Mueller Model D Fre-Heater Installation and Operation Manual Eective March 1, 1993
Part No. 8800430 Revised November 6, 2019
FIGURE 4: FRE-HEATER TOP HEAD LAYOUT: WATER CONNECTIONS,
ANODE LOCATIONS, AND REFRIGERANT PIPING
5
50-GALLON
MODEL “D” FRE-HEATER
.75"
P/T
Anode
Plug
R1-Out
R1-In
.75" FPT
Cold In
.75" FPT
W/ Plug
.75" FPT
Hot Out
50-GALLON
MODEL “D2” FRE-HEATER
R2-Out
R2-In
.75"
P/T
Anode
Plug
R1-Out
R1-In
.75" FPT
Cold In
.75" FPT
W/ Plug
.75" FPT
Hot Out
80-GALLON
MODEL “D” FRE-HEATER
R2-Out
R2-In
.75"
P/T
Anode
Plug
R1-Out
R1-In
.75" FPT
Cold In
.75" FPT
W/ Plug
.75" FPT
Hot Out
120-GALLON
MODEL “D” FRE-HEATER
R2-Out
R2-In
.75"
P/T
Anode
Plug
R1-Out
R1-In
1.5" FPT
Cold In
.75" FPT
W/ Plug
1.5" FPT
Hot Out
.75" FPT
W/ Plug
Anode
Plug
120-GALLON
MODEL “D2” AND “DE” FRE-HEATER
120-GALLON
MODEL “DH” FRE-HEATER
R2-Out
R2-In
.75"
P/T
Anode
Plug
R1-Out
R1-In
Cold In
.75" FPT
W/ Plug
1.5" FPT
Hot Out
.75" FPT
W/ Plug
Anode
Plug
120-GALLON
MODEL “DHS” AND “DHSE” FRE-HEATER
.75"
P/T
Anode
Plug
R1-Out
R1-In
1.25" MPT
Cold In
.75" FPT
W/ Plug
1.25" FPT
Hot Out
.75" FPT
W/ Plug
Anode
Plug
75" MPT
Water
Equalization
Port
R2-Out
R2-In
.75"
P/T
Anode
Plug
R1-Out
R1-In
1.5" FPT
Cold In
.75" FPT
W/ Plug
1.5" FPT
Hot Out
.75" FPT
W/ Plug
Anode
Plug
.75" FPT Water Connections
.625" ODM Refrigeration Connections
.75" FPT Water Connections
.625" ODM Refrigeration Connections
.75" FPT Water Connections
.75" ODM Refrigeration Connections
1.5" FPT Water Connections
.75" ODM Refrigeration Connections
1.5" FPT Water Connections
1.125" ODM Refrigeration Connections
1.5" FPT Water Connections
1.625" ODM Refrigeration Connections
1.25" FPT Water Connections
1.625" ODM Refrigeration Connections
120-GALLON
MODEL “DA” FRE-HEATER
1.5" FPT Water Connections
1" MPT Refrigeration Connections
R2-Out
R2-In
.75"
P/T
Anode
Plug
R1-Out
R1-In
1.5" FPT
Cold In
.75" FPT
W/ Plug
1.5" FPT
Hot Out
.75" FPT
W/ Plug
Anode
Plug
Electrical
Components
Model “DE” Only
Electrical
Components
Model “DE” Only
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