Modine Manufacturing Atherion MPR Installation And Service Manual Supplement page 11

GAS HEAT OPTION COMPONENT LOCATION
Figure 11.1 - Gas Heat Option Gas Controls - C-Cabinet Sized Units
12 5
15
13
12
5
1. Power exhauster
2. Maxitrol EXA STAR modulating gas valve
(right-hand furnace only)
3. Main combination gas valve
4. High limit control
5. VB1285 primary furnace control board
(for right-side furnace, but located on left side of cabinet)
6. Valve state relay to Carel controller (90% furnaces only)
7. Secondary furnace control board (for left-side furnace)
8. Direct spark ignition control board (cover removed)
9.
Vent differential pressure proving switch
Left Furnace
(Secondary)
1
9
4
13
Left Furnace
(Secondary)
3
4
1
6
9
14
ATH15-501.0 (Supplement to ATH15-500.10)
7
8
3
11
10 10
15
7
12
10
3
16
14
10. Direct spark ignitor
(behind control boards on 90% furnaces)
11. Manifold tee pressure tap (primary furnace only)
12. Flame sensor (behind #5 on left hand 81% furnaces)
13. Manifold piping with gas orifices
14. Condensate drain float switches
15. Heat exchanger tube drain tray with drain line
(81% furnaces only)
16. Compartment strip heater/thermostat
(90% furnaces only)
Right Furnace
(Primary)
1
9
2 3
4
13
Right Furnace
(Primary)
13
8
2
11
4
(behind pipe)
1
9
12
15
10
11