48297 1 Taco Hec 2 Brochure User Manual

User Manual: Pump 48297 1 Taco Hec-2 Brochure

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Water Circulation
Pumps & Circulators

High-Efficiency Variable Speed Circulator
The Bumble Bee (model HEC-2) represents the very latest in variable speed wet rotor
circulator technology. Its high efficiency ECM motor uses up to 85% less electricity than
a standard circulator, and its out-of-the-box settings and 360˚ swivel flange makes it a
breeze to install. Most importantly, the Bumble Bee’s Delta-T variable speed technology
maximizes the overall efficiency of your heating system. The Bumble Bee is engineered
for energy savings, ease of installation, versatility in the field and ultimate comfort.

©Taco Catalog #100-101
Supersedes: New

Effective Date: 10/15/12
Printed in USA

Features & Operation

• High efficiency ECM Motor
• Reduces power consumption by up to 85%
• Fully Programmable
• Plug-in remote temperature
sensors included
• LED displays real-time mode,
watt usage and GPM flow
• 360˚ swivel flange
• Nut capture feature on flanges
• Integral Flow Check
(IFC®) included

360˚ Swivel Flange for universal fit-up

Operates in Three Modes
GPM

CP - Constant Power (Fixed Speed)
Allows for 4 fixed circulator speeds.
WATTS
GPM

SP - Setpoint (Variable Speed)
Allows for a fixed supply temperature from 65°F to 220°F.
WATTS
GPM

WATTS

dE - Delta-T, Differential Temperature (Variable Speed)
Allows for a fixed system temperature differential 		
(∆T) from 5°F to 50°F.
Factory Pre-Set for Delta-T mode @ 20˚F ∆T

Applications & Performance
Delta-T

Across a series loop
system using zone valves

M

M

Supply
Sensor

M

HEC-2

Return
Sensor

Outdoor
Sensor

Delta-T

Across multi-zone radiant
manifolds with loop actuators

M

M

M

M

Supply
Sensor
Return
Sensor

C
C

HEC-2

B
B

iSeries-R

A
A

Boiler
Sensor

Setpoint

Setpoint

Fan coil fixed temperature

Radiant injection mixing

Duct
Supply
Sensor

HEC-2

HEC-2

Supply
Sensor

Setpoint

Boiler protection by-pass
HEC-2

Supply
Sensor

Constant Power (Fixed Speed) Performance Curves
0.0
16

0.5

FLOW-M3/H
1.5
2.0

1.0

2.5

3.0

3.5

15

4.5

14
1
2

TOTAL HEAD - FEET

12

3

11

4

10

4.0

Speed 1
Speed 2
Speed 3
Speed 4

3.5

4

3.0

9
8

2.5

3

7

2.0

6

2

5

1.5

4

1

3

1.0

2

0.5

1
0

0

2

4

6

8

10

12

14

16

0.0

TOTAL HEAD - METERS

13

Submittal Data # 101-152
Supersedes: New

Submittal Data Information
Bumble Bee Circulator

Effective: 10/15/12

Description:

Specifications
• Max. Operating Pressure: 125 psi
(862 kPa)
• Min. Fluid Temp: 40°F (4ºC)
• Max. Fluid Temp: 230°F (110ºC)
• Max. Flow: 15 gpm
• Max. Shutoff Head: 15 feet
• Electrical Specifications:
- Voltage: 115-230, 50/60 Hz, single phase
		 - Operating power range: 9W - 42W
		 - Max. Amp rating: 0.67 / 0.39
• HEC-2 is provided with a cast
iron casing and should be used
in closed loop systems only.
• Acceptable for use with water
or maximum of 50% water/glycol
solution.

The Taco Bumble Bee (model HEC-2) is a multi-function, variable speed, wet
rotor circulator with an ECM, permanent magnet motor. Its high efficiency DC
motor reduces power consumption by up to 85% compared to AC permanent
split capacitor circulators.

Performance Data

Pump Dimensions & Weights

• Programmable PC board with
LED display and 3 operating modes:
			 CP – Constant Power 		
(Fixed Speed) Mode allows
for 4 fixed circulator speeds.
SP – Set Point Mode allows
for a fixed supply temperature,
65°F - 220°F.
dE – Delta-T Mode allows for
a fixed temperature differential
(ΔT) range from 5°F - 50°F.
• Can be wired to a Taco ZVC Zone
Valve Control or SR Switching
Relay for ON/OFF operation.
• Sensor kit includes one long
and one short sensor with
two tie wraps.
• Integral Flow Check (IFC®) is
included in carton. Simply press
into discharge flange if required.
• Swivel-flanged casing provides
360° rotation mounting flexibility.
• LED displays operating mode, flow
(GPM) and power usage (WATTS),
alternating every 5 seconds.

Materials of Construction:

Casing: ........................... Cast Iron
Integral Flow Check (IFC®):
Body, Plunger...... Acetal
O-ring Seal.......... EPDM
Spring................... Stainless Steel
Stator Housing:............ Aluminum
Cartridge:...................... Stainless Steel
Impeller:......................... Non-Metallic
Shaft:............................... Ceramic
Bearings:......................... Ceramic
O-Ring & Gaskets:....... EPDM
A

Model

in.

B
mm

HEC-2
180
7-1/8
Shipping
Weight

A

F

B

D

C
E

C

D

E

F

in.

mm

in.

mm

in.

mm

in.

mm

in.

mm

lbs.

Kg

5-3/4

145

3-1/4

81

2-5/16

58

6-5/16

161

4-7/16

112

7

3.2

Electrical Data
Model

Volts

Hz

HEC-2 115-230 50/60

Ph

Amps

RPM

HP

1

.67 / .39

1750-3800

1/20

Motor ECM, Permanent Magnet
Type

Speed 1
(Watts)

Speed 2
(Watts)

Speed 3
(Watts)

Speed 4
(Watts)

9

22

32

42

Mounting Positions

For Indoor use only

CONFORMS TO:
UL STD 778
CERTIFIED TO:
CAN/CSA STD C22.2
NO. 108

Ship Wt.

4001998

Taco Inc., 1160 Cranston Street. Cranston, RI 02920 / (401) 942-8000 / Fax (401) 942-2360
Taco (Canada) Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8 / (905) 564-9422 / Fax (905) 564-9436
www.taco-hvac.com



---

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