Loading ...
Loading ...
Loading ...
Part number 550-100-252/0520
– 39 –
Field wiring See wiring diagrams, Figure 21, page 30 & Figure 23, page 32 (continued)
C. 120 VAC to Boiler Circulator – REQUIRED
Terminal Strip EP7 (BOILER CIRC) (Expansion module, top right)
1. Provides 120VAC Dry Contact for boiler circulator.
2. Terminals are: 1 (H), 2 (H).
3. Maximum load: 10 amps (use relay if circulator load is higher).
4. Provide and install a fused disconnect or service switch (15-ampere rated
recommended) as required by applicable codes for circulator with maximum
load of 10 amps.
5. The boiler circulator is used in the boiler loop of the primary / secondary
piping. Primary / secondary piping is recommended to be used with the SVF
TM
boiler to ensure proper flow through the heat exchanger.
Other designed piping arrangements will work as long as water flow
requirements are met from pages 8 and page 9, contact your local
Weil-McLain commercial representative for assistance.
See Figure 21, page 30 for details.
D. 24 VAC Inputs 1, 2 and 3 (tstats, end switches, etc.) – As needed for systems
Terminal Strip P11 (input 1) & Terminal Strip P15 (inputs 2 & 3)
1. Input 1 – Terminal Strip P11 – 4 & 5 (SVF
TM
terminal bus).
2. Input 2 – Terminal Strip P15 – 1 & 2 (
SVF
TM
terminal bus).
3. Input 3 – Terminal Strip P15 – 3 & 4 (
SVF
TM
terminal bus).
4. These three inputs on each boiler can indicate a call for heat to the control
by means of a dry contact closure (thermostat, aqua
stat, or switch). (See
right and Figure 21, page 30).
5. The control provides inputs for up to three zones or three systems (priorities).
The control default setting is for three space heating zones tied to
PRIORITY 2, which is defaulted to FINNED TUBE BASEBOARD
system type.
6. For DHW applications, the aquastat can be connected to one of the three
input/output pairs. Take advantage of factory default settings by using PRI-
ORITY 1 for the DHW system. The default control setting for PRIORITY 1
is a direct-piped DHW system type.
7. The default control setting uses each input (INPUT 1, INPUT 2, and IN-
PUT 3) to control its respective 120VAC output (OUTPUT 1, OUTPUT 2, and
OUTPUT 3).
Use of 0–10VDC input for modulation disables Input 1 from creat-
ing calls for heat. See page 44 for instructions.
An input can be assigned to an AUX PUMP/OUTPUT function to
operate a system pump or interlock with a combustion air damper.
Inputs assigned for this function cannot be used for heat demand
operation. See page 65 and page 66 for more information on the
setup and selection of operating conditions.
See Figure 21, page 30 for details.
Thermostats — DO NOT supply 24-volt power to the thermostat
circuits (Input1, Input2 and Input3 in Figure 21, page 30) or at-
tempt to supply 24 volts for any other application.
For thermostats that require a continuous 24-volt power source,
connect the common wire (“C”) to
P11
Pin 2
(see Figure 21,
page 30)
.
Do NOT exceed 160mA draw per thermostat.
Zone valves — If using 3-wire zone valves, use
relays to provide dry contacts to the Control ther-
mostat connections. The zone valve end switches
of 3-wire valves carry 24VAC from the valve.
Thermostat anticipator setting — 0.1 amps.
SVF
™
Series 1
COMMERCIAL CONDENSING GAS-FIRED WAT ER BOILER
— Advanced Manual
Loading ...
Loading ...
Loading ...