Cold Water Start-Multiple Boiler; Materials Included; Installation; Mounting The Control Boxes - Rheem Raypak Hi Delta 302C Installation And Operation Manual

4. COLD WATER START-
MULTIPLE BOILER
(Maximum 4 Boilers)

Materials Included

• 1 Cold Start Control Box
• 1 Multi-Boiler Interlock Box
• 1 Water Sensor & Well
• 1 Three-way Diverting Valve assembly with Actuator
NOTE: Flanges, bolts and gaskets for flanged valves
supplied by others.

Installation

Mounting the Control Boxes

Cold Start Control and Multi-Boiler Interlock should be
mounted in such a manner as to allow for easy access for
wiring of the boiler interlock connections.

Installing the Temperature Sensor

Temperature sensor to be installed in a drywell with thermal
paste at the location indicated in the diagram on page 21
to ensure proper operation of the control system. Installer
must ensure the drywell extends at least 2 inches into the
water flow path. Sensor wiring must be run in separate
conduit from line voltage and should be a minimum of 18
AWG shielded cable. Refer to "Wiring Diagram" on page
19 for wiring information.

Installing the Three-way Valve

Install three-way diverting valve into common boiler piping
manifold as shown in the diagram on page 18. Boiler
common outlets to be connected at port AB. Discharge to
system from port A with bypass port being port B. Common
pipe sizing may be larger than three-way valve port
connections requiring the use of increasers for installation
(see Table B for valve sizing). It is recommended that three-
Total Load
Valve Size
(MBTU)
600-1000 2" NPT
1001-1800 2.5" NPT
1801-2600 2.5" NPT
2601-4000 4" FLG*
4001-6000 4" FLG*
6001-8000 4" FLG*
Standard boiler pump options offered by Raypak may NOT be appropriate for these applications.
*CAUTION: Approved for closed-loop systems only.
16
Minimum
Flow Rate
Pipe Size Cv
GPM (lpm)
in. (mm)
2 (51) 57 70 (265)
2.5 (63) 74 100 (379)
3 (76) 100 150 (568)
4 (102) 152 220 (833)
4 (102) 254 330 (1249)
6 (152) 327 440 (1666)
Table B.
way valve be installed as near the main system piping as
is feasible. Route control wiring in separate conduit to the
Cold Water Start control box and wire as shown in the
diagram on page 19.

Connecting Power to the Controller

Installer to provide a dedicated 120V circuit with local
disconnect to the Cold Water Start Control. Refer to wiring
Figure 9 for detailed instruction.
Connecting the CWS Control to the
Multi-Boiler Interlock Box
Installer to provide four 18AWG stranded wires between
pins 7-10 on the Cold Start Control and 7-10 on the Multi-
Boiler Interlock as shown in "Wiring Diagram" on page
19. Do not use solid-core wire when wiring any portion
of the Cold Start Multi-Boiler system.
Connecting the Boiler to the CWS
Multi-Boiler Interlock
Installer to provide five 18AWG stranded wires between
each boiler and Multi-Boiler Interlock box. Wiring to be
run in separate conduit from line voltage to ensure proper
operation. Refer to "Wiring Diagram" on page 19 for
connection points depending on Raypak product being
used.
Connecting the Actuator
The 4-inch valve is shipped loose, and must be field wired.
Connect the actuator leads to the Cold Water Start control
panel, as indicated in the wiring diagram on page 14.
The actuator for the 4" valves rotates opposite to the
direction of the smaller actuators.

Actuator to Valve Orientation

Install the actuator so that the tail is pointing horizontally
as shown in "Valve Orientation (Actuator)" on page 17 is
pointing down. DO NOT mount it so that the tail is pointing
Valve
Pressure Drop
Ft. hd. (kPa)
3.5 (10.5)
4.2 (12.6)
5.2 (15.5)
4.8 (14.3)
3.9 (11.7)
4.2 (12.2)
Valve Sizing Chart
∆T @ Max ∆T @ Min.
Size Size
ºF (ºC) ºF (ºC)
22 (12.2) 14.4 (8.0)
30.2 (16.8) 16.8 (9.3)
29.1 (16.2) 20.1 (11.2)
30.5 (17.1) 22.9 12.7)
30.5 (17.1) 20.3 (11.3)
30.5 (17.1) 22.5 (12.5)
Order No.
012228
012229
012230
012231
012232
012233