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PYROMASTER® UVHB20 Vent-Free Heaters
20001540
Description
The UVHB20 vent-free heater is designed to be in-
stalled into an FPS1212 or FPS1214 mantel cabinet
only. It may not be installed in any other manner.
The UVHB20 is available in Natural or Propane gas,
equipped with an oxygen depletion sensor with a
standing pilot.
Minimum Clearances
Minimum clearance to combustibles are maintained
when the UVHB20 is installed into the FPS1212 or
FPS1214 mantel cabinets. Top of unit to ceiling mini-
mum 42 inches.
Gas Supply Pressures
This heater must be isolated from the gas supply piping
system by closing its individual manual shut-off valve
during any pressure equal to or less than 1/2 psig (3.45
kPa).
The heater and its individual shut-off valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.45 kPa).
Gas Specifications
Model Fuel Gas Control
Max.
Input
B.T.U.H.
Min.
Input
B.T.U.H.
UVHB20RN Natural Millivolts Hi/Lo 25,000 17,500
UVHB20RP Propane Millivolts Hi/Lo 25,000 18,750
Fig. 2 Gas specifications.
Planning
Planning the installation is an important first step: it will
save time and money later in the actual installation. In
planning the installation, consider:
1. Where the heater will be located.
2. All components needed to complete the
project.
Table 1 Gas supply pressures.
High Elevations
Input ratings are shown in BTU per hour and are
certified without deration from elevations up to
4,500 feet (1,370m) above sea level.
Nuisance outages may occur at altitudes above
4,500 feet (1,370m) if dirt, dust, lint and/or cob-
webs are allowed to accumulate on burner and/or
ODS pilot. Monthly inspection and cleaning is
recommended for altitudes above 4,500 feet
(1,370m)
For elevations above 4,500 feet (1,370m), installa-
tions must be in accordance with the current
ANSI Z223.1 and/or local codes having jurisdic-
tion.
Natural LP
Minimum Inlet Pressure 5.5" w.c. 11.0" w.c.
Maximum Inlet Pressure 14.0" w.c. 14.0" w.c.
Manifold Pressure 3.5" w.c. 10.0" w.c.