Heating Systems (Hastings Industries Inc.)

"I" SERIES INDOOR SYSTEM

The "I" series rooftop systems feature the package concept in commercial and industrial gas heating units. Hastings A.G.A. design certified type SD gas furnaces are incorporated into factory assembled, wired and testing heating systems. Three temperature control sequences are available to meet the requirements of most heating applications.

IHF-SPACE HEATING

(100% RETURN AIR)

Application and Operating Sequence

The IHF unit is designed for 100% return air room heating applications with the air temperature being controlled from the heated space. The IHF operating sequence is not recommended for ventilating applications.

The "On" position of the "On-Off-Auto" blower switch provides continuous blower operating. The "Auto" position allows blower operating whenever the room thermostat calls for heat. The room thermostat cycles the automatic gas valve to maintain the desired space air temperature.

RMU-MAKE UP AIR

(100% RETURN AIR)

The IMU make-up air unit is designed to replace exhausted building air with 100% outside air to prevent the many problems of "air starvation". This replacement air is heated when the outside air temperature is below the desired space air conditions.

The "On" position of the "On-Off" blower switch provides continuous blower operation. The "Winter" position of the "Summer-Off-Winter" season switch energizes the gas furnace(s). A modulating non-electric gas valve with bulb in the leaving air stream (and discharge air controller on 400 MBH furnaces) maintains a constant discharge air temperature. Standard discharge temperature range is 60° to 100° F adjustable.

With the "Summer-Off-Winter" season switch in the "Summer" position, gas furnace(s) is de-energized and blower operates to provide summer ventilation.

RHV-HEATING & VENTILATING

(MIXED OR 100% OUTSIDE AIR)

The IHV combines the control of both make-up air and space temperature. This sequence is equally effective for up to 100% of either outside or return air heating and ventilating application, or 100% of either outside or return air heating and ventilating applications, or 100% outside air only.

The "On" position of the "On-Off-Auto" blower switch provides continuous blower operation. The "Auto" position allows blower operation whenever the room thermostat calls for heat. The "Winter" position of the "Summer-Off-Winter" season switch energizes the gas furnace(s). On call for heat in the space, the room thermostat opens the by-pass gas valve to provide full gas input. If room thermostat is satisfied, the modulating non-electric gas valve (and discharge air controller on 400 MBH furnaces) maintains a constant discharge air temperature. Standard discharge temperature range is 60° to 100° F adjustable.

With the "Summer-Off-Winter" season switch in the "Summer" position, gas furnace(s) is de-energized and blower operates to provide summer ventilation.

Heating Systems - Page 11