Bryant ERVBBSVA1100 Troubleshooting, Electrical Shock Hazard, Cut Hazard, High Speed, Low Speed

NOTE: The core should only be serviced when outdoor temperature is 60°F to 75°F (16°C to 24°C) and it is dry.

!CAUTION

UNIT COMPONENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

DO NOT use water to clean core or damage will result. In addition, before servicing or removing the core inspect the edges to see if they appear soft (or slightly expanded). This can be normal and due to moisture in the air. DO NOT handle or service core until it is dry or air passages can become damaged and/or closed.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Before installing or servicing system, always turn off main power to system. There may be more than 1 disconnect switch.

!CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing and gloves when handling parts.

TROUBLESHOOTING

NOTE: Reference Table 5 Troubleshooting Chart

This can be a quick guide in resolving unit problems. It is also recommended to review and understand Wall Control Board Operation and Care and Maintenance sections before continuing.

NOTE: If there is a short circuit or an open circuit at thermistor, CPU will go into a 5 minute defrost cycle every 20 minutes. This feature is not there on older board versions with 3 pin jumpers.

Override Test

To use override test function, a thermistor must be connected to the control board. Unit must not be in defrost mode during an override test.

High Speed

1. Disconnect ERV/HRV from 115VAC.

1.Unplug wall control wires at control module terminal block in- side ERV/HRV.

2.Plug ERV/HRV back to 115VAC.

3.Attach a wire across J3-8 and J3-9 (B and G) on control mod- ule terminal block.

4.Close door, this will initiate a high-speed exchange.

Low Speed

1.Unplug ERV/HRV from 115VAC.

2.Disconnect wall control wires at control module terminal block inside ERV/HRV.

3.Plug ERV/HRV back to 115VAC.

4.Connect a 3.0 K ohm resistor between B and G on control module terminal block.

5.Close door, this will initiate a low-speed exchange.

Blower Speed Selection

Three-speed blowers are factory connected to electronic control board on HIGH- and LOW-speed taps of blowers. Installer can easily change low-speed tap to medium-speed tap so electronic control will select between high and medium speed. Connections can be changed at motor location.

To change low speed to medium speed, proceed as follows:

1.Unplug unit from 115VAC.

2.Locate blower assembly.

3.Locate red wire an blue wire coming from blower assembly.

4.Unplug red wire from quick connect.

5.Unplug protecting cap quick connection from blue wire and put on red wire coming from blower. The cap is a safety insula- tor.

6.Connect red wire of main harness to blue wire.

7.Replace wires.

ERV / HRV

9