For 460-v GE Motors — The motor leads are color coded as follows:
3-SPEED | 2-SPEED |
black = high speed | black = high speed |
| |
violet = jumper | blue = jumper |
| |
orange = medium speed | --- |
| |
red = low speed | red = low speed |
| |
To change the speed of the blower motor (BM), remove fan motor speed lead from the blower relay (BR) and replace with the lead for the desired blower motor speed. The motor speed lead is attached to terminal BM. For low and medium speeds black must be connected to the jumper wire. Insulate removed lead end to avoid contact with chassis parts. To select high speed on 460-v GE motors, separate the black female quick connect (QC) from the jumper lead male quick connect (QC) and connect the black lead to the BR. Insulate the jumper to avoid contact with any chassis parts.
COOLING SEQUENCE OF OPERATION — With the room thermostat SYSTEM switch in the COOL position and the FAN switch in the AUTO. position, the cooling sequence of operation is as follows:
When the room temperature rises to a point that is slightly above the cooling control setting of the thermostat, the thermostat completes the circuit between thermostat terminal R to terminals Y and G. These completed circuits through the thermostat connect contactor coil (C) (through unit wire Y) and blower relay coil (BR) (through unit wire G) across the 24-v secondary of transformer (TRAN).
The normally open contacts of energized contactor (C) close and complete the circuit through compressor motor (COMP) to con- denser (outdoor) fan motor (OFM). Both motors start instantly.
The set of normally open contacts of energized relay BR close and complete the circuit through evaporator blower (indoor) fan motor (IFM).
NOTE: Once the compressor has started and then has stopped, it should not be started again until 5 minutes have elapsed.
The cooling cycle remains ‘‘on’’ until the room temperature drops to a point that is slightly below the cooling control setting of the room thermostat. At this point, the thermostat ‘‘breaks’’ the circuit between thermostat terminal R to terminals Y and G. These open circuits de-energize contactor coil C and relay coil BR. The condenser and compressor motors stop. After a 30-second delay, the blower motor stops. The unit is in a ‘‘standby’’ condition, waiting for the next ‘‘call for cooling’’ from the room thermostat.
MAINTENANCE
To ensure continuing high performance, and to minimize the possibility of premature equipment failure, periodic maintenance must be performed on this equipment. This combination heating/cooling unit should be inspected at least once each year by a qualified service person. To troubleshoot heating or cooling of units, refer to tables at the back of the book.
NOTE TO EQUIPMENT OWNER: Consult your local dealer about the availability of a maintenance contract.
WARNING: The ability to properly perform mainte- nance on this equipment requires certain expertise, me- chanical skills, tools, and equipment. If you do not possess these, do not attempt to perform any maintenance on this equipment other than those procedures recom- mended in the User’s Manual. FAILURE TO HEED THIS WARNING COULD RESULT IN SERIOUS IN- JURY AND POSSIBLE DAMAGE TO THIS EQUIP- MENT.
—19—
WARNING: Failure to follow these warnings could result in serious injury or death:
1.Turn off gas supply, then turn off electrical power to the unit before performing any maintenance or service on the unit.
2.Use extreme caution when removing panels and parts.
As with any mechanical equipment, serious injury can result from sharp edges, etc.
3.Never place anything combustible either on, or in contact with, the unit.
4.Should overheating occur, or the gas supply fail to shut off, shut off the external main manual gas valve to the unit, then shut off the electrical supply.
CAUTION: Errors made when reconnecting wires may cause improper and dangerous operation. Label all wires prior to disconnection when servicing.
The minimum maintenance requirements for this equipment are as follows:
1.Inspect air filter(s) each month. Clean or replace when necessary.
2.Inspect indoor coil, drain pan, and condensate drain each cooling season for cleanliness. Clean when necessary.
3.Inspect blower motor and wheel for cleanliness and check lubrication each heating and cooling season. Clean when necessary. For first heating season, inspect blower wheel bimonthly to determine proper cleaning frequency.
4.Check electrical connections for tightness and controls for proper operation each heating and cooling season. Service when necessary.
5.Check and inspect heating section before each heating season. Clean and adjust when necessary.
6.Check flue hood and remove any obstructions if necessary.
A. Air Filter
IMPORTANT: Never operate the unit without a suitable air filter in the return-air duct system. Always replace the filter with the same dimensional size and type as originally installed. See Tables 2 and 3 for recommended filter sizes.
Inspect air filter(s) at least once each month and replace (throwaway-type) or clean (cleanable-type) at least twice during each heating and cooling season or whenever the filter(s) becomes clogged with dust and lint.
B. Evaporator Blower and Motor
NOTE: All motors are pre-lubricated. Do not attempt to lubricate these motors.
For longer life, operating economy, and continuing efficiency, clean accumulated dirt and grease from the blower wheel and motor annually.
WARNING: Turn off the gas supply, then disconnect and tag electrical power to the unit before cleaning the blower motor and wheel. Failure to adhere to this warning could cause serious injury or death.
To clean the blower motor and wheel:
1.Remove and disassemble blower assembly as follows:
a.Remove unit access panel.
b.Disconnect motor lead from blower relay (BR). Discon- nect yellow lead from terminal L2 of the contactor.
