44
LP- 428 REV. 9.2.14
either the set point temperature or the heat output of the boiler. The control interprets the 0-10 volt signal as follows: When the signal is
greater than 1.5 volts, the boiler will ignite. As the signal continues to rise towards its maximum of 10 volts, the boiler will increase either
in set point temperature or firing rate depending on the setting of parameter 17 in the installer menu. See Part 10 for details on the
setting of parameters 16 and 17 for this option.
2. Connect a building management system or other auxiliary control signal to the terminals marked 0-10 VOLT + and 0-10 VOLT
– in
the electrical junction box (shown in Figure 27) of the bottom boiler. Caution should be used to ensure that the 0-10 VOLT + connection
does not become connected to ground.
J. OPTIONAL HIGH GAS PRESSURE SWITCH
1. If an optional high gas pressure switch is used, it should be installed on the outlet side of the gas valve of both boilers. This is
normally closed and will open if the pressure goes above 1.5” w.c. on the outlet side.
2. Locate the two pigtails hanging from the electrical box inside of the cabinet of the boiler with the installed switch. Remove and
discard the jumper plug from one of the unused pigtails.
3. Connect the high gas pressure switch to the pigtail that you removed the jumper plug from.
K. OPTIONAL LOW GAS PRESSURE SWITCH
1. If an optional low gas pressure switch is used, it should be installed on the inlet side of the gas valve of both boilers. This is normally
closed and will open if the pressure goes below 1” w.c. on the inlet side.
2. Locate the two pigtails hanging from the electrical box inside of the cabinet of the boiler with the installed switch. Remove and
discard the jumper plug from one of the unused pigtails.
3. Connect the low gas pressure switch to the pigtail that you removed the jumper plug from.
L. OPTIONAL FLOW SWITCH
NOTE:
Follow the more detailed instructions included with the flow switch kit for proper installation steps.
NOTE:
The boiler will need 2 flow switches to ensure there is enough flow through each heat exchanger of the boiler assembly.
1. Attach the correct flow paddle to the flow switch.
2. Thread brass tee onto outlet nipple using pipe dope.
Make certain the branch points up on horizontal runs.
3. Thread flow switch into tee using pipe dope.
Make
certain the FLOW arrow points in the correct direction
.
4. Disconnect red wire on the low water cut off probe and connect it to the red wire from the wire harness (included in kit).
5. Feed green ground wire into boiler through the wire access.
6. From the front of the boiler, feed the ground wire up into the control box.
7. Once into the control box, attach the green ground to the ground bus connection.
8. Connect red wire from flow switch to boiler wire harness.
9. When installation is complete, power up the boiler and use the control to access installer parameter #20 and change the default
value to 2 (see Part 11 in this manual). When done, create a demand and observe boiler function to verify the installation is working
properly.
NOTE:
Installing the optional flow switch will disable the built-in low water cutoff. If a flow switch and a low water cutoff are necessary
for the installation, purchase and install the optional UL353 LWCO (available from HTP, Part # 7350P-601). In this installation, it is
recommended to install the flow switch kit first.
M. OPTIONAL UL353 LOW WATER CUT-OFF INTERFACE KIT
NOTE
This boiler will require 2 interface kits to ensure both heat exchangers are full of water.
1. If an optional UL353 low water cut-off (LWCO) interface kit is used, the control box of the kit should be mounted to the left side of the
boiler cabinet near the low water cut-off probe, which is located on the outlet nipple of the boiler.
2. If the optional flow switch is present on the boiler, then the orange wire from the LWCO control box is left unconnected. If the optional
flow switch is not installed on or connected to the boiler, remove the wire connected to the low water cut-off probe on the boiler and
connect it to the orange wire from the newly mounted LWCO control box.
Содержание MODCON1000
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Страница 46: ...46 LP 428 REV 9 2 14 Figure 25 Figure 26 Cascade Resistor Plug Installation Detail ...
Страница 47: ...47 LP 428 REV 9 2 14 Figure 27 Mod Con Cascade Master and Follower Wiring ...
Страница 48: ...48 LP 428 REV 9 2 14 Figure 28 Mod Con Internal Connection Diagram LP 428 K ...
Страница 70: ...70 LP 428 REV 9 2 14 Figure 31 MOD CON 1000 External Parts Blowout ...
Страница 71: ...71 LP 428 REV 9 2 14 Figure 32 MOD CON 1700 External Parts Blowout ...
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