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Johnson Controls J ZT Series, Installation Manual

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Johnson Controls J ZT Series Installation Manual Download Page 13

5370597-JIM-D-1019

Johnson Controls Ducted Systems

13

Figure 11: JA3 thru JA5ZT Unit Left Duct Opening

Figure 12: JA3 thru JA5ZT Roof Curb

4-5/16

A

Table 7: Left/End Duct Dimensions

Unit Model Number

Dimension (in.)

A

B

C

JA3ZT

30.357

13.365

22.516

JA4ZT

30.357

13.365

22.516

JA5ZT

30.357

13.365

22.516

8 or 14

50-1/2

30

20

20

80-5/8

6

2 TYP.

INSULATED DECK UNDER

COMPRESSOR SECTION

INSULATED DECK UNDER

CONDENSER SECTION

FRONT

RIGHT

SUPPLY

RETURN

Summary of Contents for J ZT Series

Page 1: ...5 16 Return Downflow Plenum With Panel 15 17 Discharge Panel In Place 15 18 Save Side Panels For Economizer Hood Tops 15 19 Condensate Drain 16 20 Field Wiring Disconnect 18 21 Typical Control Wiring 19 22 Side Entry Gas Piping 26 23 Bottom Entry Gas Piping 26 24 Simplified VFD Wiring 29 25 SE ECO1001 0 Economizer Controller 32 26 Belt Adjustment 36 27 Altitude Temperature Correction Factors 37 28...

Page 2: ... latest edition Wear safety glasses and work gloves Use quenching cloth and have a fire extinguisher available during brazing operations Improper installation may create a condition where the operation of the product could cause personal injury or property damage Improper installation adjustment alteration service or maintenance can cause injury or property damage Refer to this manual for assistan...

Page 3: ...installed directly on combustible flooring or in the U S on wood flooring or Class A Class B or Class C roof covering materials 4 For use with natural gas convertible to LP with kit This product must be installed in strict compliance with the enclosed installation instructions and any applicable local state and national codes including but not limited to building electrical and mechanical codes Th...

Page 4: ...nomizer w Power EXH H Motorized Damper Outdoor Air Option 1 No Service Options 2 DSC Disconnect Switch 3 NCO Non PWR Conv Outlet 4 PCO Powered Conv Outlet 5 DSC NCO 6 DSC PCO A No Sensors B PHM Phase Monitor C DFS Dirty Filter Switch D SSD Supply Air Smoke DET E RSD Return Air Smoke DET F PHM DFS G PHM SSD H PHM RSD J DFS SSD K DFS RSD L SSD RSD M PHM DFS SSD N PHM DFS RSD P PHM SSD RSD Q DFS SSD ...

Page 5: ...must be operated under thermostatic control Return and supply air ducts must be sealed to the unit Air filters in place Unit furnace input rate and temperature rise must be set per rating plate marking Return air temperature maintained between 55ºF 13ºC and 80ºF 27ºC Upon completion of the construction phase and prior to formal start up and commissioning the unit duct work and components should be...

Page 6: ...djusted to obtain a temperature rise within the range specified on the unit rating plate If components are to be added to a unit to meet local codes they are to be installed at the dealer s and or customer s expense Size of unit for proposed installation should be based on heat loss heat gain calculation made according to the methods of Air Conditioning Contractors of America ACCA This furnace is ...

Page 7: ...lter options Filter drier solid core Slide out motor and blower assembly for easy adjustment and service Base rails w forklift slots three sides and lifting holes Toolless door latch Side entry power and control wiring knockouts Premium Efficiency Belt drive blower motor Power ventor motor 20 gauge aluminized steel tubular heat exchanger for long life stainless steel option Two stage gas heating t...

Page 8: ...Excessive exposure of this furnace to contaminated combustion air may result in equipment damage or personal injury Typical contaminates include permanent wave solution chlorinated waxes and cleaners chlorine based swimming pool chemicals water softening chemicals carbon tetrachloride Halogen type refrigerants cleaning solvents e g perchloroethylene printing inks paint removers varnishes hydrochlo...

Page 9: ...rating Economizer 90 85 Power Exhaust 40 35 Electric Heat1 49 49 Gas Heat2 110 110 1 Weight given is for the maximum heater size available 24KW 2 Weight given is for the maximum number of tube heat exchangers available 8 tube LEFT A 59 00 C D E F 4 19 27 31 89 00 21 19 11 38 15 38 59 00 15 38 29 69 15 25 FRONT SEE DETAIL B FOR DRAIN LOCATION SEE DETAIL A FOR GAS INLET B 2X Ø 24 38 ...

Page 10: ... 16 15 3 16 6 3 16 42 CABINET Ø 3 126 Ø 2 000 3 184 4 727 7 705 14 594 Gas Pipe Inlet Gas Exhaust Vent 5 3 8 1 FPT Table 5 JA3 thru JA5ZT Unit Clearances Direction Distance in Direction Distance in Top1 1 Units must be installed outdoors Over hanging structure or shrubs should not obscure condenser air discharge outlet 72 Right 12 Front 36 Left 36 Rear 36 Bottom2 2 Units may be installed on combus...

Page 11: ...nit Bottom Duct Openings Bottom condensate drain Bottom gas supply entry FRONT RETURN AIR SUPPLY AIR RIGHT LEFT 20 1 8 19 1 8 17 1 8 6 13 16 6 13 16 32 11 16 14 1 2 16 3 8 18 1 16 25 9 16 12 5 16 27 1 2 24 21 18 89 Ø 2 469 3X Ø 0 875 Bottom power control and convenience outlet wiring entry ...

Page 12: ... Cover Power Entry Ø 2 1 2 Control Entry Ø 7 8 Power Entry Ø 2 1 2 Convenience Outlet Cover Convenience Outlet Power Entry Ø 7 8 FRONT Dot Plugs 5 5 32 31 11 16 2 31 32 18 1 4 Return Air Supply Air A B C D Table 6 Side Duct Dimensions Unit Model Number Dimension in A B C D JA3ZT 27 3 4 12 1 16 27 1 2 16 JA4ZT 27 3 4 12 1 16 27 1 2 16 JA5ZT 27 3 4 12 1 16 27 1 2 16 ...

Page 13: ...u JA5ZT Roof Curb 4 5 16 A Table 7 Left End Duct Dimensions Unit Model Number Dimension in A B C JA3ZT 30 357 13 365 22 516 JA4ZT 30 357 13 365 22 516 JA5ZT 30 357 13 365 22 516 8 or 14 50 1 2 30 20 20 80 5 8 6 2 TYP INSULATED DECK UNDER COMPRESSOR SECTION INSULATED DECK UNDER CONDENSER SECTION FRONT RIGHT SUPPLY RETURN ...

Page 14: ... 8 94 50 1 2 30 1 2 64 1 4 59 1 4 10 23 4 26 80 5 8 2 TYP FRONT RIGHT SUPPLY RETURN 3 4 X 1 1 4 WIDE GASKETING FOR CURB FRAME AND ALL DUCT SUPPORT SURFACES 2 UNIT BASE WOOD NAILER 8 MIN ABOVE FINISHED ROOF CURB FRAME INSULATION UNIT BASE RAILS COUNTERFLASHING CAN T STRIP INSULATION AND ROOFING MATERIAL ROOF DECK AND SUPPORT STRUCTURE 14 3 56 3 75 ...

Page 15: ... duct connections are designed to be reused by securing each panel to its respective down flow opening But keep in mind that the supply panel is installed with the painted surface UP facing the heat exchanger while the return panel is installed with the painted surface DOWN facing the down flow duct opening The supply panel is secured with the bracket already in place from the factory and two scre...

Page 16: ...xposure of the oil to the atmosphere POE polyolester compressor lubricants are known to cause long term damage to some synthetic roofing materials Procedures which risk oil leakage include but are not limited to compressor replacement repairing refrigerant leaks replacing refrigerant components such as filter drier pressure switch metering device or coil Units are shipped with compressor mountings...

Page 17: ...ed replacement wire must be of the type shown on the wiring diagram and the same minimum gauge as the replaced wire A disconnect must be utilized for these units Factory installed disconnects are available If installing a disconnect field supplied or Johnson Controls supplied accessory refer to Figure 4 for the recommended mounting location NOTE Since not all local codes allow the mounting of a di...

Page 18: ...the unit nameplate Refer to Electrical Data Table 9 to size power wiring fuses and disconnect switch Power wiring is brought into the unit through the side of the unit or the basepan inside the curb Figure 20 Field Wiring Disconnect THREE PHASE POWER SUPPLY FACTORY OR FIELD SUPPLIED DISCONNECT GROUND LUG TERMINAL BLOCK TB1 ...

Page 19: ... BLOCK TERMINALS ON A LIMITED NUMBER OF THERMOSTATS 1 4 3 1 2 4 Second stage ŚĞĂƟŶŐ Ŷot required on single stage heĂƟŶg units Jumper is required if there is no Smoke Detector circuit Jumper is required for any coŵďŝŶĂƟŽŶ of R RC or RH 5 5 OCC is an output from the thermostat to indicate the Occupied ĐŽŶĚŝƟon X is an input to the thermostat to display Error Status condiƟons 3 W2 Y1 G OCC Y2 X R SD ...

Page 20: ...9 29 0 35 8 40 45 E15 11 3 2 31 4 44 6 51 5 45 60 E20 15 0 2 41 6 57 4 64 3 60 70 230 14 0 83 1 21 9 3 5 4 3 5 5 0 0 None 28 8 34 3 40 45 E06 6 0 1 14 4 28 8 34 3 40 45 E09 9 0 1 21 7 32 4 39 3 40 45 E15 15 0 2 36 1 50 5 57 4 60 60 E20 20 0 2 48 1 65 5 72 4 70 80 460 6 4 41 0 10 0 3 5 2 1 2 2 0 0 None 13 6 15 8 20 20 E06 6 0 1 7 2 13 6 15 8 20 20 E09 9 0 1 10 8 16 2 18 9 20 20 E15 15 0 2 18 0 25 2...

Page 21: ... 40 45 E15 11 3 2 31 4 44 6 51 5 45 60 E20 15 0 2 41 6 57 4 64 3 60 70 230 14 0 83 1 21 9 3 5 4 3 5 5 0 0 None 28 8 34 3 40 45 E06 6 0 1 14 4 28 8 34 3 40 45 E09 9 0 1 21 7 32 4 39 3 40 45 E15 15 0 2 36 1 50 5 57 4 60 60 E20 20 0 2 48 1 65 5 72 4 70 80 460 6 4 41 0 10 0 3 5 2 1 2 2 0 0 None 13 6 15 8 20 20 E06 6 0 1 7 2 13 6 15 8 20 20 E09 9 0 1 10 8 16 2 18 9 20 20 E15 15 0 2 18 0 25 2 27 9 30 30...

Page 22: ...50 50 E15 11 3 2 31 4 57 1 64 0 60 70 E20 15 0 2 41 6 69 9 76 8 70 80 230 14 0 83 1 21 9 3 5 4 3 5 5 10 0 None 38 8 44 3 50 50 E06 6 0 1 14 4 38 8 44 3 50 50 E09 9 0 1 21 7 44 9 51 8 50 60 E15 15 0 2 36 1 63 0 69 9 70 70 E20 20 0 2 48 1 78 0 84 9 80 90 460 6 4 41 0 10 0 3 5 2 1 2 2 5 0 None 18 6 20 8 25 25 E06 6 0 1 7 2 18 6 20 8 25 25 E09 9 0 1 10 8 22 4 25 2 25 30 E15 15 0 2 18 0 31 4 34 2 35 35...

Page 23: ...0 E15 11 3 2 31 4 57 1 64 0 60 70 E20 15 0 2 41 6 69 9 76 8 70 80 230 14 0 83 1 21 9 3 5 4 3 5 5 10 0 None 38 8 44 3 50 50 E06 6 0 1 14 4 38 8 44 3 50 50 E09 9 0 1 21 7 44 9 51 8 50 60 E15 15 0 2 36 1 63 0 69 9 70 70 E20 20 0 2 48 1 78 0 84 9 80 90 460 6 4 41 0 10 0 3 5 2 1 2 2 5 0 None 18 6 20 8 25 25 E06 6 0 1 7 2 18 6 20 8 25 25 E09 9 0 1 10 8 22 4 25 2 25 30 E15 15 0 2 18 0 31 4 34 2 35 35 E20...

Page 24: ...AFUE Steady state efficiency 81 5 81 81 81 5 81 81 81 81 80 5 No burners 4 4 6 4 4 6 4 6 8 No stages 21 22 22 21 22 22 22 22 22 Temperature Rise Range ºF 20 50 F 25 65 F 50 80 F 20 50 F 25 65 F 50 80 F 25 65 F 35 65 F 45 75 F Gas Limit Setting ºF 235 200 255 235 200 255 200 245 240 Gas piping connection in 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 DIMENSIONS inches Length 89 89 89 Width 59 59 59 Height ...

Page 25: ...irect ECM Direct ECM Direct ECM Quantity of motors 2 2 2 Motor HP each 1 3 1 3 1 3 No speeds Var Var Var RPM 850 850 850 Nominal total CFM 7000 7000 7000 BELT DRIVE EVAP FAN DATA Quantity 1 1 1 Fan Size Inch 12 x 9 12 x 9 12 x 9 Type Centrifugal Centrifugal Centrifugal Motor Sheave 1VL40 1VL40 1VL34 1VL44 1VL40 1VM50 Blower Sheave AK79 AK61 AK64 AK69 AK61 AK64 Belt A47 A45 A47 A47 A45 A47 Motor HP...

Page 26: ...r with locality The value should be checked with the local gas utility Figure 22 Side Entry Gas Piping Figure 23 Bottom Entry Gas Piping NOTE Maximum capacity of pipe in cubic feet of gas per hour based upon a pressure drop of 0 3 inch W C and 0 6 specific gravity gas NOTE There may be a local gas utility requirement specifying a minimum diameter for gas piping All units require a 3 4 inch pipe co...

Page 27: ...h accessory kit model numbers 1NP0454 or 1NP0455 All LP gas equipment must conform to the safety standards of the National Fire Protection Association Table 13 Gas Heat Minimum Supply Air Size Tons Model Heat Size Supply Air CFM Heating Min Max JA3 3 ZT N06 890 2220 N08 915 2370 N12 1130 1800 JA4 4 ZT N06 890 2220 N08 915 2370 N12 1290 2250 JA5 5 ZT N08 915 2370 N12 1380 2570 N16 1580 2630 Natural...

Page 28: ...ding to NFPA 72 requirements and cleaned at least once a year For specific troubleshooting and maintenance procedures please refer to the smoke detector s installation instructions which accompanies the unit Motorized Outdoor Damper The Motorized Outdoor Damper can be a factory installed option or a field installed accessory If factory installed refer to the instructions included with the outdoor ...

Page 29: ...eference signal fault signal All required drive parameters are pre programmed at the factory except in the case of 208 volt applications in which the parameter that defines motor nameplate voltage must be changed to a value of 208 00 and the parameter that defines motor rated current must be changed to the appropriate value appearing on the motor s nameplate Refer to the enclosed drive material fo...

Page 30: ...urn and outside air dry bulb dry bulb changeover Return and outside air dry bulb and outside air humidity single enthalpy Return and outside air dry bulb and return and outside air humidity dual enthalpy If either the return or outside air dry bulb sensors are unreliable free cooling is not available Free Cooling Operation When the control determines that the outside air is suitable the first stag...

Page 31: ... OFF f Econo Damper Position For Exh Fan ON Percent g Econo Damper Position For Exh Fan OFF Percent Inputs No inputs are present for non modulating power exhaust Outputs a 2 10 VDC from ECON on Economizer Expansion module b 24 VAC from EX FAN to energize exhaust fan on Economizer Expansion module Operation Operation details include a Compares economizer output to the Economizer Damper Position For...

Page 32: ...ermistor MAT parameter reports input status F C 3 65 VDC reading MAT to COM with open circuit Read only use in current control revision IN1 MAT LEDs at left on upper edge of economizer board POWER POWER Green UCB power indicator Lit indicates 24 VAC is present at 24V IN COM and HOT pins FAULT FAULT Red networking error and firmware error indicator 1 10th second on off flashing indicates a networki...

Page 33: ... power exhaust actuator and economizer actuator Connects through circuit trace to 24V IN pin HOT ECON 2 10 VDC output for the Economizer actuator Econ parameter reports output status 0 100 Used to position the economizer actuator for minimum position free cooling demand ventilation cooling economizer loading and purge functions COM 24 VAC common 0 10 VDC negative for economizer actuator Connects t...

Page 34: ...negative for the indoor air quality sensor Connects through circuit trace to 24V IN pin COM R 24V 24 VAC hot supplied for the outdoor air quality sensor Connects through circuit trace to 24V IN pin HOT IN6 OAQ 0 10 VDC positive input from the Outdoor Air Quality sensor OAQRange parameter sets the CO2 parts per million measured by the outdoor air quality sensor when it outputs 10 VDC OAQ parameter ...

Page 35: ...s drawing low amperage has similar suction and discharge pressures or producing a high noise level the scroll is misphased Blower Rotation Check for proper supply air blower rotation If the blower is rotating backwards the line voltage at the unit point of power connection is misphased See PHASING C COM 24 VAC common 0 5 VDC negative for the building pressure sensor Connects through circuit trace ...

Page 36: ...for adjusting belt tension 1 Loosen six nuts top and bottom A 2 Adjust by turning B 3 Never loosen nuts C 4 Use belt tension checker to apply a perpendicular force to one belt at the midpoint of the span as shown Deflection distance of 4mm 5 32 is obtained To determine the deflection distance from normal position use a straight edge from sheave to sheave as reference line The recommended deflectio...

Page 37: ...2 0 56 Example 2 A system located at 5 000 feet of elevation is to deliver 1 400 CFM at a static pressure of 1 5 Use the unit blower tables to select the blower speed and the BHP requirement Solution As in the example above no temperature information is given so 70 F is assumed The 1 5 static pressure given is at an elevation of 5 000 ft The first step is to convert this static pressure to equival...

Page 38: ...BHP exceeds the maximum continuous BHP rating of the 1 5 HP motor The 2 HP motor is required 6 1230 RPM is within the range of the 2 HP drives 7 Using the 2 HP motor and drive 5 turns open will achieve 1230 RPM Example Supply Air Blower Performance Air Flow CFM Available External Static Pressure IWG 0 2 0 4 0 6 0 8 1 0 1 2 1 4 1 6 1 8 2 0 RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM...

Page 39: ...40 729 0 46 815 0 54 888 0 63 965 0 72 1007 0 78 1088 0 87 1140 1 00 1198 1 06 1500 574 0 36 666 0 42 747 0 50 831 0 59 900 0 68 975 0 78 1019 0 83 1096 0 92 1151 1 06 1207 1 11 1600 596 0 39 689 0 44 766 0 54 847 0 63 912 0 73 983 0 84 1031 0 88 1103 0 97 1162 1 13 1217 1 18 1700 619 0 43 711 0 49 786 0 58 863 0 68 925 0 79 991 0 89 1043 0 94 1112 1 04 1172 1 19 1227 1 25 1800 643 0 47 734 0 54 8...

Page 40: ...1224 1 17 1400 586 0 37 680 0 46 769 0 55 852 0 65 930 0 74 1003 0 84 1070 0 93 1132 1 02 1189 1 12 1500 612 0 40 703 0 50 790 0 59 871 0 69 948 0 78 1019 0 88 1086 0 97 1148 1 07 1205 1 17 1600 643 0 44 731 0 53 814 0 63 893 0 73 967 0 82 1037 0 92 1103 1 01 1164 1 11 1221 1 21 1700 671 0 47 756 0 57 837 0 67 914 0 77 987 0 87 1056 0 97 1121 1 07 1183 1 17 1800 699 0 53 781 0 63 860 0 73 935 0 84...

Page 41: ... 5 1VL34 AK64 N A 576 631 688 747 800 859 H Static 1 5 1 5 1VL44 AK69 N A 792 844 892 944 996 1045 Field Supplied 1 5 1 5 1VL44 AK59 N A 915 989 1050 1113 1173 1238 JA5 5 ZT Field Supplied 1 5 1 5 1VL40 AK79 N A 609 656 703 746 792 839 Std 1 5 1 5 1VL40 AK61 N A 782 846 906 968 1022 1085 Field Supplied 2 2 1VL40 AK54 N A 896 960 1030 1090 1166 1238 H Static 2 2 1VM50 AK64 N A 1022 1079 1135 1190 1...

Page 42: ...not affect the static pressure readings 3 Use an Inclined Manometer or Magnehelic to determine the pressure drop across the unit This is the External Static Pressure ESP In order to obtain an accurate measurement be certain that the air filters are clean 4 Determine the number of turns the variable motor sheave is open 5 Select the correct blower performance table for the unit from Tables 17 and 1...

Page 43: ... blower speed can result in substantial changes in static pressure and BHP BHP and AMP draw of the blower motor will increase by the cube of the blower speed Static pressure will increase by the square of the blower speed Only qualified personnel should make blower speed changes strictly adhering to the fan laws Table 22 Motor Sheave Datum Diameters 1VL34x7 8 1 1 2 HP Motor 1VL44x7 8 1 1 2 HP Moto...

Page 44: ... Free Cooling SAT Lower Setpoint Any compressors that are energized will remain energized and the economizer dampers will be modulated to maintain supply air temperature to within 1 degree of the Cooling SAT Lower Setpoint If the output to the economizer actuator is at 10 vdc and the supply air temperature cannot be controlled to within 5 degrees of the Cooling SAT Lower Setpoint compressor stage ...

Page 45: ...osed Cooling Operation Errors Each cooling system is monitored for operation outside of the intended parameters Errors are handled as described below All system errors override minimum run times for compressors NOTE The following components are needed to access the control points in the Smart Equipment control 1 Local LCD on Unit Control Board OR 2 Mobile Access Portal MAP Gateway Portable Source ...

Page 46: ...e of gas furnace units Compressor Protection In addition to the external pressure switches the compressors also have inherent internal protection If there is an abnormal temperature rise in a compressor the protector will open to shut down the compressor The UCB incorporates features to minimize compressor wear and damage An Anti Short Cycle Delay ASCD is utilized to prevent operation of a compres...

Page 47: ... the ICB enters a flame stabilization period If flame was not detected the GV closes and a retry operation begins During the flame stabilization period a loss of the flame for 2 seconds will cause the GV to close and the retry operation to begin After the flame stabilization period a loss of flame for 3 4 second will cause the GV to close and the retry operation to begin At the conclusion of the f...

Page 48: ...heat for a continuous five minute period the UCB will lock on the indoor blower When voltage is no longer sensed at the GV the UCB will de energize the indoor blower following the elapse of the fan off delay for heating If voltage has been sensed at the GV for at least 15 seconds during the fan on delay for heating and GV voltage or W1 is lost the indoor blower is forced on for the length of the f...

Page 49: ... 3 First stage compressors will energize after the built in time delay five minutes 4 The second stage of the thermostat will energize second stage compressor if needed Post Start Check List 1 Verify proper system pressures for both circuits 2 Measure the temperature drop across the evaporator coil Start Up Gas Heat Pre Start Check List Complete the following checks before starting the unit 1 Chec...

Page 50: ...ond stage and will run on Second stage for 1 minute Allow this one minute time period to expire and be certain the unit is running on first stage 4 Measure the time needed for one revolution of the hand on the smallest dial on the meter A typical gas meter has a 1 2 or a 1 cubic foot test dial 5 Using the number of seconds it takes for one revolution of the dial calculate the cubic feet of gas con...

Page 51: ...te and the data in Table 10 After the temperature rise has been determined the CFM can be calculated as follows After about 20 minutes of operation determine the furnace temperature rise Take readings of both the return air and the heated air in the ducts about 6 feet from the furnace where they will not be affected by radiant heat Increase the blower CFM to decrease the temperature rise decrease ...

Page 52: ... Gateway Instruction P N 24 10737 8 For more information on the Smart Equipment unit control board navigation refer to the Smart Equipment Quick Start Guide NOTE For more in depth sequence of operation of the Smart Equipment control refer to the Smart Equipment Controls Sequence of Operation Overview LIT 12011950 Figure 31 Unit Control Board INLET PRESSURE TAP HIGH LOW GAS ADJUSTMENT OUTLET PRESSU...

Page 53: ...ostat connection strip R terminal right FAN OVR pin right HPS1 pin right HPS2 pin lower DFS pin and lower APS pin Terminal Thermostat connection strip on left edge of UCB W1 1st stage heating request 24 VAC input switched from R Not effective for cooling only units W2 2nd stage heating request 24 VAC input switched from R Not effective for cooling only units or units with single stage heat section...

Page 54: ...re sensor input from 10KΩ 77 F Type III negative temperature coefficient thermistor Input required for operation but may be a communicated value 3 625 VDC reading OAT to OAT with open circuit Used in heat cool cutouts low ambient cooling determination dry bulb free cooling changeover outside air enthalpy calculation economizer loading operation heat pump demand defrost calculation CC1 1 refrigeran...

Page 55: ...B H1 24 VAC hot output for heat section stage 1 Not effective for cooling only units Output if demand is present and permissions allow one stage or two stages of heat section operation H2 24 VAC hot output for heat section stage 2 Not effective for cooling only units or units with single stage heat sections Output if demand is present and permissions allow two stages of heat section operation MV 2...

Page 56: ...h Not effective for one stage compressor UCBs Connects through circuit trace to the left HSP2 pin LPS2 left pin 24 VAC hot return from refrigerant circuit 2 Low Pressure Switch Not effective for one stage compressor UCBs Input is only considered after 30 seconds of C2 output afterwards input must be present to allow C2 output Three LPS2 trips in a one hour period cause a Low Pressure Switch 2 Lock...

Page 57: ...nected BUS BACnet MSTP communication Positive of the VDC typically a fluctuating 1 5 to 3 5 volts reading to COM at least 0 25 volts higher than FC bus BACnet MSTP communication circuit FC FC Field Connected BUS BACnet MSTP communication Positive of the VDC typically a fluctuating 1 5 to 3 5 volts reading to COM at least 0 25 volts lower than FC bus BACnet MSTP communication circuit COM Common for...

Page 58: ...22 AWG stranded shielded cable A 22 gauge cable offers the best performance for various baud rates cable distances and number of trunk devices primarily due to lower conductor to conductor capacitance Shielded cable offers better overall electrical noise immunity than non shielded cable Observe the shield grounding requirements 2 We recommend 26 AWG solid 6 wire 3 twisted pairs cable as the best f...

Page 59: ...58 258 77 25 7 6 85 137 57 303 87 24 8 0 95 139 56 347 97 23 8 5 300 Cfm Ton 80 72 75 135 60 258 77 25 7 5 85 140 59 303 87 23 8 0 95 146 58 348 97 20 8 4 300 Cfm Ton 75 62 75 128 53 258 77 23 7 6 85 129 52 301 86 22 8 1 95 129 52 344 96 22 8 6 400 Cfm Ton 80 62 75 140 62 261 77 23 7 9 85 141 61 304 87 23 8 3 95 143 60 347 97 22 8 8 400 Cfm Ton 80 67 75 141 63 261 77 23 7 8 85 144 62 305 87 22 8 3...

Page 60: ...65 78 22 10 4 85 153 65 310 88 21 11 1 95 156 64 354 98 20 11 8 400 Cfm Ton 75 62 75 139 62 262 77 22 10 2 85 141 60 305 87 21 10 9 95 143 59 349 97 20 11 6 Air Flow Indoor Db Wb Outdoor DB Suction Pressure Suction Temp Liquid Pressure Liquid Temp Delta T Db Compressor Amps 300 Cfm Ton 80 62 75 139 60 271 79 27 10 4 85 137 57 316 88 27 11 3 95 135 54 361 96 27 12 2 300 Cfm Ton 80 67 75 139 59 274 ...

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