Envision NDZ 022 A11AC Installation Manual Download Page 18

18

ENVISION SERIES INSTALLATION MANUAL 

Startup

The unit will not operate until all the inputs and safety controls 

are checked for normal conditions. At first power-up, a four-minute 

delay is employed before the compressor is energized.

Component Sequencing Delays

Components are sequenced and delayed for optimum space 

conditioning performance. 

Accessory Relay 

An accessory relay on the control board allows for field 

connection of solenoid valves, electronic air cleaners, etc. The 

accessory relay has a normally open output and a normally closed 
output.

Short Cycle Protection 

The control employs a minimum "off" time of four minutes to 

provide for short cycle protection of the compressor.

Shutdown Mode

A 24VAC common signal to the “shutdown” input on the control 

board puts the unit into shutdown mode. Compressor, hot water 

pump and fan operation are suspended.

Safety Controls

The Envision control receives separate signals for a high 

pressure switch for safety, a low pressure switch to prevent loss 
of charge damage, and a low suction temperature thermistor for 

freeze sensing. Upon a continuous 30-second measurement of 

the fault (immediate for high pressure), compressor operation is 
suspended, the appropriate lockout LED begins flashing. (Refer to 
the "Fault Retry" section below.)

Testing

The Envision control allows service personnel to shorten most 

timing delays for faster diagnostics. (Refer to the Field Selection 

DIP switch SW2-1 on page 21.)

Fault Retry

All faults are retried twice before finally locking the unit out. An 

output signal is made available for a fault LED at the thermostat. 
The “fault retry” feature is designed to prevent nuisance service 
calls.

Diagnostics

The Envision control board allows all inputs and outputs to be 

displayed on the LEDs for fast and simple control board diagnosis.  

(Refer to the Field Selection DIP Switch SW2-1 on page 21.)

Hot Water High Limit 
(Domestic Hot Water Option)

This mode occurs when the hot water input temperature is at 

or above 130°F for 30 continuous seconds. The DHW limit status 
LED on the unit illuminates and the hot water pump de-energizes. 
Hot water pump operations resume on the next compressor cycle 

or after 15 minutes of continuous compressor operation during the 
current thermostat demand cycle.

Hot Water Justification

Since compressor hot gas temperature is dependant on loop 

temperature in cooling mode, loop temperatures may be too low 
to allow proper heating of water. The control will monitor water and 

refrigerant temperatures to determine if conditions are satisfactory 

for heating water. The DHW limit status LED on the unit illuminates 
when conditions are not favorable for heating water.

Heating Operation

Heat, 1st Stage (Y1)

The fan motor is started on low speed immediately (PSC 

ON), the loop pump is energized 5 seconds after the “Y1” input 
is received, and the compressor is energized on low capacity 10 
seconds after the “Y1” input. The fan is switched to medium speed 
15 seconds after “Y1” input (ECM only). The hot water pump is 

cycled 30 seconds after the "Y1" input.

Heat, 2nd Stage (Y1,Y2) Single-Speed Units

The hot water pump is de-energized, which directs all heat  

to satisfying the thermostat, and the fan changes to high speed  

15 seconds after the "Y2" input (ECM only).

H

eat, 2nd Stage (Y1,Y2) Dual Capacity Units

The second stage compressor will be activated 5 seconds 

after receiving a “Y2” input as long as the minimum first stage 
compressor run time of 1 minute has expired. The ECM blower 

changes from medium to high speed 15 seconds after the “Y2” input.

The Comfort Alert will delay the second stage compressor  

until 5 seconds after it receives a “Y2” from the board.

Heat, rd Stage (Y1,Y2,W) Single-Speed Units

The first stage of resistance heat is energized 10 seconds 

after “W” input, and with continuous 3rd stage demand, the 

additional stages of resistance heat engage sequentially 
every 5 minutes.

Heat, rd Stage (Y1,Y2,W) Dual Capacity Units

The hot water pump is de-energized which directs all heat  

to satisfy the thermostat.  The 1st stage of resistance heat is  

energized 10 seconds after “W” input, and with continuous 3rd 
stage demand, the additional stages of resistance heat engage 

sequentially every 5 minutes.

Emergency Heat (W only)

The fan is started on high speed, and the first stage of  

resistance heat is energized 10 seconds after the "W" input.  

Continuing demand will engage the additional stages of    

resistance heat sequentially every 2 minutes.

Microprocessor Control

Summary of Contents for NDZ 022 A11AC

Page 1: ...uperheater Connections Electrical Startup Procedures Troubleshooting Preventive Maintenance IM1592 06 07 Envision Series Geothermal Indoor Split Heat Pumps R 410A Refrigerant 2 6 Ton Single Speed 2 6...

Page 2: ...6 1 59 56 1 59 74 2 1 90 2 55 92 2 61 108 3 06 52 1 47 56 1 59 90 2 55 92 2 61 104 2 95 Coax and Water Piping Water Connections Size Swivel in mm 1 25 4 HWG Connection Size Swivel in mm 1 25 4 Coax Pi...

Page 3: ...ed Loop Ground Source Systems 12 Desuperheater 13 14 Electical Data 14 Thermostat Wiring 15 Wiring Schematics 16 17 Microprocessor Control Features and Operation 18 19 Operation Logic Data 20 DIP Swit...

Page 4: ...are located in unconditioned spaces to prevent damage from frozen water lines and excessive heat that could damage electrical components Air Coil Location Refer to the air handler manufacturer s instr...

Page 5: ...ing an Envision Split to an air handler coil Select R 410A components only Select 12 SEER or higher air handler coil Match the air handler to the air handler coil data table on page 9 Indoor matching...

Page 6: ...e capacity of the unit refer to page 9 Line sets should be routed as di rectly as possible avoiding unnecessary bends or turns All wall penetrations should be sealed properly Line set should not come...

Page 7: ...oil should be located in the supply side of the furnace to avoid condensation damage to the furnace heat exchanger A high temperature limit should be installed upstream of the coil to de energize the...

Page 8: ...swivel connector prior to attempting any connection The rubber seals are shipped attached to the waterline To make the connec tion to a ground loop system mate the brass connector supplied in CK4L con...

Page 9: ...8 OD 3 4 OD 3 8 OD 7 8 OD 1 2 OD 74 NZ048 NAH060 3 4 OD 3 8 OD 7 8 OD 3 8 OD 7 8 OD 1 2 OD 90 NZ060 NAH060 7 8 OD 1 2 OD 7 8 OD 1 2 OD 1 1 8 OD 1 2 OD 92 NZ070 NAH060 7 8 OD 1 2 OD 7 8 OD 1 2 OD 1 1 8...

Page 10: ...storm sewer drain field adjacent stream or pond etc Most local codes forbid the use of sanitary sewer for disposal Consult your local building and zoning depart ments to ensure compliance in your are...

Page 11: ...iron bacteria will be pres ent a closed loop system is recommended The heat exchanger coils in ground water systems may over a period of time lose heat exchange capabilities due to a buildup of miner...

Page 12: ...in the specification cata log Usually 2 5 to 3 GPM of flow per ton of cooling capacity is recommended in earth loop applications Multiple Units on One Flow Center When two units are connected to one l...

Page 13: ...erheater pump to operate during these conditions actually removes heat from the DHW circulating through the unit To overcome this Envision unit microprocessors have been programmed to disengage the de...

Page 14: ...ndicator plug 1 turn on the motor end of the pump until all air is purged from the pump then tighten the plug Use vent couplings to bleed air from the lines 6 Carefully inspect all plumbing for water...

Page 15: ...ay Note Field installed DPST dual fuel relay Required for dual fuel installation Auxiliary Heat Relay P2 P1 Shut Down chassis Envision Split Auxiliary Heat Relay HWA Ext Total Min Max Pump Loop Unit C...

Page 16: ...lug Ground Fuse CC CO CR1 CR2 CR3 CR4 F1 and F2 WCL HE HP LP PB1 PB2 PS RV SW1 SW2 SW3 SW4 TS Compressor Contactor Condensate overflow sensor DHW pump relay Loop pump relay Fuses Water Coil Limit Sens...

Page 17: ...ON for unzoned Dual Cap E Series or Premier 2 speed units Thermistor Light emitting diode Green Relay coil Capacitor w bleed resistor Switch Condensate overflow Switch High pressure Switch Low pressur...

Page 18: ...ons resume on the next compressor cycle or after 15 minutes of continuous compressor operation during the current thermostat demand cycle Hot Water Justification Since compressor hot gas temperature i...

Page 19: ...ard Fan G only The fan starts on low speed PSC ON Regardless of fan input G from thermostat the fan will remain on low speed for 30 seconds at the end of each heating cooling or emergency heat cycle L...

Page 20: ...ondary 1 Out On On On Off On On Emerg LED Off Off Off On Off Off Off T Stat Signal Y1 Y1 Y2 Y1 Y2 W W Y1 O Y1 Y2 O G DUAL CAPACITY UNITS Compressor Lo On Off Off Off On Off Compressor Hi Off On On Off...

Page 21: ...play viewed at LEDs 7 Output Diagnostics Allows viewing the outputs from the control board such as the compressor reversing valve blower hot water pump and loop pump on the LED display Diagnostic Outp...

Page 22: ...hould be painted with UV resistant paint or covering to insure long insulation life Fasten the copper line set to the blower coil unit as instructed by the coil installation instructions shown in Figu...

Page 23: ...ling should rise and the superheat should fall until 8 16 degrees of superheat is reached when the TXV should be metering the system See operating details in the startup section of this manual for exa...

Page 24: ...e liquid line just outside the split cabinet This location will be adequate for measurement in both modes unless a significant temperature drop in the liquid line is anticipated Measure the liquid lin...

Page 25: ...6 128 5 586 146 5 108 35 4 228 78 1 348 106 7 468 128 8 588 146 8 110 36 4 230 78 7 350 107 2 470 129 1 590 147 1 112 37 3 232 79 2 352 107 6 472 129 4 592 147 3 114 38 2 234 79 8 354 108 0 474 129 8...

Page 26: ...Suction Pressure PSIG Discharge Pressure PSIG Superheat Subcooling Water Temp Drop F Air Temp Rise F DB 1 5 69 81 254 334 7 13 5 13 7 10 18 24 3 0 75 87 260 340 7 14 5 13 3 6 20 26 1 5 98 113 293 373...

Page 27: ...9 14 7 15 8 12 24 28 3 0 140 160 335 390 9 14 7 15 6 10 22 30 Second Stage Operation Suction Pressure PSIG Discharge Pressure PSIG Superheat Subcooling Water Temp Rise F Air Temp Drop F DB 1 5 120 13...

Page 28: ...e cooling mode Cooling setpoint must be set below room temperature 3 First stage cooling will energize after a time delay 4 Be sure that the compressor and water control valve or loop pump s are activ...

Page 29: ...ation papers Final Evaluation After the initial check of superheat subcooling values in the heating mode shut off the unit and allow it to sit 3 to 5 min utes until pressures equalize Restart the unit...

Page 30: ...sure suction temperature here at TXV bulb in cooling modes Cooling Cycle Analysis COOLING TXV ACTIVE RIGHT TO LEFT ClgTXV Measure liquid line temperature and pressure here in both heating and cooling...

Page 31: ...4 18 6 0 5 7 5 3 4 9 4 6 21 7 8 7 3 6 8 6 4 5 9 10 2 3 2 1 2 0 1 9 1 7 13 3 6 3 3 3 0 2 8 2 6 16 5 0 4 6 4 3 4 0 3 7 19 6 5 6 2 5 8 5 4 5 0 5 30 06 038 full load 049 part load 064 full load 072 part l...

Page 32: ...ed and super heat and subcooling numbers calculated If superheat and subcooling are outside recommended ranges an adjustment to the refrigerant charge may be necessary Notes Refrigerant tests must be...

Page 33: ...essary Units should never be operated without a filter Condensate Drain In areas where airborne bacteria produce a slime in the drain pan it may be necessary to treat chemically to minimize the proble...

Page 34: ...0 UNIT DEPTH D 1 93 D 2 21 WATER IN E 6 93 E 7 21 WATER OUT F 8 44 F 9 21 BRASS SERVICE VALVE LIQUID G 11 55 G 12 14 BRASS SERVICE VALVE GAS H 13 43 H 15 83 DESUPERHEATER IN J 16 43 J 18 83 DESUPERHEA...

Page 35: ...35 ENVISION SERIES INSTALLATION MANUAL Installation Notes...

Page 36: ...duct research and development and reserves the right to change design and specifications without notice 2007 WFI Product Envision Series Type Geothermal Indoor Split Heat Pumps Size 2 thru 5 5 Ton Sin...

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