These furnaces comply with requirements embodied in the American National Standard / National Standard of Canada ANSI Z21.47·CSA-2.3 Gas Fired Central Furnaces. ® US C INSTALLATION & OPERATING INSTRUCTIONS for GMS8, GDS8 and GHS8 GAS FIRED WARM AIR FURNACE SINGLE STAGE (CATEGORY 1) RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION. ATTENTION INSTALLING PERSONNEL As a professional installer you have an obligation to know the product better than the customer.
Table of Contents I. Warnings .......................................................................................................................................................................... 3 TO THE OWNER ................................................................................................................................................ 4 TO THE INSTALLER ...................................................................................................................................
Table of Contents XII. Start-up Procedure and Adjustment ......................................................................................................................... 21 FURNACE OPERATION ........................................................................................................................................ 21 FURNACE START-UP ..........................................................................................................................................
TO THE INSTALLER WARNING Before installing this unit, please read this manual thoroughly to familiarize yourself with specific items which must be adhered to, including but not limited to: unit maximum external static pressure, gas pressures, BTU input rating, proper electrical connections, circulating air temperature rise, minimum or maximum CFM, and motor speed connections, and venting. These furnaces are designed for Category I venting only.
4. Discharge your body to ground before removing a new control from its container. Follow steps 1 through 3 if installing the control on a furnace. Return any old or new controls to their containers before touching any ungrounded object. WARNING TO PREVENT POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK, THE FURNACE MUST BE LOCATED TO PROTECT THE ELECTRICAL COMPONENTS FROM WATER. III.
• Provisions must be made for venting combustion products outdoors through a proper venting system. The length of flue pipe could be a limiting factor in locating the furnace. • Ensure adequate combustion air is available for the furnace. Improper or insufficient combustion air can expose building occupants to gas combustion products that could include carbon monoxide. Refer to Section V, Combustion and Ventilation Air Requirements. • The furnace must be level.
Refer to subbase instructions for installation details. Follow the instructions with the subbase for proper installation. Do not install the furnace directly on carpeting, tile, or other combustible material other than wood flooring. (Note: The subbase will not be required if an air conditioning coil is installed between the supply air opening on the furnace and the floor.) FURNACE SUSPENSION If suspending the furnace from rafters or joist, use 3/8" threaded rod and 2”x2”x3/8” angle iron as shown below.
Corrections must be in accordance with the latest edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1 and/or CAN/CSA B149 Installation Codes. If this furnace is to be installed in the same space with other gas appliances, such as a water heater, ensure there is an adequate supply of combustion and ventilation air for the other appliances.
Space, Unconfined. Chimney or Gas Vent Ventilation louvers (each end of attic) For purposes of this Code, a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed through openings not furnished with doors, are considered a part of the unconfined space.
4. When ducts are used, they shall be of the same crosssectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall not be less than 3 inches. NOTE: The single opening must have a free area of not less than one square inch per 3000 BTU of the total input rating of all equipment in the enclosure, but not less than the sum of the areas of all vent connectors in the confined space. VI.
Venting VII. EXTERIOR MASONRY CHIMNEYS CATEGORY I FURNACES ONLY THIS FURNACE IS NOT DESIGN CERTIFIED TO BE HORIZONTALLY VENTED. An exterior masonry chimney is defined as a “Masonry chimney exposed to the outdoors on one or more sides below the roof line.” The ability to use a clay lined masonry chimney depends on a parameter not associated with interior chimneys. This variable is the geographic location of the installation.
Proper Chimney Termination? (Check 1) No Line, terminate with listed vent cap (Fix 1) No Change venting arrangements (Fix 2) No Rebuild crown (Fix 3) and/or Reline (Fix 4) No Reline (Fix 4) No Reline (Fix 4) No Reline (Fix 4) Yes Chimney channel free of solid and liquid fuel appliances? (Check 2) Yes Crown in good condition (Check 3) Yes Cleanout free of debris? (Check 4) Termination 10 Feet Or Less From Ridge, Wall or Parapet Yes Liner in good condition? (Check 5) Yes Dilution air avail
If a metal liner is not present, a clay tile liner must be present, or the chimney must be lined (Fix 4). CHECK 3 - CHIMNEY CROWN CONDITION. Damage from condensate usually shows up first in the crown. If any of the following trouble signs are present, the condition of the crown is not satisfactory: a) b) c) d) e) f) Use a flashlight and small mirror at the cleanout or vent connector to inspect the clay tile liner.
• If the combustion air supplied to the furnace will be contaminated with compounds containing chlorine or fluorine, a liner of AL294C stainless steel should be used. Common sources of chlorine and fluorine compounds include indoor swimming pools and chlorine bleaches, paint strippers, adhesives, paints, varnishes, sealers, waxes (which are not yet dried) and solvents used during construction and remodeling. Various commercial and industrial processes may also be sources of chlorine/ fluorine compounds.
JUNCTION BOX RELOCATION CAUTION WARNING LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.
• • • • • WARNING TO AVOID THE RISK OF INJURY, ELECTRICAL SHOCK OR DEATH, THE FURNACE MUST BE ELECTRICALLY GROUNDED IN ACCORDANCE WITH LOCAL CODES OR, IN THEIR ABSENCE, WITH THE LATEST EDITION OF THE NATIONAL ELECTRIC CODE. Wrap the “R” leg around a clip-on amp meter 10 times. Energize the furnace in the heat mode. Record the reading. Divide this reading by 10. Set the heat anticipator on the thermostat to match this reading. Example: If the reading on the amp meter is “4”, divide this by 10.
Furnace 2 Furnace 1 24 VAC HUM 1. 24 VAC Hum - A ¼” piggy back quick connect terminal on the pressure switch provides 24 VAC humidifier control. This terminal will be powered any time the pressure switch is closed. To connect 24 VAC hum, connect 24vac line of humidifier to piggyback on the pressure switch. The com side of the humidfier to C on the terminal strip on the control board (or to com side to 24VAC transformer). Do not connect 115V humidifier to these terminals.
using a heating value of approximately 1,000 Btu/hr, and should not normally require change. Most cases will not require a change at altitudes up to 7,500 feet. For use at altitudes in excess of 4,500 feet, refer to the following table for maximum input rates based on altitude. Contact your local gas utility for the heating value of the gas. Refer to National Fuel Gas Code ANSI Z223.1 and the following section to calculate firing rates.
This unit is configured for natural gas. The appropriate manufacturer’s propane gas conversion kit, must be applied for propane gas installations. Refer to the “Propane Gas and/or High Altitude Installations” section for details. • Use two pipe wrenches when making connection to the gas valve to keep it from turning. The orientation of the gas valve on the manifold must be maintained as shipped from the factory. • Install a manual shutoff valve between the gas meter and unit within six feet of the unit.
COUNTERFLOW INSTALLATIONS When the gas piping enters through the left side of the furnace, the installer must supply a straight pipe to reach the exterior of the furnace. A ground joint union, drip leg, and manual shutoff valve must also be supplied by the installer. In some cases, the installer may also need to supply a transition piece from 1/2" to another pipe size.
FILTERS - READ THIS SECTION BEFORE INSTALLING THE RETURN AIR DUCTWORK Sizing Between First and Second Stage Regulator* Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting. Capacities in 1,000 BTU/hour. Pipe or Tubing Length, Feet 10 20 30 40 50 60 80 100 125 150 200 250 Nominal Pipe Size Schedule 40 Tubing Size, O.D.
NORMAL HEATING SEQUENCE 3. Set the room thermostat to the lowest possible setting. 1. Thermostat calls for heat . 4. Remove the burner compartment door. 2. The induced draft blower is energized. NOTE: This furnace is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand. 3. The igniter is energized and is allowed to preheat. 4. The gas valve is energized delivering gas to the burners and starting combustion. 5.
GAS SUPPLY PRESSURE MEASUREMENT 5. Turn OFF gas to furnace at the manual shutoff valve and disconnect manometer. Reinstall plug before turning on gas to furnace. 6. Turn OFF any unnecessary gas appliances started in step 3. CAUTION TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE WHITE-RODGERS 36G22 GAS VALVE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING.
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT 6. Remove regulator screw cover. Turn regulator screw either clockwise to increase pressure or counterclockwise to decrease. Always adjust regulator to provide the correct pressure according to the original equipment manufacturer specifications listed on the appliance rating plate. 7. Replace regulator screw cover and finger-tighten securely. 8. Turn OFF all electrical power to the system. 9. Remove manometer and hose from outlet pressure tap. 10.
TEMPERATURE RISE To adjust the circulator blower speed, proceed as follows: Air temperature rise is the temperature difference between supply and return air. The proper amount of temperature rise is usually obtained when the unit is operated at the rated input with the “as shipped” blower speed. If the correct amount of temperature rise is not obtained, it may be necessary to change the blower speed. 1. Turn OFF power to the furnace. 2.
IMPORTANT NOTE: This unit must not be used as a construction heater during the finishing phases of construction of a new structure. This type of use may result in premature failure due to extremely low return air temperatures and exposure to corrosive or very dirty atmospheres. C he ck the burner flam es for: 1. G ood adju stm ent 2. Stab le, soft and blu e 3. N ot curlin g, flo atin g, o r lifting off.
Use the following precautions during furnace installation and servicing to protect the integrated control module from damage. By putting the furnace, the control, and the person at the same electrostatic potential, these steps will help avoid exposing the integrated control module to electrostatic discharge. This procedure is applicable to both installed and uninstalled (ungrounded) furnaces. 1. Disconnect all power to the furnace.
UPRIGHT FILTER REMOVAL CLEANING (QUALIFIED SERVICER ONLY) To remove filters from an external filter rack in an upright upflow installation, follow the directions provided with external filter rack kit. 1. Shut off electric power and gas supply to the furnace. 2. Remove screws securing manifold to burner bracket. Slightly pull manifold out and away from burner bracket. Burners will drop. Re-secure manifold to burner bracket. Clean, wash and dry a permanent filter.
TROUBLESHOOTING CHART Symptoms of Abnormal Operation Associated • Furnace fails to operate. NONE Fault Description(s) Possible Causes Corrective Action • Integrated control module diagnostic LED provides no signal. • No 115 volt power • Manual disconnect switch to furnace, or no 24 OFF, door switch open, or volt power to 24 volt wires improperly integrated control connected or loose. module. • Blown fuse or circuit • Blown fuse or circuit breaker. breaker.
TROUBLESHOOTING CHART Symptoms of Abnormal Operation • Circulator blower runs continuously. No furnace operation. • Integrated control module diagnostic LED is flashing FOUR (4) flashes. • Induced draft blower and circulator blower runs continuously. No furnace operation. Associated Fault Description(s) Possible Causes Corrective Action Cautions and Notes LED Code2 4 • Primary limit circuit is open. 4 FLASHES 5 • Flame sensed with no call for heat.
Wiring Diagram for GMS8/GDS8/GHS8 WARNING:DISCONNECT POWER BEFORE SERVICING.WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED.
NOTE: SPECIFICATIONS AND PERFORMANCE DATA LISTED HEREIN ARE SUBJECT TO CHANGE WITHOUT NOTICE Quality Makes the Difference! All of our systems are designed and manufactured with the same high quality standards regardless of size or efficiency. We have designed these units to significantly reduce the most frequent causes of product failure. They are simple to service and forgiving to operate. We use quality materials and components. Finally, every unit is run tested before it leaves the factory.