First Co HBQB (High Efficiency) - Manual (Page 4)

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.
5)The water heater thermostat should
be adjusted so that the water tempera-
ture 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.
CONTROL BOARD
FEATURES / FUNCTIONS
Heating Cycle Delay
On a call for heat the board will
energize the circulator 45 seconds
prior to energizing the fan coil blower.
Once the zone has satisfied, the
blower will continue to run 20 seconds
after the board has de-energized the
circulator.
Pump Timer
Energizes the circulator four times a
day for 30 seconds to increase circu-
lator bearing performance and purge
the coil circuit loop.
Blower Speed Option
Jumper set at factory for low speed
operation on heating. Can be field
adjusted to permit high speed fan op-
eration on heating.
Fan Delay (Cooling Cycle)
Board permits the fan coil blower to
operate 45 seconds after cooling cycle
termination.
Freeze Protector (Optional)
Board has connection for an optional
freeze protector sensor that is at-
tached to the hot water coil. If the
sensor detects a near freezing condi-
tion it would activate the circulator to
circulate hot water though the water
coil.
Heater Booster (Optional)
Board has connection for an optional
ambient sensor. Sensor would sense
ambient temperature and energize the
fan coil blower on high speed if the
ambient drops below it’s set point.
Priority Sensor (Optional)
Board has connection for an optional
priority sensor. Sensor would sense
domestic hot water draw and
de-energize the fan coil while a hot
water draw is occurring.
MAINTENANCE
Fan
The fan should be inspected and
cleaned, in conjunction with mainte-
nance of the motor and bearings. It is
important to keep the wheel clean in
order to avoid imbalance and vibration.
Motor
Check motor connections to ensure
that they are secure and made in
accordance with the wiring diagram.
The blower motor should be cleaned
annually and if it has oiling ports, it
should be oiled with a good grade of
SAE 20 oil. Normally a few drops of oil
in each bearing is sufficient.
Coil
The coils must be kept clean, any
dust or other contaminants which ac-
cumulate on the heat transfer surfaces
interferes with the air flow and impairs
heat transfer. Inspect annually or
more frequently if required.
Filter
The air filter should be cleaned or
replaced every 30 days or more fre-
quently if severe conditions exist. Al-
ways replace the filter with the same
type as originally furnished.
Drain Piping
The drain should always be:
• Connected or piped to an accept-
able disposal point sloped away
from the unit at least 1/8" per foot
• Checked before summer operation
• Periodically checked during sum-
mer operation
Preventative Maintenance
To achieve maximum performance
and service life of each piece of equip-
ment a formal schedule of regular
maintenance should be established
and maintained.
PUMP REPLACEMENT
Disconnect electrical power before
servicing the unit.
To replace the circulator pump,
close the isolation valves and relieve
the water pressure within the heating
loop. Disconnect the pump's 115 volt
power lines within the control box and
remove the four hex head screws se-
curing the pump motor to the pump's
volute.
Reverse the above steps for reas-
sembling the pump, however make
sure that the pump or volute has the
rubber o-ring in place before assem-
bling.
CHECK VALVE
REPLACEMENT
Disconnect electrical power before
servicing the unit.
To replace the internal check valve,
close the isolation valves and relieve
the water pressure within the heating
loop. Remove the four hex head
screws securing the pump motor to
the pump's volute and remove. The
check valve is located in the volute.
Rotate the check valve to release and
remove from the volute.
Reverse the above steps for rein-
stalling a check valve, however make
sure that the pump or volute has the
rubber o-ring in place before assem-
bling.
**MAINTENANCE UPDATES**
For a current copy of the
Maintenance Program log on
to www.firstco.com and
look under "Product Informa-
tion"