20
the boiler supplies hot water to heating coils in air handler units, flow control valves or other devices must
be installed to prevent gravity circulation of boiler water in the coils during the cooling cycle. Chilled water
medium must be piped in parallel with the boiler.
Freeze protection for new or existing systems must use glycol specifically formulated for this purpose.
This glycol must include inhibitors that will prevent it from attacking metallic system components. Make
certain that the system fluid is checked for the correct glycol concentration and inhibitor level. The system
should be tested at least once a year and as recommended by the producer of the glycol solution.
Allowance should be made for the expansion of the glycol solution in the system piping. Example: 50% by
volume glycol solution expands 4.8% in volume for the temperature increase from 32
o
F to 180
o
F, while
water expands 3% over the same temperature rise.
Never use dielectric unions or galvanized steel fittings when connecting to a stainless steel storage tank
or boiler. Failure to follow this instruction can lead to premature failure of the boiler system. Such failures
ARE NOT covered by warranty.
Summary of Contents for Mod Con 300 HL
Page 13: ...13 Figure 2 ...
Page 31: ...31 Figure 13 ...
Page 37: ...37 J SIDEWALL VENTING DIAGRAMS Figure 16 Sidewall Venting with Tee and Coupling ...
Page 38: ...38 Figure 17 Sidewall Venting Diagrams ...
Page 39: ...39 K VERTICAL VENTING DIAGRAMS Figure 18 Two Pipe Roof Venting with Tee and Coupling ...
Page 40: ...40 Figure 19 Roof and Sidewall Venting with Stainless Steel ...
Page 44: ...44 E GAS VALVE Figure 21 ...
Page 45: ...45 Figure 22 ...
Page 55: ...55 Figure 28 Mod Con Internal Connection Diagram ...
Page 73: ...73 Figure 32 ...
Page 74: ...74 Figure 33 ...
Page 75: ...75 Figure 34 ...
Page 76: ...76 Figure 35 ...
Page 77: ...77 Figure 36 ...
Page 80: ...80 ...
Page 81: ...81 ...
Page 82: ...82 MAINTENANCE NOTES ...