Installation and Service Manual
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 | Kit Number |
| CFK3302 |
495,000 | |
645,000 | CFK3303 |
745,000 | CFK3304 |
|
|
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
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.
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.
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 instructions. Do not use undiluted or automotive type antifreeze.
Outdoor Boiler Installation
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 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).
5.Drain pump and piping.
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)].
Figure 3 - Draining Unit
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