Communication - Carrier 48HC 04-28 Controls, Start-Up, Operation And Troubleshooting

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 ComfortLink
controller to operate. The ERV monitors ComfortLink con-
troller points to determine operation. The ERV writes to
points in the ComfortLink controller to provide the user with
Table 11 — Inputs - Points the ERV Reads from ComfortLink Controller
SCROLLING
CCN POINT* MARQUEE
POINT†
NVO_MODE nvoUnitStatus.mode
OCCUPIED OCC Currently Occupied
IDFSTATE Indoor Fan State
FANSPEED F.SPD Commanded Fan Speed
ECONOCMD EC.CP Econo Commanded Position 0 to 100
IAQ IAQ IAQ Level (sensor)
IAQIN IAQ.S IAQ Level (switch)
SAT SAT Supply Air Temperature
OA_TEMP OAT Outdoor Air Temperature
SPACE_T SPT Space Temperature
RETURN_T RAT Return Air Temperature
PE_1 PE.1 Power Exhaust 1 Relay
PE_2 PE.2 Power Exhaust 2 Relay
ECONO EC.EN Economizer Installed
IAQANCFG IA.CF IAQ Analog Input Config
IAQANFAN IA.FN IAQ Analog Fan Config
IAQINCFG II.CF IAQ Switch Input Config
IAQINFAN II.FN IAQ Switch Fan Config
DAQ_LOW AQD.L AQ Differential Low
DAQ_HIGH AQD.H AQ Differential High
IAQOVPOS OVR.P IAQ Override Position
S_OADMPR OA.DM OAU 2 - position Damper
S_WHEEL WHL OAU Wheel Test
S_OAFAN OA.OF OAU OA Fan Speed Test
S_EXFAN OA.XF OAU PE Fan Speed Test
S_OAHEAT OA.HT OAU Tempring Heater Test
* 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.
EXPANDED TEXT RANGE
xxxx
No/Yes
Off/On
xxx
xxxx
Low/High
xxx.x
xxx.x
xxx.x
xxx.x
Off/On
Off/On
No/Yes
0=No IAQ
1=DCV
2=Override IAQ
3=Ctrl Min Pos
0=Never
1=Occupied
2=Always
0=No IAQ
1=DCV N/O
2=DCV N/C
3=Override N/O
4=Override N/C
0=Never
1=Occupied
2=Always
0 to 5000
0 to 5000
0 to 100
Close/Open
0 to100
0 to100
0 to100
0 to 100
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 ComfortLink
points that the ERV monitors for operation and a brief de-
scription of their functions. Table 12 shows the ComfortLink
points that the ERV uses for its configurations and a brief de-
scription of each. Table 13 shows the ComfortLink points that
the ERV writes to based on its running status.
UNITS DEFAULT
Determine what mode RTU is in
Determine if RTU is occupied
Determine if the RTU indoor fan is running
% Determine if the RTU indoor fan is running
% Determine if the RTU commands free cooling
Space CO
Determine if CO
°F RTU supply air temp
°F RTU Outdoor Temp
°F Building Space Air Temp
°F Building Return Air Temp
N/A
N/A
No: no FIOP Determine if there is a Economizer damper
Yes: FIOP (wheel Bypass)
0: no FIOP Tells if a sensor is installed for DCV or override
1: FIOP
0 Tells if the ERV can run during unoccupied for
high CO
0 Tells if a switch is installed for DCV or override
0 Tells if the ERV can run during unoccupied for
high CO
100 Sets indoor/outdoor PPM difference to start
ventilating more
700 Sets indoor/outdoor PPM at which max vent
occurs
% 100 Sets OA fan speed during override
Close Test damper while in test mode
% 0 Test wheel while in test mode
% 0 Test intake fan(s) while in test mode
% 0 Test exhaust fan(s) while in test mode
% 0 Test tempering heater while in test mode
36
FUNCTION
sensor level (PPM)
2
is high or low
2
2
2