4: Separate pre- and post- filter transducer and magnehelic
gauge
5: Combined pre- and post- filter magnehelic gauge
6: Separate pre- and post- filter magnehelic gauge
7: Combined pre- and post- filter transducer, separate pre-
and post- filter magnehelic gauge
Digit 15: Supply fan
A: Direct drive plenum (DDP) supply fan with 1 in. spring
isolation
B: DDP supply fan with 2 in. spring isolation
C: DDP supply fan with 2 in. spring isolation and seismic
restraint
D: Dual direct drive plenum supply fans with 1 in. spring
isolation
E: Dual direct drive plenum supply fans with 2 in. spring
isolation
F: Dual direct drive plenum supply fans with 2 in. spring
isolation and seismic restraint
Digit 16: Supply fan motor horsepower
A: 5 HP / 5 HP x 2
B: 7.5 HP / 7.5 HP x 2
C: 10 HP / 10 HP x 2
D: 15 HP / 15 HP x 2
E: 20 HP / 20 HP x 2
F: 25 HP / 25 HP x 2
G: 30 HP / 30HP x 2
H: 40 HP
J: 50 HP
Digit 17: Supply fan motor type
2: ODP premium efficiency 1,800 RPM
4: TEFC premium efficiency 1,800 RPM
Digit 18: Supply fan options
0: None
1: Inlet guard
2: Airflow measurement station
3: Shaft grounding ring
4: Inlet guard and airflow measurement station
5: Inlet guard and shaft grounding ring
6: Airflow measurement station and shaft grounding ring
7: Shaft Grounding Ring, Inlet Guard and Airflow
Measurement Station
Digits 19: Building pressure control
0: None
1: Barometric damper
2: Exhaust with VFD and backdraft damper
3: Modulating damper (on/off exhaust fan only without
VFD)
4: Modulating damper (return fan only with VFD)
Digit 20: Return/exhaust fan
A: None
B: Exhaust fan with 1 in. spring isolation
C: Exhaust fan with 2 in. spring isolation
D: Exhaust fan with 2 in. spring isolation and seismic
restraint
E: Return fan with 1 in. spring isolation
F: Return fan with 2 in. spring isolation
G: Return fan with 2 in. spring isolation and seismic
restraint
H: DDP return fan with 1 in. spring isolation
J: DDP return fan with 2 in. spring isolation
K: DDP return fan, fan with 2 in. spring isolation and seismic
restraint
Digit 21: Return/exhaust fan motor horsepower
A: None
E: 3 HP
F: 5 HP
G: 7.5 HP
H: 10 HP
J: 15 HP
K: 20 HP
L: 25 HP
M: 30 HP
N: 40 HP
Digit 22: Return/exhaust fan motor type
0: None
1: ODP premium efficiency 1,200 RPM
2: ODP premium efficiency 1,800 RPM
3: TEFC premium efficiency 1,200 RPM*
4: TEFC premium efficiency 1,800 RPM*
Digit 23: Return/exhaust fan options
A: None
B: Shaft grounding ring
C: Extended grease lines
D: Extended grease lines and shaft grounding ring
E: Belt guards*
F: Belt guards and shaft grounding ring*
G: Return fan airflow measurement station
H: Return fan airflow measurement station and shaft
grounding ring
J: Extended grease lines and belt guards*
K: Extended grease lines and belt guards and shaft
grounding ring*
L: Extended grease lines and return fan airflow
measurement station
M: Extended grease lines and return fan airflow
measurement station and shaft grounding
N: Belt guards and return fan airflow measurement station
P: Belt guards and return fan airflow measurement station
and shaft grounding ring
Q: Extended grease lines and belt guards and return fan
airflow measurement station
R: Extended grease lines and belt guards and return fan
airflow measurement station and shaft grounding ring
R: Extended Grease Lines and Belt Guards and Return Fan
Airflow Measurement Station and Shaft Grounding Ring
Digits 24: Return/exhaust fan drive
A: None (25-50 ton)
0: None (60-80 ton)
1-9: RPM
A-Z: RPM
Digit 25: Evaporator options
G: Aluminum fin evaporator with SST drain pan
H: Aluminum fin evaporator with SST drain pan with
condensate overflow switch
J: E-Coat aluminum fin evaporator with SST drain pan*
K: E-Coat aluminum fin evaporator with SST drain pan with
condensate overflow switch*
L: Copper fin evaporator with sst drain pan*
M: Copper fin evaporator with SST drain pan with
condensate overflow switch*
Digit 26: Condenser coil options
2: With wire guards
3: Full louvered panels*
4: Partial louvered panels with wire guards*
6: E-Coat condenser with wire guards*
7: E-Coat condenser, full louvered panels*
8: E-Coat condenser, partial louvered panels with wire
guards*
Digit 27: Draw-through filter options
A: Angled filter rack, no filters
B: Angled filter rack, 2 in. throwaway filters
C: Angled filter rack, 2 in. MERV 8 filters
D: Rigid filter rack, no filters
E: Rigid filter rack, MERV 15 bag filters with 2 in. MERV 8
pre-filters
F: Rigid filter rack, MERV 14 rigid filters with 2 in. MERV 8
pre-filters
G: Vertical filter rack, no filters
H: Vertical filter rack, 4 in. MERV 8 filters
Digit 28: Draw-through filter control options
0: None
1: Combined pre- and post- filter transducer
2: Separate pre- and post- filter transducer
3: Combined pre- and post- filter transducer and combined
magnehelic gauge
4: Separate pre- and post- filter transducer and magnehelic
gauge
5: Combined pre- and post- filter magnehelic gauge
6: Separate pre- and post- filter magnehelic gauge
7: Combined pre- and post- filter transducer, separate pre-
and post- filter magnehelic gauge
Digit 29: Economizer options
A: None
C: Dry bulb economizer, low leak dampers
D: Single enthalpy economizer, low leak dampers
E: Dual enthalpy economizer, low leak dampers
F: Dry bulb economizer, low leak dampers with airflow
measurement station
G: Single enthalpy economizer, low leak dampers with
airflow measurement station
H: Dual enthalpy economizer, low leak dampers with
airflow measurement station
K: Dry bulb economizer, ultra low leak dampers
L: Single enthalpy economizer, ultra low leak dampers
S: Dual enthalpy economizer, ultra low leak dampers
T: Dry bulb economizer, ultra low leak dampers with airflow
measurement station
U: Single enthalpy economizer, ultra low leak dampers with
airflow measurement station
V: Dual enthalpy economizer, ultra low leak dampers with
airflow measurement station
Digit 30: Energy recovery options
0: None
1: Low cubic feet per minute (CFM) energy recovery wheel
(ERW) without VFD*
2: Low CFM ERW with VFD*
3: High CFM ERW without VFD*
4: High CFM ERW with VFD*
Tempmaster
®
Omni™ Premier 25 Ton to 80 Ton Rooftop Units Installation and Maintenance Guide
7
Tempmaster
