Lennox ZHA Series Unit Information Download Page 38 | Manualshive

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Page 38

ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT

POWER:

1- Terminal strip TB1 energizes thermostat components with 24VAC.

OPERATION:

2- TB1 receives data from the electronic thermostat A2 (Y1, Y2, W1, W2, G, OCP). The 24VAC signal from TB1 ener

gizes the appropriate components for heat or cool demand.

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Summary of Contents for ZHA Series

Page 1: ...personal injury or loss of life Installation and ser vice must be performed by a licensed professional HVAC installer or equivalent service agency CAUTION Electrostatic discharge can affect electronic...

Page 2: ...890 rpm Factory O O O Kit 2 800 1105 rpm Factory O O O Kit 3 795 1195 rpm Factory O O O Kit 4 730 970 rpm Factory O O O Kit 5 940 1200 rpm Factory O O O Kit 6 1015 1300 rpm Factory O O O Kit 10 900 1...

Page 3: ...X ELECTRICAL Voltage 60 hz 208 230V 3 phase Factory O O O 460V 3 phase Factory O O O 575V 3 phase Factory O O O Bottom Power Entry Kit Z1PEKT01B 1 11H66 X X X ELECTRIC HEAT 7 5 kW 208 230V 3ph Z1EHO0...

Page 4: ...ometric Relief Dampers With Exhaust Hood LAGEDH03 15 53K04 X X X OUTDOOR AIR Outdoor Air Dampers Motorized Dampers with outdoor air hood Z1DAMP20B 1 10Z33 X X X Manual Dampers with outdoor air hood Z1...

Page 5: ...800 8800 Indoor Coils Net face area total sq ft 12 8 12 8 12 8 12 8 Tube diameter in 3 8 3 8 3 8 3 8 Number of rows 3 3 4 4 Fins per inch 14 14 14 14 Drain connection Number and size 1 1 in NPT coupli...

Page 6: ...g Expansion device type Refrigerant Metering Orifice RFC 2 Indoor Blower and Drive Selection Nominal motor output 2 hp 3 hp 5 hp Maximum usable motor output US Only 2 3 hp 3 45 hp 5 75 hp Motor Drive...

Page 7: ...0 49 650 0 70 719 0 87 786 0 98 852 1 09 915 1 20 972 1 32 1026 1 47 1076 1 65 2250 533 0 41 599 0 62 667 0 82 735 0 99 802 1 10 866 1 21 928 1 33 984 1 46 1037 1 63 1085 1 81 1132 2 01 1178 2 21 1226...

Page 8: ...913 1 57 968 1 74 1020 1 93 1068 2 13 1116 2 34 1165 2 56 1215 2 78 1268 3 01 3000 620 0 95 678 1 11 741 1 25 806 1 40 870 1 58 930 1 75 985 1 94 1036 2 14 1084 2 36 1131 2 58 1180 2 80 1230 3 02 1283...

Page 9: ...POWER EXHAUST FAN PERFORMANCE Return Air System Static Pressure Air Volume Exhausted in w g cfm 0 3575 0 05 3405 0 10 3550 0 15 3245 0 20 3115 0 25 3020 0 30 2900 0 35 2785 FACTORY INSTALLED OPTIONS F...

Page 10: ...00 0 44 0 36 0 29 0 21 4200 0 49 0 40 0 33 0 24 4400 0 54 0 44 0 37 0 27 4600 0 60 0 49 0 42 0 31 4800 0 65 0 53 0 46 0 35 5000 0 69 0 58 0 50 0 39 5200 0 75 0 62 0 54 0 43 CEILING DIFFUSER AIR THROW...

Page 11: ...ric Heat 7 5 kW 58 61 61 64 68 71 32 33 36 24 25 28 15 kW 77 83 81 87 87 93 43 44 47 33 34 37 22 5 kW 97 106 100 109 107 116 54 56 59 42 43 46 30 kW 117 129 120 132 127 139 66 67 70 51 52 55 45 kW 156...

Page 12: ...ric Heat 7 5 kW 60 63 63 66 70 73 33 35 37 25 26 29 15 kW 80 86 83 89 90 96 45 46 49 34 35 38 22 5 kW 99 108 102 111 109 118 56 57 60 43 44 47 30 kW 119 131 122 134 129 141 67 69 71 52 53 56 45 kW 158...

Page 13: ...eat 15 kW 88 94 91 97 98 104 47 48 51 37 38 40 22 5 kW 108 117 111 120 117 126 58 60 62 46 47 49 30 kW 127 139 130 142 137 149 70 71 74 55 56 58 45 kW 166 184 169 188 176 194 92 94 96 73 74 76 60 kW 1...

Page 14: ...7 100 1 20 7 70 700 1 27 5 93 900 1 41 3 141 000 1 55 1 188 000 1 240 7 5 25 600 1 15 0 51 200 1 22 5 76 800 1 30 0 102 400 1 45 0 153 600 1 60 0 204 800 1 440 6 9 21 500 1 12 6 43 000 1 18 9 64 500 1...

Page 15: ...TIONAL F4 FUSE BLOCK OPTIONAL BLOWER HOUSING INVERTER OPTIONAL ELECTRIC HEAT CONTROLS 20 x 24 x 2 FILTERS BEHIND COIL TB1 LOW VOLTAGE TERMINAL STRIP TB13 HIGH VOLTAGE TERMINAL STRIP TB2 TERMINAL BLOCK...

Page 16: ...tors with a 24VAC coil K1and K2 energize compres sors B1 and B2 respectively in response to first or second stage cooling demands On CE M volt units contactor is CE approved by manufacturer Siemens Se...

Page 17: ...to the motor When the relay senses and overload condition a set of normally closed contacts open to de en ergize 24VAC power T1 transformer 13 Terminal Block TB1 TB1 provides 24VAC field connections...

Page 18: ...ing jumper is in the TEST position at power up the defrost control will ignore the test pins When the jumper is placed across the TEST pins for two seconds the control will enter the defrost mode If t...

Page 19: ...TDOOR COIL STAGE 1 UPPER OUTDOOR COIL STAGE 2 LOWER DRIERS S4 HIGH PRESSURE LIMIT S7 HIGH PRESSURE LIMIT S5 HIGH TEMPERATURE LIMIT S8 HIGH TEMPERATURE LIMIT COMPRESSOR 2 DISCHARGE LINE COMPRESSOR 2 SU...

Page 20: ...sound will be heard when the compressor is running un loaded Protector will reset when low pressure in system rises above 40 psig DO NOT REPLACE COMPRESSOR 2 Thermal Protectors S5 S8 Some compressors...

Page 21: ...rma tion and available replacements All units are equipped with belt drive blowers 1 Blower Wheels All units have one 15 in x 15 in 381 mm x 381 mm blower wheel 2 Indoor Blower Motor B3 All units use...

Page 22: ...base should be equal at both ends i e par allel along gap 3 Tighten four bolts securing motor mounting base to frame 4 Relieve tension on two adjusting bolts PULLEY MOTOR SIDE VIEW ALLEN SCREW BELT AD...

Page 23: ...bolt to the left or counterclockwise to loosen belt tension IMPORTANT Align top edges of blower motor base and mounting frame base parallel before tightening two bolts on the other side of base Motor...

Page 24: ...ting the unit 5 Recheck voltage and amp draw with unit running If voltage is not within range listed on unit nameplate stop unit and consult power company Refer to unit nameplate for maximum rated loa...

Page 25: ...harge NOTE System charging is not recommended below 60_F 15_C In temperatures below 60_F 15_C the charge must be weighed into the system If weighing facilities are not available or to check the charge...

Page 26: ...temperature TABLE 4 092S Normal Operating Pressures Outdoor Coil Entering Air Temperature 65 F 75 F 85 F 95 F 105 F 115 F Suct psig Disc psig Suct psig Disc psig Suct psig Disc psig Suct psig Disc ps...

Page 27: ...19 337 120 383 121 430 127 491 Circuit 1 124 265 132 309 137 355 141 405 145 459 145 515 129 268 138 312 146 363 153 415 159 472 160 530 116 260 119 298 123 340 126 385 131 437 136 405 125 266 128 306...

Page 28: ...10 127 354 131 401 134 448 137 498 132 279 140 319 145 365 148 414 152 469 155 524 137 284 147 329 155 379 163 430 171 486 171 539 11 70 80 90 100 110 120 130 Suction Pressure psig Outdoor Temperature...

Page 29: ...panel on back side of unit See figure 13 Lift filter stop to remove filters See fig ure 14 WARNING Units are shipped from the factory with temporary fil ters Replace filters before building is occupie...

Page 30: ...ial coil cleaner and inspect monthly during the cooling season Outdoor coils are made of single and two formed slabs On units with two slabs dirt and debris may become trapped between the slabs To cle...

Page 31: ...detailed installa tion procedures FIGURE 16 ASSEMBLED ROOF MOUNTING FRAME SUPPLY AIR OPENING RETURN AIR OPENING FIGURE 17 ROOF MOUNTING FRAME Extends around entire perimeter of unit FIBERGLASS INSULAT...

Page 32: ...led a steady green DCV LED indicates that the IAQ reading is higher than set point requiring more fresh air See figure 20 FIGURE 20 A6 ENTHALPY CONTROLLER A B C D Open Min Pos FREE COOLING SETPOINT A...

Page 33: ...ximate desired fresh air percentage Note Damper minimum position can be set lower than traditional minimum air requirements when an IAQ sensor is specified Dampers will open to DCV MAX setting if CO2...

Page 34: ...time period a cooling demand will open dampers to minimum position and mechanical cooling functions normally During the occupied time period dampers will open to DCV MAX when IAQ reading is above set...

Page 35: ...n dampers are further open Adjust the EXH SET potentiometer lower counterclockwise toward 2V to energize fans when dampers are further closed Thirty second delay allows dampers to partially open be fo...

Page 36: ...Page 36 VIII Wiring Diagrams and Sequence of Operation ZHA UNIT DIAGRAM 1 2 5 15 13 18 14 19 11 20 21 7 8 2 10 11 7 14 6 15 8...

Page 37: ...133 relay coil which closes K133 1 N O contacts 24VAC is routed to S7 and S8 N C high pressure switches Compressor con tactor K2 is energized 10 K2 closes energizing compressor B2 First Stage Heat com...

Page 38: ...OSTAT POWER 1 Terminal strip TB1 energizes thermostat components with 24VAC OPERATION 2 TB1 receives data from the electronic thermostat A2 Y1 Y2 W1 W2 G OCP The 24VAC signal from TB1 ener gizes the a...

Page 39: ...supplies B7 with 0 10 VDC to control the positioning of economizer 4 The EXH power exhaust set point found on the face of A6 is factory set at approximate 50 of the dial range Econ omizer control mod...

Page 40: ...Page 40 EHA 7 5 15 22 5 30 45 60kW Y VOLTAGE ZHA SERIES UNITS 1 6 3 3 5 4 Heat 2 W2 24V Power R 24V Common C 5...

Page 41: ...Page 41 EHA 7 5 15 22 5 30 45 60kW G J VOLTAGE ZHA SERIES UNITS 1 6 3 3 4 5 5 Heat 2 W2 24V Power R 24V Common C...

Page 42: ...into defrost mode 3 24VAC W2 signal is routed from the thermostat through TB1 to P2 2 After S15 N C primary limit and S19 sec ondary limit is proved the electric heat contactor K15 is energized 4 N O...

Page 43: ...Page 43 TYPICAL MSAV UNIT DIAGRAM 2 5 6 4 6 4 1 2 5...

Page 44: ...speed in the same manner as G Blower Demand Y2 Cooling Demand 4 K186 relay is energized and K186 N O contacts close 5 The blower demand closes K117 N O contacts 24VAC is routed through K117 and K186 c...

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