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3. Required Components And Acessories Checklist
MODEL
HM-41
HM-80
sized diaphragm expansion tank. Otherwise, significant
heat transfer problems can occur by causing air to be
trapped in the heat exchanger. If the boiler system has
an existing expansion tank and the boiler temperatures
are being changed, resize the existing diaphragm
expansion tank.
HYDROMAX
Components (Single Wall Shown)
®
Boiler Return
Cold Water
Inlet
Retaining Screws (2)
Heat Exchanger Pressure Loss
15
10
5
0
0
2
Flow (Gallons Per Minute)
CIRCULATOR
ZONE VALVE
PERFORMANCE
4 GPM @ 6 FT
3/4" Full Port
4 GPM @ 6 FT
3/4" Full Port
If a steel hydropneumatic tank is
in place, replace it with a properly
Boiler Supply
Hot Water
Outlet
Heat Trap
4
6
SHUTOFF
RELIEF VALVE
VALVES
4
4
exchanger plate. It is recommended that the front half
be removed prior to soldering to avoid potential damage.
Two-Piece Cover Removal and Installation
Removing Front Half:
Depress both tab buttons to
detach one side at a time.
Installing Front Half:
Align bottom groove of cover
onto metal retaining ring.
Beginning with one side,
align pin and push until both
tabs lock. Repeat for other
side, ensuring all tabs are
fully engaged.
Removing Entire Cover:
Remove front half, loosen
both retaining screws and
remove rear half.
8
-3-
THERMAL
EXPANSION
TANK
Included
2.0 Gallon
Included
4.4 Gallon
Use care when using a torch
near the top cover and heat
Tab Buttons (4)
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