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IM 1072-1

Water to Water Source Heat Pumps

Page 35 of 44

Control

Optional Low Temperature Control Board

"LTC" – 460-60-3, 575-60-3, Unit Sizes 360, 420

The control board is powered by 24 volts AC, 50/60 hertz

which is applied to the 24 VAC terminals. The control will

energize the output relays (COM 1 makes connection with NO

1 and COM 2 makes connection with NO 2), only if the tem

peratures of both Sensor 1 and Sensor 2 are above the selected

temperature which is 20

F or 35

Note:

Always disconnect power to WW* unit before moving

jumpers.

While the output relays are energized, the control keeps

monitoring Sensor 1 and Sensor 2 to make sure that the tempera

ture of the sensors is always above the selected temperture, the

control will de-energize both ouput relays until the temperature

of the sensor is 2.5 degrees above the selected temperature. For

example, you set the temperature to 20

F. The output relays will

de-energize when the sensor temperature drops below 20°F.

The control will re-energize the output relays when the sensor

temperature rises above 22.5°F. Additionally, the control will

monitor each individual sensor to make sure it isn't broken or

shorted. If either Sensor 1 or Sensor 2 fails short or open before

or during operation, the control will de-energize both output

relays until the sensor is repaired or replaced.

Table 10: LTC board sensor locations

Model

Sensor 1

Sensor 2

WCA

Liquid Out - Load Coil 1

Liquid Out - Source Coil 1

WHA

Liquid Out - Load Coil 1

Liquid Out - Source Coil 1

WRA

Liquid Out - Load Coil 1

Liquid Out - Source Coil 1

Figure 13: "LTC" board jumper settings

24 VAC

20F

35F

20F

35F

SEN 1

SEN 2

NO 2
COM 2
NO 1
COM 1

AL7815

DISCONNECT POWER TO

WW* UNIT BEFORE MOVING

JUMPERS

Jumper “S1” selects cutout temperature

setpoint for Sensor “SEN 1”.

Jumper “S2” selects cutout temperature

setpoint for Sensor “SEN 2”.

The 20˚F settings are used only on

closed loop systems with antifreeze

solution.

Figure 14: Thermistor temperature vs. resistance graph

10000

20000

30000

40000

50000

60000

70000

100

110

Thermistor Temperature Vs. Resistance

Resistance (OHMS)

Temperature (ºF)

Содержание WRA

Страница 1: ...Group WSHP Part Number 667691802 Date October 2013 Daikin Water to Water Source Heat Pumps 3 to 35 Tons with R 410A WRA Heating and Cooling Models WHA Heating Only Models WCA Cooling Only Models 2013...

Страница 2: ...LTC 208 230 60 3 Unit Sizes 036 048 060 and 072 20 Compressor Control Module Functional Operation 208 230 60 3 Unit Sizes 036 048 060 and 072 21 Wiring Diagram 22 208 230 60 3 Unit Sizes 120 150 180 2...

Страница 3: ...ooling 300 300 000 Btuh Nominal Cooling 360 360 000 Btuh Nominal Cooling 420 420 000 Btuh Nominal Cooling Water Piping Location F Front T Top L Left Hand Side R Right Hand Side Status Lights YY None S...

Страница 4: ...nly used on product labels to signify an immedi ate hazard The signal words WARNING and CAUTION will be used on product labels and throughout this manual and other manuals that may apply to the produc...

Страница 5: ...0 15 4 517 632 9 6 15 15 120 208 230 60 1 2 23 1 134 0 46 2 197 253 52 0 70 70 208 230 60 3 16 1 91 0 32 2 187 253 36 2 50 50 460 60 3 7 1 46 0 14 2 414 506 16 0 20 20 575 60 3 5 6 37 0 11 2 517 632 1...

Страница 6: ...ter pressure and sized for proper flow rate The supply and the discharge pipes should be insulated to prevent condensation damage caused by low water temperature in the pipes If water hammer should oc...

Страница 7: ...rejected from the unit into the source water loop To reject excess heat from the water loop the use of a closed circuit evaporative cooler or an open type cooling tower with a secondary heat exchange...

Страница 8: ...the tables 11 Check for vibrations noise water leaks etc 12 Adjust thermostat to correct mode and set to maintain desired temperature 13 Instruct the equipment owner operator of correct thermostat an...

Страница 9: ...3 4 KO 1 2 KO 3 4 FPT 1 2 FPT Dimensions Size 048 060 Dimensions in Pipe Size FPT Connection Size A B C D E F G H J K L M N P Control Electric Auxiliary Electric Load Source Domestic Hot Water 28 28...

Страница 10: ...ions Size 120 150 Dimensions in Water Connection Size A B C D E F G H K L M N P Q R S Load Source FPT 26 19 12 4 8 22 4 18 41 22 34 1 113 16 37 29 42 1 Dimensions Size 180 Dimensions in Water Connecti...

Страница 11: ...Source Heat Pumps Page 11 of 44 Dimensional Data WRA WCA WHA Size 240 420 Dimensions Size 240 420 Dimensions in Water Connection Size A B C D E F K L M N P Q R S Load Source FPT 31 20 16 4 22 27 63 2...

Страница 12: ...00 50 00 63 125 1130 1230 16 0 16 0 2 00 360 34 00 50 00 63 125 1420 1540 17 5 17 5 2 00 420 34 00 50 00 63 125 1620 1750 20 0 20 0 2 00 Operating Pressures PSIG Cooling Mode Table 4 Models WRA and W...

Страница 13: ...813 0 829 0 937 1 614 50 0 922 0 770 0 789 0 922 1 816 Methanol 10 0 986 0 957 0 961 0 986 1 127 20 0 970 0 924 0 928 0 970 1 197 30 0 951 0 895 0 897 0 951 1 235 40 0 936 0 863 0 865 0 936 1 323 50 0...

Страница 14: ...C P5 P4 P3 P2 P1 300 180 120 90 LPS BYPASS SECONDS DOM ASC R LED OFF NO Y SIGNAL PRESENT ON Y SIGNAL PRESENT 1 BLINK FAULT ON HPS TERMINALS 2 BLINKS FAULT ON LPS TERMINALS LPR AL1701 PK CC Y W OPTIONA...

Страница 15: ...H UNITS 17 14 WHEN FS L AND FS S ARE NOT USED THIS WIRE CONNECTS DIRECTLY TO TERMINAL Y OF CCM WHEN PM IS NOT USED THIS WIRE CONNECTS DIRECTLY TO TERMINAL R ON TB1 4 THIS WIRE CONNECTS DIRECTLY FROM T...

Страница 16: ...ature drops below 20 F The control will re energize the output relays when the sensor temperature rises above 22 5 F Additionally the control will monitor each individual sensor to make sure it isn t...

Страница 17: ...es with the Y signal through the circuit board The 60 psig low pressure switch is connected in series with the Y signal to the processor only This will allow the control to monitor the low pressure sw...

Страница 18: ...ASS SECONDS DOM ASC R LED OFF NO Y SIGNAL PRESENT ON Y SIGNAL PRESENT 1 BLINK FAULT ON HPS TERMINALS 2 BLINKS FAULT ON LPS TERMINALS LPR AL1701 PK CC Y W OPTIONAL HP BK BL BK PR W 24 VAC LTC OPTIONAL...

Страница 19: ...K 12 AWG WIRE NO NUMBER AFTER COLOR CODE INDICATES 18 AWG WIRE FOR EXAMPLE BK IS A BLACK 18 AWG WIRE ASTERISK AFTER DASH FOLLOWING COLOR CODE INDICATES REFERRAL TO COMPRESSOR WIRE SIZE TABLE 8 CHR IS...

Страница 20: ...ature drops below 20 F The control will re energize the output relays when the sensor temperature rises above 22 5 F Additionally the control will monitor each individual sensor to make sure it isn t...

Страница 21: ...es with the Y signal through the circuit board The 60 psig low pressure switch is connected in series with the Y signal to the processor only This will allow the control to monitor the low pressure sw...

Страница 22: ...L HP1 BK BL R FL PR W R 24 VAC LTC OPTIONAL SEN 1 SEN 2 SENSOR 1 SENSOR 2 3 R TB3 4 CCM1 CR2 1 3 BK LPS Y HPS T1 T C R X P10 P11 P12 10 SEC 5 MIN P7 P8 P9 3 SEC 6 SEC P5 P4 P3 P2 P1 300 180 120 90 LPS...

Страница 23: ...4 6 CR1 4 6 PR PR PR PR TS C TS H 23 63 34 64 52 CHR 1 3 WHEN USED 21 20 BR BR WHEN REQ D SPLICE 12 CHR 4 2 WHEN REQ D SPLICE BR CLASS 2 60 HZ TR1 24V WHEN USED R R R O C O 16 TB1 TB2 A1 A2 24 COM TC...

Страница 24: ...30 VOLTS AC MAXIMUM EXTERNAL LOAD CHARACTERISTICS MUST NOT EXCEED 10 AMPS MAKE 1 AMP BREAK MAINTAIN SEPARATION BETWEEN CLASS 2 CIRCUITS OF DIFFERENT SOURCES PROVIDE DISCONNECTING MEANS EQUIPMENT GROU...

Страница 25: ...drops below 20 F The control will re energize the output relays when the sensor temperature rises above 22 5 F Additionally the control will monitor each individual sensor to make sure it isn t broken...

Страница 26: ...nnected in series with the Y signal to the processor only This will allow the control to monitor the low pressure switch status and initi ate the bypass delay If the 60 psig low pressure switch should...

Страница 27: ...W R 24 VAC LTC OPTIONAL SEN 1 SEN 2 SENSOR 1 SENSOR 2 3 R TB3 4 CCM1 CR2 1 3 BK LPS Y HPS T1 T C R X P10 P11 P12 10 SEC 5 MIN P7 P8 P9 3 SEC 6 SEC P5 P4 P3 P2 P1 300 180 120 90 LPS BYPASS SECONDS DOM...

Страница 28: ...64 52 CHR 1 3 11 WHEN USED 19 18 BR BR WHEN REQ D SPLICE 10 CHR 4 2 WHEN REQ D SPLICE BR 96 VA CLASS 2 60 HZ TR1 24V WHEN USED R R R O C Y O 14 TB1 TB2 A1 A2 OPTIONAL 208 230V 4 0A 24 COM TC OPTIONAL...

Страница 29: ...WITH THE COMPRESSORS AN EXTERNAL LOAD POWERED BY TRANSFORMER TR1 IN THE WW UNIT MUST NOT EXCEED 12 VA SEALED 96 VA INRUSH 24 VOLTS AC EXTERNAL LOADS POWERED FROM AN EXTERNAL SOURCE ARE LIMITED TO CLAS...

Страница 30: ...elow 20 F The control will re energize the output relays when the sensor temperature rises above 22 5 F Additionally the control will monitor each individual sensor to make sure it isn t broken or sho...

Страница 31: ...n series with the Y signal to the processor only This will allow the control to monitor the low pressure switch status and initi ate the bypass delay If the 60 psig low pressure switch should open the...

Страница 32: ...S R Y PR O OPTIONAL OPTIONAL 5 CC1 Y W OPTIONAL HP1 BK BL BK R FL PR W R 24 VAC LTC OPTIONAL SEN 1 SEN 2 SENSOR 1 SENSOR 2 3 R TB3 4 CCM1 CR2 1 3 BK LPS Y HPS T1 T C R X P10 P11 P12 10 SEC 5 MIN P7 P8...

Страница 33: ...BK BK CR2 4 6 CR1 4 6 PR PR PR PR TS C TS H 23 63 34 64 52 CHR 1 3 11 WHEN USED 19 18 BR BR WHEN REQ D SPLICE 10 CHR 4 2 WHEN REQ D SPLICE BR CLASS 2 60 HZ TR1 24V WHEN USED R R R O C O 14 TB1 TB2 A1...

Страница 34: ...COMPRESSORS AN EXTERNAL LOAD POWERED BY TRANSFORMER TR1 IN THE WW UNIT MUST NOT EXCEED 12 VA SEALED 96 VA INRUSH 24 VOLTS AC EXTERNAL LOADS POWERED FROM AN EXTERNAL SOURCE ARE LIMITED TO CLASS 2 CIRCU...

Страница 35: ...below 20 F The control will re energize the output relays when the sensor temperature rises above 22 5 F Additionally the control will monitor each individual sensor to make sure it isn t broken or s...

Страница 36: ...d in series with the Y signal to the processor only This will allow the control to monitor the low pressure switch status and initi ate the bypass delay If the 60 psig low pressure switch should open...

Страница 37: ...IM 1072 1 Water to Water Source Heat Pumps Page 37 of 44 WHA Circuit Diagram WHA Load Coil Heater Condenser Source Coil Evaporator...

Страница 38: ...Page 38 of 44 Water to Water Source Heat Pumps IM 1072 1 WRA Circuit Diagram WRA Reverse Cycle No Domestic Hot Water WRA Reverse Cycle With Domestic Hot Water H R Coil...

Страница 39: ...ter Source Heat Pumps Page 39 of 44 WCA Circuit Diagram WCA Load Coil Chiller Evaporator Source Coil Condenser No Domestic Hot Water WCA Load Coil Chiller Evaporator Source Coil Condenser With Domesti...

Страница 40: ...erage____________________ Phase____________________ Transformer Volts__________________ Unit Function Heating WRA WHA Entering Leaving Diff TD Load Liquid Temperature F From fan coil unit radiant coil...

Страница 41: ...tor points etc won t start 3 Compressor starts but a Run capacitor could be bad a Check capacitor hums and trips out on overload b Voltage may be low b Check it c Seized bearings on compressor c Repla...

Страница 42: ...tch HP 7 Low Pressure 844 151 844 151 844 151 844 151 844 151 844 151 844 151 844 151 844 151 844 151 844 151 Switch LP1 8 Fluid Refrigerant 512 200 512 201 512 201 512 259 512 201 512 202 512 200 512...

Страница 43: ...This page intentionally left blank...

Страница 44: ...rsuant to its standard terms and conditions of sale including Limited Product Warranty Consult your local Daikin Representative for warranty details Refer to Form 933 430285Y To find your local Daikin...

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