12
34000 Autry Street, Livonia, MI 48150 | 800.968.5530 | Fax 734.419.0209 | www.hamiltonengineering.com | LIT91110 REV 06/2018
CONFIGURATION #7
Configuration #7 – CASCADE BOILERS WITH DOMESTIC HOT WATER PUMP
(Requires additional wiring harness – p/n WRE 74090 on the Lead boiler only)
• A room thermostat is to be connected to terminals 5 & 6 (or 13 & 14, 57 & 58 depending on model) of the
LEAD
BOILER ONLY
. If no yellow jumper wire is attached to 5 & 6 (or 13 & 14, 57 & 58 depending on model), which
will be removed to connect room thermostat, additional wiring is required. Consult local supplier.
• In this configuration an external sensor or aquastat MUST be connected to terminals 1 & 2 (or 3 & 4, 28 & 29
depending on model) on the
LEAD BOILER ONLY
to sense common loop temperature (after/at low loss header).
• The tank sensor or aquastat is to be connected to leads labeled “Tank Sensor” on the Lead boiler.
• The DHW pump is to be connected to the harness leads labeled “L and Close” in the Lead boiler, be sure and
cap the wire labeled “Open”.
• A flow check must be installed on the domestic hot water loop and the heating loop.
In this configuration the following can be done:
1. Adjust the boiler minimum and maximum temperature setting via the potentiometer located on the display
panel, within the range of 50 - 192°F.
(Parameter 2 EB, 2 EA )
2. Set boiler water temperature to the DHW tank. (
Factory default is 185°) (Parameter 2 CE)
3. Set the DHW water temperature
(Factory default is 140°F (must be less than 2CC)). (Parameter 2 LF)
4. Pump P3 can be controlled based on the Room Thermostat, wire to P3 leads.
Caution: Maximum available
wattage for external load on the FMT 914 control board is 550 watts. If pumps P1 & P3 total less, they
both can be powered directly off the board, if not a relay (240v coil) must be used for pump P3.
It is important to set the red potentiometer wheel to the desired setpoint on the Lag boilers with the power off to
the Lead boiler. This way, in the event of a control or power failure to the Lead boiler, the Lag boilers will operate
at the desired temperature.
BPD
8/11/09
1/2"=1'
Dwg. By:
34000 Autry
Livonia, MI 48150
PH: (800) 968-5530
Fax: (734) 419-0209
Description:
Date:
Scale:
Customer:
HAMILTON
ENGINEERING
Dwg.
No.:
Checked.
By:
Cascade Boiler
With External Sensor
Pumped Domestic Hot Water
Utilizing Full Cascade Output
Stainless
Indirect
Heater
Pump 1
Pump 1
Pump 1
Zone
Load
Pump 3
Low Loss Header
S3
(Cascade)
Outside Wall
S6
Outside Sensor
(Optional)
Lead
Lag 1
Lag 2
Room
Thermostat
Pump 2
0-10 VDC
(Optional)
Required parameter changes
from base program
Default
Change to
Base Program - HXXXKPCO.pia
All Boilers
1
0
All Lag Boilers - 2IA
0
1 - 7
