TW2000 WOOD-FIRED BOILER – INSTRUCTION MANUAL
2.5Clearances
The KERR TW2000 Wood-Fired Boiler is to be installed in accordance with the National Building Code or local regulations. Allowances front and rear must be made for cleaning and servicing.
Minimum safety clearances to combustibles are: | | |
Front | 48” | 1220 mm |
One Side | 6” | 152 mm |
Other Side (for rear access) | 24” | 610 mm |
Rear | 24” | 610 mm |
Above Wood-Fired Boiler | 24” | 610 mm |
Flue Pipe to combustible, Boiler & electrical wiring | 18” | 457 mm |
Floor | Non-Combustible |
These clearances will also allow adequate combustion air to reach the boiler.
2.6Plumbing Connections
There are only two differences between the installation of any conventional hot water heating system and those using a Kerr TW2000 boiler – the safety override zone valve, and the blow-down extinguishing system. A circulator of at least 5-G.P.M. capacity must be used in a system using the Kerr TW2000 boiler to assure circulation of water.
The normally open zone valve must be installed to allow a free flow of water in a power off situation. Kerr recommends that the valve be placed as shown in Fig. TW-1 or Fig. TW- 4. The override zone valve should be on the loop supplying the living area on the main floor level (i.e. kitchen – living room). The override loop for the safety shall have at least 30 ft. of radiation above the wood boiler. Do not use basement loop for the safety override loop, as this will not provide gravity flow in a power out situation. This override loop must be capable of dissipating at least 10% of the estimated heat output of the Kerr TW2000 boiler in the event that the circulation is reduced because of electrical power failure. The safety by- pass dump zone shall NOT run through any plastic piping. A deliberate manual action shall be required to make the override loop inoperative.
The blow-down extinguishing system is installed to control the fire in case overheating causes excessive pressure in the pressure vessel. The relief valve, included, is threaded into the top of the pressure vessel and copper pipe is installed from its exhaust to the flange above the loading door on the firebox.
In addition to its ability to heat the home, this boiler is provided with a domestic coil position. A copper coil may be purchased with your boiler or added at a later date. It may be utilized as a single water heater or in conjunction with an oil, gas or electric heater.
