Carrier 62E ERV Troubleshooting, Symptom Possible Causes Action to Check Possible Remedy

Page 38

TROUBLESHOOTING

See Table 13 for troubleshooting information.

Table 13 — ERV Troubleshooting

SYMPTOM

POSSIBLE CAUSES

ACTION TO CHECK

POSSIBLE REMEDY

 

Disconnect switch is in the off

Verify that the disconnect switch is

Move the disconnect lever to the 'ON'

 

position

in the 'ON' position

position.

 

 

 

Using a volt meter verify that the voltage

 

No power to the ERV

Check for power at the disconnect

being supplied to the ERV matches the ERV's

 

switch

operating voltage. If the ERV operates on

 

 

 

 

 

three phase power check all three legs.

ERV will not turn on

 

 

Using a volt meter verify that the voltage on

 

One or more blown fuses

Check for power at the bottom of

the bottom side of the fuse block matches the

 

the fuse block

ERV's operating voltage. If the ERV operates

 

 

 

 

 

on three phase power check all three legs.

 

Control board transformer circuit

Look at the small transformer next

 

 

to the control circuit board to see if

Depress the circuit breaker back in.

 

breaker is tripped

 

the black circuit pushed out

 

 

 

 

 

The fan speed / CFM level is set

Use the user interface push button

Adjust the fan speed / CFM demand levels by

 

to view the 'Outside Air' and

pressing the user interface push button and

 

too low

 

'Exhaust Air' settings

turning the adjust knob.

 

 

 

 

 

Using a volt meter verify that the voltage on

 

One or more blown fuses

Check for power at the bottom of

the bottom side of the fuse block matches the

 

the fuse block

ERV's operating voltage. If the ERV operates

 

 

 

 

 

on three phase power check all three legs.

 

Rooftop Economizer Option (if

 

Using a continuity meter check for continuity

 

Check for continuity across the

across the two wires that connect to the mer-

ERV is running but

equipped) has shut down the ERV

mercury switch on the economizer

cury switch on the economizer damper. If the

blowers will not turn

because the rooftop unit is in 'Free

damper.

contacts are open, the rooftop unit is in 'Free

 

Cooling' mode

 

Cooling'.

 

 

 

 

Smoke Detector Option (if

 

Using the wiring schematics verify that the

 

equipped) has shut down the ERV

 

 

Check for wiring errors.

smoke detector is wired to the control board

 

because it is sensing smoke in the

 

properly.

 

exhaust airstream on the ERV.

 

 

 

 

 

 

Check to see if the outside temper-

Use a thermometer to measure the outside

 

Low Temperature Lockout Option

temperature. Use the wiring schematics to

 

(if equipped)

ature is above –30 F

verify that temperature probe on the intake air

 

(–34.4 C). Check for wiring errors

 

 

side of the ERV is wired properly.

 

 

 

 

The fan speed / CFM level is set

Use the user interface push button

Adjust the fan speed / CFM demand levels by

 

to view the 'Outside Air' and

pressing the user interface push button and

 

too low

 

'Exhaust Air' settings

turning the adjust knob.

 

 

 

Rooftop Economizer with Power

 

Using a continuity meter check for continuity

 

Relief Option (if equipped) has

Check for continuity across the

across the two wires that connect to the mer-

 

shut down the supply blower

mercury switch on the economizer

cury switch on the economizer damper. If the

Only one of the two

because the rooftop unit is in 'Free

damper

contacts are open, the rooftop unit is in 'Free

blowers is turning

Cooling' mode

 

Cooling'.

 

One of the blowers is wired

 

Using the wiring schematics verify that both

 

Check for wiring errors.

the power wires and the control wires are con-

 

incorrectly

 

 

nect properly.

 

 

 

 

The ERV Standard Frost Protec-

 

 

 

tion Option has turned off the sup-

Check for frost on the wheel.

Wait for Defrost mode to finish.

 

ply blower to defrost the wheel

 

 

 

The ERV Enthalpy Control, Dry

 

 

 

bulb Control / Wheel Bypass Stop /

Check for Stop / Jog movement of

Wait until sequence is completed.

 

Jog Option (if equipped) is

wheel.

 

 

 

activated

 

 

 

 

Check to see if the connector

 

 

The wheel motor is unplugged.

between the wheel motor and the

Plug the two connectors together.

 

cabinet wiring is securely

 

 

 

Blowers are on but

 

connected.

 

The wheel motor is wired

 

Compare the wheel motor, control board and

the wheel is not

Check for wiring errors.

incorrectly.

relay are wired correctly.

turning

 

The wheel belt is off or broken

Check the wheel belt.

Verify that the wheel belt is seated in the pul-

 

 

ley and on the rim of the wheel.

 

 

 

 

 

 

Carefully rotate the wheel by grabbing the

 

 

 

outer rim and spinnig the wheel. After letting

 

The air seals on the wheel are too

Check to see if the wheel spins

go the wheel should continue to spin for three

 

tight

freely.

to four seconds. Should the air seals need

 

 

 

adjusting see the maintainence section of this

 

 

 

book.

Copyright 2010 Carrier Corporation

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 04-53620007-01

Printed in U.S.A.

Form 62E-C1SI

Pg 38

8-10

Replaces: New

Page 37 Page 39
Image 38
Page 37 Page 39
Contents General ContentsSafety Considerations Physical Data SI Unit 62E Physical Data English Nominal Capacity cfm Supply/Exhaust Fan Options Physical Data English InstallationSupply/Exhaust Fan Options Physical Data SI FAN Option CodeERV RTUType A62-33062E Unit 62EL-62EU Unit Cabinet Dimensions A62-331A62-246ef A62-247efA62-376.eps Dimension Unit Type A62-377A62-378 A62-44362E2-62E7 Unit Cabinet Dimensions 62E Unit TypeInstall Standard Roof Curb 62E2-62E7 Unit Roof Curb Dimensions A62-44262EB-62EU Unit Horizontal Discharge Box Dimensions A62-379Make Electrical Connections A62-380Supply and Exhaust Fans Electrical Data Unit FAN Motor Option Chassis FLAElectric Heat Electrical Data Heater Unit and Heater 62E Chassis FLA62.83 Typical Wiring Schematic A62-383.eps Energy Recovery WheelSTART-UP Airflow vs. Pressure Drop Across ERV Wheel EpsFig Outside Air Cfm Screen Airflow VS. Pressure Drop Across ERV Wheel UnitEps Exhaust Air Offset Screen A62-388.epsFig Modulating CfmFalse True AWG Wiring Specifications Recommended Vendors and Part NumbersRmcorp CL2PUPC Open Controller NEC MS/TP Wiring RecommendationsSpecification Recommmendation Baud Selection Table SW3 Protocol Switch Settings For MS/TPUPC Communication Protocol Settings DIP Switches Network Points List Bacnet Point Name Read Object ID Write Object NameService A62-278ef Installing Wheel SegmentsA62-279ef A62-281ef Belt ReplacementA62-280ef A62-282efA62-284ef Pulley LocationA62-285ef MaintenanceReplacing a Blower 62EB and 62E7 Units Diameter Seal Adjustment A62-286efSymptom Possible Causes Action to Check Possible Remedy TroubleshootingERV Troubleshooting Page Application Coupled to RTU or stand-alone Specify RTU

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