9
34000 Autry Street, Livonia, MI 48150 | 800.968.5530 | Fax 734.419.0209 | www.hamiltonengineering.com | LIT91110 REV 06/2018
CONFIGURATION #4
Configuration #4 – CASCADE BOILERS (NO DOMESTIC HOT WATER)
• In this configuration an external sensor MUST be connected to terminals 1 & 2 (or 3 & 4, 28 & 29 depending
on model) on the
LEAD BOILER ONLY
and be positioned to sense common loop temperature (after/at low
loss header).
• 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 terminals 5 & 6 (or 13 & 14, 57 & 58 depending
on model), which will be removed to connect room thermostat, additional wiring is required. Consult factory.
In this configuration the following can be done:
1. Adjust the boiler minimum and maximum temperature setting via the potentiometer, within the range of
50 - 192°F
(Parameter 2 EB, 2 EA)
2. Pump P3 can be controlled based on the Room Thermostat, must add heating harness WRE74090 and
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
8/10/09
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:
Pump 1
Pump 1
Pump 1
Zone
Load
Pump 3
Low Loss Header
S3
(Cascade)
Lead
Lag 1
Lag 2
0-10 VDC
(Optional)
Room
Thermostat
Outside Wall
S6
Outside Sensor
(Optional)
Cascade Boiler
With External Sensor
No Domestic Hot Water
Required parameter changes
from base program
Default
Change to
Base Program - HXXXKPCO.pia
All Lag Heaters - 2CA
5
2
All Lag Heaters - 2IA
0
1 - 7
