Greenheck MSX (470658) - Manual (Page 9)

9 Modular Supply Make-Up Air Unit
®
WARNING
Electrical Shock Hazard! Disconnect all power
sources before doing any work on the unit.
Effect of Low Voltage on Wattage and
British Thermal Unit (BTU)
The heating elements may be used on voltages
lower than the design voltage of the heater, however,
the wattage and BTU output will be reduced to the
percentages listed in the table below.
Installation of Electric Heater (optional)
The requirements and practices described below
are based on the National Electric Code (NEC) and
The Space Heating Standard of the Underwriters
Laboratories Inc. (UL). Although UL requirements
are uniform throughout the country, local electrical
codes may deviate from the National Electrical Code.
Therefore, local inspection authorities should be
consulted regarding local requirements.
Electrical Wiring Instructions
1. Use the wiring diagram supplied with the heater as
a guide in correlating field wiring with the heater
internal wiring.
2. All field wiring to the heater must meet the
requirements of the National Electric Code and any
other applicable local or state codes.
3. Wiring to the heater must be rated for 75°C (167°F)
minimum.
4. The fan is interlocked by the factory to the control
circuit so the electric heater will not operate unless
the fan is on.
5. If heater does not have a built-in disconnect switch
or main circuit breaker, install a remote disconnect
(furnished by others) in accordance with the National
Electric Code, Article 424-65.
Derated Wattage For Low Voltage
Heater
Voltage
Line
Voltage
% of
Heater
Wattage
and BTU
Heater
Voltage
Line
Voltage
% of
Heater
Wattage
and BTU
480 460 92 208 200 92
440 84 190 83
277 265 92 120 115 92
254 84 110 84
240 230 92
220 84
208 75
200 69