iAIRE
OM manual
iAIRE, LLC
109
12
Service
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution will result in equipment
damage.
Do NOT
exceed the recommended minimum Hz or
CFM settings. Operating these units at a Hz setting
below 40 Hz or at a CFM below the minimums listed
in Tables 2 through 10 (see page 3) will result in
damage to the unit.
CAUTION
!
Figs. 4 through 10 show the location of the VDF option in
the various units covered by this document.
Staged Air Volume (SAV) Option Components –
The SAV
factory option is comprised of three major components and
related connecting harnesses:
1. Fan Speed Relay Board
2. Variable Frequency Drive
3. Indoor Fan Motor, designed for use with VFD
Fan Speed Relay Board –
This board (PNO
HK50ZA002) is designated as the VFD Fan Board on the
unit wiring diagram labels. It is a small (3.0 x 3.12 in, 76
x 79 mm) printed circuit board with four SPDT control
relays. See Fig. 14. There is no software on this board.
The relay board is located in the unit’s main control box;
refer to unit label diagram for Component Location view.
C150081
Fig. 14 -- VFD Fan Board
The board is arranged in two separate circuits with individual
pin connectors. Connector J1 is connected to the 24--vac input
signal circuit with the four relay coils. Connector J2 is
connected to the 24--VDC output circuit that connects to the
VFD’s terminal strip. See Fig. 11 for a simplified connection
schematic for Fan Speed Relay board and the VFD.
In this SAV application, there are three inputs to the relay
board, originating from the space thermostat’s G, Y2 and
W1 terminals. An input from terminal G (for continuous
fan operation for ventilation or from a Y1 call) will result
in the VFD starting the indoor fan motor and running the
motor at LOW speed. An input from either Y2 or W1 will
result in the VFD running the indoor fan motor at HIGH
speed. See Table 11 for relay operation for each unit
mode. Relay K4 is not used in this 2--speed application.
Table 11 – Two--Speed Configuration Logic
(Thermostat Control)
INPUT
Relay Coil
Status
Controlling
Output
Fan Motor
Speed
K1
K2
K3
G
Off
Off
On
K3
Low (40 Hz)
Y1
Off
Off
On
K3
Low (40 Hz)
Y2
Off
On
On
K2
High (60 Hz)
W1
On
On
On
K1
High (60 Hz)
Configuration Jumpers –
The relay board has two
configuration jumpers, marked JW1 and JW2. For this
2--speed motor application, both jumpers must be cut and
open (see Fig. 15). Factory--installed boards will have
these jumpers cut. Service replacement boards have these
jumpers intact; servicer must cut both jumpers when
installing a new service board. Failure to cut these
jumpers will cause continuous fan motor operation.
Cut Jumper JW2
- as shown
Cut Jumper JW1
- as shown
C150082
Fig. 15 -- Jumpers JW1 & JW2 Cut for Two--Speed
Fan Board Configuration
Variable Frequency Drive –
The VFD is used to switch
the indoor fan motor speed between full/high speed (60HZ
motor operation) and reduced/low speed (40HZ motor
operation) as required by ASHRAE 90.1 requirements for
two--stage HVAC units. The VFD is factory--configured to
match the current and power requirements for each motor
selection and all wiring connections are completed by the
factory; no field adjustments or connections are necessary.
While the basic VFD retains all of its standard
capabilities, the SAV 2--speed application uses only a
limited portion of these features to provide two discrete
output speeds to the motor. Consequently the VFD is not
equipped with a keypad. A keypad is available as an
accessory (PNO CRDISKIT001A00) for field--installation
Summary of Contents for ultraDRY
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Page 78: ...iAIRE LLC iAIRE OM manual 78 APPENDIX A CAPACITY CONTROL DEVICE ...
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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 156: ...iAIRE LLC iAIRE OM manual 156 APPENDIX F SPLIT SYSTEM DAT SENSOR INSTALLATION ...
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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 ...