Installation Manual

31
HE+ Series Infrared Gas Heater Installation and Operation Manual
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.
A line voltage thermostat will disable the post-purge feature
2-Stage Low Voltage Digital Thermostat
(24 Volts - °F or °C selectable)
Not for use in corrosive or wet environments
903000065
Moisture Proof NEMA 4X - 2-Stage Thermostat -
DPDT Line Voltage
40° - 110°F (5° - 40°C)
Both °F & °C Scales
Voltage: 24 - 277 Vac
Differential: 3°F
Stainless Steel Bulb
UL Listed
903000062
Modulating Low Voltage Thermostat - ZonePRO
Temperature Control — Microprocessor-optimized PIA
Temperature Setting — Manual — ˚C or ˚F
Dimensions (HxWxD) — 2.7 x 4.6 x 1.0 in
Setpoint Range — 50˚ F to 95˚ F (10˚ C to 35˚ C)
Temperature Display — 32˚ F to 140˚ F (0˚ C to 60˚ C)
Auto Changeover Deadband — 9˚ F (5˚ C)
Mode Hysteresis — 4˚ F (2˚ C)
903000066