First Co EVBQ (Variable Speed) - Manual (Page 9)

Piping Connections to Water Heater
Solder Connections - All copper joints in the water lines must be made with low temperature - non lead solder.
“T” Connections (at the water heater) - Water lines to and from the fan coil unit must be taken from the horizontal connection
of the “T” fittings in the vertical hot and cold water supply lines at the water heater. This ensures that any air in the system will
be purged each time water is used in the dwelling. Failure to do so will cause a system malfunction.
Isolation Valves - Two valves are required to be installed within the circulating loop to permit servicing of the system if required
and to assist in purging the system. (See figure 4.)
PROCEDURE 7 – CONDENSATE DRAIN
Units are equipped with primary and secondary ¾ in. MPT drain connections. For proper condensate line installation see
figure 2. To prevent property damage and achieve optimum drainage performance, both primary and secondary drain lines
should be installed and include properly-sized condensate traps. (See figure 5 and 7.) Since the drain pan is located on the
suction side of the blower, a negative pressure exists at the drain pan and a minimum trap of 1-1/2 inches must be provided
in the drain line to assure proper drainage.
CAUTION: Shallow running traps are inadequate and DO NOT allow proper condensate drainage. (See
figure 6.) Failure to follow this CAUTION could result in product and property damage.
NOTE: If a Condensate Overflow Shut-off Switch, that is designed to be installed in the drain line, is used in place of a
secondary drain line, then the cut-off switch should be located in the primary drain line between the fan coil unit and the P-trap.
NOTE: When connecting condensate drain lines avoid blocking filter access panel. Prime both primary and secondary
condensate traps after connecting to drain pan.
NOTE: If unit is located in or above a living space where damage may result from condensate overflow, a field-supplied
external condensate pan should be installed underneath the entire unit, and a secondary condensate line (with appropriate
trap) should be run from the unit into the pan. Any condensate in this external condensate pan should be drained to a
noticeable place. As an alternative to using an external condensate pan, some localities may allow the use of a separate ¾
in. condensate line (with appropriate trap) to a place where the condensate will be noticeable. The owner of the structure
must be informed that when condensate flows from the secondary drain or external condensate pan, the unit requires
servicing, or water damage will occur.
Install traps in the condensate lines as close to the coil as possible. Make sure that the outlet of each trap is below its
connection to the condensate pan to prevent condensate from overflowing the drain pan. Prime all traps, test for leaks, and
insulate traps if located above a living area.
Condensate drain lines should be pitched downward at a minimum of 1 in. for every 10 ft. of length. Consult local codes for
additional restrictions or precautions.
PROCEDURE 8 – AIR FILTER
The air filter should be cleaned or replaced every 30 days or more frequently if severe conditions exist. Always replace the filter
with the same type as originally furnished.
CAUTION: Never operate unit without a filter or with filter access door removed. Damage to blower motor
or coil can result. Failure to follow this CAUTION could result in personal injury or product and property
damage.
IMPORTANT: Factory authorized filters must be used when locating the filter inside the unit. For those applications where
access to an internal filter is impractical, a field-supplied filter must be installed in the return duct system.
PROCEDURE 9 – UNIT START-UP
Refer to outdoor unit Installation Instructions for system start-up instructions and refrigerant charging method details.
Pre-start Check
Check that supply voltage matches nameplate data.
Ensure that the unit is properly grounded.
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