Lanair MX300 - Manual (Page 22)

Section 7 - Air Supply Installation
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General Requirements
1. Install an air pressure supply line connection to the air filter/regulator on the rear of the
heater.
2. The air supply source must be capable of producing 2.0 CFM @ 60 PSI.
3. Install a shut off valve in the air supply line for service.
4. Install a primary air filter/regulator with a gauge (capable of reading line pressure) in the
air supply line prior to the air filter/regulator mounted on the furnace. The primary air fil-
ter/regulator is not supplied with the furnace.
5. If the primary air regulator does not have a filter with a bowl, a condensate drain leg
must be installed in the air supply line.
6. Install a quick disconnect at the air filter/regulator on the furnace for service.
7. For the ease of installation install a flexible airline (.250 I.D. minimum) from the quick
disconnect to the primary air regulator.
8. The air supply line must be pitched uphill from the primary regulator to the furnace to
prevent condensation from entering your burner.
9. Open all air shut off valves, and set the primary air regulator at 30 PSI.
10. Set the air filter/regulator on the front of the furnace to 18 LBS. See illustration below
(Fig. 5) for a typical air pressure supply installation.
5
10 15
20
25
Figure 5
secondary air filter/
regulator (included)
air inlet
bottom of burner
to primary air filter/regulator (not included)
and air supply