Thermo Pride CLHS1-050P36N Installation And Operation Manual page 32

All installations and services must be performed by qualified service personnel.
a. A separate power supply circuit with over current protection and a disconnect switch must be provided. See
furnace specifications or furnace rating label for maximum fuse size.
b. All CLHS1 and CLHX1 Series furnaces are supplied with a fuse disconnect switch box to be mounted on the
outside surface of the right or left side casing so a fuse disconnect can be mounted on the furnace. Make the 120
volt supply connection in this junction box. A green screw and a strain relief are provided in order to connect the
power supply ground wire and provide strain relief for the 120 volt power leads from the furnace in the fuse
disconnect box. A disconnect switch can be field mounted on the 2x4 box provided. If not, the disconnect switch
must be located reasonably close to and within sight of the furnace.
NOTICE: The hot surface igniter and operation of this furnace depends on correct polarity. The hot leg of the
supply circuit must be connected to the black line lead and the common leg to the white line lead in the field
mounted junction box. The hot leg must pass through the disconnect switch in all cases to prevent the hazard of
electrical shock when servicing.
IMPORTANT: The furnace must be grounded in accordance with local codes and with the National Electrical Code
(ANSI/NFPA NO. 70 or latest edition).
2. Electronica Air Cleaner (EAC) and Humidifier Installation
The ignition module on this furnace has designated terminals to control the operation of an electronic air cleaner
and/or humidifier. These terminals provide line voltage (1.0 Amp @ 120VAC) for the control of these accessories
(See Figures 13 & 14). The Humidifier is energized whenever the combustion inducer motor is energized. The EAC
is energized whenever the circulation blower motor is energized for heating or cooling, but not for continuous fan.
NOTICE: It is important to confirm that the operating voltage of the humidifier or EAC being installed matches the
output of this control. If not, a field supplied relay or transformer may be necessary to provide the proper control and
supply voltage for the accessory being installed. See the manufacturer's instructions for the humidifier or EAC for
additional instructions.
3. Thermostat Anticipator Setting
When using an analog thermostat, proper control of the indoor temperature can only be achieved if the thermostat is
calibrated to the heating and/or cooling cycle. A vital consideration of this calibration is related to the thermostat
heat anticipator. Newer digital thermostats do not have an Anticipator Setting and do not require calibration.
The proper thermostat heat anticipator setting is 0.4 Amps for furnace operation only. To increase length of cycle,
increase setting of heat scale; to decrease length of cycle, decrease setting of heat scale. Anticipators for the cooling
operation are generally pre-set by the thermostat manufacturer and require no adjustment. Anticipators for the
heating operation are of two types, pre-set and adjustable. Those that are pre-set will not have an adjustment scale
and are generally marked accordingly.
32