Roof Top Units
HA / 34 /45 /52 /61 / 75 / 89 / 110 RC
Roof Top Unit
14
3. ELECTRICAL
3.1 Set Points
(a)
(a) Set point of compressor overload relay.
(b)
(b) Set point of indoor fan motor overload relay.
NOTE: The outdoor fan motor is fitted with an internal automatic reset overload device.
3.2 Operating voltage: Recheck voltage at unit supply terminals.
3.3 Control
(a)
Operate system switches and control thermostat.
(b)
Check unit is wired for correct control of unit fan, cooling and heating functions.
3.4 General:
(a)
With unit switched off at main isolater check:
(b)
All terminals right.
COMMISSIONING
( CONTINUED)
(c)
Wiring clear of or protected from pipework and sharp edges.
4. FINAL CHECK
4.1 Schraeder valve caps in place and secure.
4.2 All panels and fan guards in place and secure.
4.3 Unit clean and free of excess installation material.
REGULAR MAINTENANCE
These units have been designed for minimum maintenance through the use of permanently lubricated components.
However, there are operational maintenance requirements that require regular attention to ensure optimum perfor-
mance.
Maintenance must be performed by appropriately experienced personnel.
WARNING:
Isolate unit from power supply before working on unit.
1. REMOVAL OF PANELS
All access panels are removable by unscrewing the self tapping retaining screws.
2. FILTER CLEANING
The filters are provided and fitted by the installer and consequently specifications will vary with personal prefer-
ence. For normal air conditioning duty the common filter is either a 25 mm or 50 mm thick permanent type which
may be cleaned with the aid of a vacuum cleaner then washed in a weak solution of detergent and warm water.
However, the installers recommendation should be sought to ascertain the method and frequency of cleaning best
suited to the type used and the needs of the particular installation.
3. FAN DRIVE SYSTEM (Indoor)
Fan shaft and motor bearings are of permanently lubricated, sealed type and require no regular maintenance other
than a check on their general condition. The fan belt tension should be checked regularly and belt surfaces in-
spected for cracks or excessive wear. The belt should be tensioned to give a 20 mrn deflection under medium
pressure with the thumb on one of the straight runs.
4. OUTDOOR COIL
The coil surface will become laden with dust and maybe blocked by leaves or papers over a period of time. The
surface should be inspected periodically and cleaned down by hosing or steam cleaning as required.
5. ELECTRICAL
The contact surfaces of relays and contactors should be inspected regularly by an electrician and replaced as
judged necessary. On these occasions the control box should be blown out with compressed air to remove any
accumulation of dust or other contaminants.
6. REFRIGERATION
The refrigeration system is hermetically sealed and should require no regular maintenance. However, it is recom-
mended that the system be leak tested and the general operating and control systems be checked on a regular
basis. The operating pressures should be checked particularly at these times as they are an excellent guide to
other areas of the system in need of maintenance.
MAINTENANCE
