Hearthstone Quality Home Heating Products, Inc.
WAITSFIELD Model 8770
22
Pilot Adjustment
CAUTION: THE PILOT FLAME SHOULD ONLY BE
ADJUSTED BY AN AUTHORIZED SERVICE
TECHNICIAN.
The pilot flow adjustment is preset to maximum at
the factory. The pilot flame should envelope 3/8” to
1/2”
of the thermocouple
(see Figure 17).
To adjust pilot:
1. The adjustment screw can be reached through a
hole in the MANUAL knob
(see Figure 18).
2. Turn the MANUAL knob to the ON position.
3. It is now possible to pierce through a film on the
cover with a screwdriver to reach the adjustment
screw beneath.
4. Turn the adjustment screw clockwise to
decrease or counter-clockwise to increase pilot
flame.
Figure 17 - Pilot Flame Pattern
Controlling the Waitsfield manually or by the optional
remote become erratic, nonexistent, or the unit may
go out, if the pilot flame is too small or misdirected
away from the thermopile.
WARNING: THE CONTROL HAS AN INTERLOCK
DEVICE. IF THE STOVE HAS BEEN LIT, IT WILL
NOT RELIGHT AGAIN IMMEDIATELY. AFTER
SHUTTING OFF ALL GAS FLOW, THE PILOT
BURNER
CANNOT
BE
RELIT
UNTIL
THE
THERMOCOUPLE HAS COOLED (
60 SECONDS
TO 2 MINUTES)
.
Outlet Pressure Adjustment
CAUTION: THE VALVE MAXIMUM OUTLET
PRESSURE SHOULD ONLY BE ADJUSTED BY AN
AUTHORIZED SERVICE TECHNICIAN AND IS
PRE-SET AT THE FACTORY.
1. Connect a pressure manometer to the valve
outlet pressure tap. Pressure tap is opened by
turning the screw counter-clockwise
(see Figure
15).
2. Turn MANUAL knob and main valve knob to the
ON position.
3. Turn pressure regulator adjustment screw to set
required burner pressure (high fire). Pressure is
increased by turning clockwise. (pressure
regulator models), or decreased by turning
counter-clockwise.
4. After adjustment, replace the plug.
5. If no other adjustments are required, close
pressure tap(s) by turning the screw(s) fully
clockwise until snug. Check all
connections/pressure tap(s) for leaks.
6. If the desired outlet pressure or flow cannot be
achieved by adjusting the gas valve, check the
gas valve inlet pressure using a manometer at
the valve inlet pressure tap. If the inlet pressure
is in the normal range, replace the gas valve;
otherwise, take necessary steps to assure
proper gas pressure to the valve.
Minimum Gas Flow Adjustment
CAUTION: THE MINIMUM VALVE OUTLET
PRESSUrE SHOULD ONLY BE ADJUSTED BY AN
AUTHORIZED SERVICE TECHNICIAN AND IS
PRE-SET AT THE FACTORY.
a. Light the stove and engage the main burner.
b. Set the control into low fire setting by quickly
pressing the Low Flame button twice.
c. The minimum rate can be set either by screwing
in a calibrated minimum rate screw (LP, fixed
orifice) or an adjustable minimum rate screw
(NG). For the NG adjustable rate screw, turn
the screw clockwise to decrease or counter-
clockwise to increase the minimum flow. Once
the Waitsfield has been converted to LP with the
fixed rate low flow orifice, the low rate is not
adjustable.
Changing the fuel type
Convertible regulators are designed to deliver either
of two fixed outlet pressures for Natural Gas (NG) or
LP Gas. To change from one gas to the other, turn
the outlet pressure screw housing
(see Figures 18 &
19)
counter-clockwise to remove.
Be careful not to
engage the small flat slot on the screw itself but
use the larger slot of the screw housing to
remove the unit.
Unsnap and remove the plastic
part, rotate it 180°, and then slide it back on the
conversion plug until it snaps. Reinstall the
