Daikin DPSA, Manual

CAT 258 • REBEL APPLIED ROOFTOP 34 www.DaikinApplied.com

General Specification

F. 

Propeller Exhaust Fan 

1. 

Direct-drive axial exhaust fans shall be provided. 

Blades shall be constructed with fabricated steel 

and shall be securely attached to fan shafts. All 

exhaust fan assemblies shall be statically and 

dynamically balanced. Totally enclosed motors 

shall be permanently lubricated, heavy-duty type, 

carefully matched to the fan load. Ground and 

polished steel fan shafts shall be mounted in 

permanently lubricated and sealed ball bearings. 

Bearings shall be selected for a minimum (L10) 

life in excess of 100,000 hours at maximum 

cataloged operating speeds. 

2. 

The unit DDC controller shall provide building 

static pressure control. A factory mounted 

exhaust fan variable frequency drive shall 

provide proportional control of the exhaust fans 

from 25% to 100% of the scheduled exhaust air 

fan designed airflow and ESP. The field shall 

mount the required sensing tubing from the 

building to the factory mounted building static 

pressure sensor.

H.  ECM Exhaust Fan 

1. 

All fans shall be a single width, single inlet 

(SWSI) airfoil centrifugal fan. The fan wheel 

shall be Class II construction with aluminum 

fan blades that are continuously welded to the 

hub plate and end rim. The fan shall be a direct 

drive fan mounted to the motor shaft. Belts and 

sheaves are not acceptable due to the additional 

maintenance.

2. 

The fan motor shall be a totally enclosed 

electrically commutated motor that is speed 

controlled by the rooftop unit controller. The 

motor shall include thermal overload protection 

and protect the motor in the case of excessive 

motor temperatures. The motor shall have phase 

failure protection and prevent the motor from 

operation in the event of a loss of phase. Motors 

shall be premium efficiency. 

I. 

ECM Return Fans.

1. 

All fans shall be a single width, single inlet 

(SWSI) airfoil centrifugal fan. The fan wheel 

shall be Class II construction with aluminum 

fan blades that are continuously welded to the 

hub plate and end rim. The fan shall be a direct 

drive fan mounted to the motor shaft. Belts and 

sheaves are not acceptable due to the additional 

maintenance.

2. 

The fan motor shall be a totally enclosed 

electrically commutated motor that is speed 

controlled by the rooftop unit controller. The 

motor shall include thermal overload protection 

and protect the motor in the case of excessive 

motor temperatures. The motor shall have phase 

failure protection and prevent the motor from 

operation in the event of a loss of phase. Motors 

shall be premium efficiency. 

3. 

Exhaust Fan configurations are not allowed as 

alternate

2 .06 Electrical 

A. 

Unit wiring shall comply with NEC requirements 

and with all applicable UL standards. All electrical 

components shall be UL recognized where 

applicable. All wiring and electrical components 

provided with unit shall be number and color coded 

and labeled according to the electrical diagram 

provided for easy identification. 

B. 

The unit shall be provided with a factory wired 

weatherproof control panel. Unit shall have a power 

terminal block for main power connection. A terminal 

board shall be provided for low voltage control 

wiring. Branch circuit short circuit protection, 115 

volt control circuit transformer and fuse, system 

switches, and a high temperature sensor. Each 

compressor and condenser fan motor shall be 

furnished with contactors and inherent thermal 

overload protection. Supply and return fan motors 

shall have contactors and external overload 

protection. Knockouts shall be provided in the of the 

main control panels for field wiring entrance. 

C. 

All 115-600 volt internal and external wiring between 

control boxes and components shall be protected 

from damage by dedicated electrical raceways.

D. 

The receptacle shall be powered by a field supplied 

115V source.

E. 

The receptacle shall be powered by a factory 

supplied 115V transformer and will be available 

when the disconnect is in the OFF position.

F. 

Single non-fused disconnect swtich shall be 

provided for connecting electrical power at the unit. 

Disconnect switches shall be mounted internal to the 

control panel and operated by an externally mounted 

handle. 

G. 

Unit SCCR Rating to be 10 kAIC minimum

H.  Unit SCCR Rating to be 22 kAIC. minimum

I. 

Unit SCCR Rating to be 65 kAIC. minimum

J. 

Unit shall be provided with phase, voltage and 

brown out protection which shuts down all motors in 

the unit if the electrical phases are more than 10% 

out of balance on voltage or on phase reversal.

K. 

A dual non-fused disconnect switchs shall be 

provided for connecting two power sources to the 

unit. Each disconnect switch shall be mounted 

internal to the control panel and operated by an 

externally mounted handle. Circuit 1 shall have the 

compressors, condenser fan, and electric heat (if 

present); Circuit 2 shall have the supply, return, 

exhaust fans, controls, and gas heat if present.

L. 

Unit shall be provided with a safety shutdown 

terminal for installation of field emergency input.

M. 

All electrical options shall have a +/- 10 percent 

voltage utilization range to protect against voltage 

variation.