NuAire B 07T/CO Series Installation Manual Download

Page: 46 / 52

30. 07. 20. Document Number 671760

Nuaire |

Western Industrial Estate

Caerphilly

CF83 1NA

nuaire.co.uk

BPS V-CO

Installation Manual

11.0 COMMISSIONING

Before commissioning the unit, ensure that all equipment has been
assembled in accordance with the installation procedure all instances
where the unit is in operation the access doors should remain closed; at
no time, during maintenance or otherwise, should anyone be inside a
unit whilst it is in operation.

11.1 Fan & Motor

Care should be taken to ensure that the fan and motor run freely and
that the fan is rotating in the correct direction.

The electrical current being drawn by motors should not exceed the
manufacturers recommendations (specified on the motor plate). If
the current exceeds this, check the fan volume flow rate and the static
resistance.

11.2 Commissioning Checklist

•

All equipment received is according to specification / order.

•

Any damage to unit identified.

•

Fan base shipping restraints / Fixing Brace removed (if
applicable).

•

Thermal wheel belt tensioned.

•

The correct installation procedure has been carried out in
accordance to Nuaire’s recommendations.

•

Anti-vibration mounts are adjusted accordingly.

•

Rotate fan impellers and motors to ensure they run freely.

•

Check any additional bearings and couplings (where fitted
manually).

•

Condensate drain traps are checked/connected.

•

Check all filters are correctly fitted.

•

Ensure ductwork is complete.

•

Check electrical supply voltage and tightness of all electrical
connections.

•

Ensure control damper operation.

•

Ensure access panels and doors are fitted properly and secure.

•

Check fan motor current draw.

12.0 FROST COIL INSTALLATION (OPTIONAL

ANCILLARY)

12.1 LPHW Frost Coil

LPHW frost coils are fitted with a frost stat on the air in side and an on/
off 230v valve actuator (Unit size 32 & 42 are NOT provided with valve
and actuator). If the frosts stat switches to a frost condition, the valve
actuator will open. The valve will open whether the fans are running
or not. This is for pipe freeze protection. The LPHW section requires its
own supply in order to power the valve actuator.

12.2 Wiring - LPHW Frost Coil Unit Sizes 07 - 42

External

Rotary

Isolator

LPHW Frost Heater Supply

(Overcurrent protection by others)

Recommended Frost

Temperature Setting 4°C

Heater Temperature

Setting

°C

-8

-2

Wiring - LPHW Frost Coil 07 - 42

12.3 Electric Heater Frost Coil

Electric heater frost coils are fitted with its own internal control panel.
The control is powered by a 400Vac 50Hz 3 phase & Neutral supply.
This must be isolated local to the unit and fitted with appropriate
overcurrent and fault protection. It connects to the main unit via “plug
and play” interconnecting looms. (See interconnection section for
details). No external connections are required. Electric heater elements
are protected by a fail-safe over-temperature switch which will
disconnect the heater supply if a temperature of 80°C is reached. Once
the elements cool, the switch will reset but a power cycle is required to
reset the heater supply contactor.

The frost coil is fitted with a burst fired controller with integral set
point, air off thermistor, air in frost stat, thermal cut-out and contactor.
The burst fired controller is only enabled if the frost stat reads a frost
condition, the over-temperature cut-out is healthy AND a 24vac fan
run signal is received from the main control panel. Once enabled the
burst fired controller will increase heating output to achieve the set
point set by the physical dial on the unit.

12.4 Wiring - Electric Heater Frost Coil Unit Sizes 07 - 22