6
5
7
4
3
2
1
33
32
31
19
20
21
30
29
28
Upflow/Horizontal
(GUCA/GULA Models)
1 Gas Valve
2 Gas Line Entrance (Alternate)
3 Pressure Switch
4 Gas Manifold
5 Combustion Air Intake Connection / "Coupling"
6 Hot Surface Igniter
7 Rollout Limit
8 Burners
9 Flame Sensor
10 Flue Pipe Connection / "Coupling"
11 Flue Pipe (Internal)
12 Combustion Air Intake (Alternate)
13 Primary Limit
14 Gas Line Entrance
15 Flue Pipe Connection (Alternate)
16 Rubber Elbow
17 Induced Draft Blower
18 Electrical Connection Inlets (Alternate)
I. Component Identification
8
9 10
7
11
3
13
14
16
17
20
23
24
25
26
27
5
34
26
12
25
15
24
18
3
23
19
33
31
21
32
19
22
20
21
14
13
9
19 Coil Front Cover Pressure Tap
20 Coil Front Cover Drain Port
21 Drain Line Penetrations
22 Drain Trap
23 Blower Door Interlock Switch
24 Capacitor
25 Integrated Control Module
(with fuse and diagnostic LED)
26 24-Volt Thermostat Connections
27 Transformer (40 VA)
28 Circulator Blower
29 Bottom Return Filter Retainer
30 Auxiliary Limit
31 Junction Box
32 Electrical Connection Inlets
33 Coil Front Cover
34 Combustion Air Inlet Pipe
5
27
28
*
*
*
*
*
*
6
8
4
7
7
Counterflow/Horizontal
(GCCA Models)
10
11
30
3
16
15
18
17
12
19
20
21
2
22
1