Lochinvar 100208411 Variable Speed Pump for FTXL Fire Tube Boiler Installation Manual
Below you will find brief information for pump Knight 400 - 801, pump FTXL 400 - 850, pump Crest 751 - 5000. These pumps are designed for use with Lochinvar boilers. The document will guide you through the installation and setup process, including wiring connections and setting the pump's setpoint. It also includes tables for determining the appropriate pump setpoint for different temperature rise applications. You will also find information specific to each boiler model, including the proper wiring configuration.
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98624665 DIR# 2000505834 Rev B
INSTALLATION INSTRUCTIONS
GRUNDFOS MAGNA 3 VARIABLE SPEED PUMP WITH LOCHINVAR BOILERS
FOR KNIGHT 400 - 801, FTXL 400 - 850 AND CREST 751- 5000
Installation and Setup Procedure
1. Refer to the installation manual provided by the pump manufacturer to install the pump. NOTE: The boiler
MUST be installed in the Primary / Secondary piping configuration. A system supply sensor MUST be installed in the Primary (building) loop. Refer to the installation and operation manual provided by the boiler manufacturer to ensure the proper system piping configuration.
4. Reference Tables 1A, 1B and 1C on this instruction sheet to determine the setpoint percentage of the pump.
5. Follow the procedure below to apply the pump setpoint: a) From the pump Home screen use the arrow keys to b) Select “OK” to go to the Setpoint screen.
2. Reference FIG. 1 to connect wiring to the boiler’s low voltage control board on the “Boiler Pump Out” terminal: c) Use the arrow keys to to assign a setpoint based on the information provided in FIG. 2, on page 3.
d) Select “OK” to save the setting.
a) Connect the (+) wire from the boiler to “In” connection on the pump 0-10V wiring terminal. b) Connect the (-) wire from the boiler to the ground terminal on the pump 0-10V wiring terminal.
e) Select the “Home” button to return to the Home
screen.
3. Connect line voltage by supplying it directly to the pump.
For Knight and FTXL Models: Wire the boiler pump dry contacts located on the boiler’s line voltage terminal directly to the Magna 3 start/stop connection.
6. The pump is pre-programmed for 0-10V operation, but the boiler will require set-up to control the variable speed pump. Follow the instructions for variable speed pump setup in the boiler installation manual.
For Crest Models: Wire a relay to the 115V boiler pump connections on the boiler’s line voltage terminal. Connect the relay to the Magna 3 start/stop connection.
This method of line voltage supply allows the pump screen to stay on even when the boiler is in Standby mode. For additional information always reference the “Wiring” section in the boiler Installation and Operation Manual.
Figure 1 Wiring Connections
DETAIL A
A
POWER CONNECTION
IMG00960
98624665
Model
400
501
601
701
801
GPM
37
46
55
65
74
TABLE 1A - KNIGHT XL TEMPERATURE RISE APPLICATIONS
20°F
Magna 3 Setpoint (%) GPM
25°F
Magna 3
40-80 92% 30 40-80
50-150
50-150
50-150
50-150
42%
79%
79%
100%
37
44
52
60
50-150
50-150
50-150
50-150
Setpoint (%)
75%
83%
67%
64%
69%
Model
400
500
600
725
850
GPM
38
48
57
69
81
TABLE 1B - FTXL TEMPERATURE RISE APPLICATIONS
20°F
Magna 3
40-80
40-80
40-80
40-80
50-150
Setpoint (%)
54%
68%
79%
88%
50%
GPM
32
38
46
55
30°F
Magna 3
N/A
40-80
40-80
40-80
40-80
Setpoint (%)
45%
53%
60%
70%
GPM
29
34
40
40°F
Magna 3
N/A
32-60
40-80
40-80
Setpoint (%)
64%
46%
53%
Model
751
1001
1251
1501
1751
GPM
72
96
120
144
168
2001
2500
3000
3500
4000
5000
192
230
277
323
248 *
310 *
*Based on 30°F Temperature Rise
TABLE 1C - CREST TEMPERATURE RISE APPLICATIONS
20°F 40°F
GPM Magna 3
50-150
50-150
50-150
50-150
80-100
80-100
80-100
80-100
100-120
80-100
100-120
Setpoint (%)
42%
60%
67%
78%
64%
70%
82%
97%
97%
87%
92%
GPM
48*
48
60
72
84
96
115
138
161
186
233
Magna 3
40-80
40-80
40-80
40-80
50-150
50-150
50-150
50-150
50-150
80-100
80-100
Setpoint %
60%
60%
75%
91%
48%
54%
57%
69%
81%
64%
79%
40
48
56
64
77
92
108
124
155
60°F
Magna 3
N/A
40-80
40-80
40-80
40-80
40-80
50-150
50-150
50-150
50-150
Setpoint %
50%
60%
70%
81%
96%
46%
59%
61%
77%
DIR# 2000505834 Rev B 2
98624665
Figure 2 Pump Setpoint Screens
SETPOINT
MENU
HOME
BUTTON
DIR# 2000505834 Rev B 3
98624665
DIR# 2000505834 Rev B 4
Revision Notes: Revision A (ECO C14573) initial release.
Revision B (ECO C14859) reflects the update of Table 1A, Table 1B and other text adjustments.
Revision C (ECO C15375) reflects the addition of FTX Models and Table 1C.
Revision D (ECO C17117) reflects the addition of the system sensor note on page
1, Step 1.
DIR# 2000505834 Rev A (CN# 500000615) creation of TLT DIR in SAP.
Rev B (CN # 500000827) reflects the addition of Crest 751 - 1251 models and update of Tables 1B and 1C.
07/15 - Printed in U.S.A.
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Key Features
- Variable speed operation
- 0-10V control
- Primary/secondary piping configuration
- System supply sensor
- Setpoint adjustment
- Wiring diagrams
- Temperature rise applications
- Boiler model-specific instructions
Frequently Answers and Questions
How do I determine the appropriate pump setpoint?
What is the proper wiring configuration for the pump?
How do I set the pump's setpoint?
What is the difference in wiring for Knight/FTXL and Crest models?
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