Field Controls Power Venter System PVU-300 - Manual (Page 2)

Page 2
UNIT SPECIFICATIONS (See Table 1 and Figure 1)
Table 1
UNIT DIMENSIONS (INCHES)
MODEL “H” “W” “D” I/O*
PVU-300 7.5 11.5 7.0 4/4
* Inlet and outlet diameter.
ELECTRICAL RATINGS
MODEL VAC Hz RPM WATT AMP TP**
PVU-300 115 60 3000 145 2.1 YES
** Thermally protected motor.
SIDEWALL VENT HOODS (Model SWH-1)
Sidewall vent hoods are available in the following sizes. The vent hood should be chosen that
matches the outlet size of the Power Venter. (See Figure 2) NOTE: When using different sizes
consider reducers and specific size pipe when determining equivalent length of vent pipe.
SWH-1-3 - 3 inch
SWH-1-4 - 4 inch
SWH-1-5 - 5 inch
SWH-1-6 - 6 inch
SWH-1-8 - 8 inch
SYSTEM OPERATION
1. The thermostat (wall thermostat, or aquastat) calls for heat and energizes a relay, which
activates the power venter. After the venter motor has come up to speed, the pressure switch closes. This completes
the circuit to the burner and allows the burner to fire.
2. For millivolt controlled water heaters, the gas pressure switch on the gas valve activates the power venter at the same
time as the burner fires.
3. After the heating requirement has been satisfied, the thermostat circuit will open and de-activate the burner and power
venter circuit.
4. The post purge timer continues to run the power venter for a period of time after the burner has shut off to purge
remaining flue gases.
POWER VENTER SIZING
In order to choose the correct size power venter for a particular installation, the total input firing rate and total equivalent
length of vent pipe to be used must be known. Refer to Table 2 to determine the maximum allowable equivalent feet of
pipe for each model used with the pipe diameters shown. When venting multiple appliances, add the input of each
appliance to determine the total input. Always choose a power venter that is capable of handling more than the system
requires. The choke plate can be adjusted to compensate for the difference.
Table 2
MAXIMUM EQUIVALENT HORIZONTAL PIPE
LENGTH (FEET)
VENTER MODEL NO. AND
VENT PIPE DIAMETER
PVU-300
BTU/HR INPUT
4” 5” 6”
100,000 305 --- ---
145,000 145 247 334
220,000 64 100 147
310,000 --- 54 74
Figure 2
Figure 1