Empire VFIL18N, Installation Instructions And Owner'S Manual, Page: 6 / 40

26532-2-0410 Page 6
PRODUCT SPECIFICATIONS
Water vapor is a by-product of gas combustion. An unvented room
heater produces approximately one (1) ounce (30ml) of water for
every 1,000 BTU's (.3KW's) of gas input per hour.
Unvented room heaters must be used as supplemental heat (a
room) rather than a primary heat source (an entire house). In most
supplemental heat applications, the water vapor does not create a
problem. In most applications, the water vapor enhances the low
humidity atmosphere experienced during cold weather.
The following steps will help insure that water vapor does not
become a problem.
1. Be sure the heater is sized properly for the application, including
ample combustion air and circulation air.
2. If high humidity is experienced, a dehumidifier may be used
to help lower the water vapor content of the air.
3. Do not use an unvented room heater as the primary heat source
(an entire house).
WATER VAPOR: A BY-PRODUCT OF UNVENTED ROOM HEATERS
Model Gas Valve Type
Regulator Pressure
Setting
Gas Inlet Pressure
Max
Gas Inlet Pressure
Minimum
VFRL(18,24,30)
Natural
Millivolt
3.5" W.C. 10.5" W.C. 4.5" W.C.
Propane 10.0" W.C. 13.0" W.C. 11.0" W.C.
VFRL1810
Natural
Millivolt
3.5" W.C. 10.5" W.C. 45.0" W.C.
Propane 10.0" W.C. 13.0" W.C. 11.0" W.C.
VFIL18
Natural
Intermittent Pilot
4.0" W.C. 10.5" W.C. 4.5" W.C.
Propane 10.0" W.C. 13.0" W.C. 11.0" W.C.
VFIL(24,30)
Natural
Intermittent Pilot
3.5" W.C. 10.5" W.C. 4.5" W.C.
Propane 10.0 W.C. 13.0" W.C. 11.0" W.C.
Model BTU/hr.
Maximum Rate
BTU/hr.
Medium Rate
BTU/hr.
Minimum Rate
Air Shutter
Opening
VFRL1810N 10,000 N/A N/A Closed
VFRL1810P 10,000 N/A N/A 1/8" Dia. Pin
VF(RL,IL)18N 26,000 N/A 19,000 Closed
VF(RL,IL)18P 26,000 N/A 20,500 1/8"
VF(RL,IL)24N 36,000 N/A 24,000 Closed
VF(RL,IL)24P 36,000 N/A 27,000 1/8"
VF(RL,IL)30N 40,000 N/A 28,000 Closed
VF(RL,IL)30P 40,000 N/A 30,000 1/8"
Note: Thermostats are for Vent-Free Applications only.