Robertshaw 120 Series Installation Data

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The Robertshaw® 120 Series gas heating controls are designed for a
variety of heating applications. Models are available with hydraulic
or 24 volt operators. Each control has positive snap-action, automatic
pilot safety valve, pilot adjustment key, pilot filter and pilot outlet.
Pressure regulation is optional by model.
24 volt models are thermostatically controlled by a remote electric wall
thermostat. Hydraulic models are self-contained and require no outside
control.
THIS DEVICE SHOULD BE INSTALLED BY A QUALIFIED SERVICE
TECHNICIAN WITH DUE REGARD FOR SAFETY AS IMPROPER
INSTALLATION COULD RESULT IN A HAZARDOUS CONDITION.
SPECIFICATIONS - HYDRAULIC
PART FACTORY MODEL
NUMBER
120-201 110S
120-202 110SR
120-203 110SS
120-204 110S
* Includes separate regulator. Select 4.0" W.C. for natural gas or 10.0" W.C. L.P. gas.
24 VOLT (Electrical rating: 24V AC, .62 Amps)
PART NUMBER FACTORY MODEL PIPE SIZE INLET/OUTLET PRESSURE REGULATOR SETTING
120-402
120-407
120-472† 110ERCHCSO-2E
120-473† 110ERCHCSO-2D
120-474† 110ERCHCS)-2C
† Has step opening feature.
**Has gas converter feature for mobile home use only. Select 3.5" W.C. natural gas or 11.0" W.C. LP. gas.
INSTALLATION INSTRUCTIONS
Turn off gas to equipment before servicing.
1. Remove defective control.
1-185C.indd 1
CAUTION
APPLICATION TEMPERATURE
RANGE
SPACE HEATING 58-90°F
SPACE HEATING 58-90°F
STOCK TANK 36-68°F
BROODER / SPA 78-110°F
110ER 1/2" x 3/8"
110ERCHC 1/2" x 1/2"
1/2" x 3/8"
1/2" x 3/8"
1/2" x 3/8"
INSTALLATION DATA
GAS HEATING CONTROLS
CAPILLARY LENGTH PIPE SIZE
INLET/OUTLET
36" 1/2" x 3/8"
36" 1/2" x 3/8"
36" 1/ 2" x 3/8"
36" 1/ 2" x 3/8"
CAPACITY
3.5" W.C. 75,000
**
100,000
**
79,930
**
79,930
**
79,930
2. If installing a thermostat with the gas converter feature, set control
for the type gas being used. NOTE: If changing from natural to
L.P. gas or L.P. to natural gas, pilot and burner orifices must also be
changed.
FOR NATURAL GAS OPERATION: Install the aluminum colored cap
in the threaded hole in the regulator cover (see figure at left).
NOTE: With no cap installed in the regulator cover, the regulator
will provide natural gas regulation; however, it is imperative that
the aluminum cap be used to provide proper venting and damping.
FOR L.P. GAS OPERATION: Install the red colored cap in the
threaded hole in the regulator cover (see figure at left).
Outlet pressure can be adjusted to the exact setting specified by
the manufacturer of the appliance by using the regulator
adjustment screw (see figure at left). To provide a means of storing
the unused cap, a blank threaded mounting hole is provided at the
bottom of the center casting (see figure at left).
120 SERIES
PRESSURE CAPACITY
REGULATOR SETTING
NONE 85,170
*
85,170
NONE 85,170
NONE 85,170
ALL MODELS
Pressure Tap - 1/8 NPT
Pilot Outlet - 1/4 Tubing
Maximum Ambient Temperature - 175°F
3/18/15 11:58 AM