Chromalox PQ404-6 specifications Wiring

INSTALLATION (cont’d.)

SPECIAL INSTRUCTIONS FOR CUSTOMERS SUPPLYING THEIR OWN CONDENSATE OR PUMP SYSTEMS.

1.Check the voltage of the motor before making the wiring connec- tion. Some Chromalox boilers are supplied with dual voltage sys- tems. The motor should always match the voltage of the control circuit.

2.The motor circuit should be wired into the pump control as shown in wiring diagram.

3.A heavy-duty vacuum breaker is required when condensate system is used. (part number ES-89369)

Width – 6-1/2
1/2” Water Line		1” Discharge	to Boiler
	1/2” Solenoid
6-5/8”			5-7/8”
			4-1/4”
1/2” Strainer	3”	7-1/4”
	15-1/4” for CHS-150
	16-3/8” for CHS-180 to 300
Figure 4 – Motor and Pump Assembly

	L
1” Condensate		1” Vent
Return

1/2” Water Line

Strainers H

1” Outlet to Boiler

1” Drain

Motor and

Pump

“W” Dimension – Overall Width

Model	Max.	Tank Cap.
Number	PSI	(Gal.)	L	H	W
CHS-150
thru	125	33	33-1/4	41-1/2	21
CHS-300
CHS-360
thru	150	40	40	41-1/2	21
CHS-420
	Figure 5 – Condensate Return System

WIRING

1.Wiring to boiler should be as per appropriate wiring diagram sup- plied with boiler and in accordance with Local and National Electrical Codes.

2.SAFETY SWITCHES - Purchaser should use a safety switch between his main power source and the boiler. The safety switch should use circuit breakers or fuses and be in accordance with NEC and local codes.

Serious thought should be given to the advisability of using a shunt trip safety switch of the circuit breaker type as an additional safe- ty precaution. It is possible to utilize the spare contacts in the low

water cutoff to energize the shunt mechanism on the safety switch. This is an additional safety feature that prevents a dangerous situ- ation should a contactor or relay stick. Activation of the shunt trip device will completely disconnect the boiler from the power sup- ply. (See Figure 7).

3.Since boiler heating elements are susceptible to lightning damage, plants not having lightning arresters that have above-ground elec- trical cable supply sources should install lightning arresters in the proper size to meet the boiler kw load.

To Aux.			To L2 on
L.W. C.O.
		Operating	Terminal Strip
			Common
	Hi-Limit	Pressuretrols
	Pressuretrol

*Standard on CHS-150 to CHS-300 units in lieu of step sequencer and operating pressuretrol shown in Figure 8

	Shunt Trip Device
	(Supplied by Others)
Supply	To Field
	Wiring
Voltage	Input
	Terminal

To

L2

To Main

Switch L.W.C.O. &

Pump Control

To Motor Starter

To Aux.

L.W.C.O.

Figure 6 – Pressuretrol Control System*

Figure 7 – Safety Switch (Field Installed)

3