9
PYROMASTER
®
UVHB20 Vent-Free Heaters
20001540
Operating Instructions
First Firing
Upon completing the gas line connection, a small
amount of air will be trapped in the line. When first
lighting the unit with pilot light, it will take a few minutes
to purge the trapped air. Once purging is complete, the
pilot and burner will light and operate as indicated in the
instruction manual. Subsequent lightings of the appli-
ance will not require purging.
When lit for the first time, the appliance will emit a slight
odor for an hour or two. This is due to paint and lubri-
cants used in the manufacturing process. After each
lighting, vapor may condense and fog the glass; this
moisture disappears within a few minutes of burning.
PILOT
ON
OFF
LO
HI
TPTH
TH
TP
Fig. 9 Honeywell valve and pilot assembly.
HV101a
Main Control
Black
Jumper
White
Red
Pressure Tap
Piezo
Ignitor
Regulator
Fig. 11 Proper pilot flame height.
P102
Flame Adjustment
For units equipped with Hi/Lo valves, flame adjustment
is accomplished by rotating the Hi/Lo adjustment knob
located near the center of the gas control. (Fig. 12)
It is important to periodically perform a
visual check of the pilot and the burner
flames. (Figures 11 and 13)
Fig. 12 Flame adjustment on gas valve.
HV102
LO
HI
Turn
counterclockwise
to increase
flame height
Turn clockwise
to lower
flame height
Fig. 13 Approximate flame heights.
LG111
