Company UCQB Series Installation Manual

TYPICAL PIPING SCHEMATIC
HOT WATER COIL
1
2
TEE FITTINGS
MUST BE
INSTALLED AS
SHOWN. REFER TO
INSTRUCTIONS
FOR DETAILS
HOT WATER
SUPPLY TO
HOUSE
TO
HEATING
LOOP
FAN COIL UNIT
AIR
BLEED
VALVE
HOT
WATER
HEATER
CHECK
VALVE
PUMP
FLOW
FLOW
WATER SUPPLY
TO HOT WATER
HEATER
1) ISOLATION VALVE: SUPPLY
2) ISOLATION VALVE: RETURN
Y LINE (FIELD SUPPLIED)
N LINE (FIELD SUPPLIED)
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Figure 4
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 se-
curing 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.
1) ISOLATION VALVE: SUPPLY LINE (FIELD INSTALLED)
2) ISOLATION VALVE: RETURN LINE (FIELD INSTALLED)
**MAINTENANCE UPDATES**
For a current copy of the
Maintenance Program log on
to www.firstco.com and
look under "Product Informa-
tion"
CL
GN
1
2
345
24VAC
Common
115VAC
Neutral
Chassis Ground
115VAC Line
Five Available Programmed
Speed taps, 24VAC, See
Wiring Diagram on Unit
BRUSHLESS DC MOTOR CONNECTIONS
IF SO EQUIPPED
SEE WIRING DIAGRAM