Getting Ready; Application; Design Procedure - Taco X Pump Block Instruction Sheet

Getting Ready

Ensure that the contents of this package are complete. If any of the contents are missing or damaged, please contact your local Taco
sales representative for assistance.
Contents should include the following:
• One X – Pump Block, preassembled
unit consists of the following parts:
- One Variable Speed Mixing Control (VSMC)
- One Green Enclosure
- Two Casings with Circulators Attached
- One Heat Exchanger
- One Power Cord (6 feet)

Application

The Taco X – Pump Block (XPB) is a complete mixing system with an attached heat exchanger for system isolation. Integral to the unit
is a variable speed heat source circulator, constant speed system circulator, heat exchanger, and the electronics to drive it all. With
only four piping connections needed, the XPB greatly reduces the time and space required for installation. The heat exchanger
provides complete isolation between fluid on the heat source side and the fluid on the system side. The XPB can be set up to operate
as an outdoor reset control, a setpoint control or a delta T limiting control, creating flexibility never seen before in a single unit.

Design Procedure

1. Verify BTU capacity of X-Pump Block using charts below.
BTU/H Capacity @ 10 degree Delta T Across System
X-Pump BTU Capacities*
Heat Source Temperature Range
System
Temp.
120/100 130/110 140/120 150/130 160/140 170/150 180/160
70/80 29,900 29,900 29,900 29,900 29,900 29,900 29,900
80/90 29,800 29,800 29,800 29,800 29,800 29,800 29,800
190/100 29,800 29,800 29,800 29,800 29,800 29,800 29,800
100/110 4,500 29,700 29,700 29,700 29,700 29,700 29,700
110/120 5,500 29,600 29,600 29,600 29,600 29,600
120/130 6,000 29,600 29,600 29,600 29,600
130/140
140/150
150/160
* Assuming 6 gpm Flow on Radiant Side of XPB
2. Using the pump curve located below, ensure that the System Pump of the X – Pump Block will provide adequate head and flow for
the system in which it is to be installed. If flow rate is unknown, then use Equation No. 1 below to determine required flow.
3. Using the pump curve located below, ensure that the Heat Source Pump of the X – Pump Block will provide adequate head and flow
for the system in which it is to be installed. If flow rate is unknown, then use Equation No. 1 below to determine required flow.
4. Use Equation No. 1 to verify flow rates. Example: 25000 BTU
radiant load with supply temperature of 100° and return
temperature of 90°.
EQUATION NO. 1:
Flow Rate (GPM) =
EXAMPLE:
25,000
= 5 GPM
500 (100 - 90)
6,500 29,500 29,500 29,500
7,000 29,400 29,400
7,500 29,300
BTU's
500 x delta T
• One Taco Outdoor Sensor
• Two Taco Strap-on Sensors
• One Instruction Sheet
BTU/H Capacity @ 20 degree Delta T Across System
X-Pump BTU Capacities*
Heat Source Temperature Range
System
Temp.
120/100 130/110 140/120 150/130 160/140 170/150 180/160
60/80 59,900 59,900 59,900 59,900 59,900 59,900 59,900
70/90 59,800 59,800 59,800 59,800 59,800 59,800 59,800
180/100 27,000 59,800 59,800 59,800 59,800 59,800 59,800
190/110 4,500 29,000 59,700 59,700 59,700 59,700 59,700
100/120 5,500 31,500 59,600 59,600 59,600 59,600
110/130
120/140
130/150
140/160
20
SYSTEM SIDE
1
18
2 HEAT SOURCE SIDE
16
14
12
10
8
6
4
2
0
0 2 4
3 of 16
6,000 33,500 59,600 59,600 59,600
6,500 35,500 59,500 59,500
7,000 37,600 59,400
PUMP CURVES
1
2
6 8
FLOW (gpm)
7,500 39,700
10 12