Lochinvar 2 사용자 설명서

        

Installation & Operation Manual

1.  Route all low voltage wires through the knockouts in the 

rear of the boiler,  as shown in FIG. 7-2.

2.  Connect low voltage wiring to low voltage connection 

board as shown in FIG. 7-3 on page 38 of this manual and 
the boiler wiring diagram.

LINE VOLTAGE
J-BOX

LOW VOLTAGE
J-BOX

LOW VOLTAGE
WIRING KNOCKOUTS

LINE VOLTAGE
WIRING KNOCKOUTS

1.  Connect the room thermostat or boiler enable contacts 

(isolated contact only) to terminals 7 and 8, as shown in  
FIG. 7-3.

2.  If a thermostat is used, install the thermostat on the inside 

wall away from influences of drafts, hot or cold water 
pipes, lighting fixtures, television, sunlight, or fireplaces.

3.  Thermostat anticipator (if applicable):
 

a. 

If connected directly to boiler, set for 0.1 amps.

 

b.  If connected to relays or other devices, set to match 
  

total electrical power requirements of connected 

  

devices.  See device manufacturers’ specifications 

  

and thermostat instructions for details.

1.  Connect the outdoor temperature sensor (FIG. 7-3) to 

the Outdoor Sensor terminals on the connection board to 
enable outdoor reset operation of the Crest.  

2.  Mount the sensor on an exterior wall, shielded from direct 

sunlight or flow of heat or cooling from other sources.

3.  Route sensor wires through a knockout at the rear of the 

boiler (see FIG. 7-2).

If a variable speed pump is used in the primary loop, and 
a 0-10V signal is available from the pump speed control, 
this signal can be used by the SMART TOUCH control to 
anticipate changes in the building heat load.  By connecting 
this 0 - 10V signal to the 0 - 10V SYS PUMP IN terminals, the 
boiler (or cascade) can modulate up and down as the primary 
flow increases and decreases.

The RS-485 ModBus cable is connected to the ModBus 
terminals.  Use shielded, 2-wire twisted pair cable.  If desired, 
the shield can be connected to ground by installing a jumper 
wire between terminals 1 and 3 on connector X5 on the 
ModBus interface module.

1.  Connect the HWG tank thermostat to the Tank 

Thermostat  terminals  on  the  connection  board           
(FIG. 7-3).

1.  By installing a HWG tank sensor, the SMART TOUCH 

control can perform the tank thermostat function.  The 
SMART TOUCH control automatically detects the 
presence of this sensor, and generates a HWG call for heat 
when the tank temperature drops 6°F (3°C) below the 
tank set point, and finishes the call for heat when the tank 
temperature reaches the tank set point.

2.  A TST20015 sensor MUST be used with any indirect tank.  

Failure to use the correct sensor will result in the tank 
temperature being either above or below the set point.  
Connect the correct sensor to the Tank Sensor terminals 
(see FIG. 7-3).

If louvers need to operate before the boiler fires, they can be 
controlled by this output.  Connect these terminals to a 24V 
relay coil, which is wired to operate the louvers (FIG. 7-3).

Louvers are used to provide combustion air for the room air 
option.  A louver proving switch should be connected to the 
appropriate terminals and are verified prior to operation (see 
FIG. 7-3).

This 0 - 10V output is available to control the speed of a 
variable speed boiler pump.  The SMART TOUCH control will 
vary the speed of this pump in order to maintain a minimum 

T (set by the installer, see the Crest Service Manual) across 
the heat exchanger, as well as prevent high limit lockouts when 
the flow in the primary loop is extremely low.  Connect this 
output to the 0 - 10V input on the boiler pump speed control.

This output provides a 0 - 10V signal that is proportional to 
the firing rate of the boiler.  This may be used by a BMS system 
to monitor the actual rate of the boiler.

A system supply sensor must be installed 
for this feature to work.