Robertshaw 110 Series Installation Data

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The Robertshaw® 110 Series Water Heater Thermostat Uni-Kit® is
designed for universal replacement applications. All models feature
a built-in, noncycling Energy Cut-Off (ECO) system to shut off all gas
to the heater in case of excessive water temperatures. All models
have a 5-1/2" sensing element and vary by inlet and outlet size, shank
length, high temperature stop, and regulator type and setting. Except
for R103RV models, all are available in domestic (160°F Hi-Stop) or
commercial (180°F Hi-Stop) versions.
110TS - Has regulator which is less precise than R110R.
R110R - The regulator has a balancing diaphragm in addition to the
main pressure regulator diaphragm.
R110RC - Same as R110R except the thermostat can be converted from
use with natural to L.P. gas or L.P. to natural gas.
R103R - Same as R110R except has low capacity (35,000 BTU) for use
on recreational vehicles.
THERMOSTAT IDENTIFICATION BY GAS COCK DIAL TYPE
THIS DEVICE SHOULD BE INSTALLED BY A QUALIFIED
TECHNICIAN WITH DUE REGARD FOR SAFETY AS IMPROPER
INSTALLATION COULD RESULT IN A HAZARDOUS CONDITION.
INSTALLATION INSTRUCTIONS
Turn off gas to equipment before servicing.
1. Shut off water supply to heater and all hot water outlets.
2. If changing from natural to L.P. or L.P. to natural gas, the burner and
pilot orifices must also be changed.
3. If replacing a model R110RC convertible thermostat, set the control
for the gas being used. As shown in the figure below, remove the
slotted cap on the gas cock dial. Insert a small screwdriver blade
into slotted plunger. Depress the plunger fully and rotate 90° to
"LP" or "NAT" as desired. Replace the slotted cap and tighten with
screwdriver. NOTE: Some O.E.M. models of the convertible 110 have
a pilot regulator, which must also be changed. The model offered by
Uni-Line does not have this regulator.
CAUTION
INSTALLATION DATA
GAS WATER HEATER
THERMOSTAT UnI-KIT
4. DO NOT remove the protective plastic sleeve from the copper
sensing tube. Apply a small amount of pipe thread compound to
the brass shank threads. Remove the defective thermostat and
install the new unit. DO NOT use a pipe wrench on the control body.
Recommended method to tighten the thermostat is to screw a short
(8''-10") piece of correctly sized pipe into the INLET boss and use
this pipe as a handle. Insertion of any other object can cause internal
damage resulting in a hazardous condition.
5. Prior to connecting piping to the thermostat, check inlet gas pressure
to make sure it does not exceed 1/2 psi (14" W.C.). High pressure can
damage the control causing a hazardous condition.
6. If it is not already installed, a drip leg (sediment trap) should be
added to the gas supply line to the control. (See figure below.)
All piping must comply with local codes and ordinances and with
National Fuel Gas Code (ANSI Z223.1/NFPA, No. 54).
110 SERIES
®