The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician.
Please read this manual carefully before installation and keep it for future reference.
The Signature Series is NOT designed for amateur installation. Installation SHOULD be performed by an authorized technician.
Please read this manual carefully before installation and keep it for future reference.
Owner & Installation
Manual
MGD80*SE*XA Warm Air Gas Furnace
Signature Series
507332-02C Page 1 of 35mrcool.com
INSTALLATION INSTRUCTIONS
MGD80*SE*XA
Warm Air Gas Furnace
Save these instructions for future reference
(P) 507332-02C
*P507332-02C*
Manufactured By
MRCOOL, LLC
Hickory, KY 42051
This manual must be left with the homeowner for future reference.
WARNING
CAUTION
Table of Contents
Unit Dimensions 2
Parts Arrangement 3
MGD80*E Gas Furnace 4
4
Safety Information 4
6
6
8
11
Duct System 11
19
21
25
29
30
33
34
507332-02CPage 2 of 35 mrcool.com
Top View
Front View
RETURN AIR
OPENING
B
COMBUSTION
AIR INTAKE
EXHAUST AIR
OUTLET
2-1/6 (52)
2-1/4 (57)
5
(127)
9/16
(14)
9/16
(14)
ELECTRICAL INLET
(Either Side)
CONDENSATE
TRAP CONNECTION
(Either Side)
6-1/2 (165)
Either Side
1 (25)
Front Panel
9-1/8 (232) Right
6-9/16 (157) Left
19-17/16 (494)
27-3/4 (705)
2 (51)
Either Side
GAS PIPING INLET
(Either Side)
9/16
(14)
Supply Air
19-1/4 (489)
3/4
(19)
B
33
(838)
A
C
Supply Air
3/4
(19)
3/4
(19)
9/16
(14)
Side View
Unit Dimensions
Capacity
A B C D
in. mm in. mm in. mm in. mm
045-3
070-3
14-1/2 368 13-3/8 340 13 330 4-3/4 121
090-4 17-1/2 446 16-3/8 416 16 406 6-1/4 159
110-5 21 533 19-7/8 504 19-1/2 495 8 203
507332-02C Page 3 of 35mrcool.com
Figure 1.
BLOWER
ASSEMBLY
CABINET
CONTROL
BOX
INTERNAL
FLUE PIPE
ASSEMBLY
FLUE
CHASE
HEAT
EXCHANGER
GAS
VALVE
ACCESS
PANEL
BURNER BOX
ASSEMBLY
COMBUSTION AIR
INDUCER
ROLLOUT
LOCATED INSIDE
BURNER BOX
Parts Arrangement
507332-02CPage 4 of 35 mrcool.com
MGD80*SE*XA Gas Furnace
MGD80*SE*XA
NOTE: In Direct Vent installations, combustion air is taken
Non-Direct Vent installations, combustion air is taken from
Shipping and Packing List
2 - Screws
3 - Wire nuts
1 - Wire tie
Safety Information
DANGER OF EXPLOSION!
WARNING
Clearances
NOTE:
Installed Locations
507332-02C Page 5 of 35mrcool.com
Temperature Rise
NOTE:
Installed in Combination with a Cooling Coil
Figure 2. Heating Unit Installed Parallel to Air Handler
Unit
Quincy, MA 02269
NOTE:
Use of Furnace as a Construction Heater
DO NOT USE THE UNIT FOR CONSTRUCTION HEAT
UNLESS ALL OF THE FOLLOWING CRITERIA ARE
MET:
EQUIPMENT MAY EXPERIENCE PREMATURE
COMPONENT FAILURE AS A RESULT OF FAILURE TO
507332-02CPage 6 of 35 mrcool.com
General
•
•
•
•
NOTE:
•
•
•
Combustion, Dilution & Ventilation Air
•
•
•
•
•
•
•
•
•
•
•
•
WARNING
DISCLAIMS ALL LIABILITY IN CONNECTION WITH
NOTWITHSTANDING THE FOREGOING, INSTALLER
IS RESPONSIBLE FOR CONFIRMING THAT THE USE
OF CONSTRUCTION HEAT IS CONSISTENT WITH
THE POLICIES AND CODES OF ALL REGULATING
507332-02C Page 7 of 35mrcool.com
3
Figure 3.
Inside
NOTE:
Air from Inside
2
Air from Outside
507332-02CPage 8 of 35 mrcool.com
Figure 4.
Outside
(Inlet Air from Crawlspace & Outlet Air to Ventilated
Attic)
NOTE:
Figure 5.
Outside
(All Air through Ventilated Attic)
NOTE:
Figure 6.
Outside
NOTE:
Setting Equipment
WARNING
NOTE:
507332-02C Page 9 of 35mrcool.com
Figure 7.
Figure 8.
Clearances
Type of Vent
Connector
Type C Type B
1
*Front
Back 0 0
Sides 0† 0
0‡ 0‡
Figure 9.
Return Air
WARNING
See Figure 10
507332-02CPage 10 of 35 mrcool.com
Table 1.
Cabinet Width
Front to Rear Side to Side
in. mm in. mm
19-3/4 502
16-5/8 422
20-1/8 511
NOTE
Figure 10.
Installation on Combustible Flooring
See Figure 11
CAUTION
Table 2.
Cabinet
Width
Catalog
Number
Front to Rear Side to Side
in. mm in. mm
11M60
22 559
18-3/4 476
11M61 22-3/4 578
Figure 11.
NOTE:
Installation on Cooling Coil Cabinet
See Figure 12
NOTE:
507332-02C Page 11 of 35mrcool.com
Figure 12.
Figure 13.
Figure 14.
Filters
Duct System
Society of Heating, Refrigerating and Air Conditioning
NOTE:
Supply Air Plenum
Return Air Plenum
NOTE:
Venting
507332-02CPage 12 of 35 mrcool.com
IMPORTANT
NOTE:
IMPORTANT
WARNING
Figure 15. Vent Connection
Venting Using a Masonry Chimney
IMPORTANT
507332-02C Page 13 of 35mrcool.com
DO NOT
Figure 16.
Masonry Chimney
NOTE 1: Refer to the provided venting tables for installations.
Refer to the capacity requirements shown in the provided
venting tables.
•
•
General Venting Requirements
Figure 17. Common Venting Using Tile Lined Interior Masonry Chimney and Combined Vent Connector
NOTE:
507332-02CPage 14 of 35 mrcool.com
Table 3.
Connector Diameter
inches (mm)
Connector Length
feet (m)
3 (76)
4 (102)
5 (127)
6 (152)
7 (178)
507332-02C Page 15 of 35mrcool.com
Table 4.
Capacity of Type B Double Wall Vents with Type B Double Wall Connectors Serving a Single Category I Appliance
Height
H
(feet)
Lateral
L
(feet)
3 inch 4 inch 5 inch 6 inch
Appliance Input Rating in Thousands of Btu per Hour
MIN MAX MIN MAX MIN MAX MIN MAX
6
0 0 78 0 152 0 251 0 375
2 13 51 18 97 27 157 32 232
4 21 49 30 94 39 153 50 227
6 25 46 36 91 47 149 59 223
8
0 0 84 0 165 0 276 0 415
2 12 57 16 109 25 178 28 263
5 23 53 32 103 42 171 53 255
8 28 49 39 98 51 164 64 247
10
0 0 88 0 175 0 295 0 447
2 12 61 17 118 23 194 26 289
5 23 57 32 113 41 187 52 280
10 30 51 41 104 54 176 67 267
15
0 0 94 0 191 0 327 0 502
2 11 69 15 136 20 226 22 339
5 22 65 30 130 39 219 49 330
10 29 59 40 121 51 206 64 315
15 35 53 48 112 61 195 76 301
20
0 0 97 0 202 0 349 0 540
2 10 75 14 149 18 250 20 377
5 21 71 29 143 38 242 47 367
10 28 64 38 133 50 229 62 351
15 34 58 46 124 59 217 73 337
20 48 52 55 116 69 206 84 322
30
0 0 100 0 213 0 374 0 587
2 9 81 13 166 14 283 18 432
5 21 77 28 160 36 275 45 421
10 27 70 37 150 48 262 59 405
15 33 64 44 141 57 249 70 389
20 56 58 53 132 66 237 80 374
30 NR NR 73 113 88 214 104 346
NOTE
507332-02CPage 16 of 35 mrcool.com
Table 5.
Capacity of Type B Double Wall Vents with Single Wall Metal Connectors Serving a Single Category I Appliance
Height
H
(feet)
Lateral
L
(feet)
3 inch 4 inch 5 inch 6 inch
Appliance Input Rating in Thousands of Btu per Hour
MIN MAX MIN MAX MIN MAX MIN MAX
6
0 38 77 59 151 85 243 126 373
2 39 51 60 96 85 158 123 231
4 NR NR 74 92 102 152 146 225
6 NR NR 83 89 114 147 163 220
8
0 37 83 68 164 83 273 123 412
2 39 56 59 108 83 176 121 261
5 NR NR 77 102 107 188 151 252
8 NR NR 90 95 122 161 175 243
10
0 37 67 57 174 82 293 120 444
2 39 61 59 117 82 193 119 287
5 52 56 76 111 105 185 148 277
10 NR NR 97 100 132 171 188 261
15
0 36 93 56 190 60 325 116 499
2 38 69 57 136 80 225 115 337
5 51 63 75 128 102 216 144 326
10 NR NR 95 116 128 201 182 308
15 NR NR NR NR 158 186 220 290
20
0 35 96 54 200 78 346 114 537
2 37 74 56 148 78 248 113 375
5 50 68 73 140 100 239 141 363
10 NR NR 93 129 125 223 177 344
15 NR NR NR NR 155 208 216 325
20 NR NR NR NR 186 192 254 306
30
0 34 99 53 211 76 372 110 584
2 37 80 55 164 76 281 109 429
5 49 74 72 157 98 271 136 417
10 NR NR 91 144 122 255 171 397
15 NR NR 115 131 151 239 208 377
20 NR NR NR NR 181 223 246 357
30 NR NR NR NR NR NR NR NR
NOTE
507332-02C Page 17 of 35mrcool.com
Vent Connector Capacity
Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances
Vent
Height
H
(feet)
Connector
Rise
R
(feet)
3 inch 4 inch 5 inch 6 inch
Appliance Input Rating in Thousands of Btu per Hour
MIN MAX MIN MAX MIN MAX MIN MAX
6
1 22 37 35 66 46 106 58 164
2 23 41 37 75 48 121 60 183
3 24 44 38 81 49 132 62 199
8
1 22 40 35 72 49 114 64 176
2 23 44 36 80 51 128 66 195
3 24 47 37 67 53 139 67 210
10
1 22 43 34 78 49 123 65 189
2 23 47 36 86 51 136 67 206
3 24 50 37 92 52 146 69 220
15
1 21 50 33 89 47 142 64 220
2 22 53 35 96 49 153 66 235
3 24 55 36 102 51 163 68 248
20
1 21 54 33 99 46 157 62 246
2 22 57 34 105 48 167 64 259
3 23 60 35 110 50 176 66 271
30
1 20 62 31 113 45 181 60 288
2 21 64 33 118 47 190 62 299
3 22 66 34 123 48 198 64 309
Table 6.
Common Vent Capacity
Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances
Vent Height
H
(feet)
4 inch 5 inch 6 inch 7 inch
Appliance Input Rating in Thousands of Btu per Hour
FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT
6 92 81 140 116 204 161 309 248
8 101 90 155 129 224 178 339 275
10 110 97 169 141 243 194 367 299
15 125 112 195 164 283 228 427 352
20 136 123 215 183 314 255 475 394
30 152 138 244 210 361 297 547 459
Table 7.
507332-02CPage 18 of 35 mrcool.com
Vent Connector Capacity
Type B Double Wall Vents with Single Wall Metal Connectors Serving Two or More Category I Appliances
Vent
Height
H
(feet)
Connector
Rise
R
(feet)
3 inch 4 inch 5 inch 6 inch
Appliance Input Rating in Thousands of Btu per Hour
MIN MAX MIN MAX MIN MAX MIN MAX
6
1 NR NR NR NR NR NR NR NR
2 NR NR NR NR NR NR 168 182
3 NR NR NR NR 121 131 175 198
8
1 NR NR NR NR NR NR NR NR
2 NR NR NR NR 125 126 184 193
3 NR NR NR NR 130 138 191 208
10
1 NR NR NR NR 119 121 182 186
2 NR NR 84 85 124 134 189 203
3 NR NR 89 91 129 144 197 217
15
1 NR NR 79 87 116 138 177 214
2 NR NR 83 94 121 150 185 230
3 NR NR 87 100 127 160 193 243
20
1 49 56 78 97 115 152 175 238
2 52 59 82 103 120 163 182 252
3 55 62 87 107 125 172 190 264
30
1 47 60 77 110 112 175 169 278
2 51 62 81 115 117 185 177 290
3 54 64 85 119 122 193 185 300
NOTE
Table 8.
Common Vent Capacity
Type B Double Wall Vents with Single Wall Metal Connectors Serving Two or More Category I Appliances
Vent Height
H
(feet)
4 inch 5 inch 6 inch 7 inch
Appliance Input Rating in Thousands of Btu per Hour
FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT
6 N/A 78 N/A 113 200 158 304 244
8 N/A 87 N/A 126 218 173 331 269
10 N/A 94 163 137 237 189 357 292
15 121 108 189 159 275 221 416 343
20 131 118 208 177 305 247 463 383
30 145 132 236 202 350 286 533 446
Table 9.
507332-02C Page 19 of 35mrcool.com
Removal of the Furnace from Common Vent
CARBON MONOXIDE POISONING HAZARD
WARNING
Gas Piping
CAUTION
Gas Supply
IMPORTANT
NOTE:
507332-02CPage 20 of 35 mrcool.com
Table 10.
Nominal Iron
inches (mm)
Internal
Diameter
(mm)
10
(3.048)
20
(6.096)
30
(9.144)
40
(12.192)
50
(15.240)
60
(18.288)
70
(21.336)
80
(24.384)
90
(27.432)
100
(30.480)
1/2
175 120 97 82 73 66 61 57 53 50
3/4 360 250 200 170 151 138 125 118 110 103
1 680 465 375 320 285 260 240 220 205 195
1-1/4 1400 950 770 660 580 530 490 460 430 400
1-1/2 2100 460 1180 990 900 810 750 690 650 620
2 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150
2-1/2 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850
3 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250
NOTE
FIELD
PROVIDED
AND INSTALLED
Left Side Piping
(Standard)
Right Side Piping
(Alternate)
GROUND
JOINT
UNION
DRIP LEG
MANUAL
MAIN SHUT-OFF
VALVE
AUTOMATIC
GAS VALVE
(with manual
shut-off valve)
GROUND
JOINT
UNION
DRIP LEG
MANUAL
MAIN SHUT-OFF
VALVE
AUTOMATIC
GAS VALVE
(with manual
shut-off valve)
NOTE: ONLY
Figure 18.
507332-02C Page 21 of 35mrcool.com
Leak Check
NOTE:
CAUTION
IMPORTANT
Figure 19.
Electrical
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Figure 20.
Figure 21.
507332-02CPage 22 of 35 mrcool.com
NOTE:
NOTE:
Accessory Terminals
•
•
•
•
Thermostat
Figure 22. Condensing Unit Thermostat Designations
* Note:
Indoor Blower Speeds
507332-02C Page 23 of 35mrcool.com
E045A3
E070B3
E090B4
E110C5
Figure 23. Wiring Diagram
507332-02CPage 24 of 35 mrcool.com
Figure 24. Typical Field Wiring Diagram
Figure 25. Integrated Control
(Automatic Hot Surface Ignition System)
Terminal Designations
120 HUM
LINE
XFMR
CIRC
EAC
COOL
HEAT
FAN
PARK
NEUTRALS
FS
24 COM
HUM 24
RED LED
RECALL BUTTON
BLOWER OFF DELAY
507332-02C Page 25 of 35mrcool.com
FOR YOUR SAFETY READ BEFORE LIGHTING UNIT
WARNING
WARNING
WARNING
BEFORE LIGHTING
Placing the Furnace into Operation
WARNING
Gas Valve Operation
See Figure 26
STOP!
STOP!
Figure 26.
Gas Valve Shown in “ON” Position
NOTE:
Turning Off Gas to Unit
Failure To Operate
507332-02CPage 26 of 35 mrcool.com
Heating Sequence of Operation
See Figure 27
Gas Pressure Adjustment
Gas Flow (Approximate)
Table 11.
Gas Meter Clocking Chart
Capacity
Seconds for One Revolution
Natural LP
1 cu ft
Dial
2 cu ft
Dial
1 cu ft
Dial
2 cu ft
Dial
-045 80 160 200 400
-070 55 110 136 272
-090 41 82 102 204
-110 33 66 82 164
NOTE:
Supply Pressure Measurement
Manifold Pressure Measurement
Figure 27. Heating Sequence of Operation
Demand
15
ON
OFF
CAI
35
1
Pre-Purge
Ignitor Warm-up
Blower
“On” Delay
Post
Purge
5 SEC80
Ignitor
Gas Valve
Indoor Blower
39
Trial for
Ignition
507332-02C Page 27 of 35mrcool.com
Table 13. Manifold Pressure Settings and Pressure Switch
Capacity Gas
Line
Pressure
(in. w.c.)
Min. Max.
(in)
Manifold
Pressure
(in w.c.)
Pressure
Switch
(in)
Manifold
Pressure
(in w.c.)
Pressure
Switch
(in)
Manifold
Pressure
(in w.c.)
Pressure
Switch
(in)
Manifold
Pressure
(in w.c.)
Pressure
Switch
045
Nat
No
No
No
No
No
No
51W01
74W89
LP/ 11K50 11K50 11K50 11K45
070
Nat
No No No
51W01
LP/ 11K50 11K50 11K50 11K45
090
Nat
No No No
51W01
LP/ 11K50 11K50 11K50 11K45
110
Nat
No No No 74W60
51W01
LP/ 11K50 11K50 11K50
74W60
11K45
NOTE
NOTE
NOTE:
Proper Combustion
Table 12.
Capacity CO
2
% for Nat. CO
2
% for LP
-045
-070
-090
-110
High Altitude
Other Unit Adjustments
Primary and Secondary Limits
Flame Rollout Switches
Pressure Switch
Temperature Rise
507332-02CPage 28 of 35 mrcool.com
IMPORTANT
Fan Control
Figure 28. Heat Fan Off Time in Seconds
Constant Torque Motor
Thermostat Heat Anticipation
NOTE:
Electrical
Blower Speeds
NOTE:
Electronic Ignition
507332-02C Page 29 of 35mrcool.com
Blower Performance
MGD80SE045A3A Performance (Less Filter)
External
Static
Pressure
in. w.c.
High Medium Low
cfm watts cfm watts cfm watts cfm watts cfm watts
1430 285 1215 180 1035 120 995 110 930 100
1400 285 1175 185 995 130 885 100 850 90
1375 300 1145 200 950 140 840 110 725 85
1335 315 1120 210 915 145 790 115 665 95
1320 325 1075 220 870 155 745 125 625 100
1275 335 1045 230 835 165 715 135 565 105
1245 345 1000 235 785 170 655 140 520 115
1215 355 970 245 745 180 605 150 355 130
1175 365 925 255 695 185 555 155 400 130
MGD80SE070B3A Performance (Less Filter)
External
Static
Pressure
in. w.c.
High Medium Low
cfm watts cfm watts cfm watts cfm watts cfm watts
1475 275 1345 170 1225 135 1185 125 1110 105
1430 290 1275 175 1190 145 1155 135 1005 95
1400 295 1230 190 1125 160 1110 150 900 100
1360 310 1205 205 1085 160 1055 155 845 115
1310 325 1155 210 1050 175 1000 165 790 115
1280 335 1110 220 985 185 950 180 705 130
1250 350 1060 235 935 195 865 185 645 135
1220 355 1000 245 865 205 815 195 590 140
1165 365 935 250 795 210 750 200 480 145
MGD80SE090B4A Performance (Less Filter)
External
Static
Pressure
in. w.c.
High Medium Low
cfm watts cfm watts cfm watts cfm watts cfm watts
1750 385 1550 265 1430 205 1355 185 1195 130
1725 390 1495 270 1390 220 1320 195 1145 140
1695 405 1470 285 1340 235 1280 210 1105 145
1660 415 1425 300 1290 240 1225 215 1040 160
1615 430 1395 310 1250 255 1185 230 1005 170
1570 450 1360 325 1210 265 1145 240 945 180
1545 465 1295 340 1165 280 1085 255 865 185
N/A N/A 1265 350 1120 295 1040 265 810 200
N/A N/A 1215 365 1080 305 1000 275 755 210
507332-02CPage 30 of 35 mrcool.com
MGD80SE110C5A Performance (Less Filter)
External
Static
Pressure
in. w.c.
High Medium Low
cfm watts cfm watts cfm watts cfm watts cfm watts
2410 625 2095 405 1875 295 1700 225 1635 180
2385 630 2100 410 1830 310 1610 240 1505 190
2325 650 2010 440 1760 330 1570 255 1375 195
2280 675 1940 460 1705 340 1500 260 1320 210
2235 690 1895 475 1635 365 1440 285 1265 225
2165 710 1845 490 1595 380 1380 300 1200 235
2125 735 1800 510 1545 390 1320 310 1170 250
2090 740 1755 530 1510 405 1285 325 1100 260
2035 760 1700 540 1460 425 1255 345 1030 275
Allowable Heating Speeds
Model Red Yellow Blue Brown Black
045-3
Factory Setting
070-3 Factory Setting
090-4 Factory Setting
110-5 Factory Setting
Table 14.
Allowable Circulation Speeds
Model Red Yellow Blue Brown Black
Factory Setting
Table 15.
Service
ELECTRICAL SHOCK, FIRE, OR EXPLOSION
HAZARD
WARNING
Blower
WARNING
Filters
507332-02C Page 31 of 35mrcool.com
Flue And Chimney
Electrical
Cleaning the Heat Exchanger and Burners
NOTE:
Figure 29. NOx Inserts
Figure 30. Remove 5 Screws if Necessary
(either side of cabinet)
507332-02CPage 32 of 35 mrcool.com
Figure 31. Burner, Combustion Air Inducer Assembly & Heat Exchanger Removal
CAUTION
507332-02C Page 33 of 35mrcool.com
Planned Service
Fresh air grilles and louvers
Table 16.
Red LED Flash Code
LED Off
1
Not used
1
NOTE
Instruct the homeowners to pay attention to their
furnace
507332-02CPage 34 of 35 mrcool.com
Table 17.
Red LED Flash Code
2
LED Off
1
Not used
1
2
NOTE
Repair Parts List
Cabinet Parts
•
•
•
Control Panel
• Parts Transformer
•
•
•
Blower Parts
•
•
• Motor
• Motor mounting frame
•
•
Heating Parts
•
•
•
•
•
•
•
•
• Ignitor
•
•
•
507332-02C Page 35 of 35mrcool.com
Requirements for Commonwealth of Massachusetts
requirements:
INSTALLATION OF CARBON MONOXIDE
DETECTORS
APPROVED CARBON MONOXIDE DETECTORS.
SIGNAGE
GAS VENT DIRECTLY
BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.
INSPECTION
EXEMPTIONS: The following equipment is exempt
from 24 CMR 5.08(2)(a) 1 through 4:
VENTING SYSTEM PROVIDED.
VENTING SYSTEM NOT PROVIDED.
A copy of all installation instructions for all Product
equipment, all venting instructions, all parts lists
instructions shall remain with the appliance or
equipment at the completion of the installation.
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.
Signature Series
MGD80*SE-XA Warm Air Gas Furnace
ELECTRICIAN and/or HVAC TECHNICIAN:
LICENSE #:
INSTALLATION DATE:
INSTALLATION LOCATION:
SERIAL NUMBER:
