Grain Systems PNEG-1472 - Manual (Page 23)

4. Installation Instructions
PNEG-1472 L & B Series Field Installation 23
5. Fuel Plumbing Assembly
The fuel inlet manifold assembly has been shipped pre-assembled. LP model dryers also include a
vaporizer plumbing assembly and will require assembly. Use a teflon paste pipe sealer on fuel pipe
threads.
The fuel manifold assembly should be assembled as follows:
1. Install support bracket 401-3946-1 on the underside of the front frame channel of the fan-heater
module directly beneath the existing plumbing on the fan-heater module using 5/16” bolt (S-6606)
and 5/16” nut (S-3611). See Figure 4I.
2. Install connecting pipe assembly D04-0419 to lower pipe coupler on the fan-heater module.
Secure connecting pipe to bracket installed in step 1 with U-bolt (090-1485-3).
3. Install support bracket 401-3946-1 loosely to the manifold assembly next to the Maxon valve with
U-bolt (090-1485-3). See Figure 4I. Lift the manifold assembly in place and connect the union.
Adjust the support bracket so that it lines up with the holes in the support leg and install using 5/
16” bolts (S-6606) and 5/16” nuts (S-3611).
4. Now fully tighten the union that was connected in step 3.
5. Install conduit assembly D04-0483 to the unilet “T” on the 2 inch valve. Connect the white wire to
one lead of each valve. Connect the black/white wire to the remaining lead of the 1 inch valve.
Connect the brown/white wire to the remaining lead of the 2 inch valve.
6. Install the pressure gauges as shown in Figure 4I. Use a teflon paste pipe sealer on fuel pipe
threads.
7. The Natural Gas supply line may now be installed. NG should be supplied at a regulated pressure
of 10 psi. If the fuel supply is liquid propane, see the following instructions for vaporizer plumbing
installation. If an external vaporizer is used, a propane vapor supply line regulated to 10 psi may
be installed at this time.