Lochinvar CF-CH(E)-i&s-08 Location, Freeze Protection, Pump Operation, Hydronic System Antifreeze

Installation and Service Manual

Base for Combustible Floors

There are no manufactured combustible floor base kits available for 990,000 - 2,070,000 Btu models. See Table-A below for floor base kits that are available.

You must construct a 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.

The value of ΔTMIN can be changed to a value between 1°F and 20°F. This will cause the unit to continue pump operation until the ΔT is less than the value selected (30 second minimum).

A value of “ON” is selectable through the control for ΔTMIN. This will operate the pump continuously. Alternatively, the pump can be powered by a separate circuit for continuous operation.

Note: Pump relay is rated for 1 HP maximum.

Location

Locate indoor boilers and hot water supply boilers in a room having a temperature safely above freezing [32°F (0°C)].

TABLE - A

COMBUSTIBLE FLOOR KITS

Input Btu/hr	Kit Number
	CFK3301
399,999
500,000	CFK3302
650,000	CFK3303
750,000	CFK3304

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.

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 35°F (2°C), the control turns on the pump contact and the alarm relay. The screen displays an error message (EO2).

Pump Operation

This unit is equipped with a pump delay feature as standard. The delay is selectable through the temperature controller. As shipped from the factory, the ΔTMIN is set to “OFF”, which creates a 30 second pump delay at the end of a Call for Heat.

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.

WARNING: Do not use antifreeze in domestic water heater applications.

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.

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