Modine Manufacturing MPR Series Installation And Service Manual page 26

START-UP PROCEDURE - CONTINUED
Figure 26.1 - Gas Heat Option Gas Controls - B-Cabinet Sized Units
1.
Power exhauster
2. Maxitrol EXA STAR modulating gas valve
3. Main combination gas valve
4. High limit control (hidden behind Item #2
on 80% efficiency furnace)
5. Solid state ignition control board (cover
removed)
6.
Furnace control board (cover removed)
26
16
6
7
5
9
10
11
16
11
10
9
6
7
7.
Vent differential pressure proving switch
8. Direct spark ignitor
9. Manifold pressure tap on manifold tee
10. Flame sensor
11. Manifold piping with gas orifices
12. Condensate drain float switch
(94% efficiency furnace only)
1
4
2
15
2
4
1
12
MCP15-500.9
3
8
8
3
5
13. Compartment strip heater/thermostat
(94% efficiency furnace only - not
pictured)
14. Not applicable
15. Heat exchanger tube drain tray with
drain line (80% efficiency furnace only -
not pictured)
16. Convenience outlet (optional feature)