Maximum Delta Temperature (Max ∆T); Maximum Slab Supply; Minimum Boiler Return; Pump Settings - heat-timer SMC Installation & Operation Manuals

MAXIMUM DELTA TEMPERATURE (MAX ∆T)
Adjustable from 10F°/-6C° to 50F°/28C°
Hold MENU Button: <Settings>/<System Settings>/Max Delta Temp
• The Max ΔT is designed to prevent too much heat from entering the
slab at one time which can cause slab damage. Max ΔT is supplied by
the slab design engineer.
• The SMC monitors the difference between the temperature of the
heating solution going out to the slab (Slab Supply) and the temperature
of the solution returning from the slab (Slab Return) . This is called the
Slab ΔT.
• If the SMC calculates that the Slab ΔT may exceed the Max ΔT, the
SMC will begin closing the slab motorized valve or decreasing the boiler
modulation to help prevent excess heat from entering the slab.

MAXIMUM SLAB SUPPLy

Adjustable from 110°F/43°C to 190°F/88°C
Hold MENU Button: <Settings>/<System Settings>/Max Slab Supply
• The Maximum Slab Supply temperature is the highest water
temperature the SMC will output to the slab. The setting should be
determined by the slab design engineer.
• The SMC will modulate the motorized valve to close or reduce the boiler
modulation if it calculates that the slab supply temperature might exceed
the Maximum Slab Supply.

MINIMUM BOILER RETURN

Available when Boiler Return Sensor is Installed and Motorized Valve is the
Control Mode
Off, and from 40°F/4°C to 140°F/60°C
Hold MENU Button: <Settings>/<System Settings>/Minimum Boiler Return
• The Minimum Boiler Return temperature is designed to help protect
the boiler from thermal shock that may shorten its service life. Boiler
thermal shock may occur when the cold return enters a hot boiler. The
Minimum Boiler Return temperature should be determined by the boiler
manufacturer.
• When the Boiler Return Sensor temperature falls below the Minimum
Boiler Return, the SMC will modulate the slab motorized valve close
until the Boiler Return Sensor reading increases above this setting.

PUMP SETTINGS

Hold MENU Button: <Settings>/<System Settings>/<Pump Settings>

RUN-ON

Adjustable from 0 to 60 minutes
Hold MENU Button: <Settings>/<System Settings>/<Pump Settings>/Run-On
• The Run-On is an adjustable extra time used to run the pump after the
boiler is turned off or after the motorized valve is fully closed. This extra
time helps transfer the remaining system energy into the slab.
SMC Installation and Operation Manual
-- MAX dELTA TEMP --
Default: 20F°/11C°
[
- MAX SLAB SUPPLY -
Default: 120°F/49°C
[
[
Default: 140°F/60°C
-- PUMP SETTINGS --
Default: 2 minutes
--- PUMP RUN-oN ----
[
20 F
▲ ▼
BACK SAVE
120 F
▲ ▼
BACK SAVE
MIN BoILER RETURN
140 F
▲ ▼
BACK SAVE
Run-on
Exercise
Antifreeze 5min
▲ ▼
BACK SELECT
2min
▲ ▼
BACK SAVE
]
]
]
2min
off
]
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