Mueller Model D Fre-Heater Installation and Operation Manual
Effective March 1, 1993
Part No. 8800430
Revised November 6, 2019
5.12 LABEL NO. 8801408, ATTENTION: WATER CONNECTIONS AND RELIEF VALVE
5.13 LABEL NO. 31246, MUELLER NAME PLATE
5.14
LABEL NO. 8823999, ATTENTION: CONTROL CIRCUIT WIRING SPECIFICATIONS
5.15
LABEL NO. 8824716, HFC REFRIGERANT
26
ATTENTION
ATTENTION
Water Connections
DO NOT apply heat to these fittings when making sweat
connections to the heater. Sweat tubing to adapter before
fitting the adapter to heater fittings. It is imperative that
no heat be applied to these fittings because they contain a
non-metallic liner.
Relief Valve
The relief valve installation temperature and pressure
protective equipment is required by local codes, but not
less than a combination temperature and pressure relief
valve device certified as meeting the requirements in the
listing requirements for ANSI Z21.22, “Relief Valves For
Hot Water Supply Systems,” by a nationally recognized
testing laboratory that maintains periodic inspection of
the production of listed equipment or materials. The
relief valve shall be so oriented or provided with tubing
that any discharge can exit only within 6" of or at any
distance below the structural floor and will not contact
any live electrical part. Omission or improper installation
of the temperature and pressure relief valve voids the
manufacturer’s warranty and liability.
1909
8801408
Please refer to the wiring
diagram for control circuit
wiring specifications.
1705
8823999
ATTENTION
