Comfort-aire Gmuh75e-4a, Gmuh75e-3a, Gmuh50e-3a, Gmuh150e-5a, Gmuh125e-5a Owner's Manual

Table of Contents

Model Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3

Parts Numbers

Panels - Miscellaneous. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4

Electrical Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5

Blower Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6

Heat Exchanger-Burner Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7

Gas Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8

Orifice Selection Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9

Drawings/Photographs

Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10

Blower Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11

Burner Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12

Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

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				MODEL NUMBER EXPLANATION
G	M	U	H	-	5	0	E	3	A
1	2	3	4			5		6	7

(1)GAS

(2)80% EFFICIENCY

(3)UPFLOW/HORIZONTAL NON-CONDENSING

(4)PLACEHOLDER

(5)HEATING INPUT DESIGNATION

50 = 50,000 BTU/HR

75 - 75,000 BTU/HR	E = Electric
100 = 100,000 BTU/HR	N = NOX
125 = 125,000 BTU/HR
150 = 150,000 BTU/HR

(6)DRIVE NOMINAL COOLING/REVISION LEVEL

3 = 3 Ton

4 = 4 Ton

5 = 5 Ton

(7)REVISION LEVEL

					SERIAL NUMBER EXPLANATION
G	K	5	D	7	0	7	F	3	1	0	6	9	9	9	9
	1	2	3	4	5	6	7		8		9			10
	1	GAS CODE						6	MOTOR HORSEPOWER
	2	LIMIT CONTROL						7	PLANT
	3	BLOWER						8	WEEK
	4	HEATING ELEMENT						9	YEAR
	5	SPECIAL AREA REQUIREMENT						10	PRODUCTION NUMBER

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	MODEL	GMUH	GMUH	GMUH	GMUH
No. Notes HEATING INPUT		50E	75E	75E	100E
	VARIATIONS	3A	3A	4A	3A
		PANELS, SHEET METAL, MISCELLANEOUS
1	Plug Button (2)	45-22980-01	45-22980-01	45-22980-01	45-22980-01
	Sight Glass	68-21893-03	68-21893-03	68-21893-03	68-21893-03
2	Burner Compartment Door	AE-101096-08	AE-101097-08 AE-101097-08 AE-101097-08
3	Blower/Filter Door	AS-67893-10	AS-67894-10	AS-67894-10	AS-67894-10
	Thumbscrew and Insert Kit	64-24081-81	64-24081-81	64-24081-81	64-24081-81
4	Door Switch - Push Button	42-22692-01	42-22692-01	42-22692-01	42-22692-01
5	Junction Box	AE-61475-02	AE-61475-02	AE-61475-02 AE-61475-02
6	Junction Box Cover	AE-61476-02	AE-61476-02	AE-61476-02 AE-61476-02
7	Induced Draft Blower		See Electrical Group
8	Blower Assembly		See Blower Group
9	Jacket	AS-61690-17	AS-61690-18	AS-61690-18 AS-61690-18
10	Heat Exchanger Bracket		See Heat Exchanger Group
11	Heat Exchanger		See Heat Exchanger Group
12	Top Plate	AE-101508-01 AE-101508-02		AE-101508-02 AE-101508-02
13	Limit - Main Limit (Heat Exchanger Panel)		See Electrical Group
14	Silicone Rubber Tubing (Pressure Switch)	AE-61737-27	AE-61737-27	AE-61737-27 AE-61737-27
15	Pressure Switch		See Electrical Group
24	Control Mounting Plate	AE-67877-01	AE-67877-01	AE-67877-01 AE-67877-01
26	Burner Cover Plate		See Heat Exchanger Group
	Rear Baffle	AE-61666-01	AE-61607-01	AE-61607-01 AE-61607-01
	Side Baffle (2)	AE-61606-01 AE-61606-01 AE-61606-01 AE-100548-01
	Touch-up Paint - Platinum (Aerosol)	523012	523012	523012	523012
	Touch-up Paint - Platinum (Paint Pens)	523013	523013	523013	523013
	Touch-up Paint - Gray (Aerosol)	523014	523014	523014	523014
	Touch-up Paint - Gray (Paint Pens)	523015	523015	523015	523015
	MODEL	GMUH	GMUH	GMUH
No. Notes HEATING INPUT		100E	125E	150E
	VARIATIONS	5A	5A	5A
		PANELS, SHEET METAL, MISCELLANEOUS
1	Plug Button (2)	45-22980-01	45-22980-01	45-22980-01
	Sight Glass	68-21893-03	68-21893-03	68-21893-03
2	Burner Compartment Door	AE-101098-08 AE-101099-08 AE-101099-08
3	Blower/Filter Door	AS-67895-10	AS-67896-10 AS-67896-10
	Thumbscrew and Insert Kit	64-24081-81	64-24081-81	64-24081-81
4	Door Switch - Push Button	42-22692-01	42-22692-01	42-22692-01
5	Junction Box	AE-61475-02	AE-61475-02 AE-61475-02
6	Junction Box Cover	AE-61476-02	AE-61476-02 AE-61476-02
7	Induced Draft Blower		See Electrical Group
8	Blower Assembly		See Blower Group
9	Jacket	AS-61690-20	AS-61690-26 AS-61690-26
10	Heat Exchanger Bracket		See Heat Exchanger Group
11	Heat Exchanger		See Heat Exchanger Group
12	Top Plate	AE-101508-03 AE-101508-04		AE-101508-04
13	Limit - Main Limit (Heat Exchanger Panel)		See Electrical Group
14	Silicone Rubber Tubing (Pressure Switch)	AE-61737-03	AE-61737-23 AE-61737-23
15	Pressure Switch		See Electrical Group
24	Control Mounting Plate	AE-67877-01	AE-67877-01 AE-67877-01
26	Burner Cover Plate		See Heat Exchanger Group
	Rear Baffle	AE-61667-01	AE-61670-01 AE-61669-01
	Side Baffle (2)	AE-61668-01	AE-61665-01	N/A
	Touch-up Paint - Platinum (Aerosol)	523012	523012	523012
	Touch-up Paint - Platinum (Paint Pens)	523013	523013	523013
	Touch-up Paint - Gray (Aerosol)	523014	523014	523014
	Touch-up Paint - Gray (Paint Pens)	523015	523015	523015

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