Broan-NuTone ERV200TE Sky Energy Recovery Ventilator Installation Guide

Installation Guide for Broan-NuTone models including: ERV200TE, ERV100S, ERV200TE Sky Energy Recovery Ventilator, ERV200TE, Sky Energy Recovery Ventilator, Energy Recovery Ventilator, Recovery Ventilator, Ventilator

2. INSTALLATION (CONT'D)

Installation Manual

Broan-NuTone Sky Energy Recovery Ventilator (ERV), Side Port - ERV200TE

[PDF] 2. INSTALLATION (CONT'D)

Turn off all exhaust devices such as range hood, dryer and bathroom fans. ... NOTE: Both units start in defrost mode within the first minute of operation.

File Info : application/pdf, 10 Pages, 3.90MB

broan erv100s installation manual 1

2. INSTALLATION (CONT'D)

2.8 insTalling 2 exTerior Hoods
! WARNING
Make sure intake hood is located at least 10 feet away from any of the following: · Dryer exhaust, central vacuum vent · Gas meter exhaust, gas barbecue-grill · Any exhaust vents or chimney from a combustion source · Garbage bin and any other source of contamination such as parking lots,
streets For multifamily buildings only:
Make sure exhaust hood is located at least 3 feet away from any of the following:
· Property lines · Operable openings into buildings (door, window)

EXHAUST HOOD

INTAKE HOOD B

OPTIONAL DUCT

LOCATION

TAPE AND DUCT TIE

· Intake and exhaust hood(s) shall be protected with corrosion-resistant screens, louvers or grilles having openings not less than 1/4 inch and not larger than 1/2 inch.

CAULKING

· Install hood(s) at least at 18 inches away from the ground OR depth of expected snow accumulation, whichever is greater.
To minimize cross-contamination of exhausted stale air into the fresh air intake: Single detached, attached homes and townhouses: · Maintain a 6 feet minimum separation distance between outdoor air intake and
exhaust hoods OR use an approved factory-built intake/exhaust combination termination fitting. Multifamily buildings: · Maintain a 10 feet minimum separation distance between outdoor air intake and exhaust hoods OR use an approved factory-built intake/exhaust combination termination fitting. Ignoring these recommendations could significantly degrade the quality of the incoming air which, in some cases, could result in health consequences. In the event of a conflict between our recommendations and any local requirements, the latter shall have priority.

VD0028
Legend: A - Single family 6 ft
Multifamily 10 ft B - 18" or depth of expected snow accumulation
Refer to figure above for connecting insulated ducts to the exterior hoods. An "Anti-gust intake hood" should be installed in regions where a lot of snow is expected to fall.

2.9 insTalling a Tandem® TransiTion* kiT
CAUTION If using a Tandem Transition, a backdraft damper must be installed on the stale air to outdoors duct. If this causes an interruption in the duct insulation, insulation must be added around the backdraft damper to avoid condensation.
If desired, a Tandem transition kit can be used instead of 2 exterior hoods. · An additional backdraft damper (not included) must be installed on the stale air to outdoors duct following common best
practice. Should the backdraft damper cause an interruption in the insulation of the stale air to outdoors duct, make sure that insulation is added around the backdraft damper to avoid condensation. · Follow the instructions included with the tandem termination kit. *Patented.

VR0003
Tandem VTYIK1

VR0021
Tandem V14695
11

3. CONTROLS
The ERV100S unit is equipped with an integrated control. The electronic device is located under the unit, in front of the electrical compartment. Refer to the figure at right for steps 3.1 up to 3.4. Plug the unit.

1 2

3.1 BooTing sequence

VC0152

The unit booting sequence is similar to a personnal computer boot sequence. Each time the unit is plugged after being unplugged, or after a power failure, the unit will perform a booting sequence before starting to operate.

During the booting sequence, the integrated control LED (1 in above illustration) will light up and remain GREEN or AMBER for 3 seconds, and will then shut off*; the booting sequence is done. * or will light up in the color of the previous mode to show the unit resumed to it, if the unit is controlled by its integrated control. NOTE: No command will be taken until the unit is fully booted.
If a problem occurs during the unit operation, or if the unit turns in Protection Mode, its LED (1) will blink. The color and the blinking pattern depend on the type of error detected, or if the unit is in Protection Mode. Refer to the sticker on the unit and Section 9 Troubleshooting on page 22 for further details.

3.2 inTegraTed conTrol
Use the push button (2) to control the unit. The LED (1) will then shows on which mode the unit is in. Refer to table at right. NOTE: When using main control, the integrated control
must be turned off.

LED COLOR AMBER GREEN no ligHT

RESULTS uniT is on loW speed uniT is on HigH speed uniT is oFF or conTrolled By a main conTrol

3.3 seTTing exTended deFrosT

These units are factory set to normal defrost. In cold region (outdoor temperature -17°F and lower), it may be necessary to setup extended defrost. During the first 3 seconds of booting sequence, the integrated control LED shows the current defrost mode (refer to table at right).

LED COLOR GREEN AMBER

DEFROST MODE normal exTended

Within the first 3 seconds of booting sequence, press on push button until the LED starts to blink, then release the push button; the LED will blink AMBER 5 times. After that, the LED will shut off, then turn RED (the unit returns in its booting sequence).

3. CONTROLS (CONT'D)
3.4 elecTrical connecTion To Wall conTrols For more convenience, the ERV100S unit can also be controlled using an optional main control. NOTES: 1. The integrated control must be turned OFF to use an optional main control. 2. If an optional auxiliary control is used, if activated, this auxiliary control will override the optional main control operation.
! WARNING Always disconnect the unit before making any connections. Failure in disconnecting power could result in electric shock or damage of the wall control or electronic module inside the unit.
CAUTION Never install more than one main wall control per unit. Make sure that the wires do not short-circuit between themselves or by touching any other components on the wall control. Avoid poor wiring connections. To reduce electrical interference (noise) potential, do not run wall control wiring next to control contactors or near light dimming circuits, electrical motors, dwelling/building power or lighting wiring, or power distribution panel.

Open the unit door. Insert the terminal connector (included in the installation kit) under the unit, on the electrical compartment front face. Use this terminal connector to perform the electrical connection for main and optional wall controls, then secure the cable(s) with a tie wrap (see illustration at right).

VE0297

TIE WRAP

B
A
Check if all wires are correctly inserted in their corresponding holes in the terminal block. (A wire is correctly inserted when its orange receptacle is lower than another one without wire. On illustration at right, wire A is correctly inserted, but not wire B.) Splice back the end of the cable to access the 4 wires. Strip the end of each wire. Connect each wire to its corresponding terminal: YELLOW wire to "Y',' RED wire to "R',' GREEN wire to "G'' and BLACK wire to "B'.' Connect the auxiliary control cable, if installed (not shown).

VE0272

3. CONTROLS (CONT'D) 3.4 elecTrical connecTion To Wall conTrols (conT'd)
3.4.1 elecTrical connecTion To VT7W main Wall conTrol
NO C NC I OC OL Y R G B

VE0250
3.4.2 elecTrical connecTion To VT4W main Wall conTrol

NO C NC I OC OL Y R G B Y GB

VT4W
main Wall conTrol rear VieW
Y GB

3.4.3 elecTrical connecTion To VT6W main Wall conTrol

NO C NC I OC OL Y R G B

#XXXXX CO M FO R T Z ON E

01/98

5°C 41 ° F

-5 ° C

23 ° F

-20°C -4°F

OFF MIN MAX

VE0328A
3.4.4 elecTrical connecTion To opTional auxiliary Wall conTrols (VBaTHW and VB20W)

VE0370

NOTE: If an optional auxiliary wall control is activated, this NO C NC I OC OL Y R G B control will override the main wall control commands.

VBaTHW or VB20W

VE0482
Once the wall control(s) connections have been made and checked, close the unit door. NOTE: For information about the operation of the wall controls, refer to the Main and auxiliairay wall controls user guide.

4. ELECTRICAL CONNECTION TO THE FURNACE

! WARNING
Never connect a 120-volt AC circuit to the terminals of the furnace interlock (standard wiring). Only use the low voltage class 2 circuit of the furnace blower control.

For a furnace connected to a cooling system:
On some older thermostats, energizing the "R" and "G" terminals at the furnace has the effect of energizing "Y" at the thermostat and thereby turning on the cooling system. If you identify this type of thermostat, you must use the alTernaTe Furnace inTerlock Wiring.

STANDARD FURNACE INTERLOCK WIRING

ALTERNATE FURNACE INTERLOCK WIRING

UNIT TERMINAL CONNECTOR
NO C NC I OC OL Y R G B
UNIT TERMINAL CONNECTOR
NO C NC I OC OL Y R G B

FOUR WIRES TWO WIRES heating only
W

THERMOSTAT

G Y TERMINALS

R
G C Y
FURNACE 24-VOLT TERMINAL BLOCK

TWO WIRES

VE0108A

COOLING SYSTEM

4 WIRES 2 WIRES heating only
W
R R G C Y Y

G Y THERMOSTAT

TERMINAL

wiring nuts
NO NC
C

FURNACE 24-VOLT TERMINAL BLOCK

2 WIRES

COOLING SYSTEM

5. SPEED SELECTION

The factory set high speed value for theses units is 100 CFM, and low speed value is approximately 50 CFM. To change these values, the transformer wire taps connections must be changed (see table and illustration below).

High Speed Low Speed

Speed 100 CFM 85 CFM 65 CFM 50 CFM

Connection BL-BL BN-BL GY-R R-R

JU1 Jumper H (1-2) M (2-3)

BK
R GY BN BL

BL BN GY R

120 V 103 V
76 V 64 V 55 V

T1
24 V Class 2
9.5 V Class 2

neutral
W

R
NC NC
BL

LOW SPEED HIGH SPEED

YO YO

COLOR CODE

BK BLACK O ORANGE

BL BLUE R RED

BN BROWN W WHITE

G GREEN Y YELLOW

GY GREY

NC NO CONNECTION

R GY BN
BL

R
NC NC
BL

VE0426A

1
2 J5
3

2 1

J8
54 32 1 MH
JU1 32 1

2 1

432 1

2 J4
3

3AG TYPE F1

J10

J11
12

J20
12

J12

J13

J14
10 9 8 7 6 5 4 3 2 1

1 23 4 5

ICP

ELECTRONIC A1 ASSEMBLY

6. WIRING DIAGRAM
! WARNING · Risk of electric shocks. Before performing any maintenance or servicing, always disconnect the unit from its
power source. · This product is equipped with an overload protection (fuse). A blown fuse indicates an overload or a short-circuit
situation. If the fuse blows, unplug the product from the outlet. Discontinue using the unit and contact technical support.

VE0437A

WIRING DIAGRAM

LOGIC DIAGRAM

ref: 24600_REV-A

Critical characteristic.

BK
R GY BN BL

BL BN GY R

120 V 103 V
76 V 64 V 55 V

T1
24 V Class 2
9.5 V Class 2

neutral
W
R
NC NC
BL

YO YO

NOTES
1. Protected against fire with UL listed/CSA Certified line fuse.
2. If any of the original wire, as supplied, must be replaced, use the same equivalent wire.
3. Field wiring must comply with applicable codes, ordinances and regulations.
4. Remote controls (class 2 circuit) available, see instruction manual.
5. Furnace fan circuit must be class 2 circuit only.

DOOR INTERLOCK SWITCH S1 (OPTIONAL, MAGNETICALLY
ACTUATED REED SWITCH)

R2 THERMISTOR

LINE
J10-2

F1 1 2 3

JU1

J9-2 J9-3

120 VAC
K1
J5-1

EXHAUST FAN MOTOR M1
M

NEUTRAL
J10-1
J5-2

C1 MOTOR CAPACITOR

J7-1 J7-2

J5-3

K3 J4-1

SUPPLY FAN MOTOR M2
M

J4-2

C2 MOTOR CAPACITOR

M1
EXHAUST FAN MOTOR

BK BL BN

C1
MOTOR CAPACITOR

C2 MOTOR CAPACITOR
M2
SUPPLY FAN MOTOR

BK BL
BN

120 VAC 60 Hz

1
2 J5
3

2 1

J8
54 32 1 MH
JU1 32 1

2 1

4 32 1

2 J4
3

3AG TYPE
F1 J10

J11
12

J20
12

J12

J13

J14

BK B

FIELD WIRING
REMOTE CONTROL
OVERRIDE SWITCH (OPTIONAL)
FURNACE BLOWER INTERLOCK (OPTIONAL)

ICP

ELECTRONIC A1 ASSEMBLY

BK G
W

M3 DAMPER MOTOR

OPTIONAL DAMPER SYSTEM R1 THERMISTOR

COLOR CODE

BK BLACK O ORANGE

BL BLUE R RED

BN BROWN W WHITE

G GREEN Y YELLOW

GY GREY

NC NO CONNECTION

R1 OR
THERMISTOR (OPTIONAL)

BK BK J2
54321 12
J3

J1 21
A2

1 23 4 5 103 VAC 76 VAC 64 VAC 55 VAC

J9-1

J6-1 J6-2

J4-3

NC NC

J9-4

T1
9.5 VAC
J8-5
J8-4

24 VAC
K4 J8-2

OPTIONAL DAMPER SYSTEM

J12-1 J2-1 J3-1

DAMPER MOTOR M3
M

J8-1

J12-2 J2-2 J3-2

J11-2 J11-1

K1 K2 K3 K4 K5

CPU

LINE VOLTAGE FACTORY WIRING
CLASS 2 LOW VOLTAGE FACTORY WIRING CLASS 2 LOW VOLTAGE FIELD WIRING

DAMPER ELECTRONIC ASSEMBLY

7. BALANCING THE UNIT 7.1 WHaT you need To Balance THe uniT

·A magnehelic gauge capable of measuring 0 to 0.5 inch of water (0 to 125 Pa) and 2 plastic tubes.
·The balancing chart located on the unit door.

VP0009
7.2 preliminary sTages To Balance THe uniT

·Seal all the unit ductwork with tape. Close all windows and doors.

·Turn off all exhaust devices such as range hood, dryer and bathroom fans.

·Make sure the integrated balancing dampers are fully open. Both are located on the Exhaust air to

outdoor port and on Fresh air from outdoor port (see step 2.2). Ensure that the lever rotation won't

exceed 90° maximum to avoid the damper not closing properly.

·Make sure all filters are clean (if it is not the first time you balance the unit).

VR0113

90° max.

Make sure the unit is not running in defrost mode while balancing.
When the outdoor temperature is below 32°F, the defrost mode can be activated. During defrost cycle, it is not possible to balance the unit since there is no flow in one direction.
To cancel the defrost cycle, use the auxiliary control or jump OC-OL on unit terminal block; this will set the unit on high speed ventilation without defrost for the next 20 minutes. Once the 20 minutes of high speed ventilation is completed, the unit will perform an extended defrost. If installed, do not forget to remove the jumper between OL and OC on terminal block. Another way to avoid the defrost cycle is to wait 10 minutes after plugging the unit in; this procedure ensures that the unit is not in a defrost cycle.
NOTE: Both units start in defrost mode within the first minute of operation.

7.3 Balancing procedure

1. Set the unit to high speed.

Make sure that the furnace/air handler blower is ON if the installation is in any way connected to the ductwork of the cold air return. If not, leave furnace/air handler blower OFF.

2. Place the magnehelic gauge on a level surface and adjust it to zero.

3. Connect tubing from gauge to exhaust air flow pressure taps and fresh airflow pressure taps (see diagram at right).

Be sure to connect the tubes to their appropriate high/low fittings. If the gauge drops below zero, reverse the tubing connections.

4. Measure both flows; adjust higher flow to equal the lower one, using

balancing damper lever.

VP0033A

HIGH

FRESH AIRFLOW

LOW

HIGH

LOW

EXHAUST AIRFLOW

CAUTION When loosing or tightening the damper lever locking screw, never use an electric screwdriver or drill, use a standard screwdriver.
VR0086
CAUTION Make sure to turn the damper lever to the right direction (opposite to its stopper, see illustration at right). Securing the lever in wrong position may cause freezing into the unit.
VD0333
5. Secure both damper levers in place using their locking screw, then shut all the pressure taps with the small plastic plugs included in the hardware kit.
6. Write the required air flow information on a label and stick it near the unit for future reference (date, maximum speed air flows, your name, phone number and business address). NOTE: The unit is considered balanced even if there is a difference of ±10 cfm between the two air flows.
17

8. SERVICE PARTS

1 2
3 45

18 17
16
10 9

14
13 15

6
VL0066

11 12

NO.

DESCRIPTION

1 insTallaTion BrackeTs kiT (2)

2 Balancing and BackdraFT damper porT kiT

3 5" meTal porT kiT For cold side

4 adjusTaBle porT kiT

5 door meTal keepers and laTcHes kiT

6 cold side BloWer kiT (incl. 1 capaciTor)

7 Warm side BloWer kiT (incl.1 capaciTor)

8 Warm side THermisTor

9 TransFormer kiT

10 capaciTors 5 F (2)

11 elecTronic Board kiT

12 magneT WiTH BrackeT kiT

13 door assemBly

FilTer kiT (2) 14
opTional merV 8 FilTers (2)

15 erV core

16 core locking deVice kiT

17 5" meTal porT kiT For Warm side

18 door meTal Hinges kiT (2)

* Terminal connecTor

* cold side THermisTor kiT

* opTional HardWare kiT * noT sHoWn.

PART NO. SV61240 SV61219 SV61236 SV61215 SV61218 SV61235 SV61234B SV61233 SV61232 SV16042 SV61230 SV61241 SV63498 SV21029 V21030 SV61223 SV61237 SV61217 SV61228 SV16416 SV61221 V61239

ERV100S 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 1 1 1

REPLACEMENT PARTS AND REPAIR
In order to ensure your ventilation unit remains in good working condition, you must use the Broan-NuTone LLC genuine replacement parts only. The Broan-NuTone LLC genuine replacement parts are specially designed for each unit and are manufactured to comply with all the applicable certification standards and maintain a high standard of safety. Any third party replacement part used may cause serious damage and drastically reduce the performance level of your unit, which will result in premature failing. Also, Broan-NuTone LLC recommends to contact a Broan-NuTone LLC certified service depot for all replacement parts and repairs.

9. TROUBLESHOOTING

If the unit does not work properly, reset the unit by unplugging it for one minute and then replug it. If it still not working properly, refer to table below.

If the LED of the unit is flashing, this means the unit sensors have detected a problem. See the table below to know where the problem occurs on the unit.

LED SIGNAL

ERROR TYPE

ACTION

UNIT STATUS

LED flashes GREEN (double blink every 2 seconds).
LED flashes GREEN (2 blinks per second; faster blink).
LED flashes RED (one blink every 2 seconds).
LED flashes RED (2 blinks per second; faster blink).

Outdoor thermistor error.

· Ensure J12 connector is properly connected Unit works but will defrost and its wires are not damaged. If they are frequently. correct:
· Replace the fresh air from outdoor thermistor.

Building side thermistor error. · Ensure J20 connector is properly connected Unit does not work. and its wires are not damaged. If they are correct:
· Replace the thermistor in the warm side blower.

Cold side motor error, open door or magnetic switch bad contact.

· Using a flat blade screwdriver, jump J11 while Unit does not work. pushing once on push button at the same time. If the LED is still flashing, go to point 8 in next table for motor diagnosis.

Unit is on protection mode or is in error because it has been in protection mode for an abnormal time.

· If outdoor temperature is colder than -13°F, it Unit exhaust air without

could be normal for the unit to enter in entering fresh air for

protection mode.

a 2-hour period, then

· To see if the unit is in error, wait 5 minutes, resume to its previous

unplug the unit, wait 1 minute and plug it back. operation mode and stops

Wait for the booting sequence to be done, then flashing RED. If LED

see if it still shows this error. If yes, press and continues to flash RED

hold the push button during 7 seconds to reset when back to previous

this error. Another LED signal can happen; mode, the unit is in error.

refer to the appropriate LED color code and Go to point 9 in next table.

blinks. If no, go to point 9 in next table.

! WARNING Risk of electric shocks. Electronic board connections must be checked by qualified personnel only.

PROBLEMS

POSSIBLE CAUSES

YOU SHOULD TRY THIS

· Unit not compatible with control.

· Check table on page 2 for control compatibility.

The error code E1 is displayed on VT8W or VT7W wall control screen.

· The wires may be in reverse position.
· The wires may be misconnected. · The wires may be broken.

· Ensure that the color coded wires have been connected to their appropriate places.
· Ensure the wires are correctly connected. · Inspect every wire and replace any that is damaged. If wires

are hidden into walls, test the control using a shorter wire.

NOTE: At its very start-up or after a power failure, it takes some

minutes before the outdoor temperature appears on

There is no outdoor

screen. The shortest delay is obtained when the wall

temperature displayed on
__VT8W wall control screen .

· The unit is in error.

control is set on MIN or MAX in VENT Mode. · Check the unit LED to see if it is flashing; if so, refer to the
previous table.

· RED wire in control cable damaged · Ensure the RED wire is not damaged and properly connected.

or misconnected.

VT8W or VT7W wall

control screen alternates between normal display

and E3.

· The VT8W or VT7W wall control may be defective.

· Replace the VT8W or VT7W wall control.

The main wall control does not work.

· Unit integrated control set to low

· Press on the integrated push button until the LED turns off.

or high speed (AMBER or GREEN

continuous LED).

· Unit not compatible with control.

· Check table on page 2 for control compatibility.

· The wires may be in reverse position. · Ensure that the color coded wires have been connected to

their appropriate places.

· The wires may be misconnected. · Ensure the wires are correctly connected.

· The wires may be broken.

· Inspect every wire and replace any that are damaged.

· Defective wall control.

· Replace the wall control.

9. TROUBLESHOOTING (CONT'D)

PROBLEMS

POSSIBLE CAUSES

YOU SHOULD TRY THIS

Unit does not work (LED not lit on power up).

· Unit is unplugged.

· Make sure the unit is plugged.

· No power to power outlet.

· Test the power outlet with another electrical device (e.g.: a

lamp). If it does not work, call an electrician.

· The fuse may be defective.

· Unplug the product from the outlet. Check if fuse F1 (located

on the PCB) is blown. In that case, discontinue using the

unit and contact technical support.

· J10, J9, or J8 connector(s) may be · Check the connection of J10, J9, and J8 connector(s).

unplugged.

· The transformer may be defective · With unit powered and J9 connected, check if there is about

(no 9.5 VAC between J8-4 and J8-5). 9.5 VAC between transformer connector J8-4 and J8-5

(YELLOW wires). If no, change the transformer.

· The PCB may be defective.

· Unplug the unit. Disconnect NO C NC I OC OL Y R G B the main control and the

auxiliary control(s) (if need

be). Jump G and B terminals. VE0097

Plug the unit back and wait about 10 seconds. If the motors

run on high speed and the damper opens, the circuit board

is not defective.

· The wires may be in reverse postion. · Ensure that the color coded wires have been connected to

their appropriate places.

· The wires may be misconnected. · Ensure the wires are correctly connected.

· The wires may be broken.

· Inspect every wire and replace any that is damaged. If wires

The auxiliary control does not work.

· The auxiliary control may be defective.

are hidden into walls, test the control using a shorter wire. · Jump the OL and OC NO C NC I OC OL Y R G B
terminals. If the unit switch

to high speed, remove the

auxiliary control and test it right VE0098

beside the unit using another shorter wire. If it works here,

change the wire. If it doesn't, change the auxiliary control.

A. The supply motor does not work, but exhaust motor works.

· The supply motor may be defective.
· The supply motor capacitor or the PCB may be defective.

· Plug supply motor to J5 connector and exhaust motor to J4 connector. If the LED flashes RED, the supply motor is defective. If exhaust motor works, plug back supply motor to J4 connector and exhaust motor to J5 connector, then check for supply motor capacitor validity.
· Plug supply motor capacitor to J7 connector and exhaust motor capacitor to J6 connector. If the LED flashes RED, the supply motor capacitor is defective. If there is no change, the PCB is defective.

· The exhaust motor may be defective. · Plug exhaust motor to J4 connector and supply motor to

J5 connector. If supply motor works but exhaust motor does

not, exhaust motor is defective. If exhaust motor works, plug

back supply motor to J4 connector and exhaust motor to J5

connector, then check for exhaust motor capacitor validity.

B. The LED flashes RED.

· The exhaust motor capacitor may be · PlugexhaustmotorcapacitortoJ6connectorandexhaustmotor

defective.

capacitor to J7 connector. If exhaust motor works but supply

motor does not, the exhaust motor capacitor is defective. If

there is no change, check validity of transformer or PCB.

· Tranformer wire(s) bad connection. · Check J8 and J9 connectors, as well as BLUE and RED

wire connections from J9.

· The transformer or the PCB may be · Move JU1 jumper from pins 2 and 3 to pins 1 and 2. Set the

defective.

unit on high speed. If exhaust motor works, the transformer

is defective. If it still does not, change the PCB.

· Wrong selection of defrost cycle.

· Refer to Section 3.2 or 3.4, according to the unit model.

· Defective motor or damper.

· Inspect the complete unit, make sure both motors are

running, make sure the damper system closes and seal

Unit shows protection

properly.

8 mode error (different than · Staleairflowchoked(unbalancedunit, · Inspect the complete ducting, clean the filters, stale air

being in protection mode). filters or outdoor port clogged, etc.). inside grille, etc., balance the unit).

· Inside temperature too low (around · Unit is using the inside temperature to defrost itself, so a very

64°F).

low room temperature can harm the defrost system of the unit.

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