York WW-15 Installation Manual Download Page 3

Page: 3 / 68

175244-BIM-A-0706

Unitary Products Group

LIST OF FIGURES

Fig. #

Pg. #

TYPICAL RIGGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

CENTER OF GRAVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

FIXED OUTDOOR AIR DAMPER . . . . . . . . . . . . . . . . . . . 11

RECOMMENDED DRAIN PIPING . . . . . . . . . . . . . . . . . . 11

TYPICAL FIELD WIRING . . . . . . . . . . . . . . . . . . . . . . . . . 12

EXTERNAL SUPPLY CONNECTION EXTERNAL
SHUT-OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

BOTTOM SUPPLY CONNECTION EXTERNAL
SHUT-OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

VENT AND COMBUSTION AIR HOOD . . . . . . . . . . . . . . 16

ENTHALPY SETPOINT ADJUSTMENT . . . . . . . . . . . . . . 18

HONEYWELL ECONOMIZER CONTROL W7212 . . . . . . 18

FOUR AND SIX POINT LOADS . . . . . . . . . . . . . . . . . . . . 20

CENTER OF GRAVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DIMENSIONS 15, 20 & 25 TON . . . . . . . . . . . . . . . . . . . . 32

REAR VIEW DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . 33

UNIT CLEARANCES AND RAIN HOOD DIMENSIONS
(15, 20 & 25 TON) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

ALTITUDE/TEMPERATURE CONVERSION FACTOR . . 36

CHARGING CHART - WW-15 . . . . . . . . . . . . . . . . . . . . . . 44

CHARGING CHART - WW-20 . . . . . . . . . . . . . . . . . . . . . . 44

CHARGING CHART - WW-25 . . . . . . . . . . . . . . . . . . . . . . 45

BELT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

PRESSURE DROP ACROSS A DRY INDOOR COIL VS
SUPPLY AIR CFM FOR ALL UNIT TONNAGES . . . . . . . 46

GAS VALVE PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

GAS VALVE AND CONTROLS . . . . . . . . . . . . . . . . . . . . . 53

TYPICAL GAS VALVES . . . . . . . . . . . . . . . . . . . . . . . . . . 55

PROPER FLAME ADJUSTMENT . . . . . . . . . . . . . . . . . . . 55

TYPICAL FLAME APPEARANCE . . . . . . . . . . . . . . . . . . . 55

UNIT CONTROL BOARD . . . . . . . . . . . . . . . . . . . . . . . . . 65

LIST OF TABLES

Tbl. #

Pg. #

UNIT APPLICATION DATA . . . . . . . . . . . . . . . . . . . . . . . . . 8

CONTROL WIRE SIZES . . . . . . . . . . . . . . . . . . . . . . . . . . 13

ELECTRIC HEAT APPLICATION DATA . . . . . . . . . . . . . . 13

GAS HEAT APPLICATION DATA . . . . . . . . . . . . . . . . . . . 14

PIPE SIZING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

FOUR AND SIX POINT LOADS . . . . . . . . . . . . . . . . . . . . 20

PHYSICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

WW ELECTRICAL DATA W/O POWERED CONVENIENCE
OUTLET - STD DRIVE MOTOR . . . . . . . . . . . . . . . . . . . . 22

WW ELECTRICAL DATA W/O POWERED CONVENIENCE
OUTLET - HIGH STATIC DRIVE MOTOR . . . . . . . . . . . . 24

WW ELECTRICAL DATA W/O POWERED CONVENIENCE
OUTLET - LOW AIRFLOW DRIVE . . . . . . . . . . . . . . . . . . 26

WW ELECTRICAL DATA W/POWERED CONVENIENCE
OUTLET - STD DRIVE MOTOR . . . . . . . . . . . . . . . . . . . . 27

WW ELECTRICAL DATA W/POWERED CONVENIENCE
OUTLET - HIGH STATIC DRIVE MOTOR . . . . . . . . . . . . 29

WW ELECTRICAL DATA W/POWERED CONVENIENCE
OUTLET - LOW AIRFLOW DRIVE . . . . . . . . . . . . . . . . . . 31

ALTITUDE CORRECTION FACTORS . . . . . . . . . . . . . . . 35

WW-15 BLOWER PERFORMANCE - STANDARD DRIVE
(COOLING ONLY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

WW-15 BLOWER PERFORMANCE - STANDARD DRIVE
(GAS HEAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

WW-15 BLOWER PERFORMANCE - HIGH STATIC DRIVE
(COOLING ONLY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

WW-15 BLOWER PERFORMANCE - HIGH STATIC DRIVE
(GAS HEAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

WW-20 BLOWER PERFORMANCE - STANDARD DRIVE
(COOLING ONLY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

WW-20 BLOWER PERFORMANCE - STANDARD DRIVE
(GAS HEAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

WW-20 BLOWER PERFORMANCE - HIGH STATIC DRIVE
(COOLING ONLY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

WW-20 BLOWER PERFORMANCE - HIGH STATIC DRIVE
(GAS HEAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

WW-25 BLOWER PERFORMANCE - STANDARD DRIVE
(COOLING ONLY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

WW-25 BLOWER PERFORMANCE - STANDARD DRIVE
(GAS HEAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

WW-25 BLOWER PERFORMANCE - HIGH STATIC DRIVE
(COOLING ONLY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

WW-25 BLOWER PERFORMANCE - HIGH STATIC DRIVE
(GAS HEAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

STATIC RESISTANCES . . . . . . . . . . . . . . . . . . . . . . . . . . 43

POWER EXHAUST PERFORMANCE . . . . . . . . . . . . . . . 43

BLOWER MOTOR AND DRIVE DATA . . . . . . . . . . . . . . . 43

LIMIT CONTROL SETTING . . . . . . . . . . . . . . . . . . . . . . . 50

ELECTRIC HEAT ANTICIPATOR SETPOINTS . . . . . . . . 51

LIMIT CONTROL SETTING . . . . . . . . . . . . . . . . . . . . . . . 53

GAS HEAT ANTICIPATOR SETPOINTS . . . . . . . . . . . . . 53

GAS RATE - CUBIC FEET PER HOUR . . . . . . . . . . . . . . 56

UNIT CONTROL BOARD FLASH CODES . . . . . . . . . . . . 64

Summary of Contents for WW-15

Page 1: ...NSTALLATION 7 OPERATION 46 START UP COOLING 53 START UP GAS HEAT 54 TROUBLESHOOTING 56 See the following page for a complete Table of Contents NOTES CAUTIONS AND WARNINGS The installer should pay part...

Page 2: ...CE OF OPERATION 47 CONTINUOUS BLOWER 47 INTERMITTENT BLOWER 47 NO OUTDOOR AIR OPTIONS 47 ECONOMIZER WITH SINGLE ENTHALPY SENSOR 47 ECONOMIZER WITH DUAL ENTHALPY SENSORS 48 ECONOMIZER SINGLE OR DUAL WI...

Page 3: ...STD DRIVE MOTOR 22 9 WW ELECTRICAL DATA W O POWERED CONVENIENCE OUTLET HIGH STATIC DRIVE MOTOR 24 10 WW ELECTRICAL DATA W O POWERED CONVENIENCE OUTLET LOW AIRFLOW DRIVE 26 11 WW ELECTRICAL DATA W POWE...

Page 4: ...d install repair main tain or service this equipment Observe all precautions in the literature on labels and tags accompanying the equipment whenever working on air conditioning equipment Be sure to f...

Page 5: ...attention to the words NOTE CAUTION and WARNING Notes are intended to clarify or make the installation easier Cau tions are given to prevent equipment damage Warn ings are given to alert installer th...

Page 6: ...DFS APS Novar Controller DFS APS Simplicity IntelliComfort Controller Simplicity IntelliComfort Controller w ModLinc 2 Pleated filters 4 Pleated filters BAS Ready Unit with Belimo Economizer Double W...

Page 7: ...n accordance with the following national and local safety codes In U S A National Electrical Code ANSI NFPA No 70 National Fuel Gas Code Z223 1 Gas Fired Central Furnace Standard ANSI Z21 47a Local ga...

Page 8: ...led on a roof curb or special frame other than a UPG roof curb gasketing must be applied to all surfaces that come in contact with the unit under side TABLE 1 UNIT APPLICATION DATA UNIT MODEL NUMBER W...

Page 9: ...tion and ventilation air in accordance with Section 5 3 Air for Combustion and Ventilation of the National Fuel Gas Code ANSI Z223 1 in U S A or Sections 7 2 7 3 or 7 4 of Gas Installation Codes CSA B...

Page 10: ...surfaces on the hood prior to installing the hood Extend gasketing 1 4 inch beyond the top and bottom of the two side flanges to insure adequate sealing Adjusting the damper to the desired air flow ma...

Page 11: ...r coil and must be kept clean or replaced with same size and type Dirty filters will reduce the capacity of the unit and will result in frosted coils or safety shutdown Minimum filter area and require...

Page 12: ...o s ta t 2 E T 0 7 7 0 0 1 0 0 2 4 i n c l u d e s s u b b a s e 2 T e r m i n a l s A 1 a n d A 2 p r o v i d e a r e l a y o u tp u t to c l o s e th e o u td o o r e c o n o m i z e r d a m p e r s...

Page 13: ...type shown on the wiring diagram and the same minimum gauge as the replaced wire Electrical line must be sized properly to carry the load Use copper conductors only Each unit must be wired with a sep...

Page 14: ...iping arrangements are shown in the figures on page 15 All shaded items are field sup plied If gas supply line is routed through the unit s base ensure that the burner assembly can be removed for main...

Page 15: ...as supply connection to the fur nace L P UNITS TANKS AND PIPING All gas heat units are shipped from the factory equipped for natural gas use only The unit may be converted in the field for use with L...

Page 16: ...secured to the inside of the access panel opening with four fasteners and the screws used for mounting the hood to the panel The top flange of this hood slips in under the top of the access panel open...

Page 17: ...OR WITH OUT POWER EXHAUST With no power exhaust option adjust the Exhaust Air Adjustment Screw fully clockwise This will allow 2nd stage cooling to operate With power exhaust option each building pre...

Page 18: ...C C B B A A CONTROL CURVE CONTROL POINT APPROX 0 F 0 C AT 50 RH A D C B 63 17 73 23 70 21 67 19 FIGURE 10 HONEYWELL ECONOMIZER CONTROL W7212 N1 N P1 P EXH Set EXH Min Pos IAQ Max IAQ IAQ Min Free Coo...

Page 19: ...ee If the coil has lost its holding charge the reclaim coil must be leak tested and any necessary repairs made before proceeding The temperature required to make or break a brazed joint is sufficient...

Page 20: ...7 WW 25 Gas 3180 554 1036 1036 554 WW 15 Elec 2580 440 822 859 460 WW 20 Elec 2880 502 938 938 502 WW 25 Elec 2980 519 971 971 519 Unit Size Total Shipping Weight 6 Point Loads lbs A B C D E F WW 15 G...

Page 21: ...PER INCH 14 FACE AREA Sq Ft 17 2 COMPRESSOR QTY PER UNIT SCROLL 2 FILTERS QUANTITY PER UNIT 16 X 25 X 2 4 QUANTITY PER UNIT 16 X 20 X 2 4 TOTAL FACE AREA Sq Ft 20 CHARGE REFRIGERANT 22 Lb Oz SYSTEM No...

Page 22: ...00 1 2 8 2 0 0 None 0 0 37 5 45 E18 18 0 1 21 7 37 5 45 E36 36 0 2 43 3 64 4 70 E54 54 0 2 65 0 75 2 90 E72 72 0 2 86 6 96 9 110 575 8 3 78 0 9 6 6 0 0 None 0 0 28 9 35 E18 18 0 1 17 3 29 9 35 E36 36...

Page 23: ...3 245 2 4 38 6 0 0 None 143 4 175 E18 18 0 1 43 3 143 4 175 E36 36 0 2 86 6 156 5 175 E54 54 0 2 129 9 178 2 200 E72 72 0 2 173 2 221 5 250 460 17 6 125 0 9 19 3 0 0 None 62 9 80 E18 18 0 1 21 7 62 9...

Page 24: ...10 9 100 1 2 10 0 0 0 None 0 0 39 3 50 E18 18 0 1 21 7 39 6 50 E36 36 0 2 43 3 66 6 70 E54 54 0 2 65 0 77 5 90 E72 72 0 2 86 6 99 1 110 575 8 3 78 0 9 7 5 0 0 None 0 0 29 8 35 E18 18 0 1 17 3 31 0 35...

Page 25: ...30 42 3 245 2 4 38 6 0 0 None 143 4 175 E18 18 0 1 43 3 143 4 175 E36 36 0 2 86 6 156 5 175 E54 54 0 2 129 9 178 2 200 E72 72 0 2 173 2 221 5 250 460 17 6 125 0 9 19 3 0 0 None 62 9 80 E18 18 0 1 21 7...

Page 26: ...0 6 7 5 0 0 None 0 0 37 1 45 E18 18 0 1 17 3 37 1 45 E36 36 0 2 34 6 52 7 60 E54 54 0 2 52 0 61 3 70 E72 72 0 2 69 3 78 7 90 25 25 208 42 3 245 2 4 20 0 0 0 None 0 0 124 8 150 E18 13 5 1 37 5 124 8 15...

Page 27: ...100 1 1 8 2 5 0 None 0 0 42 5 50 E18 18 0 1 21 7 43 6 50 E36 36 0 2 43 3 70 6 80 E54 54 0 2 65 0 81 5 90 E72 72 0 2 86 6 103 1 110 575 8 3 78 0 9 6 6 4 0 None 0 0 32 9 40 E18 18 0 1 17 3 34 9 40 E36 3...

Page 28: ...3 245 2 4 38 6 10 0 None 153 4 175 E18 18 0 1 43 3 153 4 175 E36 36 0 2 86 6 169 0 175 E54 54 0 2 129 9 190 7 225 E72 72 0 2 173 2 234 0 250 460 17 6 125 0 9 19 3 5 0 None 67 9 80 E18 18 0 1 21 7 67 9...

Page 29: ...0 9 100 1 2 10 0 5 0 None 0 0 44 3 50 E18 18 0 1 21 7 45 8 50 E36 36 0 2 43 3 72 9 80 E54 54 0 2 65 0 83 7 90 E72 72 0 2 86 6 105 4 110 575 8 3 78 0 9 7 5 4 0 None 0 0 33 8 40 E18 18 0 1 17 3 36 0 40...

Page 30: ...0 42 3 245 2 4 38 6 10 0 None 153 4 175 E18 18 0 1 43 3 153 4 175 E36 36 0 2 86 6 169 0 175 E54 54 0 2 129 9 190 7 225 E72 72 0 2 173 2 234 0 250 460 17 6 125 0 9 19 3 5 0 None 67 9 80 E18 18 0 1 21 7...

Page 31: ...0 6 7 5 4 0 None 0 0 41 1 50 E18 18 0 1 17 3 41 1 50 E36 36 0 2 34 6 57 7 60 E54 54 0 2 52 0 66 3 70 E72 72 0 2 69 3 83 7 90 25 25 208 42 3 245 2 4 20 0 10 0 None 0 0 134 8 175 E18 13 5 1 37 5 134 8...

Page 32: ...PHQVLRQV DUH LQ LQFKHV 7KH DUH VXEMHFW WR FKDQJH ZLWKRXW QRWLFH HUWLILHG GLPHQVLRQV ZLOO EH SURYLGHG XSRQ UHTXHVW 32 5 5 1 175 6 25 75 7 66 27 3 8 RU SUHVVXUH GURS UHDGLQJ 2 5 203 570 17 5 0 2 211 7 2...

Page 33: ...xhaust option The covering consists of a heavy black paper composition 3 Replace the side supply and return air compartment panels For side duct applications 1 Replace the side panels on the supply an...

Page 34: ...CES LOCATION CLEARANCE Front 36 Rear 24 Less Economizer 49 With Economizer Left Side Filter Access 24 Less Economizer 36 With Economizer 3 Right Side Cond Coil 36 Below Unit1 1 Units may be installed...

Page 35: ...tatic pressure and BHP Since no temperature data is given we will assume an air temperature of 70 F Table 14 shows the correction factor to be 0 832 Corrected static pressure 1 5 x 0 832 1 248 IWC Cor...

Page 36: ...175244 BIM A 0706 36 Unitary Products Group FIGURE 16 ALTITUDE TEMPERATURE CONVERSION FACTOR OWLWXGH 7HPSHUDWXUH RQYHUVLRQ DFWRU 7 03 5 785 255 7 21 725 6 9 IW...

Page 37: ...530 3 0 530 3 0 530 3 7RQ ORZHU 3HUIRUPDQFH RUL RQWDO LVFKDUJH 7XUQ 7XUQV 7XUQV 7XUQV 7XUQV 7XUQV 7RQ 6WDQGDUG ULYH RROLQJ 2QO 93 WHUQDO 6WDWLF 0 6 7XUQ 7XUQV 7XUQV 7XUQV 7XUQV 7XUQV 63 0 530 3 0 530...

Page 38: ...530 3 3 PRWRU 3 PRWRU 7RQ ORZHU 3HUIRUPDQFH RUL RQWDO LVFKDUJH 7XUQ 7XUQV 7XUQV 7XUQV 7XUQV 7XUQV 7RQ LJK 6WDWLF ULYH RROLQJ 2QO 93 WHUQDO 6WDWLF 0 6 7XUQ 7XUQV 7XUQV 7XUQV 7XUQV 7XUQV 63 0 530 3 0 53...

Page 39: ...PRWRU 3 PRWRU 7XUQ 7XUQV 7XUQV 7XUQV 7XUQV 7XUQV 7RQ ORZHU 3HUIRUPDQFH RUL RQWDO LVFKDUJH 7RQ 6WDQGDUG ULYH RROLQJ 2QO 93 WHUQDO 6WDWLF 3UHVVXUH 0 6 WXUQ WXUQV WXUQV WXUQV WXUQV WXUQV 63 0 530 3 0 530...

Page 40: ...3 PRWRU 3 PRWRU 3 PRWRU 7RQ ORZHU 3HUIRUPDQFH RUL RQWDO LVFKDUJH 7XUQV 7XUQ 7XUQV 7XUQV 7XUQV 7XUQV 7RQ LJK 6WDWLF ULYH RROLQJ 2QO 93 WHUQDO 6WDWLF 0 6 7XUQ 7XUQV 7XUQV 7XUQV 7XUQV 7XUQV 63 0 530 3 0...

Page 41: ...530 3 3 0RWRU 3 0RWRU 3 0RWRU 7XUQ 7XUQV 7XUQV 7RQ ORZHU 3HUIRUPDQFH RUL RQWDO LVFKDUJH 7XUQV 7XUQV 7XUQV 7RQ 6WDQGDUG ULYH 93 9 WHUQDO 6WDWLF 0 6 7XUQ 7XUQV 7XUQV 7XUQV 7XUQV 7XUQV 63 0 530 3 0 530 3...

Page 42: ...530 3 3 0RWRU 3 0RWRU 3 0RWRU 7RQ ORZHU 3HUIRUPDQFH RUL RQWDO LVFKDUJH 7XUQV 7XUQV 7XUQV 7XUQ 7XUQV 7XUQV 7RQ LJK 6WDWLF ULYH 93 9 WHUQDO 6WDWLF 0 6 7XUQ 7XUQV 7XUQV 7XUQV 7XUQV 7XUQV 63 0 530 3 0 53...

Page 43: ...78 TABLE 29 BLOWER MOTOR AND DRIVE DATA MODEL SIZE DRIVE BLOWER RANGE RPM MOTOR1 ADJUSTABLE MOTOR PULLEY FIXED BLOWER PULLEY BELT NOTCHED HP FRAME EFF DESIG NATION OUTSIDE DIA IN PITCH DIA IN BORE IN...

Page 44: ...TXV s left to the factory setting If the TXV s have been adjusted in the field the charging chart may no longer apply 75 65 FIGURE 18 CHARGING CHART WW 20 20 Ton Charging Chart 140 160 180 200 220 240...

Page 45: ...ng the supply air blower to produce higher CFM s and or higher static pressures Use Model 1LD0460 for 15 ton units Model 1LD0417 for 17 5 and 20 ton units and Model 1LD0435 for 25 ton units Refer to t...

Page 46: ...pressure drop across a wet coil under field conditions would be inaccurate To assure a dry coil the compressors should be deac tivated while the test is being run 4 Knowing the pressure drop across a...

Page 47: ...cooling the UCB will delay energizing compressor 2 by 30 sec onds in order to avoid a power in rush Once the thermostat has been satisfied it will de ener gize Y1 and Y2 If the compressors have satis...

Page 48: ...conclu sion of the ASCD the UCB will re energize the halted compressor Should a high pressure switch open three times within two hours of operation the UCB will lock out the asso ciated compressor and...

Page 49: ...ell The unit control board monitors the temperature limit switch of electric heat units and the temperature limit switch and the gas valve of gas furnace units COMPRESSOR PROTECTION The compressors al...

Page 50: ...inadequate supply air flow occurs thus shutting down the heater and energizing the blower 2 Temperature Limit Switch TLS 3 4 5 and 6 This control is located inside the heater compart ment and is set...

Page 51: ...completed thru the UCB Heat relay RW2 is ener gized The RW2 1 contact is closed energizing the second stage ignition module IC2 IC2 will immedi ately start the second stage igniter sparking and will o...

Page 52: ...includes the following safety con trols 1 Limit Control LS This control is located inside the heat exchanger compartment and is set to open at the temperature indicated in the Limit Control Setting Ta...

Page 53: ...Check the electrical supply voltage being supplied Be sure that it is the same as listed on the unit nameplate 2 Set the room thermostat to the off position 3 Turn unit electrical power on 4 Set the...

Page 54: ...burners will ignite TO SHUT DOWN 1 Turn off electric power to unit 2 Depress knob of gas valve while turning to off position or turn gas valve switch to off position POST START CHECK LIST GAS After t...

Page 55: ...ange burners pilot or orifices CLOSE MAIN MANUAL SHUT OFF VALVE AND SHUT OFF ALL ELECTRIC POWER TO THE UNIT 1 Remove the screws holding either end of the mani fold to the burner supports 2 Open the un...

Page 56: ...plate and the data in the Gas Heat Application Table 4 After the temperature rise has been determined the cfm can be calculated as follows After about 20 minutes of operation determine the fur nace t...

Page 57: ...ring operation calls b proper wiring between the room thermostat and the UCB and c loose wiring from the room thermostat to the UCB 9 If 24 volts is present at the room thermostat but not at the UCB c...

Page 58: ...s at the Y1 ECON terminal If 24 volts is not present check for loose wiring from the Y1 OUT terminal to the Mate N Lock plug the jumper in the Mate N Lock plug and in the wiring from the Mate N Lock p...

Page 59: ...minals e g if LPS2 has opened there will be 24 volts of potential between the LPS2 terminals 9 If 24 volts is present at the UCB Y2 terminal and none of the protection switches have opened the UCB may...

Page 60: ...ld be flashing a code If not press and release the ALARMS button on the UCB The UCB will flash the last five alarms on the LED If the compressor is locked out remove any call for cooling This will res...

Page 61: ...d in Check for loose wiring between the contactor and the sup ply air blower motor 3 If M3 is pulled in and voltage is supplied at M3 lightly touch the supply air blower motor housing If it is hot the...

Page 62: ...se 24 volt connection back to the relay board and check the connections from the room thermo stat to the relay board If all connections are cor rect replace the relay board The draft motor runs but th...

Page 63: ...essure as described in POST START CHECK LIST page 54 Make adjustments as necessary 3 Make sure that the pilot burner is not bent or dam aged 4 Make sure that the ground connections at the pilot burner...

Page 64: ...his is a Control Failure 1 Flash Not Applicable 2 Flashes Control waiting ASCD1 1 Non alarm condition Flashing Off Off On Off 3 Flashes HPS1 Compressor Lockout Off Off Off On On 4 Flashes HPS2 Compres...

Page 65: ...175244 BIM A 0706 Unitary Products Group 65 FIGURE 27 UNIT CONTROL BOARD Check Alarm History Reset All ASCDs for One Cycle Non Alarm Condition Green LED Flashing Current Alarm Flashed Red LED...

Page 66: ...175244 BIM A 0706 66 Unitary Products Group...

Page 67: ...175244 BIM A 0706 Unitary Products Group 67...

Page 68: ...t to change without notice Printed in U S A 175244 BIM A 0706 Copyright 2006 by Unitary Products Group All rights reserved Supersedes 128567 BIM A 0705 Unitary 5005 Norman Products York OK Group Drive...

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