GE 7FA.05 - Heating, Cooling and Ventilation; Air Conditioners (Where Applicable); Space Heaters; Load, and Turbine Compartment Vent Fans

To Next Page

To Previous Page

Inspection and Maintenance Instructions for 7FA.05 Gas Onl

and Dual Fuel Gas Turbine

GEK 116862

V. HEATING, COOLING AND VENTILATION

A. Air Conditioners (where applicable)

Clean dust and dirt from the condenser and evaporative coils. Clean condensate drip pan and verify

proper condensate drain function. Wash or replace the air filter. Functionally check the operation of

the thermostat and air conditioner.

B. Space Heaters

Check electrical continuity and verify proper operation of the space heaters. Clean dust from the

thermostats, heating elements and fan blades. Lubricate the fan motors per the Vendor Supplied

Components Instructions.

C. Load, and Turbine Compartment Vent Fans

Check fan wheel for buildup of foreign material or excessive wear from abrasion. Both can cause

vibration and create a serious safety hazard. Any buildup of foreign material should be removed. If

wheel shows excessive wear, replace it immediately.

Check all set screws and bolts for tightness, and mounting security. Lubricate fan motors per the

Vendor Supplied Components Instructions.

D. Fuel and Turbine Compartment Louvers

During operation, check to ensure inlet louvers are operating. If a louver appears to be opening much

different than that of others then this should be addressed during the next shutdown.

Visual inspection of the area surrounding the louvers should be performed regularly to ensure no

inlets to the ventilation air are blocked. Ensure that unintended things are not passing through louvers

such as instrumentation wires, tubes or pipes, etc.

During shutdown the louvers should close automatically. If they do not close automatically then

adjustment of the counter weight position or other corrective action is required. Reference vendor

supplied component instructions for correct adjustment procedure.

VI. MOTORS

A. DC Motors

Inspect to ensure the brush orientation markings on the side of the brush yoke and bearing bracket are

aligned. If the brushes are not properly orientated, it could affect the speed of the motor and cause

excessive sparking. Check the indicator marker on the brush pigtails for evidence of brush wear. If

the marker reaches the top of the brush holder box, the brush is worn to the point where it should be

discarded. These checks can be made after removing the bearing bracket louvered cover.

Also check the commutator at this time for cleanliness and wear. Check the commutator for

roughness while running. This is done by placing a fiber stick against the brushes and feeling to see if

it jumps during rotation. Check the insulation and windings for contamination, mechanical defects

and temperature defects. Check the insulation integrity for electrical resistance.

Check the vibration of the motor while coupled to the pump. The vibration should not exceed 3 mils

(0.08 m). Check rpm of motor with mechanical or Reed type tachometer and compare to nameplate.