Camus Hydronics DRH300, Инструкция по установке, эксплуатации и обслуживанию

Страница: 26 / 87

20
To select the proper pump it is strongly recommended to
consider the following:
•
Need to know the required flow (GPM) and pressure drop
for your appliance (see Table 8 and 9)
•
Type of application: hydronic heating or domestic hot
water (DHW).
•
For hydronic heating and DHW applications with normal
water hardness choose a pump which will result in a
temperature rise across the main heat exchanger of 10ºF
to 25 ºF (5.5ºC-13.8ºC) depending on the size of the
heater. If necessary use a flow setter valve to achieve the
desired temperature rise.
•
For DHW applications with other than normal water
hardness choose a pump for the local water hardness
conditions. Alternatively run the pump continuously and
soften the water to normal levels. Damage to the heat
exchanger as a result of scaling or corrosive water
conditions is non-warrantable.
NOTE
The use of a system sensor is required in lead lag operation.
1) When variable speed main circulators ARE NOT used the
system sensor is to be placed into the return system
piping.
2) When variable speed main circulators are used the system
sensor is to be placed into the supply system piping.
4.12
∆
T HEAT EXCHANGER ALGORITHM
The Dynaforce® is constantly monitoring the inlet and outlet
water temperatures on the Dynaforce®, when the
∆ T
approaches 40
o
F the burner will modulate down, and when this
temperature is exceeded the gas valve will de-energize to
prevent overheating the heat exchanger.
PART 5 ELECTRICAL &
CONTROLS
IT IS EXTREMELY IMPORTANT THAT THIS UNIT BE
PROPERLY GROUNDED!
5.1 ELECTRICAL CONECTIONS
Table 10: Minimum Power Requirements
Model
Voltage
Requirement
Maximum Over
Current
Protection
Full Load
Amps
[Amperes] [Amperes]
300 -
1000
120VAC, 60Hz 20 < 12.0
1200 -
2000
120VAC, 60Hz 20 14.0
2500 120VAC, 60Hz 30 18.0
3000 -
3500
208/230VAC,
60Hz*
30 20.0
4000 -
5000
208/230VAC,
60Hz, 3 Phase**
30 18.0
*This is a 4-wire power supply requiring two (2) lives, a
neutral and a ground
**This is a 5-wire power supply requiring three (3) lives, a
neutral and a ground
Dynaforce® boilers supplied at 460/3/60 voltage, differ
from the standard unit per the following:
CAUTION!
While working with 460V circuits it is imperative that extra
precautions be taken
- Ensure that lock-out/ tag-out procedures are strictly
enforced
- Only properly trained and authorized personnel should
be permitted to work on live electrical circuits
- All electrical workers should be trained in electrical
rescue techniques and CPR
Each unit has an internal factory mounted 500VA
transformer to supply the 115V necessary for the ignition
circuit. For the incoming power, a 3-wire connection, is
made at the rear junction box. A new variable frequency
drive replaces the standard VFD, and the combustion
blower fan has been configured to operate at 460/3/60V
(using the standard fan). Part numbers as well as FLA
and MOCP information is below.
500VA transformer: DC0500UH
VFD: Model Range:
T234 DR-1200 to DR-1800 (1hp)
T235 DR-2000 to DR-2500(1.5hp)
T237 DR-3000 to DR-3500 (3hp)
T238 DR-4000 to DR-5000 (5hp)