5 DC-UC-WEB01
GAS VALVE
ORIFICE BURNER
MANIFOLD
MANUAL
ON/OFF
SWITCH
Regular Service Maintenance
Cooling and Heating Season
Basic Maintenance – For All Packaged Systems
To keep your unit operating safely and efficiently, a qualified
service technician should check the entire system seasonally,
and any other time that you feel a check is needed. Your service
technician may examine these areas of the unit:
1. Filters (for possible cleaning)
2. Motors (condenser and evaporator motors are
permanently lubricated)
3. Gaskets (for possible replacement)
4. Refrigerant coils (for possible cleaning)
5. Safety controls (for mechanical cleaning)
6. Electrical components and wiring (for possible
replacement and connection tightness)
7. Condensate drain (for possible cleaning)
8. Inspect the unit duct connections to see that they are
physically sound and sealed to the unit casing.
9. Inspect the unit mounting support to see that it is sound.
10. Inspect the unit to see that there is no obvious unit
deterioration.
Heating Season Additional Maintenance – For
Gas/Electric and Dual Fuel Packaged Systems
At the beginning of each heating season arrange for a qualified
service technician to complete the unit inspections and service
routines described in this section.
These steps should be performed ONLY by a qualified service
technician.
1. Inspect the control panel wiring and heating controls to make
sure connections are tight and wiring insulation is intact.
2. Check the operation of the gas ignition system.
a. Turn the unit on and off at the thermostat to be sure
the ignition control and spark electrode are operating.
b. Turn off the gas supply with the unit operating to
verify that the gas valve closes and that a re-ignition
cycle is initiated by the ignition control.
3. Check the burner manifold pressure. A pressure tap is
provided in the gas valve for this purpose.
4. Visually inspect all of the unit's flue product passageways
for excessive deposit buildup or corrosion. If buildup or
corrosion is apparent, perform the necessary repairs.
5. Visually check the main burner flames. They should be bright
blue flames extending up to the heat exchanger sections.
ELECTRIC SHOCK HAZARD
To prevent injury or death due to electrical shock or contact
with moving parts. Lock unit disconnect switch in open
position before servicing unit.
HAZARDOUS GASSES
Exposure to fuel substances, or by-products of incomplete fuel
combustion, is believed by the state of California to cause cancer,
birth defects, or other reproductive harm.
This warning complies with State of California law, Proposition 65.
This product must be gas piped by a Licensed Plumber or Gas
Fitter in the Commonwealth of Massachusetts.
ELECTRIC SHOCK HAZARD
Should overheating occur, or the gas supply fail to shut off, shut
off the manual gas valve to the furnace before shutting off the
electrical supply.
In the event that electrical, fuel or mechanical failures occur, the
owner should immediately turn off the gas supply at the manual
gas valve located in the burner compartment and electrical
power to the furnace and contact service technician.
GAS VALVE
Manual On/Off Switch
Figure 2. Gas Valve with On/Off "Toggle" Switch
IMPORTANT: Some of these products have been designed
and manufactured to meet ENERGY STAR criteria for energy
efficiency. However, proper refrigerant charge and proper
air flow are critical to achieve rated capacity and efficiency.
Installation of this product should follow the manufacturer’s
refrigerant charging and air flow instructions.
Failure to confirm
proper charge and airflow may reduce energy efficiency and
shorten equipment life.
For regular dealer maintenance please refer to
www.acca.org/industry/quality
