Mueller Model D Fre-Heater Installation and Operation Manual Eective March 1, 1993
Part No. 8800430 Revised November 6, 2019
2.1 INSPECTION
Each shipment should be carefully checked for shortages or concealed damage. Any shortage or damage must be
reported to the delivery carrier at the time of delivery.
Damaged material becomes the delivery carrier’s responsibility and should not be returned to the manufacturer
unless prior approval is obtained.
2.2 FRE-HEATER LOCATION
Mueller Model “D” Fre-Heaters should be located indoors. If necessary to locate the Fre-Heater outside, it must be
under a cover and protected from water dripping, spraying, or in any way collecting on the top surface, as this can
result in the failure of the heat exchanger.
When selecting a location for a Model “D” Fre-Heater, the ability of that location to bear the loaded weight of the
Fre-Heater should be a prime consideration. The loaded weights of all Model “D” Fre-Heaters are listed in Table 1.
Model “D” Fre-Heaters must be protected from freezing. Particular attention should be directed to protecting the
water piping going to and from the Fre-Heater.
The Model “D” Fre-Heater should be located as near as practical to the condensing unit(s). The Fre-Heater should
not be located where cooling tower or evaporative condenser water will be in continual direct contact with the
exterior surface. Careful planning of the Fre-Heater location and plumbing can reduce installation costs and save
time during installation and on maintenance in the future.
See Figures 1, 2, 3, and 4 for dimensions. Provide adequate space between walls and the Fre-Heater for convenient
access to all piping connections. See suggested refrigerant piping diagrams shown in Figures 10, 11, and 12.
2.3 LEVELING
Three large cap screws are provided with the Model “D” Fre-Heater to raise it above the floor and level it. The cap
screws should be screwed out enough to raise the tank slightly before setting it in place and then adjusted as needed
to level the unit. The legs provided will allow the Fre-Heater to be raised approximately 1". Should more height be
needed, a leg kit (Mueller Part No. 8801890) is available to raise the Fre-Heater approximately 5
1
⁄2" off the floor.
3
Section 2.0 – Installation
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