Carrier /50HC 04-28, Управление, запуск, эксплуатация и устранение неисправностей, Страница: 36 / 144

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When free cooling is desired and allowed the wheel is not
needed to pre-condition the air therefore an economizer damp-
er (wheel bypass) is used to bring in the outside air directly to
the mixing box.
COMMUNICATION
The ERV relies on communication with the
Comfort Link
controller to operate. The ERV monitors Comfort Link con-
troller points to determine operation. The ERV writes to
points in the Comfort Link controller to provide the user with
its running status. If communication is lost the ERV will shut
down and remain in the Off mode until communication is es-
tablished. Refer to the troubleshooting section for details on
communication failures. Table 11 shows the Comfort Link
points that the ERV monitors for operation and a brief de-
scription of their functions. Table 12 shows the Comfort Link
points that the ERV uses for its configurations and a brief de-
scription of each. Table 13 shows the Comfort Link points that
the ERV writes to based on its running status.
* These can be viewed under a variety of CCN tables with a CCN device.
† These can be viewed under a variety of menus on the scrolling marquee or Navigator™ display.
Table 11 — Inputs - Points the ERV Reads from Comfort Link Controller
CCN POINT*
SCROLLING
MARQUEE
POINT†
EXPANDED TEXT RANGE UNITS DEFAULT FUNCTION
NVO_MODE nvoUnitStatus.mode xxxx Determine what mode RTU is in
OCCUPIED OCC Currently Occupied No/Yes Determine if RTU is occupied
IDFSTATE Indoor Fan State Off/On Determine if the RTU indoor fan is running
FANSPEED F.SPD Commanded Fan Speed xxx % Determine if the RTU indoor fan is running
ECONOCMD EC.CP Econo Commanded Position 0 to 100 % Determine if the RTU commands free cooling
IAQ IAQ IAQ Level (sensor) xxxx Space CO
2
sensor level (PPM)
IAQIN IAQ.S IAQ Level (switch) Low/High Determine if CO
2
is high or low
SAT SAT Supply Air Temperature xxx.x °F RTU supply air temp
OA_TEMP OAT Outdoor Air Temperature xxx.x °F RTU Outdoor Temp
SPACE_T SPT Space Temperature xxx.x °F Building Space Air Temp
RETURN_T RAT Return Air Temperature xxx.x °F Building Return Air Temp
PE_1 PE.1 Power Exhaust 1 Relay Off/On N/A
PE_2 PE.2 Power Exhaust 2 Relay Off/On N/A
ECONO EC.EN Economizer Installed No/Yes No: no FIOP
Yes: FIOP
Determine if there is a Economizer damper
(wheel Bypass)
IAQANCFG IA.CF IAQ Analog Input Config 0=No IAQ
1=DCV
2=Override IAQ
3=Ctrl Min Pos
0: no FIOP
1: FIOP
Tells if a sensor is installed for DCV or override
IAQANFAN IA.FN IAQ Analog Fan Config 0=Never
1=Occupied
2=Always
0 Tells if the ERV can run during unoccupied for
high CO
2
IAQINCFG II.CF IAQ Switch Input Config 0=No IAQ
1=DCV N/O
2=DCV N/C
3=Override N/O
4=Override N/C
0 Tells if a switch is installed for DCV or override
IAQINFAN II.FN IAQ Switch Fan Config 0=Never
1=Occupied
2=Always
0 Tells if the ERV can run during unoccupied for
high CO
2
DAQ_LOW AQD.L AQ Differential Low 0 to 5000 100 Sets indoor/outdoor PPM difference to start
ventilating more
DAQ_HIGH AQD.H AQ Differential High 0 to 5000 700 Sets indoor/outdoor PPM at which max vent
occurs
IAQOVPOS OVR.P IAQ Override Position 0 to 100 % 100 Sets OA fan speed during override
S_OADMPR OA.DM OAU 2 - position Damper Close/Open Close Test damper while in test mode
S_WHEEL WHL OAU Wheel Test 0 to100 % 0 Test wheel while in test mode
S_OAFAN OA.OF OAU OA Fan Speed Test 0 to100 % 0 Test intake fan(s) while in test mode
S_EXFAN OA.XF OAU PE Fan Speed Test 0 to100 % 0 Test exhaust fan(s) while in test mode
S_OAHEAT OA.HT OAU Tempring Heater Test 0 to 100 % 0 Test tempering heater while in test mode