Packaged Rooftop Ventilator
13
Manufacturer recommends that electrical service and
gas supply be brought into the cabinet through the
end wall, as shown below. There are three penetrations
into the cabinet that are required; one for high voltage
supply wiring, one for low voltage control wiring and one
for either gas supply or high voltage supply wiring for an
electric heater.
Recommended Gas and Electric Supply Entry Locations
Optional Unit
Disconnect
Field Wiring
Indirect
Gas
Supply
Location
Alternate Supply Entry Locations
Each installation is unique and as a result, alternate
entry locations may be field-located. Before using any
alternate entry location, verify the suitability of the
location and ensure the use of an alternate location
does not interfere with unit wiring, components or
functionality.
WARNING
Never drill holes in the roof of the unit! There is high
voltage wiring located between the inner and outer
roof panels. Damage to the wiring could cause severe
bodily harm or death.
Optional Gas Piping
Units with indirect gas-fired furnaces require field-
supplied and installed gas supply piping.
Typical Gas Supply Piping Connection
Ground
Joint
Union
8 in. Trap
Gas to
Controls
From Gas Supply
Bleeder Valve or
1/8 in Plugged Tap
Gas Cock
Gas Connections
If this unit is equipped with an indirect gas-fired furnace,
connection to an appropriate gas supply line will be
required. For complete information on installation
procedures for the optional gas furnace, refer the XPVF/
XPVG Indirect Gas-Fired Heat Module Installation,
Operation, and Maintenance Manual.
NOTE
XRV-110 gas furnaces are designed for gas pressure
of 5-13.5 in. wg for natural gas (6-inch minimum on
single 500 and 600 MBH furnaces) and 11-13.5 in. wg
for LP. If the gas pressure at the job location is greater
than 13.5 in. wg, an additional regulator is required
to reduce pressure. For other models, reference the
Model XPVF and XPVG IOM.
Recommended Electrical and Gas Supply Entry Locations
Housing
Size
Total Heating
Capacity
(Input in MBH)
Gas
Connection
Size
Max Gas
Pressure
10
75
¾” NPT
14 in. wg.
100
150
200
25
100
¾” NPT
14 in. wg.
200
300
45
300
¾” NPT
14 in. wg.
400
500
75
600
¾” NPT
14 in. wg.
800
1000
1” NPT
1200
110
600
1” NPT
13.5 in. wg.
800
2” NPT
1000
1200
NOTE
Only applies to Heatco furnaces in the 75 housing
size. A ¼” NPT condensate drain connection is
provided in the flue box for duct furnaces with vertical
or horizontal top mounted burner trays, to remove
condensate from inside the heat exchanger. Since
heat exchangers are under negative pressure, a
P-trap should be used when connecting condensate
drain lines. Metal condensate drain lines should have
corrosion resistance at least equal to that of 304 SS.
