SAFETY
INSTRUCTIONS
This safety alert symbol will be used in this manual and on the
pump Safety Instruction decal to draw attention to safety related
instructions. When used, the safety alert symbol means AT-
TENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
FAILURE TO FOLLOW THE INSTRUCTIONS MAY RESULT IN
A SAFETY HAZARD.
APPLICATION
To increase the overall efficiency of a hot water recirculation
system, the TC-1 timer control kit and the AQS-
1
/
2
and AQS-
3
/
4
aquastat kits can be installed for use on any B&G NRF, NBF or
Series PL circulator. The TC-1 timer control is programmable
to turn the circulator ON and OFF automatically at preset
times. The aquastat kits switch the pump OFF at 120°F
(48.9°C) and ON at 100°F (37.8°C). The timer and aquastat kits
can be used in combination or they can be used separately.
This permits the user to have the pump circulate hot water
only during those times when high usage can be expected
throughout the day. When the aquastat kit and timer are used
together, the pump will only circulate water when the ON time
conditions are met and when the water temperature is low
enough to cause the aquastat to switch ON.
OPERATIONAL LIMITS
For use on B&G models NRF/NBF/Series PL, indoor use only
Power supply: 115-120 VAC, 60Hz, 1Ø
Minimum switch interval: 15 minutes
Run Modes: ON (continuous run), OFF (off at all times), TIMER
(run at programmed intervals)
Maximum switch current: 16 amps
Aquastat switch modes: OFF (open) at 120°F (48.9°C) and ON
(closed) at 100°F (37.8°C)
Aquastat type: Bimetal element, senses surface temperature
of outside diameter of pipe
Pipe Size: AQS-
1
/
2
clips onto
1
/
2
" copper pipe or
3
/
8
" steel pipe
(OD of pipe
5
/
8
")
AQS-
3
/
4
clips onto
3
/
4
" copper pipe or
1
/
2
" steel pipe
(OD of pipe
7
/
8
")
Mounting: May be installed to sense temperature at the suc-
tion or discharge pipe of the pump
NOTE! Aquastat operation is dependent on ambient eviron-
ment. In installations with excessive heat gain or loss in the
ambient may affect the on/off operating temperatures.
INSTALLER:
PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.
Bell & Gossett
Automatic Timer Kit
Model TC-1
Aquastat Models
AQS-
1
/
2
, AQS-
3
/
4
Pumps With Plug-In Cords
Installation, Operation & Service Instructions
Bell & Gossett
Instruction Manual P58749
REVISION B
