Table of Contents
Advertisement
Quick Links
VersaPro™
80% Gas Furnace
Installation Manual
MODELS:
• MGA80EE040A3B
• MGA80EE060B4B
• MGA80EE080B4B
• MGA80EE080C4B
• MGA80EE100C5B
• MGA80EE120D5B
Read this manual carefully before installation and keep it where
the operator can easily find it for future reference.
Due to updates and constantly improving performance, the
information and instructions within this manual are subject to
change without notice.
Version Date: March 22, 2024
Please visit www.mrcool.com/documentation
to ensure you have the latest version of this manual.
Advertisement
Table of Contents
Related Manuals for MrCool VersaPro MGA80EE040A3B
Summary of Contents for MrCool VersaPro MGA80EE040A3B
- Page 1 Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Version Date: March 22, 2024 Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual.
-
Page 2: Table Of Contents
7.6 Gas Input Rate Measurement (Natural Gas Only) ............... 45 7.7 Temperature Rise Adjustment ....................... 45 7.8 Circulator Blower Speed Adjustment .................... 46 OPERATIONAL CHECKS ........................... 47 8.1 Burner Flame ............................ 47 SAFETY CIRCUITS ............................. 48 9.1 General .............................. 48 9.2 Integrated Control Module ......................48 mrcool.com... - Page 3 Do not use any phone in the building. • Immediately call your gas supplier from a phone outside of the building and follow the gas supplier's instructions. • If you cannot reach your gas supplier, call the fire department. mrcool.com...
-
Page 4: Safety
Consult a qualified service agency, local gas supplier, or MRCOOL for information or assistance. The qualified service agency must use only factory-authorized and listed kits or accessories when modifying this product. - Page 5 The physical support of the furnace is sound without sagging, cracks, gaps, etc. around the base so as to provide a seal between the support and the base. • There are no obvious signs of deterioration of the furnace. • The burner flames are adjusted appropriately. mrcool.com...
- Page 6 1. Set the thermostat to its lowest setting. 2. Turn off all electric power to the appliance if service is to be performed. 3. Remove control access panel. 4. Push gas control to "OFF". Do not force. 5. Replace control access panel. mrcool.com...
-
Page 7: Unit Overview
13 (330) 15-57/32 (326) MGA80EE060B4B 17.5 (446) 16 (406) 15-27/32 (402) MGA80EE080B4B 17.5 (446) 16 (406) 15-27/32 (402) MGA80EE080C4B 21 (533) 19.5 (495) 19-13/32 (493) MGA80EE100C5B 21 (533) 19.5 (495) 19-13/32 (493) MGA80EE120D5B 24.5 (622) 23 (584) 22-27/32 (580) mrcool.com... -
Page 8: Unit Description
USA: National Fuel Gas Code (NFGC) NFPA 54-2006/ ANSI Z223.1-2006 and the Installation Standards, Warm • Air Heating and Air Conditioning Systems ANSI/NFPA 90B CANADA: CSA B149.1-05 National Standard of Canada Natural Gas and Propane Installation Codes (CAN/ • CSA-B149.1-05) Figure 2.3 mrcool.com... - Page 9 US: National Electrical Code (NEC) ANSI/NFPA 70-2008. • CANADA: Canadian Electrical Code CSA C22.I. • Electrical Power Supply Voltage: ANSI C84.1-2006 (104-127 volt) • Venting US: NFGC NFPA 54/ANSI Z223.1-2006 ; chapters 12 and 13. • CANADA: CAN/CSA-B149.1-05 Part 8 and Appendix C. • mrcool.com...
-
Page 10: Electrostatic Discharge Precaution Procedure
The following types of furnace installations may require outdoor air for combustion due to chemical exposures: Commercial buildings • Buildings with indoor pools • Laundry rooms • Hobby or craft rooms • Chemical storage areas • mrcool.com... - Page 11 All fuel-burning equipment must be supplied with air for fuel combustion. Sufficient air must be provided to avoid negative pressure in the equipment room or space. A positive seal must be made between the furnace cabinet and the return-air duct to prevent pulling air from the burner area and from draft safeguard opening. Figure 3.1a mrcool.com...
- Page 12 The furnace, ductwork and filters are cleaned as necessary to remove drywall dust and construction debris from all HVAC system components after construction is completed. • Verify proper furnace operating conditions including ignition, gas input rate, air temperature rise, and venting according to these installation instructions. mrcool.com...
- Page 13 Ø 18 inches (457.2mm) front clearance required for A special base is required. • alcove. mrcool.com...
-
Page 14: Upflow Installation
The furnace is shipped with its bottom closure panel installed in the bottom return-air opening. This panel MUST be in place when only side-return air is used. NOTE Side return-air openings can be used in UPFLOW and most HORIZONTAL configurations. Do not use side return-air openings in DOWNFLOW configuration. mrcool.com... -
Page 15: Downflow Installation
Do not use side return openings in a downflow configuration. The furnace is shipped with its bottom closure panel installed in the bottom return-air opening. Remove and discard this panel when bottom return air is used. See Figure 3.2 for bottom closure removal. Figure 3.3a mrcool.com... - Page 16 Downflow Applications on Combustible Flooring Using Special Base 19 (483) 23 (584) (563) (503) (622) Downflow Applications on Combustible Flooring with Manufacturer 19-11/16 19-3/16 20-5/16 19-13/16 Supplied Coil Assembly or Coil Box (500) (487) (516) (503) Figure 3.3b Figure 3.3c mrcool.com...
- Page 17 INDOOR UNIT INSTALLATION Figure 3.3d Figure 3.3e mrcool.com...
-
Page 18: Horizontal Installation
For crawl space installations, if the furnace is not suspended from the floor joists, the ground underneath the furnace must be level and the furnace set on blocks or bricks. mrcool.com... - Page 19 Elbow Up then Left Elbow Up then Right Figure 3.4c Figure 3.4d Horizontal Left Application-Vent Elbow Up Horizontal Right Application-Vent Elbow Up Figure 3.4e Figure 3.4f Figure 3.4g Upflow Application-Vent Elbow Right Upflow Application-Vent Elbow Up Upflow Application-Vent Elbow Right mrcool.com...
-
Page 20: Filter Arrangement
Air Systems Design Guidelines reference tables available from your local distributor. The duct system should be sized to handle the required system design CFM at the design external static pressure. The furnace airflow rates are provided in Table 3.6a AIR DELIVERY-CFM (Without Filter). mrcool.com... - Page 21 ONLY the accessory subbase or a factory approved air conditioning coil casing. DO NOT cut main furnace casing to attach supply side air duct, humidifier, or other accessories. All accessories MUST be connected to a duct that is external to the furnace casing. mrcool.com...
- Page 22 Temp Rise °F (°C) [SCFM] 1301 1294 1313 1325 1301 1288 Temp Rise °F (°C) [SCFM] 1101 1106 1103 1106 1077 1142 Temp Rise °F (°C) [SCFM] 80B4B Temp Rise °F (°C) [SCFM] Temp Rise °F (°C) [SCFM] Temp Rise °F (°C) mrcool.com...
- Page 23 Filter Size Furnace Casing Width Filter Type Side Return Bottom Return 14-1/2 (368) 16X25 (406X635) 14X25 (356X365) 17-1/2 (445) 16X25 (406X635) 16X25 (406X635) High Velocity (600 FPM) 21 (533) 16X25 (406X635) 20X25 (508X635) 24.5 (622) 16X25 (406X635) 24X25 (610X635) mrcool.com...
-
Page 24: Venting
60° offset is permitted. 4.3 Venting into Existing Chimney This furnace may not be connected to any masonry chimney. However, an existing masonry chimney may be used as a chase through which the metal vent pipe passes. mrcool.com... -
Page 25: Air For Combustion & Ventilation
A confined space is an area with less than 50 cu.ft (1.42m3) per 1,000 Btu/hr (0.2928 kW) input rating for all of the appliances installed in that area. The following must be considered to obtain proper air for combustion and ventilation in confined spaces. mrcool.com... - Page 26 EXAMPLE: Determining Free Area Appliance 1 Appliance 2 Total Input 100,000 + 30,000 = (130,000 / 4,000) = 32.5 in Vertical Appliance 1 Appliance 2 Total Input Figure 4.4b 100,000 + 30,000 = (130,000 / 2,000) = 65 in Horizontal mrcool.com...
- Page 27 It is recommended that you follow the venting safety procedure. This procedure is designed to detect an inadequate ventilation system that can cause the appliances in the area to operate improperly causing unsafe levels of carbon monoxide or create unsafe conditions. mrcool.com...
- Page 28 National Fuel Gas Code Z223.1 or CAN/CGA B149.1 Natural Gas and Propane Installation Code (latest editions). If the vent system must be resized, follow the appropriate tables in Appendix G of the above codes or for this appliance. mrcool.com...
-
Page 29: Gas Supply & Piping
The furnace derate is 4% for each 1,000 feet above sea level. This table is based upon a heating value of approximately 1,000 Btu/ft3. In Canada, the input rating must be derated by 10% for altitudes of 2,000 ft. (610m) to 4,500 feet (1370m) above sea level by an authorized Gas Conversion Station or Dealer. mrcool.com... -
Page 30: Propane Gas Conversion
Contact your distributor for a tabular listing of appropriate manufacturer's kits for propane gas and/or high altitude installations. The indicated kits must be used to insure safe and proper furnace operation. All conversions must be performed by a qualified installer, or service agency. mrcool.com... -
Page 31: Gas Piping Connections
The gas piping supplying the furnace must be properly sized based on the gas flow required, specific gravity of the gas, and length of the run. The gas line installation must comply with local codes, or in their absence, refer to the latest version of NFPA54/ANSI Z223.1 for US and the latest version of CSA B149.1 for Canada. mrcool.com... - Page 32 When the gas piping enters through the right side of the furnace, the installer must supply the following fittings (starting from the gas valve): 90° elbows (2) • Close nipple • Straight pipe to reach the exterior of the furnace • mrcool.com...
-
Page 33: Gas Piping Checks
1/2 psig (3.48 kPa). This unit must be isolated from the gas supply system by closing its manual shutoff valve before pressure testing of gas supply piping system with test pressures equal to or less than 1/2 psig (3.48 kPa). mrcool.com... -
Page 34: Electrical Connections
If factory location of J-Box is acceptable, go to next section. On 14" wide casing models, the J-Box shall not be relocated to other side of furnace casing when the vent pipe is routed within the casing. 1. Remove and save two screws holding J-Box. mrcool.com... -
Page 35: Electrical Connection To J-Box
4. Route and secure field ground wire to green ground screw on J-Box bracket, or the furnace will fail to operate. 5. Connect line voltage leads as shown in Fig. 9-3. 6. Reinstall cover to J-Box. Do not pinch wires between cover and bracket. mrcool.com... -
Page 36: Power Cord Installation To J-Box
3. Secure power cord to J-Box bracket with a strain relief bushing or a connector approved for the type of cord used. 4. Secure field ground wire to green ground screw on J-Box bracket. 5. Connect line voltage leads as shown in Figure 6.7c. 6. Reinstall cover to J-Box. Do not pinch wires between cover and bracket. mrcool.com... -
Page 37: Bx Cable Installation In Furnace J-Box
2. Humidifier (HUM) Connect an accessory 115V AC, 0.5 amp. maximum humidifier (if used) to the 1/4-in male quick-connect HUM-H terminal and NEUTRALS terminal on the control board. The HUM terminal is energized when gas valve relay is energized. mrcool.com... -
Page 38: Grounding
The furnace must be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70, and /or the Canadian Electrical Code, CSA C22.1, Part 1, if an external electrical source is utilized. 6.8 Furnace Control Diagram Figure 6.7a mrcool.com... - Page 39 ELECTRICAL CONNECTIONS Figure 6.7b mrcool.com...
-
Page 40: Wiring Diagram With I-Stage Thermostat
4. Y1 connect single stage cooling system thermostat Y terminal. 5. Please connect W/W1 with single stage heat system thermostat terminal W and W2 reserved. 6. If any of the original wire, as supplied, must be replaced, use the same type or equivalent wire. mrcool.com... -
Page 41: Start-Up Adjustment & Safety Check
This light can be viewed through the observation window in the blower access door. Refer to the Troubleshooting Chart for further explanation of the lighting codes. Follow the start-up and adjustment items, refer to further information in Operational Checks. mrcool.com... -
Page 42: Furnace Start-Up
7.4 Sequence of Operation NOTE Furnace control must be grounded for proper operation or control will lock out. Control is grounded through green wire routed to gas valve and manifold bracket screw. Follow the sequence of operation through the different modes. mrcool.com... - Page 43 Humidifier is de-energized. The blower motor BLWM and air cleaner terminal EAC will remain energized for 90, 120, 150, or 180 seconds (depending on the HEAT-OFF delay selection). The furnace control CPU is factory-set for a 90-second HEAT-OFF delay. mrcool.com...
- Page 44 If the thermostat fan switch is moved to the ON position, the circulator fan (low heat speed) and the electronic air cleaner (optional) are energized. When the fan switch is returned to the AUTO position, the circulator and electronic air cleaner are de-energized. mrcool.com...
-
Page 45: Gas Manifold Pressure Measurement & Adjustment
11. Turn ON system power and set thermostat to call for heat. 12. Using a leak detection solution or non-chlorine soap suds, check for leaks at hose connection. Bubbles forming indicate a leak. SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY! Figure 7.5 mrcool.com... -
Page 46: Gas Input Rate Measurement (Natural Gas Only)
An incorrect temperature rise can cause condensing in or overheating of the heat exchanger. Determine and adjust the temperature rise as follows. The temperature rise must be within the range specified on the rating plate. mrcool.com... -
Page 47: Temperature Rise Adjustment
CFM. To adjust the circulator blower speed, proceed as follows: 1. Turn off power to the furnace. 2. Select the heating and cooling blower speeds that match the installation requirements from the Air Delivery-CFM (Without Filter) table. mrcool.com... -
Page 48: Operational Checks
(dust may cause orange tips but they must not be yellow). Flames should extend directly outward from the burners without curling, floating, or lifting off, and should enter heat-exchanger tube. Flames must not impinge on the sides of the heat exchanger firing tubes. Figure 8.1 mrcool.com... -
Page 49: General
WARNING-FIRE, EXPLOSION, OR CARBON MONOXIDE POISONING HAZARD Failure to replace with proper control could result in fire, explosion or carbon monoxide poisoning. This appliance uses a NEGATIVE PRESSURE REGULATED gas control. Replace ONLY with the same model number or as specified by the manufacturer. mrcool.com... -
Page 50: Troubleshooting
WARNING-FIRE, EXPLOSION, AND ASPHYXIATION HAZARD Failure to replace with proper control could result in fire, explosion or carbon monoxide poisoning. This appliance uses a NEGATIVE PRESSURE REGULATED gas control. Replace ONLY with the same model number or as specified by the manufacturer. mrcool.com... - Page 51 Ensure the wire control signal refer to user manual. 1. Integrated control module will automatically attempt to reset from lockout after one hour. 2. LED Flash code will cease if power to the control module is interrupted through the disconnect or door switch. mrcool.com...
-
Page 52: Service & Maintenance Procedures
Depending on the installation, differing filter arrangements can be applied. A media air filter or electronic air cleaner can be used as an alternate filter. Follow the filter sizes given in the Recommended Minimum Filter size table to ensure proper unit performance. For further details, see your distributor. mrcool.com... -
Page 53: Induced Draft & Circulating Blower Motors
NOTE If the condition which originally caused the lockout still exists, the control will return to lockout. Refer to the diagnostic chart for help in determining the cause. mrcool.com... -
Page 54: Cleaning Heat Exchanger
Remove metal screw fitting from wire brush to allow insertion into cable. b. Insert the twisted wire end of brush into end of spring cable, and crimp tight with crimping tool or crimp by striking with ball-peen hammer. TIGHTNESS IS VERY IMPORTANT. mrcool.com... - Page 55 RTV sealant (G.E. 162, 6702, or Dow-Corning 738) are needed before starting installation. DO NOT substitute any other type of RTV sealant. G.E. 162 (P771- 9003) is available through RCD in 3-oz. tubes. mrcool.com...
-
Page 56: Before Leaving An Installation
When ordering any of the listed functional parts, be sure to provide the furnace model, manufacturing, and • serial numbers with the order. Although only functional parts are shown in the parts list, all sheet metal parts, doors, etc. may be ordered by • description. Parts are available from your distributor. • mrcool.com... - Page 57 Mini Igniter Transformer Pressure Switch Natural/Propane Gas Orifice Rollout Limit Switch Pressure Switch Hose Burner Primary Limit Switch Flame Sensor Door Switch Junction Box IPM Module Integrated Control Module Induced Draft Blower 24 Volt Thermostat Connections Flue Collector Box mrcool.com...
- Page 58 VersaPro™ 80% Gas Furnace Installation Manual The design and specifications of this product and/or manual are subject to change without prior notice. Consult with the sales agency or manufacturer for details.
Need help?
Do you have a question about the VersaPro MGA80EE040A3B and is the answer not in the manual?
Questions and answers