Hydronic Heating - Raypak Xfiire 300B Installation And Operation Manual

NPT FITTING
THERMAL PASTE
4 PIPE DIA
NOT TO EXCEED
12 IN. (305 mm)
SYSTEM
PIPING
F10501
TO BOILER
Figure 14. System Sensor Installation on Primary/
Secondary Systems
COMMON
PIPING
F10500
BOILER 1
OUTLET
Figure 15. System Sensor Installation on Cascade Primary
Systems

Hydronic Heating

Pump Selection
The heater is designed for up to 80ºF (27ºC) ΔT and
continuous return temperatures from 40°F to 190°F (4.4°C
to 88°C).
NOTE: Higher return temperatures may limit the firing
rate when the maximum water temperature of 200°F
(93°C) is approached.
DRYWELL
SYSTEM
SENSOR
5 FT. (1.5 M)
MAX
NOT TO SCALE
FROM BOILER
5 FT. (1.5 M)
MAX.
NOT TO SCALE
BOILER 2
OUTLET
Flow Values GPM (lpm)
M
ODEL
Max Flow**
300B 38
400B 50
500B 62
650B 80
800B 90
1000B 90
* Minimum flow based on H O as heating media. Medias other than
2
H O may require higher minimum flow rates.
2
** Maximum flow based on 10° ΔT or 10.5 feet per second velocity,
whichever is less.
Table J. Flow Rate
NOTE: For systems using glycol, see Table K below for
necessary pumping requirements.
Ethylene Glycol Concentration (%)
PARAMETER
CORRECTION
0
Capacity Factor
1.000
Multiplier
GPM Correction
1.000
Multiplier
See Glycol section on on page 44.
Table K. Glycol Correction Factors (Requires Optional
Flow Meter)
Feedwater Regulator
Raypak recommends that a feedwater regulator be in-
stalled and set at 12 psi (8.3 kPa) minimum pressure at
the highest point of the system. Install a check valve or
back flow device upstream of the regulator, with a manual
shut-off valve as required by local codes.
Piping
All high points should be vented. This heater, when
used in connection with a refrigeration system, must be
installed so that the chilled medium is piped in parallel with
the heater with appropriate valves to prevent the chilled
medium from entering the heater. The piping system of a
hot water heater connected to heating coils located in air-
handling units where they may be exposed to circulating
refrigerated air, must be equipped with flow-control valves
or other automatic means to prevent gravity circulation
of the heater water during the cooling cycle. It is highly
recommended that the piping be insulated.
Min. Flow*
Min. Flow*
@100%
15 15
20 15
24 15
32 16
39 19
48 24
25 30 40
0.972 0.960 0.928 0.878
1.040 1.055 1.100 1.150
50
15