Daikin MPS040 F - Page 29

Gas Pipe Manifold Pressure Adjustment for Propane Gas Fuel:
For Two Stage Furnace:
1. Read gas pressure at the Inlet Pressure Tap of the
Honeywell VR8305Q Gas Safety Control Valve (Figure
25) and conrm pressure is at 11.0" wc. Adjust upstream
pressure reducing gas regulator as required to obtain
11.0" wc gas pressure.
2. The gas pipe manifold pressure for high re (stage
#2) should be set at 8.2" wc. Adjust the High Pressure
Adjustment Honeywell VR8305Q Gas Safety Control
Valve (Figure 25) as required. Screwing the adjustment
clockwise will increase pressure; counter clockwise will
decrease pressure.
3. The gas pipe manifold pressure for low re (stage #1)
should be set at 2.05" wc. Adjust the Low Pressure
Adjustment Honeywell VR8305Q Gas Safety Control
Valve (Figure 25) as required. Screwing the adjustment
clockwise will increase pressure; counter clockwise will
decrease pressure.
For Modulating Furnace:
1. Read gas pressure at the Inlet Pressure Tap of the
Honeywell VR8305Q Gas Safety Control Valve (Figure
25) and conrm pressure is at 11.0" wc. Adjust upstream
pressure reducing gas regulator as required to obtain
11.0" wc gas pressure.
2. The gas pipe manifold pressure for high re should be set
at 8.2" wc. Adjust the High Pressure Adjustment on the
Honeywell VR8305Q Gas Safety Control Valve (Figure
25) as required. Screwing the adjustment clockwise
will increase pressure; counter clockwise will decrease
pressure.
3. The gas pipe manifold pressure for low re (stage #1)
should be set at 0.51" wc.
Adjust the Low Pressure Adjustment on the Honeywell
VR8305Q Gas Safety Control Valve (Figure 25) as
required until pressure at the Honeywell VR8305Q Gas
Safety Control Valve Outlet Pressure Tap reads 0.51"
wc. Screwing the adjustment clockwise will increase
pressure; counter clockwise will decrease pressure.
Adjust the Maxitrol M520B Modulating Valve (Figure 26)
Low Flow Adjustment screw until the gas pipe manifold
pressure reads 0.51" w.c.
oPTIonal Gas heaT
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