LAARS Mighty Venter MV5 (Sizes 500-1825) - Install and Operating Manual - Manual (Page 8)

LAARS Heating Systems
Page 8
3c. Fan Proving Switch Installation
NOTE: If installing the MV2, the fan proving
switch is factory installed. This section does not apply.
Test Port: the fan proving switch on the MV3,
MV4, and MV5 includes a test port which can be used
to measure the pressure in the switch. The black
plastic cap over this test port must be in place during
regular operation of the Mighty Venter.
The fan proving switch installation procedure for
the MV3 is as follows:
1. Mount the fan proving switch to a flat surface
within 4 feet (1.2m) of the Mighty Venter.
NOTE: It is important that the fan proving
switch be mounted in a vertical position.
2. Connect the ¼" aluminum tubing from the fan
proving switch to the Mighty Venter housing
using provided fittings.
The fan proving switch installation procedure for
the MV4 and MV5 is as follows:
1. Mount the supplied electrical box to a flat
surface within 4 feet (1.2m) of the Mighty
Venter. NOTE: It is important that the electrical
box is mounted so that the fan proving switch is
in a vertical position.
2. Connect the ¼" aluminum tubing from the fan
proving switch to the Mighty Venter housing
using provided fittings.
3d. Wiring
WARNING
All wiring from the Mighty Venter to the appliance
must be in compliance with local codes or in their
absence, the National Electric Code (NFPA #70) in
the United States and the CSA C22.1 Electrical
Code in Canada
a) Connect the black and white (120 VAC) leads
from the Mighty Venter to the boiler control box.
Connect these leads with wire nuts to the boiler
circuit as shown in Figure 5. NOTE: If correctly
wired (as shown in Figure 5), the power to the
Mighty Venter will be disconnected if the boiler
toggle switch is turned off.
b) Connect the red, blue and orange (24 VAC)
wires to the terminal blocks as shown in
Figure 5.
c) Remove the factory-installed jumper from
between boiler terminals 3 and 4.
Ensure that the current capacities of wires,
switches, etc., at 120 VAC meet the ratings as
indicated in Table 5.
Equivalent
Mighty Venter Full Load Currents
Model Motor HP (Amperes - 120VAC)
MV2 1/8 4.4
MV3 1/4 5.8
MV4 1/3 7.2
MV5 1 16
Table 5. Electrical Ratings.