Thermostat And Limit Controls - Smith 8 SERIES Installation & Operating Instructions Manual

8 SERIES BOILER INSTALLATION AND OPERATING INSTRUCTIONS
WATER
BOILERS
WATER BOILER TRIM
The water trim furnished with the boiler consists of a
2-1/2" round temperature pressure gauge and a 30 psig
pressure relief valve. A circulator relay is furnished for
installation in the upper port cover plate or the tankless
heater cover plate as indicated in Figure No. 3. The
installer must furnish and install air removal devices,
expansion tank, automatic air vents, make-up water
pressure reducing valve, isolating valves and other pipe
fi ttings and equipment necessary for proper operating
system.
Figure 3
Pressure Relief Valve
Install safety relief valve (30 psi) in top 3/4" tapping of
back section.
WARNING: Never install any type of valve
between the pressure relief valve and the boiler!
Failure to comply with this warning can result in
a boiler explosion causing extensive property
damage, severe personal injury or death!
WARNING: The pressure relief valve discharge
piping must direct all water and vapor away from
personnel. Failure to comply with this warning
could result in severe personal injury!
Figure 4 – Relief Valve Installation
DISCHARGE PIPE SIZE
EQUAL TO VALVE OUTLET.
DO NOT RESTRICT FLOW.
FOR DISCHARGE
PIPING THROUGH
ROOF CONSULT
THE SMITH CO.
DISCHARGE SO
AS TO AVOID
EXPOSURE OF
PERSONS TO HOT
LIQUID OR VAPOR.
LEAVE OPEN END
VISIBLE FOR PERIODIC
INSPECTION FOR SLOW
LEAKAGE OR DRIPS.

THERMOSTAT AND LIMIT CONTROLS

Many jurisdictions require dual limit controls. The boiler
installer must arrange to comply with local requirements
by furnishing and installing any extra controls.
The water boiler is furnished with a Hydrolevel Hydrostat
hydronic relay, which provides high limit low limit and
circulator switching upon signal from a 24 volt thermostat
and LWCO functionality.
Page 5
SUPPORT DISCHARGE
PIPING SO AS TO AVOID
STRAIN ON VALVE BODY
RELIEF OR SAFETY VALVE.
DO NOT REMOVE RATING
OR WARNING TAGS