Installation Manual

30
HE+ Series Infrared Gas Heater Installation and Operation Manual
Options For Thermostat Control:
NOTE: Fenwal DSI has an onboard relay switch to control the blower motor (120 Vac) and allows for
heater control with either 24V or 120V thermostat.
The Fenwal DSI has a post-purge feature.
A Thermostat MUST be installed in the heater’s thermostat circuit to enable the post-purge
feature of the ignition control.
TruTemp Thermostat (24Vac - 3-Wire)
True comfort control for radiant heating systems -
senses and averages ambient and radiant
temperatures.
Occupancy sensor with auto set-back of 9°F (5°C).
Do not use in wet or corrosive environments
903000059
Low Voltage Digital Thermostat
(24 Volts - °F or °C selectable)
Not for use in corrosive or wet environments
903000058
Multiple Heaters per 24V Thermostat
Relay Switch: One required for each burner after the
first burner in a zone (1st burner connects to 24V
thermostat)
Refer to wiring diagram Page 36
(field installed at or in burner)
NOTE: FENWAL DSI has built in relay for blower
operation
905000035
Line Voltage Control: (Interrupting power to burner disables post-purge feature of the Fenwal ignition control)
Line Voltage Thermostat:
Dual Scale: °F or °C
Not for use in corrosive or wet environments
903000057