4
9. Check inlet gas pressure. With the power and gas
off, connect a water manometer or adequate gauge
to the inlet pressure tap of the gas valve. With the
power and gas on, put the unit into heating cycle
and turn on all other gas consuming appliances. For
propane gas the inlet gas pressure should be be-
tween 11.0 and 13.0 inches W.C.
10. Required input rating at standard altitude:
Single Stage Units
Input Ratings (Standard Altitude)
Model Input BTU/HR
GUIA, GUIB, GUIC,
GCIA, GCIB, GCIC
GCD, GDC
PGB**C, PGD**C
045 41,400
GUC, GUD, GUX, GCC 045 40,500
GUIA, GUIB, GUIC,
GCIA, GCIB, GCIC
GCD, GDC
PGB**C, PGD**C
070 62,100
GUC, GUD, GUX, GCC 070 63,000
GUIA, GUIB, GUIC,
GCIA, GCIB, GCIC
GCD, GDC
PGB**C, PGD**C
090 82,800
GUC, GUD, GUX, GCC 090 81,000
GUIA, GUIB, GUIC,
GCIA, GCIB, GCIC
GCD, GDC
115 103,500
GUC, GUD, GUX, GCC 115 103,500
GUIA, GUIB, GUIC,
GCIA, GCIB, GCIC
140 124,200
Table 2
Two Stage Units
Input Ratings (Standard Altitude)
Model
High Stage
Input BTU/Hr
Low Stage
Input BTU/Hr
GUIS, GCIS 70 62,100 48,000
GUIS, GCIS 90 82,800 64,000
GUIS 115 103,500 80,000
GUIS 140 124,200 96,000
Table 3
11. On single stage units, set the manifold pressure to
10.0 W.C. (water column). For direct vent (GUD,
GCD) furnaces, see Setting GUD and GCD Mani-
fold Pressure before setting pressure (Figure 10).
On two stage units, adjust the high stage manifold
pressure to 10.0 W.C. and the low stage manifold
pressure to 6.0 W.C. (Figure 7). The White Rodg-
ers 36E96 gas valve requires a 3/32 allen wrench
to adjust the manifold pressures.
A tapped opening is provided in the gas valve to
facilitate measurement of the manifold pressure. A
"U Tube manometer having a scale range from 0
to 12 inches of water column should be used for
this measurement. The manifold pressure must be
measured with the burners operating, and with the
burner box cover (cover not used on all models) in
place.
To adjust the pressure regulator, remove the ad-
justment screw or cover on the gas valve. Turn out
(counterclockwise) to decrease pressure, turn in
(clockwise) to increase pressure. Only small varia-
tions in gas flow should be made by means of the
pressure regulator adjustment. In no case should
the final manifold pressure vary more than plus or
minus 0.3 inches water column from the specified
pressure. Any major changes in flow should be
made by changing the size of the burner orifices.
12. Verify the gas input rate by checking that the appro-
priate orifices have been installed and the manifold
pressure has been set as stated in these instruc-
tions.
13. The burner flames should be stable, soft and blue
(dust may cause orange tips but they must not be
yellow). They should extend directly outward from
the burners without curling, floating, or lifting off.
Check unit temperature rise as described in the
installation manual; temperature rise must be within
the range shown on the furnace rating plate.
14. Check the normal operating sequence of the igni-
tion system to insure burners light properly.
15. Attach the label (found in the spring kit), indicating
propane gas conversion, to the gas valve.
16. Attach conversion data plate, with correct input
rating, adjacent to the unit rating plate.
17. Post conversion date certificate adjacent to the
furnace.
Due to policy of continual product improvement, the
right is reserved to change specifications and design
without notice.
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