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DGAT series

Unitary products group DLAS Series, DGAM Series, DGAT series, DGPT series Use And Care Instruction

Use and Care Instructions
For
Gas Downflow Furnace
035--15875--301 (1198)
DLAS MODELS (No Coil Cabinet)
FORYOURSAFETY--Donotstoreoruseflam­mable liquids, vapors, or materials in the immediate area near the furnace or other heating appliance.
Improper installation, adjustment, alteration, service or maintenance can cause property damage, perĆ sonal injury or loss of life. Installation and service must be performed by a qualified installer, service agency or the gas supplier.
Never attempt to modify this furnace. Fire, exploĆ sion, or asphyxiation may result. If malfunction ocĆ curs, obtain the assistance of a qualified service agent.
DGAM, DGAT & DGPT MODELS (With Built--in Coil Cabinet)
Before placing furnace in service, it must be checked to make sure it is equipped for the type of gas being used. The burner flame must also be observed andadjusted if necesĆ sary. Failure to observe this caution may reĆ sult in unsafe operation, explosion, and/or fire or asphyxiation. See sections Gas SupĆ ply" and Combustion Air".
Use of furnace or air conditioning components that are not included in the Underwriter's LabĆ oratories certification of this appliance may create a hazard, will invalidate the certificaĆ tion, and will in many states make installation illegal. UL listed air conditioning components arespecifiedonthefurnacelabel.
WARRANTY AND RESPONSIBILITIES
It is the sole responsibility of the home owner to make certain that the gas furnace has beencorrectly set upand converted to the proper fuel (Propane or Natural gas) and adjusted to oper­ate properly.
The manufacturer warrants the fur­nace to be free fromdefectsinmateri­al or workmanship for the stated time in the warranty agreement (see war­ranty certificate packed with the fur­nace).
However, the manufacturer will not be responsible for any repair costs to correct problems due to improper set--up, improper installation, furnace adjustments, improper operating pro­cedure by the user, etc.
Some specific examples of service calls which cannot be included in war­ranty payments are:
1. Converting the furnace to use another type of gas.
2. Correcting faulty duct work in the home.
3. Correcting wiring problems in the electrical circuit to the furnace.
4. Resetting circuit breakers or oth­er switches.
5. Adjusting the burner air shutter or service calls made to correct problems caused by improper air adjustment.
6. Correcting problems caused by improper gas supply pressure to the furnace.
7. Instructional training on how to light and operate furnace.
8. Furnace problems caused by in­stallation of air conditioner, heat pump, or other air quality device which is not approved.
9. Problems caused by improper in­stallation of the furnace flue as­sembly (roof jack).
10. Adding a roof jack extension because of unusual wind condi­tions or snow conditions.
11. Adjusting or calibrating the ther­mostat.
12. Construction debris which has fallen into the flue or combustion air openings.
You should establish a firm under­standing of these responsibilities with your manufactured housing dealer, serv ice company or gas supplier so there will be nomisunderstanding at a later time.
GAS SUPPLY
The gas supply to your home will ei­ther be Natural Gas or Propane gas (bottle gas). Your furnace will be fac­tory equipped to operate on only one of these two different gases.
A small metal tag secured to the fur­nace next to the gas valve will specify thetypeofgasyourfurnaceis equipped to use.
If the gas is different from that speci­fied on the metal tag, the furnace can be converted by following the instruc­tions on the furnace safety label inside lower front panel. P arts for con­version are contained in the small cloth bag attached to the gas valve. Be sure the proper size orifice is used, as specified on the furnace name plate.
The furnace must be conĆ verted by a qualified techniĆ cian. Improper conversion can cause unsafe operation, explosion, and/or fire or asĆ phyxiation.
Natural Gas Operation
The furnace is designed for 7” W.C. inlet pressure. Pressure is reduced to 3 1/2” W.C. by the pressure regulator in the gas valve.
Propane Gas Operation
Inlet pressure to the gas valve must be 11”W.C. When properly converted to Propane gas, the pressure is regu­lated at 10” W.C.
SAFETY INFORMATION
For your safety read before lighting.
A. The first lighting of the furnace af-
ter any home setup must be per­formed by a qualified service technician.
B. If this appliance has a pilot that
must be lit by hand, follow these instructions exactly.
C. BEFORE LIGHTING smell all
around the furnace for gas. Be sure to smell next to the floor be­cause some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:
D Donottrytolightanyappliance.
D Do not touch any electric switch
and do not use any phone in your building.
D Immediately call your gas suppli-
er from a neighbor’s phone. Fol­low the gas supplier’s instruc­tions. If you cannot reach your gas supplier, call the fire depart­ment.
D. Use only your hand to push in the
gas control lever. Never use tools. If the lever will not push in by hand, don’t try to repair it. Call a qualified service technician. Force or attemptedrepairmay re­sult in a fire or explosion.
E. Do not use this furnace if any part
has been under water. Immedi­ately call a qualified service tech­nician to inspect the furnace and to replace any part of the control system and any gas control which has been under water.
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Unitary Products Group
INSTRUCTIONS FOR DGPT STANDING PILOT MODELS
LIGHTING INSTRUCTIONS
1. STOP! Read the SAFETY INĆ
FORMATION.
2. Set the thermostat to the lowest setting.
3. Turn off all electrical power to the appliance.
4. Remove the furnace doors.
5. Push in the gas control lever slightly and move right to “OFF”. DO NOT FORCE.
6. Wait ten (10) minutes to clear out any gas. Then smell for gas, in­cluding near the floor. If you smell gas, STOP! Follow “C” in the SAFETY INFORMATION. If you don’t smell gas, go to the next step.
7. Open hinged observation door, the pilot is foundat the end of the pilot shield on the left side of the burner.
8. Slightly depress the gas control lever and move it to the left to the “ON” position and release; then move it to the “PILOT” position.
9. Move the control lever to “SET” and hold. I mmediately light the pi­lot with a match (use match hold­er provided). Continue to hold the control lever for about one (1) minuteafterthepilotislit.Re­lease the lever and it will spring back to the “PILOT””position. Pi­lot should remain lit. If it goes out, repeat steps “5” through “9” above.
D If the lever does not spring back
when released, stopand immedi­ately call your service technician or gas supplier.
D If the pilot will not stay lit after sev-
eral tries, move the gas controlle­ver to “OFF” andcall your service technician or gas supplier.
10. Move the gas control lever to “ON”.
11. Replace the furnace doors.
12. Turn on all electric power to the furnace. Set the thermostat to “HEAT” and/or the desired tem­perature setting. Set the ON-­OFF--FAN switch to “ON”.
In the event of any flashback or exĆ plosion, immediately shut off the furnace and call your servicetechĆ nician.
To Turn off Gas to A ppl i ance
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance if service is to be per­formed.
3. Remove the furnace doors.
4. Move gas control switch to “OFF” position. DO NOT FOR CE.
5. Replace the furnace doors.
GAS CONTR OLCONTROL LEVER
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T
J
J
O
O
D
D
L
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PRESSURE REGULATING DEVICE
FIGURE 1 -- ROBERT SHAW
GAS VALVE
SEQUENCE OF OPERATION
1. On a call for heat, the thermostat contacts close, supplying 24 VAC to the gas valve.
2. Whenthegasvalveisenergized it steps open at a reduced flow and opens f ully after approxi­mately 10 seconds.
3. When the call for heat is satisfied the thermostat contacts open, thegasvalveshutoffgasflow.
THE FURNACE CONTROL S AND THEIR FUNCTION
1. “ON--OFF --FAN” switch turns electrical power to the furnace on and off. The switch must be set in the “ON” position for the furnace to operate. To run the blowercon­tinuously without heating, set the swi t ch to “FAN”.
2. Limit Control -- This furnace is protected by two (2) high temper­ature limit switches. The lower limitswitchisanautomaticreset type.
The upper limit switch near left side of blower is a manual reset type limit switch (See Figure 2). If burner does not function, turn system switch to OFF and push reset button in center of limit switch.
Chute to left of blower is hot. Use care when resetting limit switch to avoid burns to hand and arm.
If the upper limit switch trips again soon after resetting, turn the furnace System Switch to the OFF position and call your nearest authorized service techĆ nician.
UPPER LIMIT
SWITCH
(MANUAL
RESET)
BLOWER
SYSTEM SWITCH
AUTOMATIC
RESET LOWER
LIMIT SWITCH
HOTHOT
FIGURE 2 -- FURNACE CONTROLS
PILOT
ACCESS
DOOR
GAS VALVE
BURNER AIR
SHUTTER
ADJUSTMENT
ROD
3. Gas Valve -- The gas valve is 100% shut--off type and will fail safe if for some reason the gas is turned off or the pilot goes out. It is also of the modulating or “step-­open” type which means they open to a “low fire” position and after a few seconds “step--open” to “high fire”.
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