20
Cycle with compressor - In this configuration, the relay will be
ON any time the compressor relay is on.
Digital night setback (NSB) - In this configuration, the relay
will be ON if the NSB input is connected to ground C.
NOTE: If there are no relays configured for digital NSB, then
the NSB and OVR inputs are automatically configured for
mechanical operation.
Mechanical night setback - When NSB input is connected to
ground C, all thermostat inputs are ignored. A thermostat setback
heating call will then be connected to the OVR input. If OVR
input becomes active, then the Deluxe D control will enter night
low limit (NLL) staged heating mode. The NLL staged heating
mode will then provide heating during the NSB period.
5.6 - Water valve (slow opening)
If relay is configured for water valve (slow opening), the relay
will start 60 seconds prior to starting compressor relay.
5.7 - Outdoor air damper (OAD)
If relay is configured for OAD, the relay will normally be ON
any time the fan enable relay is energised. The relay will not
start for 30 minutes following a return to normal mode from
NSB, when NSB is no longer connected to ground C. After 30
minutes, the relay will start if the fan enable is set to ON.
CAUTION: To avoid equipment damage, DO NOT leave
system filled in a building without heat during the winter
unless anti-freeze is added to system water. Condenser coils
never fully drain by themselves and will freeze unless
winterised with anti-freeze.
6 - START-UP
Use the procedure outlined below to initiate proper unit start-up.
NOTE: This equipment is designed for indoor installation
only.
6.1 - Operating limits
Environment - This equipment is designed for indoor installation
ONLY. Extreme variations in temperature, humidity and corro-
sive water or air will adversely affect the unit performance,
reliability and service life.
Power supply - A voltage variation of
±
10% of nameplate
utilisation voltage is acceptable.
Unit starting conditions - Depending on the model, units start
and operate in an ambient temperature of 7.2
°
C with entering
air temperature at 4.4
°
C or 10
°
C, entering water temperature at
-6.7
°
C or 10
°
C and with both air and water at the flow rates used.
NOTE: These operating limits are not normal or continuous
operating conditions. Assume that such a start-up is for the
purpose of bringing the building space up to occupancy
temperature. See Table 7 for operating limits.
WARNING: When the disconnect switch is closed, high
voltage is present in some areas of the electrical panel. Exercise
caution when working with the energised equipment.
1.
Restore power to system.
2.
Turn thermostat fan position to ON. Blower should start.
3.
Balance air flow at registers.
4.
Adjust all valves to the full open position and turn on the
line power to all heat pump units.
5.
Operate unit in the cooling cycle. Refer to Table 7 for unit
operating limits.
NOTE: Three factors determine the operating limits of a unit:
(1) entering air temperature, (2) water temperature and (3)
ambient temperature. Whenever any of these factors are at a
minimum or maximum level, the other two factors must be at
a normal level to ensure proper unit operation (see Table 7).
Table 7 - Operating limits - 50RHE units
Air limits
Cooling
°
C
Heating
°
C
Min. ambient air temperature
7.2
7.2
Rated ambient air temperature
26.7
21.1
Max. ambient air temperature
37.8
29.4
Min. entering air temperature
10
4.4
Rated entering air temperature db/wb
27/19
20/15
Max. entering air temperature db/wb
43.3/28.3
27
Water limits
Cooling
°
C
Heating
°
C
Min. entering water temperature
-1.1
-6.7
Normal entering water temperature
10 to 32
-1.1 to 15.6
Legend
db - dry bulb
wb - wet bulb
Note: Value in heating column is dry bulb only. Any wet bulb reading is acceptable.
