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base for combustible floor installation. Install unit over a base
of hollow clay tiles or concrete blocks from 8" to 12" thick and
extending at least 24" beyond the unit sides. Place tiles or
blocks so that the holes line up horizontally to provide a clear
passage through the tiles or blocks. Place a 1/2" fireproof
millboard over the top of the tile or block base. Place a 20-
gauge sheet metal cover over the fireproof millboard. Center
the unit on the base. Also follow this procedure if electrical
conduit runs through the floor beneath the unit. This base must
meet all local fire and safety codes.
TABLE - A
COMBUSTIBLE FLOOR KITS
Input Btu/hr
495,000
645,000
745,000
FREEZE PROTECTION
Although these units are CSA International design certified for
outdoor installations, such installations are not recommended
in areas where the danger of freezing exists. You must provide
proper freeze protection for outdoor installations, units
installed in unheated mechanical rooms or where temperatures
may drop to the freezing point or lower. If freeze protection is
not provided for the system, a low ambient temperature alarm
is recommended for the mechanical room. Damage to the unit
by freezing is non-warrantable.
Anytime the temperature measured at any of the sensors
(except the outside air temperature sensor) drops below 40°F,
the control turns on the pump contact and the alarm relay. The
pump will shut off when both sensors are above 50°F.
Pump Operation
This unit is equipped with a pump delay of 30 seconds. If
continuous operation of the pump is desired, the pump must be
electrically connected to another circuit. Connection of the
pump to this unit will provide intermittent pump delay
operation.
Location
Locate indoor boilers and hot water supply boilers in a room
having a temperature safely above freezing [32°F (0°C)].
Hydronic System Antifreeze
Freeze protection for a heating boiler or hot water supply
boiler using an indirect coil can be provided by using hydronic
system antifreeze. Follow the appliance manufacturers
Kit Number
instructions. Do not use undiluted or automotive type
antifreeze.
CFK3302
CFK3303
Outdoor Boiler Installation
CFK3304
Adequate hydronic system antifreeze must be used. A snow
screen should be installed to prevent snow and ice
accumulation around the unit or its venting system.
Shut-Down and Draining
If for any reason, the unit is to be shut off, the following
precautionary measures must be taken:
1. Shut off gas supply.
2. Shut off water supply.
3. Shut off electrical supply
4. Drain the unit completely. Remove one threaded plug or
5. Drain pump and piping.
Figure 3 - Draining Unit
7
Installation and
Service Manual
CAUTION: A mechanical room operating
under a negative pressure may experience a
down draft in the flue of a boiler which is not
firing. The cold outside air pulled down the flue
may freeze a heat exchanger. This condition
must be corrected to provide adequate freeze
protection.
bulbwell from the inlet side of the front header and one
from the outlet side of the front header on the heat
exchanger. Blow all water out of the heat exchanger (see
Figure 3).
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