 5 8 18 6 12 9 200 3 3 1 8 10 7 9 1 250 3 3 1 8 16 5 13 7 300 3 1 2 3 5 8 11 1 9 2 300 4 4 1 8 5 9 4 9 350 4 4 1 8 7 9 6...

Page 10: ...o sludge formation in coils due to one or more of the following causes Reaction of the corrosion inhibitor with galvanized piping zinc Reaction of the glycol with chromate type water additives Reactio...

Page 11: ...in older systems have non operating standby pumps of equal capacity to the operating unit We recommend parallel pumps in continuous operation because they provide practically the same type of standby...

Page 12: ...00 21 7 1650 1760 1839 071 1x4 4 41 500 21 7 1760 1870 1949 075 1x5 5 54 900 20 4 2000 2150 2177 079 1x5 5 54 800 26 6 2020 2150 2251 089 1x5 5 51 800 26 6 2200 2390 2431 097 1x6 6 65 800 31 6 2390 26...

Page 13: ...hes AFS Model Number of Fans A B 005 1 39 30 008 1 49 40 010 2 69 60 012 2 69 60 014 2 89 80 016 2 89 80 021 3 129 120 NOTES 1 Inlet is the top connection outlet the bottom See Table 4 on page 11 for...

Page 14: ...r 42 inches 2 Inlet is the top connection outlet the bottom See Physical Data beginning on page 11 for connection sizes 3 The electrical box is on the same end as the fluid connections with knockouts...

Page 15: ...ead of starters requiring thermal protectors eliminating the problem of furnishing the proper heating elements All fluid coolers are furnished with either single phase or three phase fan motors which...

Page 16: ...071 1x4 4 35 710 28 0 29 8 30 14 0 14 9 15 11 2 12 0 15 075 1x5 5 46 610 35 0 36 8 40 17 5 18 4 20 14 0 14 8 15 079 1x5 5 46 200 35 0 36 8 40 17 5 18 4 20 14 0 14 8 15 089 1x5 5 44 580 35 0 36 8 40 17...

Page 17: ...2 0 12 5 15 107 1x6 6 28 8 30 0 30 14 4 15 0 15 12 0 12 5 15 AFD Double Row of Fans 046 2x2 4 19 2 20 4 25 9 6 10 2 15 8 0 8 5 10 054 2x2 4 19 2 20 4 25 9 6 10 2 15 8 0 8 5 10 060 2x2 4 19 2 20 4 25 9...

Page 18: ...18 Direct Drive Fluid Coolers IOM 1062 Wiring Diagrams Figure 6 Typical Wiring for AFS Models NOTE Unit specific wiring diagrams are shipped with the unit...

Page 19: ...mped into the system Temperature Control General Some method of controlling the fluid temperature is required The standard temperature control consists of fan contactors arranged for field connection...

Page 20: ...t mode is set to Cut out the setpoint is the temperature at which the N O contacts open Refer to Figure 9 and Figure 10 Differential dIF establishes the difference in temperature between Cut in and Cu...

Page 21: ...per at P4 establishes whether Setpoint is the Cut in temperature or Cut out temperature Keypad Lock Removing or installing the jumper at P5 establishes whether the keypad is locked or unlocked Locking...

Page 22: ...gs Output Relay Status Indicator LED A green LED on the control s front panel illuminates when the output relay is energized and the N O contacts are closed Cooling Heating and Setpoint Modes Jumpers...

Page 23: ...energizes and LED indicator illuminates when the temperature drops to Setpoint minus the differential value When the temperature rises to Setpoint the output relay and LED indicator de energize Figure...

Page 24: ...on a jumper in the Removed position place the jumper on only one pin Saving the jumper in case it is required in the future See Figure 11 Set the jumpers as follows using Figure 11 and Figure 12 as gu...

Page 25: ...9 control is set at the factory to display in Fahrenheit temperature units To convert to Celsius units press the Up and Down buttons simultaneously Press them again to return to Fahrenheit units Note...

Page 26: ...n mode and setpoint plus differential is greater than 212 F 100 C the control switches on at setpoint and off when the temperature exceeds 212 F 100 C Cooling Cut out If the control is operating in Co...

Page 27: ...sly programmed value for that function Checkout Before applying power make sure installation and wiring connections are according to job specifications After necessary adjustments and electrical conne...

Page 28: ...thermometer c Disconnect the sensor from the control d Using an ohmmeter measure the resistance across the two sensor leads while the sensor is at the temperature taken in step b e Consult Figure 14...

Page 29: ...gized at Output Relay De energized at Cooling Setpoint plus differential Setpoint Cut out Heating Setpoint minus differential Setpoint Cooling Setpoint Setpoint minus differential Cut in Heating Setpo...

Page 30: ...he unit coil will require periodic cleaning based on operation and atmosphere conditions Clean the unit using a brush or commercially available coil cleaners and water Take care not to deform the fin...

Page 31: ......

Page 32: ...ining or call 540 248 9646 and ask for the Training Department Warranty All Daikin equipment is sold pursuant to its standard terms and conditions of sale including Limited Product Warranty Consult yo...

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