Mueller Model D Fre-Heater Installation and Operation Manual
Effective March 1, 1993
Part No. 8800430
Revised November 6, 2019
TABLE 1: MODEL “D” FRE-HEATER TECHNICAL SPECIFICATIONS
1
Units have one 4,500-watt electric element (“A” = 208–230/60/1 and “B” = 460/60/1).
2
Units have one 6,000 watt electric element (“A” = 208–230/60/1 and “B” = 460/60/1).
3
Aquastat included.
4
Ammonia only.
6
Refrigeration tonnage capacities are evaporator tons and not heat of rejection tons.
Conditions for the capacities are: 30°F evaporator, 110°F condensing temperature, and 50°F discharge gas superheat.
Pressure drop through the Fre-Heater refrigeration circuit will be approximately 15 psi at the maximum tonnage application.
Pressure drop at the mid-range tonnage will be approximately 5 to 7 psi.
The highest percentage of heat recovered per ton is usually obtained at or below the mid range of the refrigeration tonnage capacity.
2
Model No.
Mueller
Part No.
No. of
Refrig.
Circuits
Refrigeration
Connection
Size
Per
Circuit
Refrig.
Capacity
5
Water
Connection
Size
Height Diameter
Water
Tank
Capacity
(gal)
Approx.
Shipping
Weight
(Lb)
Approx.
Loaded
Weight
(Lb)
D-50
8823750
1
5
∕
8
" ODM
.5 thru 4
3
∕
4
" FPT
54"
21
3
∕
4
''
50
225
600
D2-50
8823751
2
5
∕
8
" ODM
.5 thru 4
3
∕
4
" FPT
54"
21
3
∕
4
''
50
225
600
D-80
8823780
2
3
∕
4
" ODM
1 thru 5
3
∕
4
" FPT
59"
25
1
∕
4
''
80
300
940
D-120
8823821
2
3
∕
4
" ODM
1 thru 7.5
1
1
∕
2
" FPT
62"
29
1
∕
2
''
119
430
1,300
D2-120
8823820
2
1
1
∕
8
" ODM
3 thru 15
1
1
∕
2
" FPT
62"
29
1
∕
2
''
119
430
1,300
D2-120A
3
8823817
2
1
1
∕
8
" ODM
3 thru 15
1
1
∕
2
" FPT
62"
29
1
∕
2
''
119
430
1,300
DE-120
1
8823822
2
1
1
∕
8
" ODM
3 thru 15
1
1
∕
2
" FPT
62"
29
1
∕
2
''
119
430
1,300
DH-120
3
8823823
2
1
5
∕
8
" ODM
7 thru 35
1
1
∕
2
" FPT
62"
29
1
∕
2
''
119
440
1,300
DHS-120
8825141
1
1
5
∕
8
" ODM
14 thru 70
1
1
∕
4
" FPT
62"
29
1
∕
2
''
119
440
1,300
DHSE-120A4
1
8825142
1
1
5
∕
8
" ODM
14 thru 70
1
1
∕
4
" FPT
62"
29
1
∕
2
''
119
440
1,300
DHSE-120B4
1
8825143
1
1
5
∕
8
" ODM
14 thru 70
1
1
∕
4
" FPT
62"
29
1
∕
2
''
119
440
1,300
DHSE-120A6
2
8825213
1
1
5
∕
8
" ODM
14 thru 70
1
1
∕
4
" FPT
62"
29
1
∕
2
''
119
440
1,300
DHSE-120B6
2
8825214
1
1
5
∕
8
" ODM
14 thru 70
1
1
∕
4
" FPT
62"
29
1
∕
2
''
119
440
1,300
DA-120
4
8823826
2
1" MPT
5 thru 25
1
1
∕
2
" FPT
62"
29
1
∕
2
''
119
440
1,300