Honeywell SV2 Series Installation Instructions page 3

• Turn off gas supply before starting installation.
• Disconnect power supplies before beginning installation.
• More than one disconnect can be involved.
The heat exchanger can be directly mounted to the V2MU
mixing unit as shown in Fig. 3-Fig. 4 and can be mounted
in either a vertical or horizontal position, depending on the
appliance configuration and available space.
For remote mounting the heat exchanger, the customer must
provide the appropriate bracket and/or install and connect as
part of their appliance offering. Pulse line tubing and fitting
between the mixer and heat exchanger is then required.
The inner diameter of the connection between the heat
exchanger and the mixer shall not be smaller than 9mm at
any point.
NOTE: The Heat Exchanger must always be mounted in
a position that allows condensate to drain to the
mixing unit. Accordingly, ensure that the mixer
connection on the heat exchanger is the lowest
point in regards to the heat exchanger mounting,
otherwise water will be trapped inside the heat
exchanger and will not drain appropriately.
Fig. 3. Heat exchanger mounting example with horizontal
mixing unit orientation (shown with 300kW Mixing Unit).
Fig. 4. Heat exchanger mounting example with vertical
mixing unit orientation (shown with 300kW Mixing Unit)
IMPORTANT:
• The SV2 series premix valve and its accessories have
been developed to provide an optimum fuel-air ratio
performance.
• Honeywell cannot guarantee the valve or mixer
performance, operation, efficiency or reliability if any non-
Honeywell accessories are used with the SV2 Series premix
platform.
• When mounting the heat exchanger vertically, orient its
port C connection facing upwards so that the condensate
from the FARMOD drains through the heat exchanger and
into the mixing unit. Refer to
Excessive moisture can partially or fully clog the pulse lines
between the mixing unit and the FARMOD and damage the
FARMOD. In this case, the system will fail safely by causing
a flame out, a valve lockout and/or may render the FARMOD
unusable. Note that the FARMOD is field replaceable should
this last instance occur.
A. FARMOD Insulation Installation
1. Take care that dirt does not enter the gas valve or pulse
lines during handling.
2. Remove the original four (4) torx screws as shown in
Fig. 5 and completely remove the Fuel Air Ratio Module
from the valve body.
Fig. 5. FARMOD pulse line connections/mounting.
3. Place the FARMOD into the insulation shoe and thread
the long screws provided with the kit through the
combination. Refer to Fig. 6.
Fig. 6. FARMOD with insulation shoe.
3
SV2 SERIES VALVES PREMIX ACCESSORIES
Fig. 2-Fig. 4.
32-00180—01