Modine Manufacturing MPR - Page 24

24 MCP15-500.7
START-UP PROCEDURE - CONTINUED
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Figure 24.1 - Gas Heat Option Gas Controls - B-Cabinet Sized Units
81% Efficiency Gas Heat Option (Digit 18 = F,G,H, J or K)94% Efficiency Gas Heat Option (Digit 18 = R, S or T)
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
6 Furnace control board
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)
13 Compartment strip heater/thermostat
(94% efficiency furnace only -
not pictured)
15 Heat exchanger tube drain tray with
drain line (80% efficiency furnace only -
not pictured)
16 Convenience outlet (optional feature)
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