SCOTSMAN WOOD FURNACE – INSTRUCTION MANUAL
Pressure may be corrected by the following measures:
1)Change blower pulley size (usually decrease)
2)Change blower motor pulley (usually increase)
3)Increase return air duct area (if restricted)
CAUTION – Current draw by blower motor should be checked after making any pulley change. If motor now draws greater current than that shown on the nameplate a larger more powerful motor must be installed.
IMPORTANT – DO NOT change the blower.
As an alternative to the static pressure test method, the installer may make adjustments on the basis of temperature measurement. For this test wood furnace must be at full operating temperature.
Take one temperature measurement in the front of the oil furnace plenum 12” to 16” up or approximately center. Take a second measurement in the wood furnace plenum (same position). Subtract one measurement from the other to arrive at a temperature difference (TD). The TD must be between 40º F and 100º F during normal operation, and ideally around 80º F. The same adjustment procedure for pulleys applies for correction when using this method.
CAUTION – Most thermometers have a large time lag in reaching accurate measuring levels. It is important that this interval be measured for your thermometer by immersing it in boiling water and observing the time required for it to reach correct reading.
IMPORTANT – This equipment shall be installed in accordance with the instructions of the manufacturer and in a manner acceptable to the regulatory authority by technicians experienced in such services. When required by the regulatory authority, such technicians shall be licensed to perform this service.
The installation shall comply with the applicable requirements of CSA standard B365, Installation Code for Solid Fuel Burning Appliances and Equipment, and if changes are made to the oil furnace this shall comply with CSA Standard B139, Installation Code for Oil Burning Equipment.
2.8Control System (Fig S101-5)
The fan and limit control and the damper motor should be located as shown in Figure S101 - 5.
The control system serves the following functions:
T822 – Room Thermostat – Wood Furnace
The primary control is the room thermostat located near the center of the house in the main floor or near an existing thermostat. The thermostat operates the damper motor to open and close the damper door thus allowing more or less air into the combustion area to control the fire.
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