iAIRE, LLC
iAIRE
OM manual
106
9
Pre--Start Check, SAV Option
1. Remove the access panel to reach the VFD.
S
48/50 Series: Blower compartment panel
S
40RU: Rear access panel
NOTE
: See Figs. 4 through 10 for VFD location in the
units covered by this document.
2. Read all safety, caution and warning labels.
3. Inspect wiring at the VFD for loose or disconnected
wires at the terminal strip and for wires in contact
with sharp edges and moving parts (pulley, belt,).
START--UP, SAV Option
Compressor Rotation:
Units equipped with a VFD on the indoor fan motor
cannot use rotation direction of the indoor fan motor and
fan to visually confirm a correct phase connection to the
unit and compressors. Pressure gages MUST BE USED
during cooling system start--up to confirm correct
compressor rotation and operation.
Indoor Fan Motor:
Raise the cooling set point at the space thermostat to
higher than space temperature. Switch the thermostat’s
FAN switch to CONT (Continuous) position. Fan motor
will start, run at reduced speed.
Check for fan rotation direction. To reverse the fan
rotation, disconnect all power to unit and then switch two
motor power leads between the VFD and the motor.
Restore unit power and recheck fan rotation direction.
Check fan motor speed. Motor shaft should be rotating at
1150--1180 RPM (19.2--19.7 r/s).
Switch the thermostat’s FAN switch to AUTO position.
Fan motor will stop.
Cooling with SAV:
1st Stage (Y1):
Set the thermostat FAN switch to AUTO
and the SYSTEM switch to COOL. Slowly lower the
cooling setpoint until first stage compressor starts. Indoor
fan motor also starts, runs at reduced speed.
2nd Stage (Y2)
: Lower the cooling setpoint until second stage
compressor starts. Indoor fan motor will switch to high speed.
Check fan motor speed. Motor shaft should be rotating at
1725--1760 RPM (28.8--29.3 r/s).
Confirm compressors are running at correct rotation by
checking suction and discharge pressures. To reverse the
compressor rotation, disconnect unit power and switch
two of the unit’s main power leads. Restore unit power
and recheck compressor operation.
Reset thermostat cooling setpoint to a position above
space temperature. Both compressors will shut off. Indoor
fan motor will stop immediately.
40RU, 50--Series units:
Indoor fan motor will stop
immediately.
48--Series units:
Indoor fan operation will continue for
45--seconds, then stop.
Operating Sequences, SAV Option
Ventilation (Fan only)
Ventilation mode occurs when the indoor fan runs without
accompanying cooling or heating system operation. The
thermostat’s FAN selection switch will be in CONT
(Continuous) position; no demand for cooling or heating
will be present.
48--Series units:
The thermostat’s G terminal is energized
with 24--v. This signal is conveyed to the 48--Series unit’s
Central Terminal Board (CTB) at the field connection
TSTAT terminal strip at terminal G. The 24--v signal
follows an internal trace path through jumper JMP6 to
connector CONTL BOARD pin 1. A harness wire
connects pin 1 to IGC board terminal G. The IGC
energizes its fan relay, energizing IGC terminal IFO. This
24--v signal follows a harness conductor back to the
CTB’s CONTL BOARD connector at pin 6 and pin 7. Pin
7 is connected to the Fan Speed Board at connector J1 pin
4. Relay K3 is energized. A 24--VDC signal is passed to
the VFD terminal 14. The VFD starts the indoor fan motor
and runs it at 40HZ for reduced/low speed operation.
50HC, TC--Series units:
The thermostat’s G terminal is
energized with 24--v. This signal is conveyed to the
50HC,TC--Series unit’s Control Terminal Board (CTB) at
the field connection TSTAT terminal strip at terminal G.
The 24--v signal follows an internal trace path through
jumper JMP6 to connector CONTL BOARD pin 1. A
harness wire connects pin 1 to the Fan Speed Board at
connector J1 pin 4. Relay K3 is energized. A 24--VDC
signal is passed to the VFD terminal 14. The VFD starts
the indoor fan motor and runs it at 40HZ for reduced/low
speed operation.
50TCQ, HCQ--Series:
The thermostat’s G terminal is
energized with 24--v. This signal is conveyed to the
50HCQ,TCQ--Series unit’s Control Terminal Board (CTB)
at the field connection TSTAT terminal strip at terminal
G. The 24--v signal follows an internal trace path to
connector REHEAT/DEFROST pin 1. A harness wire
connects pin 1 to DFB board terminal P2--3. The DFB
energizes its fan relay, energizing DFB terminal P3--8.
This 24--v signal follows a harness conductor back to the
CTB’s REHEAT/DEFROST pin 2. An internal trace path
connects pin 2 to CONTL BOARD connector at pin 1. Pin
1 is connected to the Fan Speed Board at connector J1 pin
4. Relay K3 is energized. A 24--VDC signal is passed to
the VFD terminal 14. The VFD starts the indoor fan motor
and runs it at 40HZ for reduced/low speed operation.
Cooling (FAN switch in AUTO)
1st Stage (Y1):
When the thermostat initiates a call for 1st
Stage Cooling by closing its Y1 contacts, the thermostat also
energizes its G terminal. Follow the sequence under
Ventilation above. Fan Speed Relay board relay K3 is
energized, causing the VFD to start the indoor fan motor and
run at 40HZ for reduced fan speed operation.
When space temperature drops to satisfy the thermostat Y1
demand, contact Y1 opens de--energizing terminal G. Relay
K3 is de--energized. The relay board output at J2--2 to the
VFD is removed and indoor fan motor ramps down to stop.
Summary of Contents for ultraDRY
Page 1: ...O M manual PD 02 22 2020 v 5 71 ultraDRY outside air solutions ...
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Page 81: ...iAIRE OM manual iAIRE LLC 81 CALL US TODAY 800 231 3112 TO DISCUSS YOUR APPLICATION ...
Page 84: ...iAIRE LLC iAIRE OM manual 84 APPENDIX B VFD ...
Page 85: ...iAIRE OM manual iAIRE LLC 85 Operating Instructions SMVector Frequency Inverter ...
Page 129: ...iAIRE OM manual iAIRE LLC 129 APPENDIX C ICM LOW AMBIENT CONTROL ...
Page 131: ...iAIRE OM manual iAIRE LLC 131 APPENDIX D SPACE SENSOR ...
Page 138: ...iAIRE LLC iAIRE OM manual 138 APPENDIX E SPLIT SYSTEM PIPING REQUIREMENTS ...
Page 139: ...iAIRE OM manual iAIRE LLC 139 iAIRE SPLIT SYSTEM PIPING CHART ...
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Page 172: ...iAIRE LLC iAIRE OM manual 172 APPENDIX J 24 7 TIMER ...
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Page 198: ...iAIRE LLC iAIRE OM manual 198 15 APPENDIX B Heatco Application Guide ...
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Page 215: ...iAIRE OM manual iAIRE LLC 215 APPENDIX L UPC BACNET INSTALLATION ...
Page 236: ...iAIRE LLC iAIRE OM manual 236 APPENDIX M BACNET TROUBLESHOOTING GUIDE ...