3
TYPICAL ROBERTSHAW HOT SURFACE APPLICATION
PILOT TUBING
NOTE:
Some hot surface applications use the pilot outlet, if so proceed
as directed below. If not used install pilot outlet tubing plug packaged
in the 720-079 gas valve kit then proceed to “wiring”.
1. Make sure tubing is free of burrs and dirt.
2. We strongly recommend that the pilot orifice be checked and
cleaned if necessary at this time.
3. Connect pilot tubing into the control using fitting provided, and
tighten for a gas-tight seal.
WIRING
DO NOT
short gas valve terminals. This will damage wall thermostat
and void warranty.
1. Check the system for the proper transformer by comparing the VA
ratings of the transformer and the system. The system rating is deter
-
mined by
multiplying the voltage draw times the amp draw.
INSTALLATION INSTRUCTIONS – HOT SURFACE APPLICATIONS
Normally 20VA transformers are sufficient for heating only applica tions
and 40VA for heating /cooling applications.
NOTE:
Improper transformer VA rating will cause erratic system
operation.
2. Locate the white wire terminal adaptor (jumper) that is included
with the 720-079 gas valve.
3. Connect the white wire terminal adaptor to the “M” and “P” termi
-
nals on the 720-079 gas valve.
4. Determine which wire was connected to the “main valve” terminal
on the original valve. Connect this wire to the remaining terminal on
the white wire terminal adaptor.
