PRESTIGE Excellence
HX Field Replacement
Kit
7
Installation of New Heat Exchanger
Prior to installation of the new heat exchanger,
carefully check the interior of the boiler cabinet.
Dry the cabinet / insulation when signs of mois-
ture are present. Check integrity of all wiring.
Repair / replace when necessary.
1. Lift new heat exchanger into place by engaging
the rear HX brackets (top and bottom) into the
rear boiler jacket panel provisions.
Installation of Blower/Gas Valve/Venturi Assembly
1. Mount the blower/gas valve/venturi assembly
on top of the heat exchanger. Use the new
blower gasket provided in the kit. Install 4 new
blower mounting screws (M4 x 12) ensuring
they are properly tightened and the blower is
mounted securely to the burner plate (Fig. 9).
See Table 2, page 14 for torque specifications.
Installation of Water Connection
1. Connect boiler return piping back to return con-
nection of new heat exchanger. Use a new boiler
piping gasket provided in the kit between heat
exchanger and return pipe. Tighten the brass union
nut ensuring a leak tight seal.
2. Rotate the boiler supply piping back into position
and connect to the supply connection of the new
heat exchanger. Use a new boiler piping gasket
provided in the kit between heat exchanger and
supply pipe. Tighten the brass union nut ensuring
a leak tight seal.
Use care when tightening the heat exchanger union
nuts. If excessive torque is applied to the union nut,
damage can occur to the boiler piping or the gasket
seal resulting in leakage.
3. Install the internal circulator and diverter valve
assembly in the boiler using a new flange gasket
between the circulator flange and boiler piping
flange. Tighten the flange nuts and bolts to secure
the flange connection. Ensure the flange gasket is
not pinched between the flanges.
4. Connect the CH supply pipe to the bottom of the
diverter valve by tightening the brass union nut by
hand.
5. Install the DHW tank boiler piping using a new
boiler piping gasket provided in the kit between the
piping and the DHW tank. Tighten the brass union
on the boiler piping at the top of the DHW tank by
hand. Tighten the brass union nut at the diverter
valve by hand.
6. After all piping is connected, tighten all connec-
tions using the two wrench method.
7. Connect the Molex plug to the diverter valve
actuator and the electrical wiring to the internal
circulator.
NOTICE
NOTICE
2
4
3
1
1. Gas Valve
2. Venturi
3. “Straight” Gas Valve Fitting
4. Blower
Fig. 9: Prestige Burner Assembly
