Raypak Raypak Delta Limited WH1-399B, Инструкция по установке и эксплуатации, Страница: 9 / 40

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NOTE: The minimum inlet water temperature to the
heater to prevent condensate is 105°F (40.5ºC) on heaters
with an efficiency of 85% or less, and 120°F (48.9ºC) on
86% efficiency heaters. Ensure that during operation the
Setpoint Pot is adjusted properly.
NOTE: If a “DIP” switch is provided on the control PCB,
verify that the switch settings are: 1 = OFF, 2 = ON, 3 =
OFF.
NOTE: The heater will lockout and shut down if the
setpoint on the inlet temperature is not achieved within
7-minutes from a call for heat.
Cold Start Sequence of Operation
1. 120VAC to heater sends 120VAC to Cold Start control
on terminal block 1.
2. 120/24VAC transformer and 120VAC-12VDC
converter are powered.
3. 120/24VAC transformer outputs 24VAC to pin 2 of
terminal block 2.
4. 24VAC leaves pin 2 of terminal block 2 and goes to
the modulating three-way valve on the 20-30VAC
lead, and to the NO contacts of the SPST relay
located in the cold start control panel.
5. 120VAC-12VDC converter outputs 12VDC to the
common terminal of the reset switch, located on the
bottom of the cold start control panel.
6. The 12VDC signal crosses over the reset switch and
goes to Terminal FS on the cold start circuit board.
7. Cold start control is now in standby until a Call for
Heat occurs at heater.
8. The heater outputs 24VAC to terminal 4 of terminal
block 3 located in Cold Start controller to indicate a
CFH from the heater.
9. Terminal 4 of TB 3 sends 24VAC to the coil of the
SPST relay located in the cold start control panel.
10. The SPST relay coil is energized and closes the
contacts allowing 24VAC to energize the CFH
terminal on the cold start circuit board.
a. A two-second delay occurs from the CFH signal
to the output of power from terminal MC of the
cold start circuit board.
11. 24VAC is sent from terminal 2 of terminal block 3 to
the NO contacts of the DPST relay located in the cold
start control panel.
12. After the two-second delay on the cold start circuit
board, pin MC outputs a 24VAC signal to the coil of
the DPST relay located in the cold start control panel.
13. The DPST relay coil energizes and closes the NO
contacts.
14. Once the NO contacts of the DPST close, the heater
24VAC is sent back to the heater to complete the
circuit (pin 3 of terminal block 3) and the interlock
circuit (pin 1 & 2 of terminal block 3) allowing the
heater to fire.
15. Pin FR on the TVC board outputs 10VDC to the
modulating three-way valve actuator to drive it fully
open for 2-minutes waiting for the heater to reach full
fire.
16. After the 2-minute delay the 10VDC output signal
from pin FR reduces to approximately 8VDC.
17. The output signal continues to vary depending on the
heater inlet temperature.
The DIP switches on the three-way valve actuator must be
set as indicated in Figure 11 below.
DIP SWITCH SETTINGS
FOR 3-WAY ACTUATOR
VDC
0-10
DA
FIXED
~
mA
2-10
RA
AUTO
6-9
SWITCH MUST BE IN THIS POSITION
TURN CLOCKWISE TO FURTHEST STOP
MODE SELECTION SWITCH
DIRECT ACTING, ON INCREASING SIGNAL
Figure 11. Set Dip Switch Settings - Actuator
NOTE:
THIS
SIDE
MUST
FACE
AWAY
FROM
VALVE
OPERATING
ROTATION DIRECTION
Figure 12. Actuator Shown in Full System Flow Position
CAUTION: For outdoor installations, the factory-
supplied weatherproof cover must be used.