KAH Operation & Maintenance Guide
Page: 33 of 88
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
SECTION 2 - START-UP & OPERATION (CONTINUED)
Starting The Electric Heater
Use the following instructions to start up the electrical
heater.
1. Check all electrical connections in the heater,
including both field and factory installed connections,
for tightness before operating the heater. After a short
period of operation, check all connections again for
tightness.
WARNING -
Rotating parts and electrical shock
hazards exist. Use the latest lock out/tag out
procedure to the fan motor(s) and heat power
disconnects before servicing. Failure to follow
proper safety precautions may result in serious
injury or death.
CAUTION -
DO NOT operate electric heat below
the minimum airflow requirement.
2. Visually inspect the heater elements prior to using the
heater. If physical damage is evident, use a Megohm
test to validate that the heater elements are safe to
use. If a less than 10 megohms is achieved, replace
any damaged elements or ceramic insulators prior to
operation.
3. Ensure filters are clean and airflow is at the minimum
requirement or greater, preferably 100 % airflow for
this start up procedure.
4. Make sure all associated control equipment is turned
on.
5. Energize main supply disconnect and set controlling
thermostat above ambient temperature.
6. This heater is equipped with automatic and manual
reset temperature limiting controls. If it fails to
operate, make sure the manual resets are operative
by pushing reset buttons.
FIGURE 30 - MINIMUM AIR VELOCITY REQUIRED FOR SAFE OPERATION
100
2
200 300 400 500 600 700 800 900 1000 1100 1200
4
6
8
10
12
14
16
0
0
100
2
200 300 400 500 600 700 800 900 1000 1100 1200
4
6
8
10
12
14
16
18
22
24
26
28
30
32
20
0
0
MINIMUM AIR VELOCITY REQUIRED
(FEET PER MINUTE)
KW
PER
SQ.
FT.
DUCT
AREA
KW
PER
SQ.
FT.
DUC
T
AR
EA
MINIMUM AIR VELOCITY REQUIRED
(FEET PER MINUTE)
R
FINNED
TUBULA
CONSTRUCTION
r
Belo
w
80°
Inlet
Ai
81
- 90°
Inlet
Air
91
- 100°
Inlet
Air
OPEN COIL
CONSTRUCTION
Note: Calculate KW per square foot of duct area as: (Heater Nameplate KW / Duct Area (sq.ft.)). See step 12 on previous page.