ITT Bell & Gossett Aquastat Series, Bell & Gossett AQS-1/2, Bell & Gossett TC-1, Bell & Gossett AQS-3/4 Installation, Operation & Service Instructions

Bell & Gossett

Instruction Manual P58749

Bell & Gossett
Automatic Timer Kit Model TC-1

REVISION B

Aquastat Models AQS-

1

/2, AQS-3/4

Pumps With Plug-In Cords

Installation, Operation & Service Instructions

INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.

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 AT­TENTION! 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 AQS­aquastat 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.

1

/2 and AQS-3/4

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

1

Pipe Size: AQS-

Mounting: May be installed to sense temperature at the suc­tion or discharge pipe of the pump

NOTE! Aquastat operation is dependent on ambient eviron­ment. In installations with excessive heat gain or loss in the
ambient may affect the on/off operating temperatures.

/2 clips onto 1/2" copper pipe or 3/8" steel pipe

(OD of pipe
AQS-

(OD of pipe

5

/8")

3

/4 clips onto 3/4" copper pipe or 1/2" steel pipe

7

/8")

TIMER INSTALLATION

1. Disconnect the electrical supply to the pump.

WARNING: ELECTRICAL SHOCK HAZARD

Disconnect and lock out the power before making
electrical connections. Failure to follow these instructions
could result in serious personal injury or death.

2. Remove the screw that holds the steel conduit box cover
to the pump.

3. Remove the conduit box cover. The timer assembly replaces
the conduit box cover.

4. Disconnect the black and white motor leads from the power
supply.

5. Position the plastic base for the timer assembly onto the
steel conduit box with the warning/caution label to the rear
of the pump.

6. Secure the plastic timer base to the conduit box with one
8-32 screw provided.

7. Verify that the electrical rating of the timer matches the
values shown on the nameplate of the circulator.

8. Make the electrical connections according to the wiring
diagram provided. (See Figure 2)

. Position the cover/timer assembly over the base while

9

insuring that all wires are inside the box. Note that the
cover/timer assembly can only be assembled in one direc­tion on the base. Line up the screw holes in the cover with
the screw holes in the base.

10. Fasten the cover to the base using (2) 8-32 screws provided.

AQUASTAT INSTALLATION

1. Follow steps 1 and 2 in the timer installation section.

2. Remove the conduit box cover. If the aquastat is installed
without the timer, the steel cover is reassembled on the

ump after the aquastat installation is complete.

p

3. Fasten the aquastat clip to the discharge or suction pipe of
the pump.

4. Make the electrical connections according to the wiring
diagram provided. (See Figure 1)

WARNING: ELECTRICAL SHOCK HAZARD

Electrical connections are to be made by a qualified
electrician in accordance with all applicable codes, ordi­nances and good practices. Failure to follow these instruc­tions could result in serious personal injury, death and/or
property damage.

WARNING: ELECTRICAL SHOCK HAZARD

Electrical connections are to be made by a qualified
electrician in accordance with all applicable codes, ordi­nances and good practices. Failure to follow these instruc­tions could result in serious personal injury, death and/or
property damage.

CAPACITOR

N

WHITE

L

BLACK

WHITE

BLACK

AQUASTAT

5. Reassemble the conduit box cover to the conduit box while
insuring that all wires are inside the box. Reinstall the 8-32
screw to secure the cover to the conduit box.

CAPACITOR

BLACK

TIMER

54 3 2 1

WHITE

BLACK

WHITE

WHITE

BLACK

L

FIGURE 2

FIGURE 1

2

AQUASTAT AND TIMER INSTALLATION

1. Follow the installation steps in both sections and see
Figure 3 for wiring connections.

TIMER PROGRAMMING

1. Adjust the programming ring on the unit by turning it in the
direction of the rotation arrow until the timing arrow points
to the actual time of day. (This can also be accomplished
by rotating the minute hand on the real time clock, (shown
in figure 5) clockwise, until both the real time clock and the

iming arrow indicate the actual time of day.)

t

2. Restore power to the circulator and set the switch on the
timer dial to the “I” (ON) position.

. Program the “ON/OFF” times by pushing the programming

3

tabs toward the center of the dial for “OFF” operation and
toward the outside of the programming ring for “ON” time
periods. A pencil, pen or similar object may be used in
making adjustments to the programming tabs.

4. Set the manual switch to the “TIMER” position, which is
centered between the “I” and “O” on the timer dial, in
order to cycle the pump according to the programming tab
settings. The pump will run continuously when the switch
is set to the “I” (ON) position. The “O” (OFF) position of the
switch will shut the circulator off at all times.

5. In the event of a power outage, the timer must be adjusted
for the correct time of day after power is restored.

FIGURE 4

FIGURE 3

TIMER

54 3 2 1

HITE

W

BLACK

WHITE

BLACK

N
L

W

HITE

B

LACK

CAPACITOR

AQUASTAT

FIGURE 5

PROGRAMMING
RING

TIMING ARROW

ON, OFF, AUTO SWITCH

PROGRAMMING
TABS

REAL TIME
CLOCK

POWER
LEADS

SUPPLIED BY
OTHERS

3

PUMPS WITH FLEXIBLE CORD

1. Refer to instruction Manual P58671 or P48419 for installa­tion of the pump.

. If your pump is equipped with a flexible cord, insert the

2

115V plug into a properly grounded 115V outlet. (see
Figure 6)

WARNING: ELECTRICAL SHOCK HAZARD

This pump is supplied with a grounded conductor. To

educe the risk of electric shock, connect only to a properly

r
grounded, grounding-type receptacle. Failure to follow
these instructions could result in serious personal injury or
death.

© Copyright © 2009 ITT Corporation
Printed in U.S.A. 10-09

THE ITT ENGINEERED BLOCKS SYMBOL AND
ENGINEERED FOR LIFE ARE REGISTERED
TRADEMARKS OF ITT MANUFACTURING
ENTERPRISES, INC.

FIGURE 6

ITT

8200 N. Austin Avenue
Morton Grove, IL 60053
Phone: [phone]
Fax: [phone]
www.bellgossett.com