C Hecking And Adjusting The Gas Manifold Pressure; C Hecking, Removing And Reassembling Of The Vent Air Intake System; L Ubrication Of Moving Parts; F Lame Visual Check - Williams 1773512 Installation Instructions And Owner's Manual

All servicing activities must be performed by a qualified service t chnician or a service agency. The home owner may not
service the furnace. The home owner must read this section to be informed of the periodic maintenance and checks that ar
required. All servicing (except on vent system) must be performed with the external casing removed. After any servicing, the
external casing must be reinstalled properly.
C hecking and Adjusting the Gas Manifold Pressure
The furnace comes set from the factory at the correct HI and LO gas
recommended to check the pressures periodically (minimum once a year). If adjustment is required, this can be done by
adjusting screws "C" and "D". (Figure 8) A test gauge must be connected as explained in "Checking the Gas Manifold
Pressure".
P roceed as follows:
1. Place the unit in the HI mode.
2. Adjust the HI pressure by turnin
increase the pressure, turn counterclockwise to decrease it.
3. Turn the control knob clockwise until the gas control switches
the actual room temperature.
4. Loosen screw "D" until the cor
counterclockwise to increase it.
5. Switch the unit from LO to HI mo
0.1-inches w.c. on the pressure value is acceptable. Readjust if needed.
6. Disconnect the test gauge and firmly tighten the screw of the gauge conn
T he I and LO pressures must be adjusted as instructed above. Never adjust them independently of each other. H
C hecking, Removing and Reassembling of the Vent Air Intake System
It is essential that the vent air intake system is examined periodically (minimum once a year) to
deposits of solid materials such as leaves or nests. The vent air intake system is checked from outside. Proceed as follows:
1. Remove the vent cap by removing the three outer screws. (Figure 7)
2. Remove the inner flue pipe. Do not use tools; the pipe can be extrac
3. Remove dust and deposits from the vent cap and flue pipes. Deposits in the air pipe
them inside the furnace. The outer air pipe may not be removed from outside.
4. Reinstall the flue pipe from outside. Do not use glue or sealants.
5. Reinstall the vent cap on the flue pipe. Do not use glue or sealants. Tighten the
L ubrication of Moving Parts
This furnace does not require lubrica
screws, etc.
F lame Visual Check
Correct and proper operat
flame viewer. The flame must be stable and have blue color. Some small yellow tips are acceptable with propane gas. If the
flame is yellow or has excessive turbulence, check the gas manifold pressure and the vent air intake system. If these are not
acceptable, call a qualified service technician for a complete check of the furnace. Call also your gas supplier to check the
composition of the gas in use.
g screw "C" (pressure regulator) to the value given in "Technical Data". Turn clockwise to
rect value for the LO pressure is achieved. Turn clockwise to decrease the pressure, turn
de to check that both the HI and LO pressures are correct. A tolerance of plus or minus
tion. Do not try to lubricate any part of the furnace such as motors bearings, keys, knobs,
ion may be checked by examining the burner flame. The flame may be examined through the front
Servicing
e
manifold pressures as shown in "Technical Data". It is
to LO mode. The position in which this occurs depends on
ection, then check for gas leaks from it.
ted by hand.
14
verify it is clean from dust and
must be taken outside. Do not push
three outer screws.
e