Weil-McLain 2 Series Manual page 53

®
SlimFit Series 2
Field wiring
C.
1. Provides 120 VAC 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 recom-
mended) 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 pip-
ing. Primary / secondary piping is recommended to be used with the SlimFit
boiler to ensure proper flow through the heat exchanger.
Other designed piping arrangements will work as long as water flow
requirements are met from page 15, contact your local Weil-McLain
commercial representative for assistance.
D.
1. Input 1 – Terminal Strip P11 – 4 & 5 (SlimFit terminal bus).
2. Input 2 – Terminal Strip P15 – 1 & 2 (SlimFit terminal bus).
3. Input 3 – Terminal Strip P15 – 3 & 4 (SlimFit 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, aquastat, or switch). (See right and
Figure 52, page 48).
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 PRIORITY 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 INPUT 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 creating
calls for heat. See page 58 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 71 and page 72 for more information on the setup and selection of
operating conditions.
circuits (Input1, Input2 and Input3 in Figure 52, page 48) or attempt
to supply 24 volts for any other application.
For thermostats that require a continuous 24-volt power source, con-
nect the common wire ("C") to
Do NOT exceed total amp draw per thermostat.
Part number 550-100-180/0917
COMMERCIAL CONDENSING GAS
(see
–
REQUIRED
(Expansion module, top right)
— supply 24-volt power to the thermostat
DO NOT
Pin 2 (see Figure 52, page 48).
- — Boiler Manual
FIRED WATER BOILER
(continued)
See Figure 52, page 48 for details
–
As needed for systems
See Figure 52, page 48 for details
— If using 3-wire zone valves, use relays
to provide dry contacts to the Control thermostat con-
nections. The zone valve end switches of 3-wire valves
carry 24 VAC from the valve.
— 0.1 amps.
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