First Co EVBQ (Variable Speed) - Manual (Page 10)

With power off, check blower wheel set screw for tightness and ensure that the blower wheel rotates freely and quietly.
NOTE: Remove the motor blower shipping brace on the 48EVBQ blower assembly. Failure to do so will cause damage to the
unit.
Check that the water coil, valves and piping have been leak checked and insulated as required.
Ensure that all air has been vented from the hot water coil.
NOTE: It may require purging several gallons of water so have a means of discarding the water.
Install all panels.
NOTE: The blower door must be in place for the unit to operate due to the door safety switch.
Install any filters which may have been removed during the installation process.
Before start-up, all of the components should be given a thorough check. Optimal operation of this equipment requires
cleanliness. Often after installation of this equipment additional construction activities occur. Care must be taken to protect the
equipment from debris during these construction phases.
Heating Cycle Start-up
WARNING: Hot water can cause scalding. A hot water mixing valve can be applied to the system to temper
domestic water draw. Failure to follow this WARNING could result in personal injury or product and property
damage.
Closed Loop System
Check that the water coil, valves and piping have been leak checked.
Purge the air handler’s hot water coil and water lines of all air.
Energize circulator pump to check if hot water is circulating through the coil.
Domestic Hot Water System
Fill the water heater. Open a hot water faucet while filling the water heater to vent the air. When the tank is full and all the air
is purged, close the faucet.
Ignite the water heater and set the thermostat to 140 degrees.
Purge the air handler’s hot water coil and lines. Close valve number 2 and open valve number 3. (See figure 4 pg. 7.)
Next, open
the air bleed valve. When all of the air is purged from the lines close valve number 3 and open valve number 2. After all the air
is purged from the coil and lines, open both valve number 2 and 3 and close the air bleed valve.
NOTE: Purging the system may require several gallons of water, so have a means of discarding the water.
Switch the room thermostat to the “Heat” position and raise the temperature setting to a position approximately ten degrees
above room temperature.
NOTE: The door switch must be activated to operate the unit.
The pump should energize and begin circulating the hot water through the coil. If the pump is operating properly and the
water temperature in the water heater has reached the set point, then the hot water inlet at the fan coil unit will be hot. If the
pump is running but hot water is not circulating, open the air bleed valve long enough to purge any remaining air from the
hot water lines and coil. This will allow the pump to begin circulating hot water.
The water heater thermostat should be adjusted so that the water temperature entering the hot water coil is as close to 140
degrees as possible with the system energized and operating long enough for all temperatures to stabilize.
CAUTION: The fan coil unit should not be energized for heating until the hot water coil and all water lines
have been purged of air. Failure to follow this CAUTION could result in product and property damage.
APPLICATION AND BLOWER SPEED SELECTION
Select taps are used by the installer to properly configure the system. The ECM motor uses the selected taps to modify its
operation to a pre-programmed table of airflows. (See Table 1. ) Airflows are based on the system size or mode of operation
and those airflows are modified in response to other inputs such as the need for dehumidification. The unit will deliver a
constant airflow, based on the table of airflows and select taps, with a system static pressure up to 0.5 in H2O.
NOTE: The variable speed unit is compatible with damper duct systems when designed properly. Consult the damper
system manufacturer for proper design.
NOTE: The unit may appear to ‘pulse’ with system static pressures greater than 0.5 in H2O.
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