Desert Master™ 50TJM Single-Packaged Rooftop Electric Cooling Units

The 50TJM units are single side discharge rooftop cooling unit utilizing electric heat as an option. Units are prewired, pre-charged with R-410A refrigerant, and tested at the factory. These units can be placed on the side of a building or can be placed on a roof without roof curbs. Each unit is designed to occupy a minimal space. Piping and drain connections are readily accessible.

Installation Features
Single point electrical service entry
Side discharge application
No roof curb needed
Side by Side supply and return air
Separate panel for control box
Performance Features
HFC R-410A refrigerant
ASHRAE 90.1 Compliant
EER’s up to 11.5
TXV refrigerant metering device
Two independent refrigerant circuits, each with a scroll compressor
Low outdoor temperature cooling operation down to 40°F
Cooling operating range up to 125 °F (51.6°C)
Liquid filter drier standard on each circuit
Fresh air intake capability
Non-corrosive sloped condensate drain pan in accordance to ASHRAE 62 standard
Thermally protected and permanently lubricated condenser and evaporator fan motors
Angle type return air section with washable type filters
Environmentally Responsible Refrigerant Choice

R-410A refrigerant is:

A chlorine-free refrigerant from the HFC group
Has zero ozone depletion potential
Thermally efficient and provides high EER (energy efficiency), COP, and part load efficiencies
Superior Reliability, Efficiency and Safety
Exceptional endurance tests
Painted panels tested to ASTM B-117 500 hours salt spray protection
Pre-coated fin condenser coil for extra corrosion protection
Compressor Protection:
High and low pressure cutouts
Compressor lockout
Phase protection relay
Crankcase heaters are standard for all units
Internal over temperature protection
Freeze protection
Low vibration design:
Leak-tight refrigerant circuit
Brazed refrigerant connections for increased leak tightness
Low-noise scroll compressors with low vibration levels
Control circuit protected by circuit breaker
Thermally protected and permanently lubricated condenser and evaporator fan motors
Angle type return air section with washable type filters
Transformer for safe 24v control circuit supply included
State-of-art scroll compressor technology
Dual, electrically and mechanically independent refrigerant circuit
Double skin construction, Insulated cabinet
Standard Limited Warranty
5 years on compressors and 2 years parts on systems up to 25 tons
Extended warranty packages available
Factory-Installed Options
Refrigerant sight glass - Installed on each circuit
Pre-coated fins - condenser only
Copper fins - condenser only
Copper fins - condenser and evaporator
Field-Installed Options
Electric Heater Package: The electric heater package is factory supplied for field installed. Heater assemblies are provided with internal fusing for protection of heater circuits not exceeding 25 amps each. All power wiring leads are 8 AWG and control wiring are 18AWG, both rated at 105°c. Auto reset thermo limit controls, magnetic heater contractors (24v coil) and terminal block are mounted in electric heater control box attached to heater assembly.
UVC Ready: The unit shall be UVC ready for easy installation. UVC Lamp is field supplied and field installed.
Softbag Filters: Softbag filters are factory supplied and field installed. Softbag filters are in compliance of Eurovent EU7.