Section 10: Wiring; Positioning Thermostats; Low Voltage Thermostat With One Heater - Addison UHA 150 Installation, Operation & Service Manual

SECTION 10: WIRING

DANGER
Electrical Shock Hazard
Disconnect electric before service.
More than one disconnect switch may be
required to disconnect electric from
equipment.
Equipment must be properly grounded.
Failure to follow these instructions can result
in death or electrical shock.
All heater models require constant 120 V / 1Ø / 60
Hz power supply. Check heater rating plate for
electrical rating for proper circuit sizing. For
servicing, a disconnect switch of proper electrical
rating should be installed in the vicinity of the heater.
All heaters are equipped with thermostat
connections suitable to power a 24 V thermostat.

10.2 Low Voltage Thermostat with One Heater

Heater must be wired and electrically grounded in
accordance with local codes. In the absence of local
codes in accordance with: United States: refer to
National Electrical Code
Canada: refer to Canadian Electrical Code CSA
C22.1 Part I - latest revision.

10.1 Positioning Thermostats

A room thermostat should be mounted on a
vibration-free wall or column at a height of
approximately 5' (1.5 m) from the floor to measure
the ambient temperature. It should be clear of both
cold drafts and the direct path of warm air from the
heater.
Avoid mounting thermostat on outside walls or in
areas directly exposed to radiant heat or sunlight.
Install wall tag in a visible location near thermostat.
See Page 5, Section 2.1 for wall tag details.
10.1.1 Fan Control
The heater's axial fan can be used during the off-
season for air circulation. A low voltage
programmable thermostat with fan switch (P/N
90425400) must be used. See Page 21, Section
10.2 for thermostat connection details. For the use
of multiple heaters on one thermostat, See Page 22,
Section 10.3 through Page 23, Section 10.4.
24 Volt
Thermostat
Heating Only
Terminal
Strip
R
R
G
W
W
C
Electrical
Gas Supply
Supply
24 Volt
Thermostat
with Fan Control
Terminal
Strip
R
G
R
G
W W
C
C
Electrical
Gas Supply
Supply
SECTION 10: W
® NFPA 70 - latest revision
21 of 49
IRING