MRCOOL MGM96 96 Gas Furnace Instruction Manual
- August 18, 2024
- MrCOOL
Table of Contents
MRCOOL MGM96 96 Gas Furnace
Specifications
- Product Name : VersaProTM 96% Gas Furnace
- Version Date : 05/30/24
- Gas Type : Natural Gas and Propane (LP) Gas
- Efficiency : 96%
Product Usage Instructions
Safety Precautions
Before using the VersaProTM 96% Gas Furnace, it is crucial to read and
understand the safety precautions outlined in the manual. Failure to follow
these precautions may result in serious damage or injury.
Installation
- Ensure that installation is carried out by a qualified installer, service agency, or gas supplier.
- The furnace is approved for use with Natural Gas and Propane (LP) Gas only. Do not attempt to use any other type of fuel.
Operation
- Familiarize yourself with the error codes provided in the manual for troubleshooting purposes.
- Avoid storing or using flammable vapors or liquids near the furnace to prevent fire hazards.
Maintenance
- Regularly check and clean the furnace to ensure optimal performance.
- Refer to the manual for specific maintenance requirements and schedules.
SAFETY
Safety Precautions
Read Before Using
Incorrect usage may cause serious damage or injury. The symbols below are used
throughout this manual to indicate instructions that should be followed
closely or actions that should be avoided to prevent death, injury, and/or
property damage.
WARNING : Indicates the possibility of personal injury or loss of life.
CAUTION : Indicates the possibility of property damage or serious
consequences.
NOTICE : Used to address practices not related to personal injury.
WARNING : FIRE OR EXPLOSION HAZARD
- Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
- If you smell gas:
- Do not try to light any appliance.
- Do not touch any electrical switch; do not use any phone in the building.
- Leave the building immediately.
- Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
- If you cannot reach your gas supplier, call the fire department.\
- Installation and service must be performed by a qualified installer, service agency, or the gas supplier.
- The furnace is designed and approved for use with Natural Gas and Propane (LP) Gas ONLY.
- DO NOT BURN ANY LIQUID FUEL OR SOLID FUEL IN THIS FURNACE.
- Burning any unapproved fuel will result in damage to the furnace’s heat exchanger, which could result in Fire, Personal Injury, and/or Property Damage.
- Improper installation, adjustment, alteration, maintenance, or use could cause carbon monoxide poisoning, explosion, fire, electrical shock, or other conditions which may cause personal injury or damage. Consult a qualified service agency, local gas supplier, or your distributor for information or assistance.
- The furnace must be kept free and clear of insulating materials. Inspect surrounding area to ensure insulation material is at a safe distance when installing furnaces or adding insulation materials. Insulation materials ma be combustible. Maintain a 1 inch clearance from combustible materials to supply air ductwork for a distance of 36 inches horizontally from the furnace. See NFPA 90B or local code for further requirements.
- The furnace SHOULD NOT be installed directly on carpeting, tile, or any other combustible material other than wood flooring. In downflow installations, a field supplied floor base MUST be used when installed on combustible materials and wood flooring. A special base is not required when this furnace is installed on industry-standard coil assembly matching correct furnace width.
- Check entire gas assembly for leaks after lighting this appliance.
- Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections, as specified in the installation and owner’s manual.
- See instructions for lighting/shutdown operation (as shown on a sticker directly on the inside of the furnace panel). Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the furnace before shutting off the electrical supply.
TROUBLESHOOTING
WARNING
- Untrained personnel (homeowners) may only clean and replace filters and fuses as required for basic maintenance. All other operations, including installation, repair, and service must be performed by a qualified installer, service agency, or the gas supplier.
- Do not use this furnace if any part has been under water. A flood-damaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion. A qualified service agent must inspect the furnace and replace all gas controls, control system parts, and electrical parts that have been wet, or the furnace if deemed necessary.
- Wear safety glasses, protective clothing, and work gloves. Have a fire extinguisher available.
- Read these instructions thoroughly and follow all warnings or cautions included in literature attached to the unit.
- Consult local building codes as well as the current editions of the National Fuel Gas Code (NFGC) NFPA 54/ANSI Z223.1 and the National Electrical Code (NEC) NFPA 70.
- This product can expose you to chemicals including lead and lead components, which are known to the State of California to cause cancer and birth defects or other reproductive harm. Fore more information, go to www.P65Warnings.ca.gov.
CAUTION: CUT HAZARD
Failure to follow this caution may result in personal injury. Sheet metal
parts may have sharp edges or burrs. Use care and wear appropriate protective
clothing, safety glasses, and gloves when handling parts and servicing the
furnace.
Electrostatic Discharge (ESD) Precautions
NOTE: Discharge body’s static electricity before touching unit. An
electrostatic discharge can adversely affect electrical components.
Use the following precautions during furnace installation and servicing to protect the integrated control module from damage. By putting the furnace 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.
- Disconnect all power to the furnace. Do not touch the integrated control module or any wire connected to the control prior to discharging your body’s electrostatic charge to ground.
- Firmly touch a clean unpainted metal surface of the furnace away from the control. Any tools held in a person’s hand during grounding will be discharged.
- Service integrated control module or connecting wiring following the discharge process in step 2. Use caution not to recharge your body with static electricity; (i.e. do not move or shuffle e your feet, do not touch ungrounded objects, etc.). If you come in contact with an ungrounded object, repeat step 2 before touching control or wires.
- 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.
ERROR CODES
Resetting from Lockout
Furnace lockout results when a furnace is unable to achieve ignition after
three attempts. Refer to the troubleshooting chart on the following pages for
assistance in determining the source of unit operational problems. The red
diagnostic LED blinks to assist in troubleshooting the unit. If the furnace is
in “lockout” it will (or can be) reset in any of the following ways.
- Automatic reset. The integrated control module will automatically reset itself and attempt to resume normal operations following a one hour lockout period.
- Manual power interruption. Interrupt 115 volt power to the furnace for 1 – 20 seconds.
- Manual thermostat cycle. Lower the thermostat so that there is no longer a call for heat for 1 – 20 sec.
E7 System Lock-Out Failed Ignition, E8 System Lock-out Too Many Flame Dropouts
Table 1 Manifold Gas Pressure
| Manifold Gas Pressure | |
|---|---|
| Natural Gas | 3.5 in. W.C. |
| Propane Gas | 10 in. W.C. |
Table 2 Inlet Gas Supply Pressure
| Inlet Gas Supply Pressure | |
|---|---|
| Natural Gas | Minimum: 4.5 in. W.C. |
| Propane Gas | Minimum: 11.0 in W.C. |
E1 Low Fire Pressure Switch Stuck Closed
E2 Low-Pressure Switch Stuck Open, E4 Pressure Switch Cycle Lockout, E3 High-Pressure Switch Stuck Open
E5 Limit/Rollout Switch Open Less than 5 Minutes, E6 Limit/Rollout Switch Open More than 5 Minutes
Model| MGM96EE060B3NB| MGM96EE080B3NB| MGM96EE080C4NB|
MGM96EE100C5NB| MGM96EE120D5NB
---|---|---|---|---|---
Rollout Switch – Resettable| —| °F| 300
Inlet High Temp. Limit Switch – Fixed| Off/
On
| °F| 150 / 120| 150 / 120| 150 / 120| 150 / 120| 150 / 120
__
Furnace Size
| __
Return-Air Inlet
| __
Speed
| | External Static Pressure (in. W.C.)
---|---|---|---|---
0.1| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7|
0.8| 0.9| 1.0
__
__
__
__
__
__
__
__
60B
| __
__
__
__
__
__
__
__
Bottom or Sides
| __
H
| CFM| 1339| 1327| 1338| 1309| 1321| 1320| 1342| 1334| 1316| 1335
Temp. Rise-1st Stage °F| —| —| —| —| —| —| —| —| —| —
Temp. Ride-2nd Stage °F| 37.3| 37.7| 37.5| 38.3| 38.1| 38.1| 37.6| 37.9| 38.5|
38.0
__
Mid-H
| CFM| 1124| 1118| 1102| 1106| 1096| 1099| 1102| 1109| 1089| 1105
Temp. Rise-1st Stage °F| —| —| —| —| —| —| —| —| —| —
Temp. Ride-2nd Stage °F| 44.2| 44.5| 45.2| 45.1| 45.6| 45.5| 45.5| 45.3| 46.2|
45.6
__
Mid
| CFM| 880| 870| 853| 858| 865| 858| 854| 866| 871| 839
Temp. Rise-1st Stage °F| 36.7| 37.2| 37.9| 37.8| 37.6| 38.0| 38.2| 37.8| 37.6|
39.1
Temp. Ride-2nd Stage °F| 56.3| 57.0| 58.1| 57.9| 57.5| 58.0| 58.4| 57.7| 57.4|
59.7
__
Mid-L
| CFM| 779| 768| 762| 756| 740| 753| 757| 747| 785| 766
Temp. Rise-1st Stage °F| 41.4| 42.0| 42.4| 42.8| 43.8| 43.1| 43.0| 43.6| 41.6|
42.7
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
__
Low
| CFM| 553| 586| 543| 569| 552| 562| 584| 572| 575| 567
Temp. Rise-1st Stage °F| 58.1| 54.9| 59.3| 56.74| 58.5| 57.6| 55.5| 56.8|
56.5| 57.4
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
__
__
__
__
__
__
__
__
80B
| __
__
__
__
__
__
__
__
Bottom or Sides
| __
H
| CFM| 1230| 1233| 1222| 1226| 1214| 1236| 1255| 1244| 1249| 1251
Temp. Rise-1st Stage °F| —| —| —| —| —| —| —| —| —| —
Temp. Ride-2nd Stage °F| 53.9| 53.8| 54.4| 54.3| 54.8| 53.9| 53.2| 53.7| 53.6|
53.6
__
Mid-H
| CFM| 1052| 1052| 1041| 1044| 1037| 1034| 1048| 1046| 1024| 1076
Temp. Rise-1st Stage °F| 41.0| 41.0| 41.5| 41.5| 41.8| 42.1| 41.5| 41.7| 42.7|
40.7
Temp. Ride-2nd Stage °F| 62.8| 62.8| 63.6| 63.5| 64.0| 64.3| 63.4| 63.7| 65.1|
62.1
__
Mid
| CFM| 849| 861| 854| 853| 855| 844| 855| 848| 834| 859
Temp. Rise-1st Stage °F| 50.6| 50.0| 50.4| 50.5| 50.5| 51.2| 50.6| 51.2| 52.1|
50.7
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
__
Mid-L
| CFM| 754| 771| 765| 764| 728| 761| 782| 739| 758| 758
Temp. Rise-1st Stage °F| 56.9| 55.7| 56.2| 56.3| 59.2| 56.8| 55.3| 58.5| 57.2|
57.3
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
__
Low
| CFM| 569| 554| 571| 572| 568| 572| 598| 594| 572| 548
Temp. Rise-1st Stage °F| —| —| —| —| —| —| —| —| —| —
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
__
__
__
__
__
__
__
__
80C
| __
__
__
__
__
__
__
__
Bottom or Sides
| __
H
| CFM| 1303| 1301| 1281| 1291| 1289| 1291| 1290| 1295| 1298| 1253
Temp. Rise-1st Stage °F| —| —| —| —| —| —| —| —| —| —
Temp. Ride-2nd Stage °F| 50.8| 50.9| 51.8| 51.5| 51.6| 51.6| 51.7| 51.6| 51.6|
53.5
__
Mid-H
| CFM| 1120| 1127| 1134| 1130| 1135| 1138| 1132| 1143| 1107| 1112
Temp. Rise-1st Stage °F| 38.5| 38.3| 38.1| 38.3| 38.2| 38.2| 38.5| 38.2| 39.5|
39.4
Temp. Ride-2nd Stage °F| 59.0| 58.7| 58.4| 58.7| 58.5| 58.4| 58.8| 58.3| 60.3|
60.1
__
Mid
| CFM| 908| 894| 896| 902| 896| 894| 864| 891| 935| 880
Temp. Rise-1st Stage °F| 47.3| 48.1| 48.0| 47.8| 48.2| 48.4| 50.1| 48.7| 46.5|
49.5
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
__
Mid-L
| CFM| 818| 819| 825| 800| 813| 803| 831| 838| 791| 802
Temp. Rise-1st Stage °F| 52.4| 52.4| 52.1| 53.8| 53.1| 53.8| 52.1| 51.8| 54.9|
54.2
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
__
Low
| CFM| 577| 628| 605| 624| 615| 601| 628| 573| 590| 588
Temp. Rise-1st Stage °F| —| —| —| —| —| —| —| —| —| —
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
Table 4 – Air Delivery CFM (Without Filter)
A filter is required for each return air inlet. This table shows the airflow
performance without a filter. To determine airflow performance with a filter,
if a 3/4 inch (19mm) washable media filter is used, assume an additional 0.1
in. W.C. available external static pressure.
The manufacturer default fan settings are based on model, refer to Table 24.
Furnace Size
|
Return-Air Inlet
|
Speed
| | External Static Pressure (in. W.C.)
---|---|---|---|---
0.1| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7|
0.8| 0.9| 1.0
100C
|
Bottom or Sides
|
H
| CFM| 1752| 1764| 1768| 1781| 1774| 1786| 1762| 1802| 1792| 1786
Temp. Rise-1st Stage °F| —| —| —| —| —| —| —| —| —| —
Temp. Ride-2nd Stage °F| 47.5| 47.3| 47.3| 47.0| 47.3| 47.0| 47.7| 46.8| 47.2|
47.4
Mid-H
| CFM| 1512| 1506| 1536| 1523| 1514| 1509| 1529| 1551| 1565| 1532
Temp. Rise-1st Stage °F| 38.6| 38.8| 38.1| 38.5| 38.8| 39.0| 38.6| 38.1| 37.9|
38.8
Temp. Ride-2nd Stage °F| 54.8| 55.1| 54.1| 54.6| 55.1| 55.3| 54.7| 54.0| 53.6|
54.8
Mid
| CFM| 1354| 1354| 1362| 1370| 1357| 1381| 1389| 1394| 1416| 1383
Temp. Rise-1st Stage °F| 42.9| 43.0| 42.8| 42.6| 43.1| 42.4| 42.3| 42.2| 41.7|
42.7
Temp. Ride-2nd Stage °F| 61.1| 61.1| 60.8| 60.6| 61.2| 60.3| 60.0| 59.9| 59.0|
60.5
Mid-L
| CFM| 1165| 1165| 1176| 1164| 1185| 1190| 1186| 1205| 1174| 1199
Temp. Rise-1st Stage °F| 49.7| 49.7| 49.3| 49.9| 49.2| 49.0| 49.2| 48.6| 49.9|
49.0
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
Low
| CFM| 994| 1025| 1018| 1024| 1032| 1026| 1035| 988| 1005| 1041
Temp. Rise-1st Stage °F| 58.1| 56.4| 56.9| 56.6| 56.3| 56.7| 56.3| 59.0| 58.1|
56.2
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
120D
|
Bottom or Sides
|
H
| CFM| 1926| 1933| 1915| 1923| 1916| 1929| 1971| 1941| 2036| 1998
Temp. Rise-1st Stage °F| —| —| —| —| —| —| —| —| —| —
Temp. Ride-2nd Stage °F| 51.8| 51.7| 52.2| 52.1| 52.4| 52.1| 51.1| 52.0| 49.8|
50.7
Mid-H
| CFM| 1721| 1747| 1716| 1749| 1760| 1768| 1778| 1783| 1747| 1788
Temp. Rise-1st Stage °F| —| —| —| —| —| —| —| —| —| —
Temp. Ride-2nd Stage °F| 57.8| 57.0| 58.1| 57.1| 56.8| 56.6| 56.4| 56.3| 57.5|
56.4
Mid
| CFM| 1489| 1497| 1503| 1504| 1507| 1488| 1496| 1518| 1519| 1568
Temp. Rise-1st Stage °F| 46.7| 46.6| 46.4| 465| 46.5| 47.1| 47.0| 46.4| 46.4|
45.1
Temp. Ride-2nd Stage °F| 66.5| 66.3| 66.1| 66.1| 66.1| 67.0| 66.7| 65.8| 65.9|
64.0
Mid-L
| CFM| 1384| 1360| 1365| 1384| 1382| 1383| 1379| 1401| 1421| 1414
Temp. Rise-1st Stage °F| 50.2| 51.1| 51.0| 50.4| 50.6| 50.6| 50.8| 50.1| 49.5|
49.9
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
Low
| CFM| 1165| 1175| 1162| 1158| 1158| 1184| 1186| 1204| 1201| 1185
Temp. Rise-1st Stage °F| 59.5| 59.0| 59.8| 60.0| 60.1| 58.9| 58.9| 58.1| 58.4|
59.2
Temp. Ride-2nd Stage °F| —| —| —| —| —| —| —| —| —| —
Table 5 – Air Delivery CFM (Without Filter)
A filter is required for each return air inlet. This table shows the airflow
performance without a filter. To determine airflow performance with a filter,
if a 3/4 inch (19mm) washable media filter is used, assume an additional 0.1
in. W.C. available external static pressure.
The manufacturer default fan settings are based on model, refer to Table 24.
Pr (Incorrect Polarity of L1/L2)
NOTE: Please refer to the wiring diagram to confirm whether the connection is normal. Please check whether the input power ground wire is correctly and reliably connected to the machine.
FL (Low Flame)
APPENDIX
Two-Stage Controller Logic
- Low Fire Heating Mode : Only W1 signal
- High Fire Heating Mode : Both W1 and W2 signal
If you are using a single-stage thermostat, only a W1 signal will be sent. in
this scenario, the furnace will upstage from low to high fire via a timing
sequence. The time delay is set via the S1-1 and S1-2 dip switches on the
control board.
If the furnace fails to ignite, there is a separate logic for the re-ignition
sequence.
Low Fire Heating Mode Logic (only W1 signal):
- When there is a call for heat (W1), the inducer will start on high speed and the low pressure switch closes. This will last for 15 seconds.
- Inducer will turn to low speed and the igniter will energize. This preheating sequences lasts for 17 seconds.
- After preheating, the gas valve opens and the burners light. The igniter will turn off after 3 seconds.
- There is a 30 second time delay before the blower motor starts.
- The system is working properly.
- When there is no call for heat (no W1 call) and no flame is sensed, post-purge begins. This will last for 15 seconds.
- There is a fan delay to dissipate heat in the system. This time depends on the dip switch S1-3 and S1-4. The default time is 180 seconds.
High Fire Heating Mode (W1+W2 Signal):
- When there is a call for heat (W1), the inducer will start on high speed and the low pressure switch closes. This will last for 15 seconds.
- Inducer will turn to low speed and the igniter will energize. This preheating sequences lasts for 17 seconds.
- After preheating, the gas valve opens and the burners light. The igniter will turn off after 3 seconds.
- Before the gas valve, inducer, and pressure switch turn to high stage, there is a 5 second delay.
- There is a time delay of 30 seconds before the blower motor starts.
- The system is working properly in high stage.
- When there is no call for heat, there is a time delay before the inducer shuts down. This will last for 15 seconds.
- The blower motor will run at high speed for 30 seconds for fan delay.
- There is a fan delay to dissipate heat in the system. This time depends on the dip switch S1-3 and S1-4. The default time is 180 seconds.
Ignition Failure & Re-ignition Sequence
If the furnace fails to ignite, there is a separate logic for the re-
ignition sequence:
- When there is a call for heat (W1), the inducer will start on high speed and the low pressure switch closes. This will last for 15 seconds.
- Inducer will turn to low speed and the igniter will energize. This preheating sequence lasts for 17 seconds.
- After preheating, the gas valve opens and the burners light. The igniter will turn off after 3 seconds.
- The gas valve will open for 4 seconds if there is no flame.
- The inducer will run at high speed for 60 seconds.
- Test of low pressure switch
- Preheating occurs for 27 seconds.
- After preheating, the gas valve opens. The igniter will turn off after 3 seconds. After two failed ignition attempts, the system will lock out.
Requirements for Refrigerant Leakage Sensors
W2 Delay
DIP SW| Nominal
(Minutes)
S1- 1| S1- 2
*OFF| OFF| OFF
ON| OFF| 10
OFF| ON| AUTO
ON| ON| 20
Heat Off Delay
DIP SW| Nominal
(Minutes)
S2- 1| S2- 2
*OFF| OFF| 90
ON| OFF| 120
OFF| ON| 150
ON| ON| 180
Cool Off Delay
DIP SW| Nominal
(Minutes)
S2- 3| S2- 4
*OFF| OFF| 60
ON| OFF| 90
OFF| ON| 120
ON| ON| 150
Option Switch Positions
Series of Products
SW2- 4| OFF| 80% Gas Furnace
ON| 96% Gas Furnace
A
96% Machine Type
DIP SW| Type
SW2- 1| SW2- 2| SW2- 3
OFF| OFF| OFF|
OFF| OFF| ON|
OFF| ON| OFF| 60B, 80B
OFF| ON| ON| 80C
ON| OFF| OFF| 100C
ON| OFF| ON| 120D
B
Fan Speed
SW1- 1| OFF| Normal Speed
ON| Slow Speed
SW1- 2| OFF| W/O Refrigerant Sensor
ON| W/ Refrigerant Sensor
WARNING
According to the safety requirements of UL 60335-2-40 on combustible
refrigerant A2L, when the gas furnace is used with coil and the new type of
combustible refrigerant is used in the coil, the unit must be equipped with
the refrigerant gas detection sensor to monitor the refrigerant concentration
around the unit in real time to prevent the danger of abnormal refrigerant
leakage.
Refrigerant gas detection sensors are manufactured under the coil
manufacturing label and must be installed by a qualified local gas supplier,
distributor or service organization. If the refrigerant gas detection sensor
is not installed or is incorrectly installed, it does not meet the
requirements of current regulations and cannot effectively warn of an
emergency, which may cause personal injury. Therefore, follow the instructions
provided in the manual.
Installation of refrigerant gas detection sensor:
For the use of a coil unit, connect the refrigerant gas sensor cable terminal
to the CN30 Interface, as shown in “Gas Furnace Control Module” and move the
drive plate SW1-2 to the “ON” position. Refer to the coil manual for
installation locations of refrigerant gas sensors.
Operation Indication of Refrigerant Gas Sensor:
When the sensor detects a refrigerant leak, the unit will respond according to
the following rules.
LED2 Number of Green Flashes| Fault Location| Fault Cause|
Unit Response & Handling Method
---|---|---|---
1
| The refrigerant sensor communication fails| The communication with the refrigerant sensor fails for
2 minutes or the refrigerant sensor is faulty.
| The LED2 indicator of the driver board blinks green once, and the Y signal is disconnected to stop cooling.
Contact MRCOOL to check the sensor.
2
|
Refrigerant concentration exceeds the limit alarm value
|
The pipe is damaged or the
refrigerant leaks.
| The green light of the drive board LED2 flashes twice, disconnect the Y signal, stop the refrigeration, and the fan in the unit will continue to run until the refrigerant concentration is detected to decrease to a safe value.
Maintain ventilation and avoid open
flames.
Contact MRCOOL to check the unit.
3
|
Forget the dip reminder
| The sensor is connected and communication is normal, but SW1-2 is in the “OFF” position.| LED2 of the driver board blinks green
three times.
Check whether SW1-2 is in the ON
position.
4
|
Expiration reminder
|
The sensor expired or is faulty.
| The LED2 indicator of the driver board blinks green four times to turn off the Y signal and stop cooling.
Contact MRCOOL for a new refrigerant detection sensor.
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.
FAQ’s
Q: What should I do if I encounter an error code on the furnace?
A: Refer to the troubleshooting section of the manual to identify the error
and follow the recommended steps for resolution.
Q: Can I use fuels other than Natural Gas or Propane in this furnace?
A: No, using any unapproved fuel can lead to damage to the heat exchanger
and should be avoided at all costs.