Installation Manual Essentials 120213
13
Recommended Optional Control Terminations
IMPORTANT:
APPROPRIATE LIMIT DEVICES SHOULD BE INSTALLED FOR ALL SYSTEMS SO THAT OUTDOOR AIR IS NOT
INTRODUCED DURING UNDESIREABLE OUTDOOR CONDITIONS. CAN BE USED FOR HIGH OR LOW TEMP, DEW POINT,
HUMIDITY, CO2, CO OR ANY OTHER LIMITING INPUT DEVICE. DEVICE WILL DEPEND ON INSTALL LOCATION CLIMATE.
24VAC POWER FOR AUXILIARY DEVICES CAN BE TAKEN FROM THE LOGIC BOX "PWR OUT". NOT SHOWN CONNECTED
ON DRAWING FOR CLARITY. MULTIPLE LIMITING DEVICES SHOULD BE INSTALLED IN SERIES.
TOTAL TRANSFORMER CAPACITY IS 50VA. LOGIC BOX + TRANSFORMER TYPICALLY CONSUME LESS THAN 20VA.
DEVICES USING "PWR OUT" CANNOT EXCEED 50VA TOTAL TRANSFORMER CAPACITY.
EXTERNAL DEVICES PROVIDING A POWERED SIGNAL TO THE LOGIC BOX REQUIRE AN ISOLATION RELAY.
OUTDOOR LIMIT
DEVICE
(NORMALLY CLOSED - DRY CONTACT)
72
INDOOR LOW LIMIT
(ADDITIONAL, TYPICAL THERMOSTAT, (NOT PROVIDED) -
NOT THE EXISTING FURNACE THERMOSTAT)
SOME STAT MODELS
WILL NOT REQUIRE 'C'
THE INDOOR LOW LIMIT
OPTION
ALLOWS OWNERS TO USE ONE SETPOINT FOR
MORE EXPENSIVE COMPRESSOR BASED COOLING, WHILE HAVING A COOLER
SETTING FOR LOWER COST VENTILATION COOLING WHEN AVAILABLE.
VISIT FAMCOIAQ.COM/MANUALS FOR ADDITIONAL CONTROL OPTIONS
R
Y
R
C
RELAY -
24 VAC COIL
MECHANICAL STATS
DO NOT REQUIRE
RELAY. SWITCH T2
JUMPER
FIGURE 4
